feat(task-logs): add board task activity and task log stream

docs/iterations/README.md

@@ -10,10 +10,11 @@
 - [Итерация 04 — Messaging + Review](./iteration-04-messaging-review.md)
 - [Итерация 05 — Testing + Polish](./iteration-05-testing-polish.md)
 - [Итерация 06 — Team Provisioning (Create Team из UI)](./iteration-06-team-provisioning.md)
+- [Iteration 07 - Task Logs + Explicit Board Task Links](./iteration-07-task-logs-explicit-board-task-links.md)
+- [Iteration 08 - Exact Task Logs Reusing Existing Execution Renderer](./iteration-08-exact-task-logs-reuse-existing-renderer.md)
 
 ## Принципы
 
 - **Vertical slice**: в каждой итерации доводим минимум “end-to-end” (types → main → IPC → preload → renderer → UI)
 - **Чёткий scope**: у каждой итерации есть цели и не‑цели
 - **Definition of Done**: заранее фиксируем критерии готовности и ручную проверку
-

docs/iterations/schemas/board-task-transcript-v1.schema.json

@@ -0,0 +1,192 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "$id": "https://claude-team.local/schemas/board-task-transcript-v1.schema.json",
+  "title": "Board Task Transcript V1",
+  "type": "object",
+  "properties": {
+    "uuid": {
+      "type": "string",
+      "minLength": 1
+    },
+    "timestamp": {
+      "type": "string",
+      "minLength": 1
+    },
+    "sessionId": {
+      "type": "string",
+      "minLength": 1
+    },
+    "boardTaskLinks": {
+      "type": "array",
+      "items": {
+        "$ref": "#/$defs/boardTaskLink"
+      }
+    },
+    "boardTaskToolActions": {
+      "type": "array",
+      "items": {
+        "$ref": "#/$defs/boardTaskToolAction"
+      }
+    }
+  },
+  "$defs": {
+    "boardTaskLocator": {
+      "type": "object",
+      "required": ["ref", "refKind"],
+      "properties": {
+        "ref": {
+          "type": "string",
+          "minLength": 1
+        },
+        "refKind": {
+          "type": "string",
+          "enum": ["canonical", "display", "unknown"]
+        },
+        "canonicalId": {
+          "type": "string",
+          "minLength": 1
+        }
+      },
+      "additionalProperties": false
+    },
+    "actorContext": {
+      "type": "object",
+      "required": ["relation"],
+      "properties": {
+        "relation": {
+          "type": "string",
+          "enum": ["same_task", "other_active_task", "idle", "ambiguous"]
+        },
+        "activeTask": {
+          "$ref": "#/$defs/boardTaskLocator"
+        },
+        "activePhase": {
+          "type": "string",
+          "enum": ["work", "review"]
+        },
+        "activeExecutionSeq": {
+          "type": "number"
+        }
+      },
+      "allOf": [
+        {
+          "if": {
+            "properties": {
+              "relation": {
+                "enum": ["same_task", "idle", "ambiguous"]
+              }
+            },
+            "required": ["relation"]
+          },
+          "then": {
+            "not": {
+              "anyOf": [
+                { "required": ["activeTask"] },
+                { "required": ["activePhase"] },
+                { "required": ["activeExecutionSeq"] }
+              ]
+            }
+          }
+        }
+      ],
+      "additionalProperties": false
+    },
+    "boardTaskLink": {
+      "type": "object",
+      "required": ["schemaVersion", "task", "targetRole", "linkKind", "actorContext"],
+      "properties": {
+        "schemaVersion": {
+          "const": 1
+        },
+        "toolUseId": {
+          "type": "string",
+          "minLength": 1
+        },
+        "task": {
+          "$ref": "#/$defs/boardTaskLocator"
+        },
+        "targetRole": {
+          "type": "string",
+          "enum": ["subject", "related"]
+        },
+        "linkKind": {
+          "type": "string",
+          "enum": ["execution", "lifecycle", "board_action"]
+        },
+        "taskArgumentSlot": {
+          "type": "string",
+          "enum": ["taskId", "targetId"]
+        },
+        "actorContext": {
+          "$ref": "#/$defs/actorContext"
+        }
+      },
+      "allOf": [
+        {
+          "if": {
+            "properties": {
+              "linkKind": {
+                "const": "execution"
+              }
+            },
+            "required": ["linkKind"]
+          },
+          "then": {
+            "not": {
+              "anyOf": [
+                { "required": ["taskArgumentSlot"] }
+              ]
+            }
+          }
+        }
+      ],
+      "additionalProperties": false
+    },
+    "boardTaskToolAction": {
+      "type": "object",
+      "required": ["schemaVersion", "toolUseId", "canonicalToolName"],
+      "properties": {
+        "schemaVersion": {
+          "const": 1
+        },
+        "toolUseId": {
+          "type": "string",
+          "minLength": 1
+        },
+        "canonicalToolName": {
+          "type": "string",
+          "minLength": 1
+        },
+        "input": {
+          "type": "object",
+          "properties": {
+            "status": {
+              "type": "string",
+              "enum": ["pending", "in_progress", "completed", "deleted"]
+            },
+            "owner": { "type": ["string", "null"] },
+            "clarification": { "type": ["string", "null"], "enum": ["lead", "user", null] },
+            "reviewer": { "type": "string" },
+            "relationship": {
+              "type": "string",
+              "enum": ["blocked-by", "blocks", "related"]
+            },
+            "commentId": { "type": "string" }
+          },
+          "additionalProperties": false
+        },
+        "resultRefs": {
+          "type": "object",
+          "properties": {
+            "commentId": { "type": "string" },
+            "attachmentId": { "type": "string" },
+            "filename": { "type": "string" }
+          },
+          "additionalProperties": false
+        }
+      },
+      "additionalProperties": false
+    }
+  },
+  "additionalProperties": true
+}

scripts/diagnose-task-log-stream.ts

@@ -0,0 +1,92 @@
+import { BoardTaskLogDiagnosticsService } from '../src/main/services/team/taskLogs/diagnostics/BoardTaskLogDiagnosticsService';
+
+function usage(): string {
+  return 'Usage: pnpm exec tsx scripts/diagnose-task-log-stream.ts <team-name> <task-id-or-display-id> [--json]';
+}
+
+function formatExamples(
+  title: string,
+  examples: Array<{
+    timestamp: string;
+    toolName: string;
+    toolUseId?: string;
+    filePath: string;
+    messageUuid: string;
+    isSidechain: boolean;
+    agentId?: string;
+  }>,
+): string[] {
+  if (examples.length === 0) {
+    return [];
+  }
+
+  return [
+    title,
+    ...examples.map((example) => {
+      const parts = [
+        `- ${example.timestamp}`,
+        example.toolName,
+        `message=${example.messageUuid}`,
+        `file=${example.filePath}`,
+        `sidechain=${String(example.isSidechain)}`,
+      ];
+      if (example.toolUseId) {
+        parts.push(`toolUseId=${example.toolUseId}`);
+      }
+      if (example.agentId) {
+        parts.push(`agentId=${example.agentId}`);
+      }
+      return parts.join('  ');
+    }),
+  ];
+}
+
+async function main(): Promise<void> {
+  const teamName = process.argv[2];
+  const taskRef = process.argv[3];
+  const jsonMode = process.argv.includes('--json');
+
+  if (!teamName || !taskRef) {
+    console.error(usage());
+    process.exitCode = 1;
+    return;
+  }
+
+  const diagnosticsService = new BoardTaskLogDiagnosticsService();
+  const report = await diagnosticsService.diagnose(teamName, taskRef);
+
+  if (jsonMode) {
+    console.log(JSON.stringify(report, null, 2));
+    return;
+  }
+
+  const lines = [
+    `Task log diagnostics for ${report.teamName} #${report.task.displayId}`,
+    `Task: ${report.task.subject}`,
+    `Status: ${report.task.status}${report.task.owner ? `  owner=${report.task.owner}` : ''}`,
+    `Transcript files: ${report.transcript.fileCount}`,
+    `Explicit records: total=${report.explicitRecords.total} execution=${report.explicitRecords.execution} lifecycle=${report.explicitRecords.lifecycle} boardAction=${report.explicitRecords.boardAction}`,
+    `Explicit participants: ${report.explicitRecords.participants.join(', ') || 'none'}`,
+    `Explicit tool names: ${report.explicitRecords.toolNames.join(', ') || 'none'}`,
+    `Interval tool results: total=${report.intervalToolResults.total} boardMcp=${report.intervalToolResults.boardMcp} worker=${report.intervalToolResults.worker.total} explicitWorker=${report.intervalToolResults.worker.explicitLinked} missingWorker=${report.intervalToolResults.worker.missingExplicit}`,
+    `Stream: participants=${report.stream.participants.join(', ') || 'none'} defaultFilter=${report.stream.defaultFilter} segments=${report.stream.segmentCount}`,
+    `Visible stream tools: ${report.stream.visibleToolNames.join(', ') || 'none'}`,
+    'Diagnosis:',
+    ...report.diagnosis.map((line) => `- ${line}`),
+    ...formatExamples(
+      'Missing worker tool results without explicit links:',
+      report.intervalToolResults.worker.examples,
+    ),
+    ...formatExamples(
+      'Empty payload examples from current stream:',
+      report.stream.emptyPayloadExamples,
+    ),
+  ];
+
+  console.log(lines.join('\n'));
+}
+
+main().catch((error) => {
+  console.error(String(error));
+  process.exitCode = 1;
+});

src/main/ipc/handlers.ts

@@ -90,6 +90,10 @@ import { registerWindowHandlers, removeWindowHandlers } from './window';
 
 import type {
   BranchStatusService,
+  BoardTaskActivityService,
+  BoardTaskLogStreamService,
+  BoardTaskExactLogDetailService,
+  BoardTaskExactLogsService,
   ChangeExtractorService,
   CliInstallerService,
   FileContentResolver,
@@ -130,6 +134,10 @@ export function initializeIpcHandlers(
   teamProvisioningService: TeamProvisioningService,
   teamMemberLogsFinder: TeamMemberLogsFinder,
   memberStatsComputer: MemberStatsComputer,
+  boardTaskActivityService: BoardTaskActivityService,
+  boardTaskLogStreamService: BoardTaskLogStreamService,
+  boardTaskExactLogsService: BoardTaskExactLogsService,
+  boardTaskExactLogDetailService: BoardTaskExactLogDetailService,
   teammateToolTracker: TeammateToolTracker | undefined,
   branchStatusService: BranchStatusService | undefined,
   contextCallbacks: {
@@ -174,7 +182,11 @@ export function initializeIpcHandlers(
     memberStatsComputer,
     teamBackupService,
     teammateToolTracker,
-    branchStatusService
+    branchStatusService,
+    boardTaskActivityService,
+    boardTaskLogStreamService,
+    boardTaskExactLogsService,
+    boardTaskExactLogDetailService
   );
   initializeConfigHandlers({
     onClaudeRootPathUpdated: contextCallbacks.onClaudeRootPathUpdated,

src/main/ipc/teams.ts

@@ -21,10 +21,14 @@ import {
   TEAM_GET_CLAUDE_LOGS,
   TEAM_GET_DATA,
   TEAM_GET_DELETED_TASKS,
-  TEAM_GET_MESSAGES_PAGE,
   TEAM_GET_LOGS_FOR_TASK,
+  TEAM_GET_TASK_ACTIVITY,
+  TEAM_GET_TASK_LOG_STREAM,
+  TEAM_GET_TASK_EXACT_LOG_DETAIL,
+  TEAM_GET_TASK_EXACT_LOG_SUMMARIES,
   TEAM_GET_MEMBER_LOGS,
   TEAM_GET_MEMBER_STATS,
+  TEAM_GET_MESSAGES_PAGE,
   TEAM_GET_PROJECT_BRANCH,
   TEAM_GET_SAVED_REQUEST,
   TEAM_GET_TASK_ATTACHMENT,
@@ -98,15 +102,15 @@ import {
   buildActionModeAgentBlock,
   isAgentActionMode,
 } from '../services/team/actionModeInstructions';
+import {
+  buildReplaceMembersDiff,
+  buildReplaceMembersSummaryMessage,
+} from '../services/team/memberUpdateNotifications';
 import { TeamAttachmentStore } from '../services/team/TeamAttachmentStore';
 import { TeamMembersMetaStore } from '../services/team/TeamMembersMetaStore';
 import { TeamMetaStore } from '../services/team/TeamMetaStore';
 import { buildAddMemberSpawnMessage } from '../services/team/TeamProvisioningService';
 import { TeamTaskAttachmentStore } from '../services/team/TeamTaskAttachmentStore';
-import {
-  buildReplaceMembersDiff,
-  buildReplaceMembersSummaryMessage,
-} from '../services/team/memberUpdateNotifications';
 
 import {
   validateFromField,
@@ -118,6 +122,10 @@ import {
 
 import type {
   BranchStatusService,
+  BoardTaskActivityService,
+  BoardTaskLogStreamService,
+  BoardTaskExactLogDetailService,
+  BoardTaskExactLogsService,
   MemberStatsComputer,
   TeamDataService,
   TeammateToolTracker,
@@ -131,6 +139,10 @@ import type {
   AttachmentFileData,
   AttachmentMeta,
   AttachmentPayload,
+  BoardTaskActivityEntry,
+  BoardTaskLogStreamResponse,
+  BoardTaskExactLogDetailResult,
+  BoardTaskExactLogSummariesResponse,
   CreateTaskRequest,
   EffortLevel,
   GlobalTask,
@@ -143,6 +155,7 @@ import type {
   MemberLogSummary,
   MemberSpawnStatusEntry,
   MemberSpawnStatusesSnapshot,
+  MessagesPage,
   SendMessageRequest,
   SendMessageResult,
   TaskAttachmentMeta,
@@ -155,7 +168,6 @@ import type {
   TeamCreateRequest,
   TeamCreateResponse,
   TeamData,
-  MessagesPage,
   TeamLaunchRequest,
   TeamLaunchResponse,
   TeamMessageNotificationData,
@@ -184,7 +196,7 @@ const SEEN_RATE_LIMIT_KEYS_MAX = 500;
 async function getDurableLeadTeammateRoster(
   teamName: string,
   leadName: string
-): Promise<Array<{ name: string; role?: string }>> {
+): Promise<{ name: string; role?: string }[]> {
   const normalize = (name: string | undefined | null): string => name?.trim().toLowerCase() ?? '';
   const leadLower = normalize(leadName);
   const reserved = new Set(['team-lead', 'user', leadLower].filter((value) => value.length > 0));
@@ -241,7 +253,7 @@ async function getDurableLeadTeammateRoster(
 function buildLeadRosterContextBlock(
   teamName: string,
   leadName: string,
-  teammates: Array<{ name: string; role?: string }>
+  teammates: { name: string; role?: string }[]
 ): string | null {
   if (teammates.length === 0) return null;
 
@@ -377,6 +389,10 @@ let memberStatsComputer: MemberStatsComputer | null = null;
 let teamBackupService: TeamBackupService | null = null;
 let teammateToolTracker: TeammateToolTracker | null = null;
 let branchStatusService: BranchStatusService | null = null;
+let boardTaskActivityService: BoardTaskActivityService | null = null;
+let boardTaskLogStreamService: BoardTaskLogStreamService | null = null;
+let boardTaskExactLogsService: BoardTaskExactLogsService | null = null;
+let boardTaskExactLogDetailService: BoardTaskExactLogDetailService | null = null;
 
 const attachmentStore = new TeamAttachmentStore();
 const taskAttachmentStore = new TeamTaskAttachmentStore();
@@ -407,7 +423,11 @@ export function initializeTeamHandlers(
   statsComputer?: MemberStatsComputer,
   backupService?: TeamBackupService,
   toolTracker?: TeammateToolTracker,
-  branchTracker?: BranchStatusService
+  branchTracker?: BranchStatusService,
+  taskActivityService?: BoardTaskActivityService,
+  taskLogStreamService?: BoardTaskLogStreamService,
+  taskExactLogsService?: BoardTaskExactLogsService,
+  taskExactLogDetailService?: BoardTaskExactLogDetailService
 ): void {
   teamDataService = service;
   teamProvisioningService = provisioningService;
@@ -416,6 +436,10 @@ export function initializeTeamHandlers(
   teamBackupService = backupService ?? null;
   teammateToolTracker = toolTracker ?? null;
   branchStatusService = branchTracker ?? null;
+  boardTaskActivityService = taskActivityService ?? null;
+  boardTaskLogStreamService = taskLogStreamService ?? null;
+  boardTaskExactLogsService = taskExactLogsService ?? null;
+  boardTaskExactLogDetailService = taskExactLogDetailService ?? null;
 }
 
 export function registerTeamHandlers(ipcMain: IpcMain): void {
@@ -450,6 +474,10 @@ export function registerTeamHandlers(ipcMain: IpcMain): void {
   ipcMain.handle(TEAM_CREATE_CONFIG, handleCreateConfig);
   ipcMain.handle(TEAM_GET_MEMBER_LOGS, handleGetMemberLogs);
   ipcMain.handle(TEAM_GET_LOGS_FOR_TASK, handleGetLogsForTask);
+  ipcMain.handle(TEAM_GET_TASK_ACTIVITY, handleGetTaskActivity);
+  ipcMain.handle(TEAM_GET_TASK_LOG_STREAM, handleGetTaskLogStream);
+  ipcMain.handle(TEAM_GET_TASK_EXACT_LOG_SUMMARIES, handleGetTaskExactLogSummaries);
+  ipcMain.handle(TEAM_GET_TASK_EXACT_LOG_DETAIL, handleGetTaskExactLogDetail);
   ipcMain.handle(TEAM_GET_MEMBER_STATS, handleGetMemberStats);
   ipcMain.handle(TEAM_UPDATE_CONFIG, handleUpdateConfig);
   ipcMain.handle(TEAM_START_TASK, handleStartTask);
@@ -517,6 +545,10 @@ export function removeTeamHandlers(ipcMain: IpcMain): void {
   ipcMain.removeHandler(TEAM_CREATE_CONFIG);
   ipcMain.removeHandler(TEAM_GET_MEMBER_LOGS);
   ipcMain.removeHandler(TEAM_GET_LOGS_FOR_TASK);
+  ipcMain.removeHandler(TEAM_GET_TASK_ACTIVITY);
+  ipcMain.removeHandler(TEAM_GET_TASK_LOG_STREAM);
+  ipcMain.removeHandler(TEAM_GET_TASK_EXACT_LOG_SUMMARIES);
+  ipcMain.removeHandler(TEAM_GET_TASK_EXACT_LOG_DETAIL);
   ipcMain.removeHandler(TEAM_GET_MEMBER_STATS);
   ipcMain.removeHandler(TEAM_UPDATE_CONFIG);
   ipcMain.removeHandler(TEAM_START_TASK);
@@ -579,6 +611,34 @@ function getBranchStatusService(): BranchStatusService {
   return branchStatusService;
 }
 
+function getBoardTaskActivityService(): BoardTaskActivityService {
+  if (!boardTaskActivityService) {
+    throw new Error('Board task activity service is not initialized');
+  }
+  return boardTaskActivityService;
+}
+
+function getBoardTaskLogStreamService(): BoardTaskLogStreamService {
+  if (!boardTaskLogStreamService) {
+    throw new Error('Board task log stream service is not initialized');
+  }
+  return boardTaskLogStreamService;
+}
+
+function getBoardTaskExactLogsService(): BoardTaskExactLogsService {
+  if (!boardTaskExactLogsService) {
+    throw new Error('Board task exact logs service is not initialized');
+  }
+  return boardTaskExactLogsService;
+}
+
+function getBoardTaskExactLogDetailService(): BoardTaskExactLogDetailService {
+  if (!boardTaskExactLogDetailService) {
+    throw new Error('Board task exact log detail service is not initialized');
+  }
+  return boardTaskExactLogDetailService;
+}
+
 async function wrapTeamHandler<T>(
   operation: string,
   handler: () => Promise<T>
@@ -1371,7 +1431,7 @@ async function handlePrepareProvisioning(
 ): Promise<IpcResult<TeamProvisioningPrepareResult>> {
   let validatedCwd: string | undefined;
   let validatedProviderId: TeamLaunchRequest['providerId'];
-  let validatedProviderIds: Array<'anthropic' | 'codex' | 'gemini'> | undefined;
+  let validatedProviderIds: ('anthropic' | 'codex' | 'gemini')[] | undefined;
   if (cwd !== undefined) {
     if (typeof cwd !== 'string' || cwd.trim().length === 0) {
       return { success: false, error: 'cwd must be a non-empty string' };
@@ -1391,7 +1451,7 @@ async function handlePrepareProvisioning(
     if (!Array.isArray(providerIds)) {
       return { success: false, error: 'providerIds must be an array when provided' };
     }
-    const normalized: Array<'anthropic' | 'codex' | 'gemini'> = [];
+    const normalized: ('anthropic' | 'codex' | 'gemini')[] = [];
     for (const entry of providerIds) {
       if (entry !== 'anthropic' && entry !== 'codex' && entry !== 'gemini') {
         return { success: false, error: 'providerIds entries must be anthropic, codex, or gemini' };
@@ -2440,6 +2500,94 @@ async function handleGetLogsForTask(
   );
 }
 
+async function handleGetTaskActivity(
+  _event: IpcMainInvokeEvent,
+  teamName: unknown,
+  taskId: unknown
+): Promise<IpcResult<BoardTaskActivityEntry[]>> {
+  const vTeam = validateTeamName(teamName);
+  if (!vTeam.valid) {
+    return { success: false, error: vTeam.error ?? 'Invalid teamName' };
+  }
+  const vTask = validateTaskId(taskId);
+  if (!vTask.valid) {
+    return { success: false, error: vTask.error ?? 'Invalid taskId' };
+  }
+  return wrapTeamHandler('getTaskActivity', () =>
+    getBoardTaskActivityService().getTaskActivity(vTeam.value!, vTask.value!)
+  );
+}
+
+async function handleGetTaskLogStream(
+  _event: IpcMainInvokeEvent,
+  teamName: unknown,
+  taskId: unknown
+): Promise<IpcResult<BoardTaskLogStreamResponse>> {
+  const vTeam = validateTeamName(teamName);
+  if (!vTeam.valid) {
+    return { success: false, error: vTeam.error ?? 'Invalid teamName' };
+  }
+  const vTask = validateTaskId(taskId);
+  if (!vTask.valid) {
+    return { success: false, error: vTask.error ?? 'Invalid taskId' };
+  }
+  return wrapTeamHandler('getTaskLogStream', () =>
+    getBoardTaskLogStreamService().getTaskLogStream(vTeam.value!, vTask.value!)
+  );
+}
+
+async function handleGetTaskExactLogSummaries(
+  _event: IpcMainInvokeEvent,
+  teamName: unknown,
+  taskId: unknown
+): Promise<IpcResult<BoardTaskExactLogSummariesResponse>> {
+  const vTeam = validateTeamName(teamName);
+  if (!vTeam.valid) {
+    return { success: false, error: vTeam.error ?? 'Invalid teamName' };
+  }
+  const vTask = validateTaskId(taskId);
+  if (!vTask.valid) {
+    return { success: false, error: vTask.error ?? 'Invalid taskId' };
+  }
+  return wrapTeamHandler('getTaskExactLogSummaries', () =>
+    getBoardTaskExactLogsService().getTaskExactLogSummaries(vTeam.value!, vTask.value!)
+  );
+}
+
+async function handleGetTaskExactLogDetail(
+  _event: IpcMainInvokeEvent,
+  teamName: unknown,
+  taskId: unknown,
+  exactLogId: unknown,
+  expectedSourceGeneration: unknown
+): Promise<IpcResult<BoardTaskExactLogDetailResult>> {
+  const vTeam = validateTeamName(teamName);
+  if (!vTeam.valid) {
+    return { success: false, error: vTeam.error ?? 'Invalid teamName' };
+  }
+  const vTask = validateTaskId(taskId);
+  if (!vTask.valid) {
+    return { success: false, error: vTask.error ?? 'Invalid taskId' };
+  }
+  if (typeof exactLogId !== 'string' || exactLogId.trim().length === 0) {
+    return { success: false, error: 'exactLogId must be a non-empty string' };
+  }
+  if (
+    typeof expectedSourceGeneration !== 'string' ||
+    expectedSourceGeneration.trim().length === 0
+  ) {
+    return { success: false, error: 'expectedSourceGeneration must be a non-empty string' };
+  }
+  return wrapTeamHandler('getTaskExactLogDetail', () =>
+    getBoardTaskExactLogDetailService().getTaskExactLogDetail(
+      vTeam.value!,
+      vTask.value!,
+      exactLogId.trim(),
+      expectedSourceGeneration.trim()
+    )
+  );
+}
+
 function getMemberStatsComputer(): MemberStatsComputer {
   if (!memberStatsComputer) {
     throw new Error('Member stats computer is not initialized');

src/main/services/team/TaskBoundaryParser.ts

@@ -3,6 +3,11 @@ import { createReadStream } from 'fs';
 import { stat } from 'fs/promises';
 import * as readline from 'readline';
 
+import {
+  canonicalizeAgentTeamsToolName,
+  isAgentTeamsTaskBoundaryToolName,
+} from './agentTeamsToolNames';
+
 import type {
   TaskBoundariesResult,
   TaskBoundary,
@@ -31,8 +36,6 @@ interface ToolUseInfo {
   filePath?: string;
 }
 
-const MCP_TASK_BOUNDARY_TOOLS = new Set(['task_start', 'task_complete', 'task_set_status']);
-
 type DetectedMechanism = 'TaskUpdate' | 'mcp' | 'none';
 
 function extractTaskId(input: Record<string, unknown>): string {
@@ -102,7 +105,7 @@ export class TaskBoundaryParser {
             const b = block as Record<string, unknown>;
             if (b.type !== 'tool_use') continue;
             const rawName = typeof b.name === 'string' ? b.name : '';
-            const toolName = rawName.replace(/^proxy_/, '');
+            const toolName = canonicalizeAgentTeamsToolName(rawName);
             const toolUseId = typeof b.id === 'string' ? b.id : '';
             const input = b.input as Record<string, unknown> | undefined;
             const fp = typeof input?.file_path === 'string' ? input.file_path : undefined;
@@ -238,8 +241,8 @@ export class TaskBoundaryParser {
       if (b.type !== 'tool_use') continue;
 
       const rawName = typeof b.name === 'string' ? b.name : '';
-      const toolName = rawName.replace(/^proxy_/, '');
+      const toolName = canonicalizeAgentTeamsToolName(rawName);
-      if (!MCP_TASK_BOUNDARY_TOOLS.has(toolName)) continue;
+      if (!isAgentTeamsTaskBoundaryToolName(toolName)) continue;
 
       const input = b.input as Record<string, unknown> | undefined;
       if (!input) continue;

src/main/services/team/TeamMemberLogsFinder.ts

@@ -10,6 +10,10 @@ import * as readline from 'readline';
 import { TeamConfigReader } from './TeamConfigReader';
 import { TeamInboxReader } from './TeamInboxReader';
 import { TeamMembersMetaStore } from './TeamMembersMetaStore';
+import {
+  canonicalizeAgentTeamsToolName,
+  lineHasAgentTeamsTaskBoundaryToolName,
+} from './agentTeamsToolNames';
 
 import type { MemberLogSummary, MemberSubagentLogSummary } from '@shared/types';
 
@@ -684,7 +688,7 @@ export class TeamMemberLogsFinder {
 
   async listAttributedSubagentFiles(
     teamName: string
-  ): Promise<Array<{ memberName: string; sessionId: string; filePath: string; mtimeMs: number }>> {
+  ): Promise<{ memberName: string; sessionId: string; filePath: string; mtimeMs: number }[]> {
     const discovery = await this.discoverProjectSessions(teamName);
     if (!discovery) return [];
 
@@ -700,12 +704,12 @@ export class TeamMemberLogsFinder {
         ? [currentLeadSessionId]
         : sessionIds;
     const candidates = await this.collectSubagentCandidates(projectDir, candidateSessionIds);
-    const results: Array<{
+    const results: {
       memberName: string;
       sessionId: string;
       filePath: string;
       mtimeMs: number;
-    }> = [];
+    }[] = [];
 
     const settled = await Promise.all(
       candidates.map(async (candidate) => {
@@ -764,12 +768,7 @@ export class TeamMemberLogsFinder {
           stream.destroy();
           return true;
         }
-        if (
+        if (lineHasAgentTeamsTaskBoundaryToolName(line) && pattern.test(line)) {
-          (line.includes('"task_start"') ||
-            line.includes('"task_complete"') ||
-            line.includes('"task_set_status"')) &&
-          pattern.test(line)
-        ) {
           rl.close();
           stream.destroy();
           return true;
@@ -1146,13 +1145,9 @@ export class TeamMemberLogsFinder {
             // Skip read-only task tools — they reference taskId but don't indicate
             // that this session actually WORKED on the task. Agents commonly call
             // task_get to check dependencies from other tasks, producing false matches.
-            const toolName = typeof b.name === 'string' ? b.name : '';
+            const rawToolName = typeof b.name === 'string' ? b.name : '';
-            if (
+            const toolName = canonicalizeAgentTeamsToolName(rawToolName);
-              toolName === 'task_get' ||
+            if (toolName === 'task_get' || toolName === 'TaskGet') continue;
-              toolName === 'mcp__agent-teams__task_get' ||
-              toolName === 'TaskGet'
-            )
-              continue;
 
             const input = b.input as Record<string, unknown> | undefined;
             if (!input) continue;

src/main/services/team/agentTeamsToolNames.ts

@@ -0,0 +1,43 @@
+const AGENT_TEAMS_PREFIXES = ['mcp__agent-teams__', 'mcp__agent_teams__'] as const;
+
+const TASK_BOUNDARY_TOOL_NAMES = ['task_start', 'task_complete', 'task_set_status'] as const;
+const TASK_BOUNDARY_TOOL_SET = new Set<string>(TASK_BOUNDARY_TOOL_NAMES);
+
+function escapeRegex(value: string): string {
+  return value.replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
+}
+
+const TASK_BOUNDARY_TOOL_LINE_PATTERN = new RegExp(
+  `"name"\\s*:\\s*"(?:${[
+    ...TASK_BOUNDARY_TOOL_NAMES,
+    ...TASK_BOUNDARY_TOOL_NAMES.map((toolName) => `proxy_${toolName}`),
+    ...AGENT_TEAMS_PREFIXES.flatMap((prefix) =>
+      TASK_BOUNDARY_TOOL_NAMES.map((toolName) => `${prefix}${toolName}`)
+    ),
+    ...AGENT_TEAMS_PREFIXES.flatMap((prefix) =>
+      TASK_BOUNDARY_TOOL_NAMES.map((toolName) => `proxy_${prefix}${toolName}`)
+    ),
+  ]
+    .map(escapeRegex)
+    .join('|')})"`
+);
+
+export function canonicalizeAgentTeamsToolName(rawName: string): string {
+  const normalized = rawName.replace(/^proxy_/, '');
+
+  for (const prefix of AGENT_TEAMS_PREFIXES) {
+    if (normalized.startsWith(prefix)) {
+      return normalized.slice(prefix.length);
+    }
+  }
+
+  return normalized;
+}
+
+export function isAgentTeamsTaskBoundaryToolName(rawName: string): boolean {
+  return TASK_BOUNDARY_TOOL_SET.has(canonicalizeAgentTeamsToolName(rawName));
+}
+
+export function lineHasAgentTeamsTaskBoundaryToolName(line: string): boolean {
+  return TASK_BOUNDARY_TOOL_LINE_PATTERN.test(line);
+}

src/main/services/team/index.ts

@@ -1,4 +1,9 @@
 export { BranchStatusService } from './BranchStatusService';
+export { BoardTaskActivityRecordSource } from './taskLogs/activity/BoardTaskActivityRecordSource';
+export { BoardTaskActivityService } from './taskLogs/activity/BoardTaskActivityService';
+export { BoardTaskExactLogsService } from './taskLogs/exact/BoardTaskExactLogsService';
+export { BoardTaskExactLogDetailService } from './taskLogs/exact/BoardTaskExactLogDetailService';
+export { BoardTaskLogStreamService } from './taskLogs/stream/BoardTaskLogStreamService';
 export { CascadeGuard } from './CascadeGuard';
 export { ChangeExtractorService } from './ChangeExtractorService';
 export { ClaudeBinaryResolver } from './ClaudeBinaryResolver';

src/main/services/team/taskLogs/activity/BoardTaskActivityEntryBuilder.ts

@@ -0,0 +1,83 @@
+import { BoardTaskActivityRecordBuilder } from './BoardTaskActivityRecordBuilder';
+
+import type { BoardTaskActivityEntry, TeamTask } from '@shared/types';
+import type { RawTaskActivityMessage } from './BoardTaskActivityTranscriptReader';
+import type { BoardTaskActivityRecord } from './BoardTaskActivityRecord';
+
+function cloneTaskRef(task: BoardTaskActivityRecord['task']): BoardTaskActivityEntry['task'] {
+  return {
+    locator: { ...task.locator },
+    resolution: task.resolution,
+    ...(task.taskRef ? { taskRef: { ...task.taskRef } } : {}),
+  };
+}
+
+function cloneActorContext(
+  actorContext: BoardTaskActivityRecord['actorContext']
+): BoardTaskActivityEntry['actorContext'] {
+  return {
+    relation: actorContext.relation,
+    ...(actorContext.activeTask ? { activeTask: cloneTaskRef(actorContext.activeTask) } : {}),
+    ...(actorContext.activePhase ? { activePhase: actorContext.activePhase } : {}),
+    ...(actorContext.activeExecutionSeq
+      ? { activeExecutionSeq: actorContext.activeExecutionSeq }
+      : {}),
+  };
+}
+
+function cloneAction(
+  action: BoardTaskActivityRecord['action']
+): BoardTaskActivityEntry['action'] | undefined {
+  if (!action) return undefined;
+
+  return {
+    ...(action.canonicalToolName ? { canonicalToolName: action.canonicalToolName } : {}),
+    ...(action.toolUseId ? { toolUseId: action.toolUseId } : {}),
+    category: action.category,
+    ...(action.peerTask ? { peerTask: cloneTaskRef(action.peerTask) } : {}),
+    ...(action.relationshipPerspective
+      ? { relationshipPerspective: action.relationshipPerspective }
+      : {}),
+    ...(action.details ? { details: { ...action.details } } : {}),
+  };
+}
+
+export class BoardTaskActivityEntryBuilder {
+  constructor(
+    private readonly recordBuilder: BoardTaskActivityRecordBuilder = new BoardTaskActivityRecordBuilder()
+  ) {}
+
+  buildForTask(args: {
+    teamName: string;
+    targetTask: TeamTask;
+    tasks: TeamTask[];
+    messages: RawTaskActivityMessage[];
+  }): BoardTaskActivityEntry[] {
+    return this.buildFromRecords(this.recordBuilder.buildForTask(args));
+  }
+
+  buildFromRecords(records: BoardTaskActivityRecord[]): BoardTaskActivityEntry[] {
+    return records.map((record) => ({
+      id: record.id,
+      timestamp: record.timestamp,
+      task: cloneTaskRef(record.task),
+      linkKind: record.linkKind,
+      targetRole: record.targetRole,
+      actor: {
+        ...(record.actor.memberName ? { memberName: record.actor.memberName } : {}),
+        role: record.actor.role,
+        sessionId: record.actor.sessionId,
+        ...(record.actor.agentId ? { agentId: record.actor.agentId } : {}),
+        isSidechain: record.actor.isSidechain,
+      },
+      actorContext: cloneActorContext(record.actorContext),
+      ...(record.action ? { action: cloneAction(record.action) } : {}),
+      source: {
+        messageUuid: record.source.messageUuid,
+        filePath: record.source.filePath,
+        ...(record.source.toolUseId ? { toolUseId: record.source.toolUseId } : {}),
+        sourceOrder: record.source.sourceOrder,
+      },
+    }));
+  }
+}

src/main/services/team/taskLogs/activity/BoardTaskActivityParseCache.ts

@@ -0,0 +1,54 @@
+interface CacheEntry<T> {
+  mtimeMs: number;
+  size: number;
+  value: T;
+}
+
+export class BoardTaskActivityParseCache<T> {
+  private readonly cache = new Map<string, CacheEntry<T>>();
+  private readonly inFlight = new Map<string, Promise<T>>();
+
+  getIfFresh(filePath: string, mtimeMs: number, size: number): T | null {
+    const cached = this.cache.get(filePath);
+    if (!cached) return null;
+    if (cached.mtimeMs !== mtimeMs || cached.size !== size) {
+      this.cache.delete(filePath);
+      return null;
+    }
+    return cached.value;
+  }
+
+  getInFlight(filePath: string): Promise<T> | null {
+    return this.inFlight.get(filePath) ?? null;
+  }
+
+  setInFlight(filePath: string, promise: Promise<T>): void {
+    this.inFlight.set(filePath, promise);
+  }
+
+  clearInFlight(filePath: string): void {
+    this.inFlight.delete(filePath);
+  }
+
+  set(filePath: string, mtimeMs: number, size: number, value: T): void {
+    this.cache.set(filePath, { mtimeMs, size, value });
+  }
+
+  clearForPath(filePath: string): void {
+    this.cache.delete(filePath);
+    this.inFlight.delete(filePath);
+  }
+
+  retainOnly(filePaths: Set<string>): void {
+    for (const filePath of this.cache.keys()) {
+      if (!filePaths.has(filePath)) {
+        this.cache.delete(filePath);
+      }
+    }
+    for (const filePath of this.inFlight.keys()) {
+      if (!filePaths.has(filePath)) {
+        this.inFlight.delete(filePath);
+      }
+    }
+  }
+}

src/main/services/team/taskLogs/activity/BoardTaskActivityRecord.ts

@@ -0,0 +1,25 @@
+import type {
+  BoardTaskActivityAction,
+  BoardTaskActivityActor,
+  BoardTaskActivityActorContext,
+  BoardTaskActivityLinkKind,
+  BoardTaskActivityTargetRole,
+  BoardTaskActivityTaskRef,
+} from '@shared/types';
+
+export interface BoardTaskActivityRecord {
+  id: string;
+  timestamp: string;
+  task: BoardTaskActivityTaskRef;
+  linkKind: BoardTaskActivityLinkKind;
+  targetRole: BoardTaskActivityTargetRole;
+  actor: BoardTaskActivityActor;
+  actorContext: BoardTaskActivityActorContext;
+  action?: BoardTaskActivityAction;
+  source: {
+    messageUuid: string;
+    filePath: string;
+    toolUseId?: string;
+    sourceOrder: number;
+  };
+}

src/main/services/team/taskLogs/activity/BoardTaskActivityRecordBuilder.ts

@@ -0,0 +1,382 @@
+import { createLogger } from '@shared/utils/logger';
+import { getTaskDisplayId } from '@shared/utils/taskIdentity';
+
+import type {
+  BoardTaskActivityAction,
+  BoardTaskActivityActor,
+  BoardTaskActivityCategory,
+  BoardTaskActivityTaskRef,
+  BoardTaskLocator,
+  TaskRef,
+  TeamTask,
+} from '@shared/types';
+import type { RawTaskActivityMessage } from './BoardTaskActivityTranscriptReader';
+import type {
+  ParsedBoardTaskLink,
+  ParsedBoardTaskToolAction,
+} from '../contract/BoardTaskTranscriptContract';
+import type { BoardTaskActivityRecord } from './BoardTaskActivityRecord';
+
+interface TaskLookup {
+  byId: Map<string, TeamTask>;
+  byDisplayId: Map<string, TeamTask[]>;
+}
+
+const logger = createLogger('Service:BoardTaskActivityRecordBuilder');
+
+const CANONICAL_TASK_ID_PATTERN =
+  /^[0-9a-f]{8}-[0-9a-f]{4}-[1-5][0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$/i;
+
+function noteReadDiagnostic(
+  event: string,
+  details: Record<string, string | number | undefined> = {}
+): void {
+  const suffix = Object.entries(details)
+    .filter(([, value]) => value !== undefined)
+    .map(([key, value]) => `${key}=${String(value)}`)
+    .join(' ');
+
+  logger.debug(`[board_task_activity.${event}]${suffix ? ` ${suffix}` : ''}`);
+}
+
+function buildTaskRef(teamName: string, task: TeamTask): TaskRef {
+  return {
+    taskId: task.id,
+    displayId: getTaskDisplayId(task),
+    teamName,
+  };
+}
+
+function normalizeDisplayRef(value: string): string {
+  return value.trim().toLowerCase();
+}
+
+function looksLikeCanonicalTaskId(value: string): boolean {
+  return CANONICAL_TASK_ID_PATTERN.test(value.trim());
+}
+
+function buildTaskLookup(tasks: TeamTask[]): TaskLookup {
+  const byId = new Map<string, TeamTask>();
+  const byDisplayId = new Map<string, TeamTask[]>();
+
+  for (const task of tasks) {
+    byId.set(task.id, task);
+    const displayId = normalizeDisplayRef(getTaskDisplayId(task));
+    const list = byDisplayId.get(displayId) ?? [];
+    list.push(task);
+    byDisplayId.set(displayId, list);
+  }
+
+  return { byId, byDisplayId };
+}
+
+function resolveLocatorToTaskRef(
+  teamName: string,
+  locator: BoardTaskLocator,
+  lookup: TaskLookup
+): BoardTaskActivityTaskRef {
+  const canonicalCandidate =
+    (locator.canonicalId && lookup.byId.get(locator.canonicalId)) ||
+    (locator.refKind === 'canonical' ? lookup.byId.get(locator.ref) : undefined) ||
+    (locator.refKind === 'unknown' && looksLikeCanonicalTaskId(locator.ref)
+      ? lookup.byId.get(locator.ref)
+      : undefined);
+
+  if (canonicalCandidate) {
+    return {
+      locator,
+      resolution: canonicalCandidate.status === 'deleted' ? 'deleted' : 'resolved',
+      taskRef: buildTaskRef(teamName, canonicalCandidate),
+    };
+  }
+
+  const displayCandidates = lookup.byDisplayId.get(normalizeDisplayRef(locator.ref)) ?? [];
+  if (displayCandidates.length === 1) {
+    const task = displayCandidates[0];
+    return {
+      locator,
+      resolution: task.status === 'deleted' ? 'deleted' : 'resolved',
+      taskRef: buildTaskRef(teamName, task),
+    };
+  }
+
+  if (displayCandidates.length > 1) {
+    noteReadDiagnostic('ambiguous_locator', { refKind: locator.refKind });
+    return {
+      locator,
+      resolution: 'ambiguous',
+    };
+  }
+
+  noteReadDiagnostic('unresolved_locator', { refKind: locator.refKind });
+  return {
+    locator,
+    resolution: 'unresolved',
+  };
+}
+
+function locatorCouldMatchTask(
+  locator: BoardTaskLocator,
+  targetTask: TeamTask,
+  lookup: TaskLookup
+): boolean {
+  if (locator.canonicalId === targetTask.id) return true;
+  if (locator.refKind === 'canonical' && locator.ref === targetTask.id) return true;
+
+  const targetDisplayId = getTaskDisplayId(targetTask);
+  const normalizedLocatorRef = normalizeDisplayRef(locator.ref);
+  const normalizedTargetDisplayId = normalizeDisplayRef(targetDisplayId);
+  if (normalizedLocatorRef !== normalizedTargetDisplayId) return false;
+
+  const candidates = lookup.byDisplayId.get(normalizedTargetDisplayId) ?? [];
+  if (candidates.length === 0) return false;
+  return candidates.some((candidate) => candidate.id === targetTask.id);
+}
+
+function buildActionMap(
+  actions: ParsedBoardTaskToolAction[]
+): Map<string, ParsedBoardTaskToolAction> {
+  const actionMap = new Map<string, ParsedBoardTaskToolAction>();
+  for (const action of actions) {
+    if (actionMap.has(action.toolUseId)) {
+      noteReadDiagnostic('duplicate_action_tool_use_id', { toolUseId: action.toolUseId });
+      continue;
+    }
+    actionMap.set(action.toolUseId, action);
+  }
+  return actionMap;
+}
+
+function buildActionCategory(action: ParsedBoardTaskToolAction): BoardTaskActivityCategory {
+  switch (action.canonicalToolName) {
+    case 'task_start':
+    case 'task_complete':
+    case 'task_set_status':
+      return 'status';
+    case 'review_start':
+    case 'review_request':
+    case 'review_approve':
+    case 'review_request_changes':
+      return 'review';
+    case 'task_add_comment':
+    case 'task_get_comment':
+      return 'comment';
+    case 'task_set_owner':
+      return 'assignment';
+    case 'task_get':
+      return 'read';
+    case 'task_attach_file':
+    case 'task_attach_comment_file':
+      return 'attachment';
+    case 'task_link':
+    case 'task_unlink':
+      return 'relationship';
+    case 'task_set_clarification':
+      return 'clarification';
+    default:
+      return 'other';
+  }
+}
+
+function buildActionDetails(
+  action: ParsedBoardTaskToolAction
+): BoardTaskActivityAction['details'] | undefined {
+  const details = {
+    ...(action.input?.status ? { status: action.input.status } : {}),
+    ...(action.input && 'owner' in action.input ? { owner: action.input.owner } : {}),
+    ...(action.input && 'clarification' in action.input
+      ? { clarification: action.input.clarification }
+      : {}),
+    ...(action.input?.reviewer ? { reviewer: action.input.reviewer } : {}),
+    ...(action.input?.relationship ? { relationship: action.input.relationship } : {}),
+    ...(action.input?.commentId ? { commentId: action.input.commentId } : {}),
+    ...(action.resultRefs?.commentId ? { commentId: action.resultRefs.commentId } : {}),
+    ...(action.resultRefs?.attachmentId ? { attachmentId: action.resultRefs.attachmentId } : {}),
+    ...(action.resultRefs?.filename ? { filename: action.resultRefs.filename } : {}),
+  };
+
+  return Object.keys(details).length > 0 ? details : undefined;
+}
+
+function buildRelationshipPerspective(
+  link: ParsedBoardTaskLink,
+  action: ParsedBoardTaskToolAction
+): BoardTaskActivityAction['relationshipPerspective'] | undefined {
+  const relationship = action.input?.relationship;
+  if (!relationship) {
+    return undefined;
+  }
+  if (relationship === 'related') {
+    return 'symmetric';
+  }
+  if (relationship === 'blocked-by') {
+    return link.targetRole === 'subject' ? 'incoming' : 'outgoing';
+  }
+  if (relationship === 'blocks') {
+    return link.targetRole === 'subject' ? 'outgoing' : 'incoming';
+  }
+  return undefined;
+}
+
+function buildAction(args: {
+  action: ParsedBoardTaskToolAction | undefined;
+  link: ParsedBoardTaskLink;
+  peerTask?: BoardTaskActivityTaskRef;
+}): BoardTaskActivityAction | undefined {
+  const { action, link, peerTask } = args;
+  if (!action) return undefined;
+  const category = buildActionCategory(action);
+  const details = buildActionDetails(action);
+  const relationshipPerspective =
+    category === 'relationship' ? buildRelationshipPerspective(link, action) : undefined;
+
+  return {
+    canonicalToolName: action.canonicalToolName,
+    toolUseId: action.toolUseId,
+    category,
+    ...(details ? { details } : {}),
+    ...(category === 'relationship' && peerTask ? { peerTask } : {}),
+    ...(relationshipPerspective ? { relationshipPerspective } : {}),
+  };
+}
+
+function resolveActivityActor(message: RawTaskActivityMessage): BoardTaskActivityActor {
+  const memberName =
+    typeof message.agentName === 'string' && message.agentName.trim().length > 0
+      ? message.agentName.trim()
+      : undefined;
+
+  return {
+    ...(memberName ? { memberName } : {}),
+    role: memberName
+      ? message.isSidechain
+        ? 'member'
+        : 'lead'
+      : message.isSidechain
+        ? 'member'
+        : 'unknown',
+    sessionId: message.sessionId,
+    ...(message.agentId ? { agentId: message.agentId } : {}),
+    isSidechain: message.isSidechain,
+  };
+}
+
+function resolvePeerTask(
+  teamName: string,
+  currentLink: ParsedBoardTaskLink,
+  allLinks: ParsedBoardTaskLink[],
+  targetTask: TeamTask,
+  lookup: TaskLookup
+): BoardTaskActivityTaskRef | undefined {
+  for (const link of allLinks) {
+    if (link === currentLink) continue;
+    if (link.toolUseId !== currentLink.toolUseId) continue;
+    if (locatorCouldMatchTask(link.task, targetTask, lookup)) continue;
+    return resolveLocatorToTaskRef(teamName, link.task, lookup);
+  }
+  return undefined;
+}
+
+function buildActorContext(
+  teamName: string,
+  actorContext: ParsedBoardTaskLink['actorContext'],
+  lookup: TaskLookup
+): BoardTaskActivityRecord['actorContext'] {
+  return {
+    relation: actorContext.relation,
+    ...(actorContext.activeTask
+      ? { activeTask: resolveLocatorToTaskRef(teamName, actorContext.activeTask, lookup) }
+      : {}),
+    ...(actorContext.activePhase ? { activePhase: actorContext.activePhase } : {}),
+    ...(actorContext.activeExecutionSeq
+      ? { activeExecutionSeq: actorContext.activeExecutionSeq }
+      : {}),
+  };
+}
+
+function compareRecords(left: BoardTaskActivityRecord, right: BoardTaskActivityRecord): number {
+  const leftTs = Date.parse(left.timestamp);
+  const rightTs = Date.parse(right.timestamp);
+  if (Number.isFinite(leftTs) && Number.isFinite(rightTs) && leftTs !== rightTs) {
+    return leftTs - rightTs;
+  }
+  if (left.source.filePath !== right.source.filePath) {
+    return left.source.filePath.localeCompare(right.source.filePath);
+  }
+  if (left.source.sourceOrder !== right.source.sourceOrder) {
+    return left.source.sourceOrder - right.source.sourceOrder;
+  }
+  if ((left.source.toolUseId ?? '') !== (right.source.toolUseId ?? '')) {
+    return (left.source.toolUseId ?? '').localeCompare(right.source.toolUseId ?? '');
+  }
+  return left.id.localeCompare(right.id);
+}
+
+export class BoardTaskActivityRecordBuilder {
+  buildForTask(args: {
+    teamName: string;
+    targetTask: TeamTask;
+    tasks: TeamTask[];
+    messages: RawTaskActivityMessage[];
+  }): BoardTaskActivityRecord[] {
+    const lookup = buildTaskLookup(args.tasks);
+    const records: BoardTaskActivityRecord[] = [];
+    const seenIds = new Set<string>();
+
+    for (const message of args.messages) {
+      const actionMap = buildActionMap(message.boardTaskToolActions);
+
+      for (const link of message.boardTaskLinks) {
+        const resolvedTask = resolveLocatorToTaskRef(args.teamName, link.task, lookup);
+        if (
+          resolvedTask.taskRef?.taskId !== args.targetTask.id &&
+          !locatorCouldMatchTask(link.task, args.targetTask, lookup)
+        ) {
+          continue;
+        }
+
+        const action =
+          link.linkKind === 'execution' || !link.toolUseId
+            ? undefined
+            : actionMap.get(link.toolUseId);
+        const peerTask = resolvePeerTask(
+          args.teamName,
+          link,
+          message.boardTaskLinks,
+          args.targetTask,
+          lookup
+        );
+        const record: BoardTaskActivityRecord = {
+          id: [
+            message.uuid,
+            link.toolUseId ?? 'ambient',
+            link.task.ref,
+            link.targetRole,
+            link.linkKind,
+          ].join(':'),
+          timestamp: message.timestamp,
+          task: resolvedTask,
+          linkKind: link.linkKind,
+          targetRole: link.targetRole,
+          actor: resolveActivityActor(message),
+          actorContext: buildActorContext(args.teamName, link.actorContext, lookup),
+          ...(action ? { action: buildAction({ action, link, peerTask }) } : {}),
+          source: {
+            messageUuid: message.uuid,
+            filePath: message.filePath,
+            ...(link.toolUseId ? { toolUseId: link.toolUseId } : {}),
+            sourceOrder: message.sourceOrder,
+          },
+        };
+
+        if (seenIds.has(record.id)) {
+          continue;
+        }
+        seenIds.add(record.id);
+        records.push(record);
+      }
+    }
+
+    return records.sort(compareRecords);
+  }
+}

src/main/services/team/taskLogs/activity/BoardTaskActivityRecordSource.ts

@@ -0,0 +1,37 @@
+import { TeamTaskReader } from '../../TeamTaskReader';
+import { TeamTranscriptSourceLocator } from '../discovery/TeamTranscriptSourceLocator';
+import { BoardTaskActivityRecordBuilder } from './BoardTaskActivityRecordBuilder';
+import { BoardTaskActivityTranscriptReader } from './BoardTaskActivityTranscriptReader';
+
+import type { BoardTaskActivityRecord } from './BoardTaskActivityRecord';
+
+export class BoardTaskActivityRecordSource {
+  constructor(
+    private readonly transcriptSourceLocator: TeamTranscriptSourceLocator = new TeamTranscriptSourceLocator(),
+    private readonly taskReader: TeamTaskReader = new TeamTaskReader(),
+    private readonly transcriptReader: BoardTaskActivityTranscriptReader = new BoardTaskActivityTranscriptReader(),
+    private readonly recordBuilder: BoardTaskActivityRecordBuilder = new BoardTaskActivityRecordBuilder()
+  ) {}
+
+  async getTaskRecords(teamName: string, taskId: string): Promise<BoardTaskActivityRecord[]> {
+    const [activeTasks, deletedTasks, transcriptFiles] = await Promise.all([
+      this.taskReader.getTasks(teamName),
+      this.taskReader.getDeletedTasks(teamName),
+      this.transcriptSourceLocator.listTranscriptFiles(teamName),
+    ]);
+
+    const tasks = [...activeTasks, ...deletedTasks];
+    const targetTask = tasks.find((task) => task.id === taskId);
+    if (!targetTask || transcriptFiles.length === 0) {
+      return [];
+    }
+
+    const messages = await this.transcriptReader.readFiles(transcriptFiles);
+    return this.recordBuilder.buildForTask({
+      teamName,
+      targetTask,
+      tasks,
+      messages,
+    });
+  }
+}

src/main/services/team/taskLogs/activity/BoardTaskActivityService.ts

@@ -0,0 +1,21 @@
+import { BoardTaskActivityEntryBuilder } from './BoardTaskActivityEntryBuilder';
+import { BoardTaskActivityRecordSource } from './BoardTaskActivityRecordSource';
+import { isBoardTaskActivityReadEnabled } from './featureGates';
+
+import type { BoardTaskActivityEntry } from '@shared/types';
+
+export class BoardTaskActivityService {
+  constructor(
+    private readonly recordSource: BoardTaskActivityRecordSource = new BoardTaskActivityRecordSource(),
+    private readonly entryBuilder: BoardTaskActivityEntryBuilder = new BoardTaskActivityEntryBuilder()
+  ) {}
+
+  async getTaskActivity(teamName: string, taskId: string): Promise<BoardTaskActivityEntry[]> {
+    if (!isBoardTaskActivityReadEnabled()) {
+      return [];
+    }
+
+    const records = await this.recordSource.getTaskRecords(teamName, taskId);
+    return this.entryBuilder.buildFromRecords(records);
+  }
+}

src/main/services/team/taskLogs/activity/BoardTaskActivityTranscriptReader.ts

@@ -0,0 +1,125 @@
+import { createLogger } from '@shared/utils/logger';
+import { createReadStream } from 'fs';
+import * as fs from 'fs/promises';
+import * as readline from 'readline';
+
+import { yieldToEventLoop } from '@main/utils/asyncYield';
+
+import { BoardTaskActivityParseCache } from './BoardTaskActivityParseCache';
+import {
+  parseBoardTaskLinks,
+  parseBoardTaskToolActions,
+  type ParsedBoardTaskLink,
+  type ParsedBoardTaskToolAction,
+} from '../contract/BoardTaskTranscriptContract';
+
+const logger = createLogger('Service:BoardTaskActivityTranscriptReader');
+
+export interface RawTaskActivityMessage {
+  filePath: string;
+  uuid: string;
+  timestamp: string;
+  sessionId: string;
+  agentId?: string;
+  agentName?: string;
+  isSidechain: boolean;
+  boardTaskLinks: ParsedBoardTaskLink[];
+  boardTaskToolActions: ParsedBoardTaskToolAction[];
+  sourceOrder: number;
+}
+
+function asRecord(value: unknown): Record<string, unknown> | null {
+  return value && typeof value === 'object' ? (value as Record<string, unknown>) : null;
+}
+
+export class BoardTaskActivityTranscriptReader {
+  private readonly cache = new BoardTaskActivityParseCache<RawTaskActivityMessage[]>();
+
+  async readFiles(filePaths: string[]): Promise<RawTaskActivityMessage[]> {
+    const uniqueFilePaths = [...new Set(filePaths)].sort();
+    this.cache.retainOnly(new Set(uniqueFilePaths));
+
+    const parsedFiles = await Promise.all(
+      uniqueFilePaths.map((filePath) => this.readFile(filePath))
+    );
+    return parsedFiles.flat();
+  }
+
+  private async readFile(filePath: string): Promise<RawTaskActivityMessage[]> {
+    try {
+      const stat = await fs.stat(filePath);
+      const cached = this.cache.getIfFresh(filePath, stat.mtimeMs, stat.size);
+      if (cached) {
+        return cached;
+      }
+
+      const inFlight = this.cache.getInFlight(filePath);
+      if (inFlight) {
+        return inFlight;
+      }
+
+      const promise = this.parseFile(filePath);
+      this.cache.setInFlight(filePath, promise);
+      try {
+        const parsed = await promise;
+        this.cache.set(filePath, stat.mtimeMs, stat.size, parsed);
+        return parsed;
+      } finally {
+        this.cache.clearInFlight(filePath);
+      }
+    } catch (error) {
+      logger.debug(`Skipping unreadable task-activity transcript ${filePath}: ${String(error)}`);
+      this.cache.clearForPath(filePath);
+      return [];
+    }
+  }
+
+  private async parseFile(filePath: string): Promise<RawTaskActivityMessage[]> {
+    const results: RawTaskActivityMessage[] = [];
+    const stream = createReadStream(filePath, { encoding: 'utf8' });
+    const rl = readline.createInterface({
+      input: stream,
+      crlfDelay: Infinity,
+    });
+
+    let sourceOrder = 0;
+    for await (const line of rl) {
+      if (!line.trim()) continue;
+
+      try {
+        const parsed = JSON.parse(line) as unknown;
+        const record = asRecord(parsed);
+        if (!record) continue;
+
+        const uuid = typeof record.uuid === 'string' ? record.uuid : '';
+        const sessionId = typeof record.sessionId === 'string' ? record.sessionId : '';
+        const timestamp = typeof record.timestamp === 'string' ? record.timestamp : '';
+        if (!uuid || !sessionId || !timestamp) continue;
+
+        const boardTaskLinks = parseBoardTaskLinks(record.boardTaskLinks);
+        if (boardTaskLinks.length === 0) continue;
+
+        sourceOrder += 1;
+        results.push({
+          filePath,
+          uuid,
+          timestamp,
+          sessionId,
+          agentId: typeof record.agentId === 'string' ? record.agentId : undefined,
+          agentName: typeof record.agentName === 'string' ? record.agentName : undefined,
+          isSidechain: record.isSidechain === true,
+          boardTaskLinks,
+          boardTaskToolActions: parseBoardTaskToolActions(record.boardTaskToolActions),
+          sourceOrder,
+        });
+      } catch (error) {
+        logger.debug(`Skipping malformed task-activity line in ${filePath}: ${String(error)}`);
+      }
+
+      if (sourceOrder > 0 && sourceOrder % 250 === 0) {
+        await yieldToEventLoop();
+      }
+    }
+    return results;
+  }
+}

src/main/services/team/taskLogs/activity/featureGates.ts

@@ -0,0 +1,18 @@
+function readEnabledFlag(value: string | undefined, defaultValue: boolean): boolean {
+  if (value == null) {
+    return defaultValue;
+  }
+
+  const normalized = value.trim().toLowerCase();
+  if (normalized === '0' || normalized === 'false' || normalized === 'off' || normalized === 'no') {
+    return false;
+  }
+  if (normalized === '1' || normalized === 'true' || normalized === 'on' || normalized === 'yes') {
+    return true;
+  }
+  return defaultValue;
+}
+
+export function isBoardTaskActivityReadEnabled(): boolean {
+  return readEnabledFlag(process.env.CLAUDE_TEAM_BOARD_TASK_ACTIVITY_READ_ENABLED, true);
+}

src/main/services/team/taskLogs/contract/BoardTaskTranscriptContract.ts

@@ -0,0 +1,308 @@
+import { createLogger } from '@shared/utils/logger';
+import type {
+  BoardTaskActivityLinkKind,
+  BoardTaskActivityPhase,
+  BoardTaskActivityTargetRole,
+  BoardTaskActorRelation,
+  BoardTaskLocator,
+} from '@shared/types';
+
+const logger = createLogger('Service:BoardTaskTranscriptContract');
+
+export interface ParsedBoardTaskActorContext {
+  relation: BoardTaskActorRelation;
+  activeTask?: BoardTaskLocator;
+  activePhase?: BoardTaskActivityPhase;
+  activeExecutionSeq?: number;
+}
+
+export interface ParsedBoardTaskLink {
+  schemaVersion: 1;
+  toolUseId?: string;
+  task: BoardTaskLocator;
+  targetRole: BoardTaskActivityTargetRole;
+  linkKind: BoardTaskActivityLinkKind;
+  taskArgumentSlot?: 'taskId' | 'targetId';
+  actorContext: ParsedBoardTaskActorContext;
+}
+
+export interface ParsedBoardTaskToolAction {
+  schemaVersion: 1;
+  toolUseId: string;
+  canonicalToolName: string;
+  input?: {
+    status?: 'pending' | 'in_progress' | 'completed' | 'deleted';
+    owner?: string | null;
+    clarification?: 'lead' | 'user' | null;
+    reviewer?: string;
+    relationship?: 'blocked-by' | 'blocks' | 'related';
+    commentId?: string;
+  };
+  resultRefs?: {
+    commentId?: string;
+    attachmentId?: string;
+    filename?: string;
+  };
+}
+
+function asRecord(value: unknown): Record<string, unknown> | null {
+  return value && typeof value === 'object' ? (value as Record<string, unknown>) : null;
+}
+
+function asNonEmptyString(value: unknown): string | undefined {
+  return typeof value === 'string' && value.trim().length > 0 ? value.trim() : undefined;
+}
+
+function parseNullableOwner(value: unknown): string | null | undefined {
+  if (value === null) return null;
+  const normalized = asNonEmptyString(value);
+  if (!normalized) return undefined;
+  if (normalized === 'clear' || normalized === 'none') {
+    return null;
+  }
+  return normalized;
+}
+
+function parseStatus(
+  value: unknown
+): 'pending' | 'in_progress' | 'completed' | 'deleted' | undefined {
+  const normalized = asNonEmptyString(value);
+  if (
+    normalized === 'pending' ||
+    normalized === 'in_progress' ||
+    normalized === 'completed' ||
+    normalized === 'deleted'
+  ) {
+    return normalized;
+  }
+  return undefined;
+}
+
+function parseRelationship(value: unknown): 'blocked-by' | 'blocks' | 'related' | undefined {
+  const normalized = asNonEmptyString(value);
+  if (normalized === 'blocked-by' || normalized === 'blocks' || normalized === 'related') {
+    return normalized;
+  }
+  return undefined;
+}
+
+function parseClarification(value: unknown): 'lead' | 'user' | null | undefined {
+  if (value === null) return null;
+  const normalized = asNonEmptyString(value);
+  if (!normalized) return undefined;
+  if (normalized === 'lead' || normalized === 'user') {
+    return normalized;
+  }
+  if (normalized === 'clear') {
+    return null;
+  }
+  return undefined;
+}
+
+function noteReadDiagnostic(
+  event: string,
+  details: Record<string, string | number | undefined> = {}
+): void {
+  const suffix = Object.entries(details)
+    .filter(([, value]) => value !== undefined)
+    .map(([key, value]) => `${key}=${String(value)}`)
+    .join(' ');
+
+  logger.debug(`[board_task_activity.${event}]${suffix ? ` ${suffix}` : ''}`);
+}
+
+function parseSchemaVersion(record: Record<string, unknown>): 1 | null {
+  if (record.schemaVersion === 1) {
+    return 1;
+  }
+  if (record.version === 1) {
+    return 1;
+  }
+  return null;
+}
+
+export function parseBoardTaskLocator(value: unknown): BoardTaskLocator | null {
+  const record = asRecord(value);
+  if (!record) return null;
+
+  const ref = asNonEmptyString(record.ref);
+  const refKind = asNonEmptyString(record.refKind);
+  if (!ref || (refKind !== 'canonical' && refKind !== 'display' && refKind !== 'unknown')) {
+    return null;
+  }
+
+  const canonicalId = asNonEmptyString(record.canonicalId);
+  return {
+    ref,
+    refKind,
+    ...(canonicalId ? { canonicalId } : {}),
+  };
+}
+
+function parseActorContext(value: unknown): ParsedBoardTaskActorContext | null {
+  const record = asRecord(value);
+  if (!record) return null;
+
+  const relation = asNonEmptyString(record.relation);
+  if (
+    relation !== 'same_task' &&
+    relation !== 'other_active_task' &&
+    relation !== 'idle' &&
+    relation !== 'ambiguous'
+  ) {
+    return null;
+  }
+
+  const activeTask = parseBoardTaskLocator(record.activeTask);
+  const activePhase = asNonEmptyString(record.activePhase);
+  const activeExecutionSeq =
+    typeof record.activeExecutionSeq === 'number' && Number.isFinite(record.activeExecutionSeq)
+      ? record.activeExecutionSeq
+      : undefined;
+
+  if (relation !== 'other_active_task') {
+    return { relation };
+  }
+
+  return {
+    relation,
+    ...(activeTask ? { activeTask } : {}),
+    ...(activePhase === 'work' || activePhase === 'review' ? { activePhase } : {}),
+    ...(activeExecutionSeq ? { activeExecutionSeq } : {}),
+  };
+}
+
+export function parseBoardTaskLinks(value: unknown): ParsedBoardTaskLink[] {
+  if (!Array.isArray(value)) return [];
+
+  const parsed: ParsedBoardTaskLink[] = [];
+  for (const item of value) {
+    const record = asRecord(item);
+    if (!record) {
+      noteReadDiagnostic('link_parse_dropped', { reason: 'not_object' });
+      continue;
+    }
+
+    const schemaVersion = parseSchemaVersion(record);
+    if (schemaVersion !== 1) {
+      noteReadDiagnostic('link_parse_dropped', { reason: 'unsupported_version' });
+      continue;
+    }
+
+    const task = parseBoardTaskLocator(record.task);
+    const targetRole = asNonEmptyString(record.targetRole);
+    const linkKind = asNonEmptyString(record.linkKind);
+    const actorContext = parseActorContext(record.actorContext);
+    const rawTaskArgumentSlot = asNonEmptyString(record.taskArgumentSlot);
+    const taskArgumentSlot =
+      rawTaskArgumentSlot === 'taskId' || rawTaskArgumentSlot === 'targetId'
+        ? rawTaskArgumentSlot
+        : undefined;
+    const toolUseId = asNonEmptyString(record.toolUseId);
+
+    if (!task) {
+      noteReadDiagnostic('link_parse_dropped', { reason: 'invalid_task' });
+      continue;
+    }
+    if (!actorContext) {
+      noteReadDiagnostic('link_parse_dropped', { reason: 'invalid_actor_context' });
+      continue;
+    }
+    if (targetRole !== 'subject' && targetRole !== 'related') {
+      noteReadDiagnostic('link_parse_dropped', { reason: 'invalid_target_role' });
+      continue;
+    }
+    if (linkKind !== 'execution' && linkKind !== 'lifecycle' && linkKind !== 'board_action') {
+      noteReadDiagnostic('link_parse_dropped', { reason: 'invalid_link_kind' });
+      continue;
+    }
+    const sanitizedToolUseId = toolUseId;
+    const sanitizedTaskArgumentSlot = linkKind === 'execution' ? undefined : taskArgumentSlot;
+
+    parsed.push({
+      schemaVersion: 1,
+      task,
+      targetRole,
+      linkKind,
+      actorContext,
+      ...(sanitizedToolUseId ? { toolUseId: sanitizedToolUseId } : {}),
+      ...(sanitizedTaskArgumentSlot ? { taskArgumentSlot: sanitizedTaskArgumentSlot } : {}),
+    });
+  }
+
+  return parsed;
+}
+
+export function parseBoardTaskToolActions(value: unknown): ParsedBoardTaskToolAction[] {
+  if (!Array.isArray(value)) return [];
+
+  const parsed: ParsedBoardTaskToolAction[] = [];
+  for (const item of value) {
+    const record = asRecord(item);
+    if (!record) {
+      noteReadDiagnostic('action_parse_dropped', { reason: 'not_object' });
+      continue;
+    }
+    if (parseSchemaVersion(record) !== 1) {
+      noteReadDiagnostic('action_parse_dropped', { reason: 'unsupported_version' });
+      continue;
+    }
+
+    const toolUseId = asNonEmptyString(record.toolUseId);
+    const canonicalToolName = asNonEmptyString(record.canonicalToolName);
+    if (!toolUseId || !canonicalToolName) {
+      noteReadDiagnostic('action_parse_dropped', { reason: 'missing_identity' });
+      continue;
+    }
+
+    const inputRecord = asRecord(record.input);
+    const resultRefsRecord = asRecord(record.resultRefs);
+
+    parsed.push({
+      schemaVersion: 1,
+      toolUseId,
+      canonicalToolName,
+      ...(inputRecord
+        ? {
+            input: {
+              ...(parseStatus(inputRecord.status) !== undefined
+                ? { status: parseStatus(inputRecord.status) }
+                : {}),
+              ...(parseNullableOwner(inputRecord.owner) !== undefined
+                ? { owner: parseNullableOwner(inputRecord.owner) }
+                : {}),
+              ...(parseClarification(inputRecord.clarification) !== undefined
+                ? { clarification: parseClarification(inputRecord.clarification) }
+                : {}),
+              ...(asNonEmptyString(inputRecord.reviewer)
+                ? { reviewer: asNonEmptyString(inputRecord.reviewer) }
+                : {}),
+              ...(parseRelationship(inputRecord.relationship) !== undefined
+                ? { relationship: parseRelationship(inputRecord.relationship) }
+                : {}),
+              ...(asNonEmptyString(inputRecord.commentId)
+                ? { commentId: asNonEmptyString(inputRecord.commentId) }
+                : {}),
+            },
+          }
+        : {}),
+      ...(resultRefsRecord
+        ? {
+            resultRefs: {
+              ...(asNonEmptyString(resultRefsRecord.commentId)
+                ? { commentId: asNonEmptyString(resultRefsRecord.commentId) }
+                : {}),
+              ...(asNonEmptyString(resultRefsRecord.attachmentId)
+                ? { attachmentId: asNonEmptyString(resultRefsRecord.attachmentId) }
+                : {}),
+              ...(asNonEmptyString(resultRefsRecord.filename)
+                ? { filename: asNonEmptyString(resultRefsRecord.filename) }
+                : {}),
+            },
+          }
+        : {}),
+    });
+  }
+
+  return parsed;
+}

src/main/services/team/taskLogs/diagnostics/BoardTaskLogDiagnosticsService.ts

@@ -0,0 +1,400 @@
+import { TeamTaskReader } from '../../TeamTaskReader';
+import { BoardTaskActivityRecordSource } from '../activity/BoardTaskActivityRecordSource';
+import type { BoardTaskActivityRecord } from '../activity/BoardTaskActivityRecord';
+import { TeamTranscriptSourceLocator } from '../discovery/TeamTranscriptSourceLocator';
+import { BoardTaskExactLogStrictParser } from '../exact/BoardTaskExactLogStrictParser';
+import { BoardTaskLogStreamService } from '../stream/BoardTaskLogStreamService';
+
+import type { ParsedMessage } from '@main/types';
+import type { TeamTask, TaskWorkInterval } from '@shared/types';
+import { getTaskDisplayId, taskMatchesRef } from '@shared/utils/taskIdentity';
+
+const BOARD_MCP_TOOL_PREFIXES = ['mcp__agent-teams__', 'mcp__agent_teams__'] as const;
+const MAX_EXAMPLES = 10;
+
+export interface BoardTaskLogDiagnosticExample {
+  timestamp: string;
+  filePath: string;
+  messageUuid: string;
+  toolUseId?: string;
+  toolName: string;
+  isSidechain: boolean;
+  agentId?: string;
+}
+
+export interface BoardTaskLogDiagnosticsReport {
+  teamName: string;
+  requestedTaskRef: string;
+  task: {
+    taskId: string;
+    displayId: string;
+    subject: string;
+    status: TeamTask['status'];
+    owner?: string;
+    workIntervals: TaskWorkInterval[];
+  };
+  transcript: {
+    fileCount: number;
+    files: string[];
+  };
+  explicitRecords: {
+    total: number;
+    execution: number;
+    lifecycle: number;
+    boardAction: number;
+    participants: string[];
+    toolNames: string[];
+  };
+  intervalToolResults: {
+    total: number;
+    boardMcp: number;
+    worker: {
+      total: number;
+      explicitLinked: number;
+      missingExplicit: number;
+      examples: BoardTaskLogDiagnosticExample[];
+    };
+  };
+  stream: {
+    participants: string[];
+    defaultFilter: string;
+    segmentCount: number;
+    visibleToolNames: string[];
+    emptyPayloadExamples: BoardTaskLogDiagnosticExample[];
+  };
+  diagnosis: string[];
+}
+
+function normalizeRequestedTaskRef(taskRef: string): string {
+  return taskRef.trim().replace(/^#/, '');
+}
+
+function isBoardMcpToolName(toolName: string | undefined): boolean {
+  if (!toolName) return false;
+  const normalized = toolName.trim().toLowerCase();
+  return BOARD_MCP_TOOL_PREFIXES.some((prefix) => normalized.startsWith(prefix));
+}
+
+function isWithinWorkIntervals(timestamp: Date, intervals: TaskWorkInterval[]): boolean {
+  if (!Number.isFinite(timestamp.getTime())) {
+    return false;
+  }
+  if (intervals.length === 0) {
+    return true;
+  }
+
+  const time = timestamp.getTime();
+  return intervals.some((interval) => {
+    const startedAt = Date.parse(interval.startedAt);
+    if (!Number.isFinite(startedAt) || time < startedAt) {
+      return false;
+    }
+    if (!interval.completedAt) {
+      return true;
+    }
+    const completedAt = Date.parse(interval.completedAt);
+    return !Number.isFinite(completedAt) || time <= completedAt;
+  });
+}
+
+function pushUnique(values: string[], value: string | undefined): void {
+  if (!value) return;
+  if (!values.includes(value)) {
+    values.push(value);
+  }
+}
+
+function pushExample(
+  examples: BoardTaskLogDiagnosticExample[],
+  example: BoardTaskLogDiagnosticExample
+): void {
+  if (examples.length < MAX_EXAMPLES) {
+    examples.push(example);
+  }
+}
+
+function buildParticipantLabel(record: BoardTaskActivityRecord): string {
+  if (record.actor.memberName) {
+    return record.actor.memberName;
+  }
+  if (!record.actor.isSidechain || record.actor.role === 'lead') {
+    return 'lead session';
+  }
+  if (record.actor.agentId) {
+    return `member ${record.actor.agentId.slice(0, 8)}`;
+  }
+  return `member session ${record.actor.sessionId.slice(0, 8)}`;
+}
+
+function extractVisibleToolNames(
+  stream: Awaited<ReturnType<BoardTaskLogStreamService['getTaskLogStream']>>
+): string[] {
+  const toolNames: string[] = [];
+  for (const segment of stream.segments) {
+    for (const chunk of segment.chunks) {
+      for (const message of chunk.rawMessages) {
+        for (const toolCall of message.toolCalls) {
+          pushUnique(toolNames, toolCall.name);
+        }
+      }
+    }
+  }
+  return toolNames;
+}
+
+function buildStreamToolNameMap(
+  stream: Awaited<ReturnType<BoardTaskLogStreamService['getTaskLogStream']>>
+): Map<string, string> {
+  const toolNameByUseId = new Map<string, string>();
+  for (const segment of stream.segments) {
+    for (const chunk of segment.chunks) {
+      for (const message of chunk.rawMessages) {
+        for (const toolCall of message.toolCalls) {
+          toolNameByUseId.set(toolCall.id, toolCall.name);
+        }
+      }
+    }
+  }
+  return toolNameByUseId;
+}
+
+function isEmptyToolPayload(value: unknown): boolean {
+  if (value == null) return true;
+  if (typeof value === 'string') {
+    return value.trim().length === 0;
+  }
+  if (Array.isArray(value)) {
+    return value.length === 0;
+  }
+  return false;
+}
+
+function collectEmptyPayloadExamples(
+  stream: Awaited<ReturnType<BoardTaskLogStreamService['getTaskLogStream']>>
+): BoardTaskLogDiagnosticExample[] {
+  const examples: BoardTaskLogDiagnosticExample[] = [];
+  const toolNameByUseId = buildStreamToolNameMap(stream);
+
+  for (const segment of stream.segments) {
+    for (const chunk of segment.chunks) {
+      for (const message of chunk.rawMessages) {
+        for (const toolResult of message.toolResults) {
+          if (!isEmptyToolPayload(toolResult.content)) {
+            continue;
+          }
+          pushExample(examples, {
+            timestamp: message.timestamp.toISOString(),
+            filePath: 'stream',
+            messageUuid: message.uuid,
+            toolUseId: toolResult.toolUseId,
+            toolName: toolNameByUseId.get(toolResult.toolUseId) ?? 'unknown tool',
+            isSidechain: message.isSidechain,
+            ...(message.agentId ? { agentId: message.agentId } : {}),
+          });
+        }
+
+        const toolUseResult = message.toolUseResult;
+        if (!toolUseResult) {
+          continue;
+        }
+        const toolUseId =
+          typeof toolUseResult.toolUseId === 'string'
+            ? toolUseResult.toolUseId
+            : message.sourceToolUseID;
+        const contentIsEmpty =
+          (!('content' in toolUseResult) || isEmptyToolPayload(toolUseResult.content)) &&
+          (!('message' in toolUseResult) || isEmptyToolPayload(toolUseResult.message));
+        if (!contentIsEmpty) {
+          continue;
+        }
+
+        pushExample(examples, {
+          timestamp: message.timestamp.toISOString(),
+          filePath: 'stream',
+          messageUuid: message.uuid,
+          ...(toolUseId ? { toolUseId } : {}),
+          toolName: toolUseId ? (toolNameByUseId.get(toolUseId) ?? 'unknown tool') : 'unknown tool',
+          isSidechain: message.isSidechain,
+          ...(message.agentId ? { agentId: message.agentId } : {}),
+        });
+      }
+    }
+  }
+
+  return examples;
+}
+
+function buildToolNameMap(parsedMessagesByFile: Map<string, ParsedMessage[]>): Map<string, string> {
+  const toolNameByUseId = new Map<string, string>();
+  for (const messages of parsedMessagesByFile.values()) {
+    for (const message of messages) {
+      for (const toolCall of message.toolCalls) {
+        toolNameByUseId.set(toolCall.id, toolCall.name);
+      }
+    }
+  }
+  return toolNameByUseId;
+}
+
+export class BoardTaskLogDiagnosticsService {
+  constructor(
+    private readonly taskReader: TeamTaskReader = new TeamTaskReader(),
+    private readonly transcriptSourceLocator: TeamTranscriptSourceLocator = new TeamTranscriptSourceLocator(),
+    private readonly recordSource: BoardTaskActivityRecordSource = new BoardTaskActivityRecordSource(),
+    private readonly strictParser: BoardTaskExactLogStrictParser = new BoardTaskExactLogStrictParser(),
+    private readonly streamService: BoardTaskLogStreamService = new BoardTaskLogStreamService()
+  ) {}
+
+  async diagnose(teamName: string, taskRef: string): Promise<BoardTaskLogDiagnosticsReport> {
+    const normalizedRef = normalizeRequestedTaskRef(taskRef);
+    const [activeTasks, deletedTasks, transcriptFiles] = await Promise.all([
+      this.taskReader.getTasks(teamName),
+      this.taskReader.getDeletedTasks(teamName),
+      this.transcriptSourceLocator.listTranscriptFiles(teamName),
+    ]);
+
+    const tasks = [...activeTasks, ...deletedTasks];
+    const task = tasks.find((candidate) => taskMatchesRef(candidate, normalizedRef));
+    if (!task) {
+      throw new Error(`Task "${taskRef}" was not found in team "${teamName}"`);
+    }
+
+    const records = await this.recordSource.getTaskRecords(teamName, task.id);
+    const parsedMessagesByFile = await this.strictParser.parseFiles(transcriptFiles);
+    const stream = await this.streamService.getTaskLogStream(teamName, task.id);
+
+    const toolNameByUseId = buildToolNameMap(parsedMessagesByFile);
+    const explicitExecutionKeys = new Set(
+      records
+        .filter((record) => record.linkKind === 'execution')
+        .map((record) => `${record.source.messageUuid}:${record.source.toolUseId ?? ''}`)
+    );
+    const workIntervals = Array.isArray(task.workIntervals) ? task.workIntervals : [];
+
+    const explicitParticipants: string[] = [];
+    const explicitToolNames: string[] = [];
+    for (const record of records) {
+      pushUnique(explicitParticipants, buildParticipantLabel(record));
+      pushUnique(explicitToolNames, record.action?.canonicalToolName);
+    }
+
+    let intervalToolResultTotal = 0;
+    let boardMcpToolResultTotal = 0;
+    let workerToolResultTotal = 0;
+    let explicitLinkedWorkerResultTotal = 0;
+    let missingExplicitWorkerResultTotal = 0;
+    const missingExplicitWorkerExamples: BoardTaskLogDiagnosticExample[] = [];
+
+    for (const [filePath, messages] of parsedMessagesByFile.entries()) {
+      for (const message of messages) {
+        if (message.type !== 'user' || message.toolResults.length === 0) {
+          continue;
+        }
+        if (!isWithinWorkIntervals(message.timestamp, workIntervals)) {
+          continue;
+        }
+
+        for (const toolResult of message.toolResults) {
+          intervalToolResultTotal += 1;
+          const toolName = toolNameByUseId.get(toolResult.toolUseId) ?? 'unknown tool';
+          if (isBoardMcpToolName(toolName)) {
+            boardMcpToolResultTotal += 1;
+            continue;
+          }
+
+          workerToolResultTotal += 1;
+          const explicitKey = `${message.uuid}:${toolResult.toolUseId}`;
+          if (explicitExecutionKeys.has(explicitKey)) {
+            explicitLinkedWorkerResultTotal += 1;
+            continue;
+          }
+
+          missingExplicitWorkerResultTotal += 1;
+          pushExample(missingExplicitWorkerExamples, {
+            timestamp: message.timestamp.toISOString(),
+            filePath,
+            messageUuid: message.uuid,
+            toolUseId: toolResult.toolUseId,
+            toolName,
+            isSidechain: message.isSidechain,
+            ...(message.agentId ? { agentId: message.agentId } : {}),
+          });
+        }
+      }
+    }
+
+    const diagnosis: string[] = [];
+    if (transcriptFiles.length === 0) {
+      diagnosis.push('No transcript files were found for this team.');
+    }
+    if (records.length === 0) {
+      diagnosis.push('No explicit task-linked activity records were found for this task.');
+    }
+    if (missingExplicitWorkerResultTotal > 0) {
+      diagnosis.push(
+        `Only board MCP actions are explicit for part of this task history. Found ${missingExplicitWorkerResultTotal} worker tool result(s) inside task work intervals without boardTaskLinks, so Task Log Stream cannot safely include them.`
+      );
+    }
+    if (
+      missingExplicitWorkerResultTotal > 0 &&
+      extractVisibleToolNames(stream).every((toolName) => isBoardMcpToolName(toolName))
+    ) {
+      diagnosis.push(
+        'Current stream visibility matches the data gap: the visible tools are MCP board actions, while worker tools exist in transcript but are unlinked.'
+      );
+    }
+
+    const emptyPayloadExamples = collectEmptyPayloadExamples(stream);
+    if (emptyPayloadExamples.length > 0) {
+      diagnosis.push(
+        `Found ${emptyPayloadExamples.length} tool result payload(s) with empty rendered content in the current stream. This explains empty success/output blocks.`
+      );
+    }
+    if (diagnosis.length === 0) {
+      diagnosis.push('No obvious task-log data gap was detected by diagnostics.');
+    }
+
+    return {
+      teamName,
+      requestedTaskRef: taskRef,
+      task: {
+        taskId: task.id,
+        displayId: getTaskDisplayId(task),
+        subject: task.subject,
+        status: task.status,
+        ...(task.owner ? { owner: task.owner } : {}),
+        workIntervals,
+      },
+      transcript: {
+        fileCount: transcriptFiles.length,
+        files: transcriptFiles,
+      },
+      explicitRecords: {
+        total: records.length,
+        execution: records.filter((record) => record.linkKind === 'execution').length,
+        lifecycle: records.filter((record) => record.linkKind === 'lifecycle').length,
+        boardAction: records.filter((record) => record.linkKind === 'board_action').length,
+        participants: explicitParticipants,
+        toolNames: explicitToolNames,
+      },
+      intervalToolResults: {
+        total: intervalToolResultTotal,
+        boardMcp: boardMcpToolResultTotal,
+        worker: {
+          total: workerToolResultTotal,
+          explicitLinked: explicitLinkedWorkerResultTotal,
+          missingExplicit: missingExplicitWorkerResultTotal,
+          examples: missingExplicitWorkerExamples,
+        },
+      },
+      stream: {
+        participants: stream.participants.map((participant) => participant.label),
+        defaultFilter: stream.defaultFilter,
+        segmentCount: stream.segments.length,
+        visibleToolNames: extractVisibleToolNames(stream),
+        emptyPayloadExamples,
+      },
+      diagnosis,
+    };
+  }
+}

src/main/services/team/taskLogs/discovery/TeamTranscriptSourceLocator.ts

@@ -0,0 +1,165 @@
+import { encodePath, extractBaseDir, getProjectsBasePath } from '@main/utils/pathDecoder';
+import { createLogger } from '@shared/utils/logger';
+import * as fs from 'fs/promises';
+import * as path from 'path';
+
+import { TeamConfigReader } from '../../TeamConfigReader';
+
+import type { TeamConfig } from '@shared/types';
+
+const logger = createLogger('Service:TeamTranscriptSourceLocator');
+
+function trimTrailingSlashes(value: string): string {
+  let end = value.length;
+  while (end > 0) {
+    const ch = value.charCodeAt(end - 1);
+    if (ch === 47 || ch === 92) {
+      end -= 1;
+      continue;
+    }
+    break;
+  }
+  return end === value.length ? value : value.slice(0, end);
+}
+
+export interface TeamTranscriptSourceContext {
+  projectDir: string;
+  projectId: string;
+  config: TeamConfig;
+  sessionIds: string[];
+  transcriptFiles: string[];
+}
+
+export class TeamTranscriptSourceLocator {
+  constructor(private readonly configReader: TeamConfigReader = new TeamConfigReader()) {}
+
+  async getContext(teamName: string): Promise<TeamTranscriptSourceContext | null> {
+    const config = await this.configReader.getConfig(teamName);
+    if (!config?.projectPath) {
+      return null;
+    }
+
+    const normalizedProjectPath = trimTrailingSlashes(config.projectPath);
+    let projectId = encodePath(normalizedProjectPath);
+    let projectDir = path.join(getProjectsBasePath(), extractBaseDir(projectId));
+
+    try {
+      const stat = await fs.stat(projectDir);
+      if (!stat.isDirectory()) {
+        throw new Error('not a directory');
+      }
+    } catch {
+      const leadSessionId =
+        typeof config.leadSessionId === 'string' && config.leadSessionId.trim().length > 0
+          ? config.leadSessionId.trim()
+          : null;
+      if (leadSessionId) {
+        try {
+          const projectEntries = await fs.readdir(getProjectsBasePath(), { withFileTypes: true });
+          for (const entry of projectEntries) {
+            if (!entry.isDirectory()) continue;
+            const candidateDir = path.join(getProjectsBasePath(), entry.name);
+            try {
+              await fs.access(path.join(candidateDir, `${leadSessionId}.jsonl`));
+              projectDir = candidateDir;
+              projectId = entry.name;
+              break;
+            } catch {
+              // not this project
+            }
+          }
+        } catch {
+          // best-effort fallback
+        }
+      }
+    }
+
+    const sessionIds = await this.discoverSessionIds(projectDir, config);
+    const transcriptFiles = await this.listTranscriptFilesForSessions(projectDir, sessionIds);
+    return { projectDir, projectId, config, sessionIds, transcriptFiles };
+  }
+
+  async listTranscriptFiles(teamName: string): Promise<string[]> {
+    const context = await this.getContext(teamName);
+    return context?.transcriptFiles ?? [];
+  }
+
+  private async discoverSessionIds(projectDir: string, config: TeamConfig): Promise<string[]> {
+    const knownSessionIds = new Set<string>();
+    if (typeof config.leadSessionId === 'string' && config.leadSessionId.trim().length > 0) {
+      knownSessionIds.add(config.leadSessionId.trim());
+    }
+    if (Array.isArray(config.sessionHistory)) {
+      for (const sessionId of config.sessionHistory) {
+        if (typeof sessionId === 'string' && sessionId.trim().length > 0) {
+          knownSessionIds.add(sessionId.trim());
+        }
+      }
+    }
+
+    let discoveredSessionDirs: string[] = [];
+    try {
+      const dirEntries = await fs.readdir(projectDir, { withFileTypes: true });
+      discoveredSessionDirs = dirEntries
+        .filter((entry) => entry.isDirectory())
+        .map((entry) => entry.name);
+    } catch {
+      logger.debug(`Cannot read transcript project dir: ${projectDir}`);
+    }
+
+    if (knownSessionIds.size === 0) {
+      return discoveredSessionDirs.sort();
+    }
+
+    const verifiedSessionIds: string[] = [];
+    for (const sessionId of knownSessionIds) {
+      try {
+        const stat = await fs.stat(path.join(projectDir, sessionId));
+        if (stat.isDirectory()) {
+          verifiedSessionIds.push(sessionId);
+        }
+      } catch {
+        // ignore stale config session
+      }
+    }
+
+    return Array.from(
+      new Set([...knownSessionIds, ...verifiedSessionIds, ...discoveredSessionDirs])
+    ).sort();
+  }
+
+  private async listTranscriptFilesForSessions(
+    projectDir: string,
+    sessionIds: string[]
+  ): Promise<string[]> {
+    const transcriptFiles = new Set<string>();
+
+    for (const sessionId of sessionIds) {
+      const mainTranscript = path.join(projectDir, `${sessionId}.jsonl`);
+      try {
+        const stat = await fs.stat(mainTranscript);
+        if (stat.isFile()) {
+          transcriptFiles.add(mainTranscript);
+        }
+      } catch {
+        // ignore missing root transcript
+      }
+
+      const subagentsDir = path.join(projectDir, sessionId, 'subagents');
+      try {
+        const dirEntries = await fs.readdir(subagentsDir, { withFileTypes: true });
+        for (const entry of dirEntries) {
+          if (!entry.isFile()) continue;
+          if (!entry.name.endsWith('.jsonl')) continue;
+          if (!entry.name.startsWith('agent-')) continue;
+          if (entry.name.startsWith('agent-acompact')) continue;
+          transcriptFiles.add(path.join(subagentsDir, entry.name));
+        }
+      } catch {
+        // ignore missing subagent dir
+      }
+    }
+
+    return [...transcriptFiles].sort();
+  }
+}

src/main/services/team/taskLogs/exact/BoardTaskExactLogChunkBuilder.ts

@@ -0,0 +1,11 @@
+import { ChunkBuilder } from '@main/services/analysis/ChunkBuilder';
+
+import type { EnhancedChunk, ParsedMessage } from '@main/types';
+
+export class BoardTaskExactLogChunkBuilder {
+  constructor(private readonly chunkBuilder: ChunkBuilder = new ChunkBuilder()) {}
+
+  buildBundleChunks(messages: ParsedMessage[]): EnhancedChunk[] {
+    return this.chunkBuilder.buildChunks(messages, [], { includeSidechain: true });
+  }
+}

src/main/services/team/taskLogs/exact/BoardTaskExactLogDetailSelector.ts

@@ -0,0 +1,364 @@
+import { extractToolCalls, extractToolResults } from '@main/utils/toolExtraction';
+import { createLogger } from '@shared/utils/logger';
+
+import type { ContentBlock, ParsedMessage } from '@main/types';
+import type { BoardTaskActivityRecord } from '../activity/BoardTaskActivityRecord';
+import type {
+  BoardTaskExactLogDetailCandidate,
+  BoardTaskExactLogBundleCandidate,
+} from './BoardTaskExactLogTypes';
+
+const logger = createLogger('Service:BoardTaskExactLogDetailSelector');
+
+interface TentativeFilteredMessage {
+  original: ParsedMessage;
+  filteredContent: ParsedMessage['content'];
+  matchedToolUseId?: string;
+}
+
+function isToolAnchoredOutputMessage(
+  message: ParsedMessage,
+  toolUseId: string | undefined
+): boolean {
+  return Boolean(toolUseId && message.sourceToolUseID === toolUseId);
+}
+
+function noteExactDiagnostic(
+  event: string,
+  details: Record<string, string | number | undefined> = {}
+): void {
+  const suffix = Object.entries(details)
+    .filter(([, value]) => value !== undefined)
+    .map(([key, value]) => `${key}=${String(value)}`)
+    .join(' ');
+
+  logger.debug(`[board_task_exact_logs.${event}]${suffix ? ` ${suffix}` : ''}`);
+}
+
+function keepExplicitTextualBlock(block: ContentBlock): boolean {
+  return block.type === 'text' || block.type === 'image';
+}
+
+function cloneBlock<T extends ContentBlock>(block: T): T {
+  if (block.type === 'tool_use') {
+    return {
+      ...block,
+      input: { ...(block.input ?? {}) },
+    } as T;
+  }
+
+  if (block.type === 'tool_result') {
+    return {
+      ...block,
+      content: Array.isArray(block.content)
+        ? block.content.map((child) => cloneBlock(child))
+        : block.content,
+    } as T;
+  }
+
+  if (block.type === 'image') {
+    return {
+      ...block,
+      source: { ...block.source },
+    } as T;
+  }
+
+  return { ...block } as T;
+}
+
+function filterAssistantContent(
+  content: ContentBlock[],
+  toolUseId: string | undefined,
+  explicitMessageLinked: boolean
+): ContentBlock[] {
+  const kept: ContentBlock[] = [];
+
+  for (const block of content) {
+    if (block.type === 'tool_use') {
+      if (toolUseId && block.id === toolUseId) {
+        kept.push(cloneBlock(block));
+      }
+      continue;
+    }
+
+    if (block.type === 'thinking') {
+      continue;
+    }
+
+    if (explicitMessageLinked && keepExplicitTextualBlock(block)) {
+      kept.push(cloneBlock(block));
+    }
+  }
+
+  return kept;
+}
+
+function filterUserArrayContent(
+  content: ContentBlock[],
+  toolUseId: string | undefined,
+  explicitMessageLinked: boolean
+): ContentBlock[] {
+  const kept: ContentBlock[] = [];
+
+  for (const block of content) {
+    if (block.type === 'tool_result') {
+      if (toolUseId && block.tool_use_id === toolUseId) {
+        kept.push(cloneBlock(block));
+      }
+      continue;
+    }
+
+    if (explicitMessageLinked && keepExplicitTextualBlock(block)) {
+      kept.push(cloneBlock(block));
+    }
+  }
+
+  return kept;
+}
+
+function filterMessageForCandidate(args: {
+  message: ParsedMessage;
+  candidate: BoardTaskExactLogBundleCandidate;
+  explicitMessageIds: Set<string>;
+}): TentativeFilteredMessage | null {
+  const { message, candidate, explicitMessageIds } = args;
+  const explicitMessageLinked = explicitMessageIds.has(message.uuid);
+  const toolUseId = candidate.anchor.kind === 'tool' ? candidate.anchor.toolUseId : undefined;
+  const anchoredOutputLinked = isToolAnchoredOutputMessage(message, toolUseId);
+
+  if (typeof message.content === 'string') {
+    if (!explicitMessageLinked && !anchoredOutputLinked) {
+      return null;
+    }
+    return {
+      original: message,
+      filteredContent: message.content,
+      ...(toolUseId ? { matchedToolUseId: toolUseId } : {}),
+    };
+  }
+
+  let filteredBlocks: ContentBlock[] = [];
+  if (message.type === 'assistant') {
+    filteredBlocks = filterAssistantContent(
+      message.content,
+      toolUseId,
+      explicitMessageLinked || anchoredOutputLinked
+    );
+  } else if (message.type === 'user') {
+    filteredBlocks = filterUserArrayContent(message.content, toolUseId, explicitMessageLinked);
+  } else {
+    filteredBlocks = explicitMessageLinked
+      ? message.content.filter(keepExplicitTextualBlock).map((block) => cloneBlock(block))
+      : [];
+  }
+
+  if (filteredBlocks.length === 0) {
+    return null;
+  }
+
+  return {
+    original: message,
+    filteredContent: filteredBlocks,
+    ...(toolUseId ? { matchedToolUseId: toolUseId } : {}),
+  };
+}
+
+function rebuildParsedMessage(
+  message: ParsedMessage,
+  filteredContent: ParsedMessage['content'],
+  keptAssistantUuids: Set<string>,
+  matchedToolUseId?: string
+): ParsedMessage {
+  const {
+    toolCalls: _originalToolCalls,
+    toolResults: _originalToolResults,
+    sourceToolUseID: _originalSourceToolUseID,
+    sourceToolAssistantUUID: _originalSourceToolAssistantUUID,
+    toolUseResult: _originalToolUseResult,
+    ...baseMessage
+  } = message;
+  const toolCalls = extractToolCalls(filteredContent);
+  const toolResults = extractToolResults(filteredContent);
+  const singleToolResult = toolResults.length === 1 ? toolResults[0] : undefined;
+  const matchedToolUseResultId =
+    message.toolUseResult &&
+    typeof message.toolUseResult.toolUseId === 'string' &&
+    message.toolUseResult.toolUseId === matchedToolUseId
+      ? matchedToolUseId
+      : undefined;
+  const matchedSourceToolUseId =
+    matchedToolUseId &&
+    (message.sourceToolUseID === matchedToolUseId ||
+      singleToolResult?.toolUseId === matchedToolUseId ||
+      matchedToolUseResultId === matchedToolUseId)
+      ? matchedToolUseId
+      : undefined;
+  const matchedSourceToolAssistantUUID =
+    matchedToolUseId &&
+    message.sourceToolAssistantUUID &&
+    keptAssistantUuids.has(message.sourceToolAssistantUUID)
+      ? message.sourceToolAssistantUUID
+      : undefined;
+  const toolUseResult =
+    matchedToolUseId &&
+    matchedSourceToolUseId === matchedToolUseId &&
+    singleToolResult?.toolUseId === matchedToolUseId
+      ? message.toolUseResult
+      : undefined;
+
+  return {
+    ...baseMessage,
+    content: filteredContent,
+    toolCalls,
+    toolResults,
+    ...(matchedSourceToolUseId ? { sourceToolUseID: matchedSourceToolUseId } : {}),
+    ...(matchedSourceToolAssistantUUID
+      ? { sourceToolAssistantUUID: matchedSourceToolAssistantUUID }
+      : {}),
+    ...(toolUseResult ? { toolUseResult } : {}),
+  };
+}
+
+function anchorEvidenceRank(message: ParsedMessage, toolUseId: string | undefined): number {
+  if (message.type !== 'assistant' || !toolUseId) {
+    return 0;
+  }
+
+  if (Array.isArray(message.content)) {
+    for (const block of message.content) {
+      if (block.type === 'tool_use' && block.id === toolUseId) {
+        return 2;
+      }
+    }
+  }
+
+  return message.sourceToolUseID === toolUseId ? 1 : 0;
+}
+
+function deduplicateAssistantMessagesByRequestId(
+  messages: ParsedMessage[],
+  toolUseId: string | undefined
+): ParsedMessage[] {
+  const preferredAssistantIndexByRequestId = new Map<string, number>();
+  for (let i = 0; i < messages.length; i++) {
+    const message = messages[i];
+    if (message.type === 'assistant' && message.requestId) {
+      const existingIndex = preferredAssistantIndexByRequestId.get(message.requestId);
+      if (existingIndex === undefined) {
+        preferredAssistantIndexByRequestId.set(message.requestId, i);
+        continue;
+      }
+
+      const existingRank = anchorEvidenceRank(messages[existingIndex]!, toolUseId);
+      const nextRank = anchorEvidenceRank(message, toolUseId);
+      if (nextRank > existingRank || (nextRank === existingRank && i > existingIndex)) {
+        preferredAssistantIndexByRequestId.set(message.requestId, i);
+      }
+    }
+  }
+
+  if (preferredAssistantIndexByRequestId.size === 0) {
+    return messages;
+  }
+
+  return messages.filter((message, index) => {
+    if (message.type !== 'assistant' || !message.requestId) {
+      return true;
+    }
+    return preferredAssistantIndexByRequestId.get(message.requestId) === index;
+  });
+}
+
+function sanitizeSourceAssistantLinks(messages: ParsedMessage[]): ParsedMessage[] {
+  const keptAssistantUuids = new Set(
+    messages.filter((message) => message.type === 'assistant').map((message) => message.uuid)
+  );
+
+  return messages.map((message) => {
+    if (
+      !message.sourceToolAssistantUUID ||
+      keptAssistantUuids.has(message.sourceToolAssistantUUID)
+    ) {
+      return message;
+    }
+
+    const { sourceToolAssistantUUID: _ignored, ...rest } = message;
+    return rest;
+  });
+}
+
+export class BoardTaskExactLogDetailSelector {
+  selectDetail(args: {
+    candidate: BoardTaskExactLogBundleCandidate;
+    records: BoardTaskActivityRecord[];
+    parsedMessagesByFile: Map<string, ParsedMessage[]>;
+  }): BoardTaskExactLogDetailCandidate | null {
+    const { candidate, records, parsedMessagesByFile } = args;
+    const relevantRecords = records.filter((record) =>
+      candidate.records.some((row) => row.id === record.id)
+    );
+    if (relevantRecords.length === 0) {
+      noteExactDiagnostic('missing_records_for_detail', { id: candidate.id });
+      return null;
+    }
+
+    const parsedMessages = parsedMessagesByFile.get(candidate.source.filePath);
+    if (!parsedMessages || parsedMessages.length === 0) {
+      noteExactDiagnostic('missing_parsed_messages', { filePath: candidate.source.filePath });
+      return null;
+    }
+
+    const explicitMessageIds = new Set(relevantRecords.map((record) => record.source.messageUuid));
+    const tentative: TentativeFilteredMessage[] = [];
+
+    for (const message of parsedMessages) {
+      const filtered = filterMessageForCandidate({
+        message,
+        candidate,
+        explicitMessageIds,
+      });
+      if (filtered) {
+        tentative.push(filtered);
+      }
+    }
+
+    if (tentative.length === 0) {
+      noteExactDiagnostic('empty_filtered_bundle', { id: candidate.id });
+      return null;
+    }
+
+    const keptAssistantUuids = new Set(
+      tentative
+        .filter((entry) => entry.original.type === 'assistant')
+        .map((entry) => entry.original.uuid)
+    );
+
+    const rebuilt = tentative.map((entry) =>
+      rebuildParsedMessage(
+        entry.original,
+        entry.filteredContent,
+        keptAssistantUuids,
+        entry.matchedToolUseId
+      )
+    );
+
+    const deduped = deduplicateAssistantMessagesByRequestId(
+      rebuilt,
+      candidate.anchor.kind === 'tool' ? candidate.anchor.toolUseId : undefined
+    );
+    const sanitized = sanitizeSourceAssistantLinks(deduped);
+    if (sanitized.length === 0) {
+      noteExactDiagnostic('empty_deduped_bundle', { id: candidate.id });
+      return null;
+    }
+
+    return {
+      id: candidate.id,
+      timestamp: candidate.timestamp,
+      actor: candidate.actor,
+      source: candidate.source,
+      records: candidate.records,
+      filteredMessages: sanitized,
+    };
+  }
+}

src/main/services/team/taskLogs/exact/BoardTaskExactLogDetailService.ts

@@ -0,0 +1,76 @@
+import { BoardTaskActivityRecordSource } from '../activity/BoardTaskActivityRecordSource';
+import { BoardTaskExactLogChunkBuilder } from './BoardTaskExactLogChunkBuilder';
+import { BoardTaskExactLogDetailSelector } from './BoardTaskExactLogDetailSelector';
+import { BoardTaskExactLogStrictParser } from './BoardTaskExactLogStrictParser';
+import { isBoardTaskExactLogsReadEnabled } from './featureGates';
+import { getBoardTaskExactLogFileVersions } from './fileVersions';
+import { BoardTaskExactLogSummarySelector } from './BoardTaskExactLogSummarySelector';
+
+import type { BoardTaskExactLogDetailResult } from '@shared/types';
+
+export class BoardTaskExactLogDetailService {
+  constructor(
+    private readonly recordSource: BoardTaskActivityRecordSource = new BoardTaskActivityRecordSource(),
+    private readonly summarySelector: BoardTaskExactLogSummarySelector = new BoardTaskExactLogSummarySelector(),
+    private readonly strictParser: BoardTaskExactLogStrictParser = new BoardTaskExactLogStrictParser(),
+    private readonly detailSelector: BoardTaskExactLogDetailSelector = new BoardTaskExactLogDetailSelector(),
+    private readonly chunkBuilder: BoardTaskExactLogChunkBuilder = new BoardTaskExactLogChunkBuilder()
+  ) {}
+
+  async getTaskExactLogDetail(
+    teamName: string,
+    taskId: string,
+    exactLogId: string,
+    expectedSourceGeneration: string
+  ): Promise<BoardTaskExactLogDetailResult> {
+    if (!isBoardTaskExactLogsReadEnabled()) {
+      return { status: 'missing' };
+    }
+
+    const records = await this.recordSource.getTaskRecords(teamName, taskId);
+    if (records.length === 0) {
+      return { status: 'missing' };
+    }
+
+    const fileVersionsByPath = await getBoardTaskExactLogFileVersions(
+      records.map((record) => record.source.filePath)
+    );
+
+    const candidate = this.summarySelector
+      .selectSummaries({
+        records,
+        fileVersionsByPath,
+      })
+      .find((item) => item.id === exactLogId);
+
+    if (!candidate) {
+      return { status: 'missing' };
+    }
+    if (!candidate.canLoadDetail) {
+      return { status: 'missing' };
+    }
+    if (candidate.sourceGeneration !== expectedSourceGeneration) {
+      return { status: 'stale' };
+    }
+
+    const parsedMessagesByFile = await this.strictParser.parseFiles([candidate.source.filePath]);
+    const detailCandidate = this.detailSelector.selectDetail({
+      candidate,
+      records,
+      parsedMessagesByFile,
+    });
+
+    if (!detailCandidate) {
+      return { status: 'missing' };
+    }
+
+    const chunks = this.chunkBuilder.buildBundleChunks(detailCandidate.filteredMessages);
+    return {
+      status: 'ok',
+      detail: {
+        id: detailCandidate.id,
+        chunks,
+      },
+    };
+  }
+}

src/main/services/team/taskLogs/exact/BoardTaskExactLogStrictParser.ts

@@ -0,0 +1,106 @@
+import { createLogger } from '@shared/utils/logger';
+import { createReadStream } from 'fs';
+import * as fs from 'fs/promises';
+import * as readline from 'readline';
+
+import { yieldToEventLoop } from '@main/utils/asyncYield';
+import { parseJsonlLine } from '@main/utils/jsonl';
+
+import { BoardTaskExactLogsParseCache } from './BoardTaskExactLogsParseCache';
+
+import type { ParsedMessage } from '@main/types';
+
+const logger = createLogger('Service:BoardTaskExactLogStrictParser');
+
+function asRecord(value: unknown): Record<string, unknown> | null {
+  return value && typeof value === 'object' ? (value as Record<string, unknown>) : null;
+}
+
+function hasStrictTimestamp(record: Record<string, unknown>): boolean {
+  if (typeof record.timestamp !== 'string' || record.timestamp.trim().length === 0) {
+    return false;
+  }
+  return Number.isFinite(Date.parse(record.timestamp));
+}
+
+export class BoardTaskExactLogStrictParser {
+  constructor(
+    private readonly cache: BoardTaskExactLogsParseCache = new BoardTaskExactLogsParseCache()
+  ) {}
+
+  async parseFiles(filePaths: string[]): Promise<Map<string, ParsedMessage[]>> {
+    const uniquePaths = [...new Set(filePaths)].sort();
+    this.cache.retainOnly(new Set(uniquePaths));
+
+    const results = await Promise.all(
+      uniquePaths.map(async (filePath) => [filePath, await this.parseFile(filePath)] as const)
+    );
+
+    return new Map(results);
+  }
+
+  private async parseFile(filePath: string): Promise<ParsedMessage[]> {
+    try {
+      const stat = await fs.stat(filePath);
+      const cached = this.cache.getIfFresh(filePath, stat.mtimeMs, stat.size);
+      if (cached) {
+        return cached;
+      }
+
+      const inFlight = this.cache.getInFlight(filePath);
+      if (inFlight) {
+        return inFlight;
+      }
+
+      const promise = this.readStrictFile(filePath);
+      this.cache.setInFlight(filePath, promise);
+      try {
+        const parsed = await promise;
+        this.cache.set(filePath, stat.mtimeMs, stat.size, parsed);
+        return parsed;
+      } finally {
+        this.cache.clearInFlight(filePath);
+      }
+    } catch (error) {
+      logger.debug(`Skipping unreadable exact-log transcript ${filePath}: ${String(error)}`);
+      this.cache.clearForPath(filePath);
+      return [];
+    }
+  }
+
+  private async readStrictFile(filePath: string): Promise<ParsedMessage[]> {
+    const results: ParsedMessage[] = [];
+    const stream = createReadStream(filePath, { encoding: 'utf8' });
+    const rl = readline.createInterface({
+      input: stream,
+      crlfDelay: Infinity,
+    });
+
+    let lineCount = 0;
+    for await (const line of rl) {
+      if (!line.trim()) continue;
+      lineCount += 1;
+
+      try {
+        const raw = JSON.parse(line) as unknown;
+        const record = asRecord(raw);
+        if (!record || !hasStrictTimestamp(record)) {
+          continue;
+        }
+
+        const parsed = parseJsonlLine(line);
+        if (parsed) {
+          results.push(parsed);
+        }
+      } catch (error) {
+        logger.debug(`Skipping malformed exact-log line in ${filePath}: ${String(error)}`);
+      }
+
+      if (lineCount % 250 === 0) {
+        await yieldToEventLoop();
+      }
+    }
+
+    return results;
+  }
+}

src/main/services/team/taskLogs/exact/BoardTaskExactLogSummarySelector.ts

@@ -0,0 +1,227 @@
+import { createHash } from 'crypto';
+
+import { describeBoardTaskActivityLabel } from '@shared/utils/boardTaskActivityLabels';
+import { createLogger } from '@shared/utils/logger';
+
+import type { BoardTaskActivityRecord } from '../activity/BoardTaskActivityRecord';
+import type {
+  BoardTaskExactLogAnchor,
+  BoardTaskExactLogBundleCandidate,
+  BoardTaskExactLogFileVersion,
+} from './BoardTaskExactLogTypes';
+
+const logger = createLogger('Service:BoardTaskExactLogSummarySelector');
+
+function noteExactDiagnostic(
+  event: string,
+  details: Record<string, string | number | undefined> = {}
+): void {
+  const suffix = Object.entries(details)
+    .filter(([, value]) => value !== undefined)
+    .map(([key, value]) => `${key}=${String(value)}`)
+    .join(' ');
+
+  logger.debug(`[board_task_exact_logs.${event}]${suffix ? ` ${suffix}` : ''}`);
+}
+
+function compareCandidateTimestamps(
+  left: BoardTaskActivityRecord,
+  right: BoardTaskActivityRecord
+): number {
+  const leftTs = Date.parse(left.timestamp);
+  const rightTs = Date.parse(right.timestamp);
+  if (Number.isFinite(leftTs) && Number.isFinite(rightTs) && leftTs !== rightTs) {
+    return leftTs - rightTs;
+  }
+  if (left.source.sourceOrder !== right.source.sourceOrder) {
+    return left.source.sourceOrder - right.source.sourceOrder;
+  }
+  return left.id.localeCompare(right.id);
+}
+
+function buildMessageGroupKey(record: BoardTaskActivityRecord): string {
+  return `${record.source.filePath}:${record.source.messageUuid}`;
+}
+
+function buildToolAnchor(
+  filePath: string,
+  messageUuid: string,
+  toolUseId: string
+): BoardTaskExactLogAnchor {
+  return {
+    kind: 'tool',
+    filePath,
+    messageUuid,
+    toolUseId,
+  };
+}
+
+function buildMessageAnchor(filePath: string, messageUuid: string): BoardTaskExactLogAnchor {
+  return {
+    kind: 'message',
+    filePath,
+    messageUuid,
+  };
+}
+
+function anchorId(anchor: BoardTaskExactLogAnchor): string {
+  return anchor.kind === 'tool'
+    ? `tool:${anchor.filePath}:${anchor.toolUseId ?? ''}`
+    : `message:${anchor.filePath}:${anchor.messageUuid}`;
+}
+
+function sourceGenerationFor(
+  anchor: BoardTaskExactLogAnchor,
+  version: BoardTaskExactLogFileVersion | undefined
+): string | null {
+  if (!version) return null;
+  const hash = createHash('sha1');
+  hash.update(anchor.filePath);
+  hash.update('\0');
+  hash.update(String(version.size));
+  hash.update('\0');
+  hash.update(String(version.mtimeMs));
+  return hash.digest('hex');
+}
+
+function chooseSummaryRecord(
+  records: BoardTaskActivityRecord[],
+  anchor: BoardTaskExactLogAnchor
+): BoardTaskActivityRecord | null {
+  if (records.length === 0) {
+    return null;
+  }
+
+  const anchoredRecords =
+    anchor.kind === 'tool' && anchor.toolUseId
+      ? records.filter(
+          (record) =>
+            record.source.toolUseId === anchor.toolUseId ||
+            record.action?.toolUseId === anchor.toolUseId
+        )
+      : records;
+  const candidates = anchoredRecords.length > 0 ? anchoredRecords : records;
+
+  return (
+    candidates.find((record) => record.action?.canonicalToolName) ??
+    candidates.find((record) => record.linkKind !== 'execution' && record.action) ??
+    candidates[0] ??
+    null
+  );
+}
+
+export class BoardTaskExactLogSummarySelector {
+  selectSummaries(args: {
+    records: BoardTaskActivityRecord[];
+    fileVersionsByPath: Map<string, BoardTaskExactLogFileVersion>;
+  }): BoardTaskExactLogBundleCandidate[] {
+    const byMessage = new Map<string, BoardTaskActivityRecord[]>();
+    for (const record of args.records) {
+      const key = buildMessageGroupKey(record);
+      const bucket = byMessage.get(key) ?? [];
+      bucket.push(record);
+      byMessage.set(key, bucket);
+    }
+
+    const groups = new Map<
+      string,
+      { anchor: BoardTaskExactLogAnchor; records: BoardTaskActivityRecord[] }
+    >();
+
+    for (const messageRecords of byMessage.values()) {
+      const sortedMessageRecords = [...messageRecords].sort(compareCandidateTimestamps);
+      const toolUseIds = [
+        ...new Set(sortedMessageRecords.map((record) => record.source.toolUseId).filter(Boolean)),
+      ] as string[];
+      const singleToolUseId = toolUseIds.length === 1 ? toolUseIds[0] : null;
+
+      for (const record of sortedMessageRecords) {
+        let anchor: BoardTaskExactLogAnchor;
+        if (record.source.toolUseId) {
+          anchor = buildToolAnchor(
+            record.source.filePath,
+            record.source.messageUuid,
+            record.source.toolUseId
+          );
+        } else if (singleToolUseId) {
+          anchor = buildToolAnchor(
+            record.source.filePath,
+            record.source.messageUuid,
+            singleToolUseId
+          );
+        } else {
+          anchor = buildMessageAnchor(record.source.filePath, record.source.messageUuid);
+        }
+
+        const key = anchorId(anchor);
+        const existing = groups.get(key);
+        if (existing) {
+          existing.records.push(record);
+        } else {
+          groups.set(key, { anchor, records: [record] });
+        }
+      }
+    }
+
+    const candidates: BoardTaskExactLogBundleCandidate[] = [];
+
+    for (const [key, group] of groups) {
+      const sortedRecords = [...group.records].sort(compareCandidateTimestamps);
+      const primaryRecord = sortedRecords[0];
+      if (!primaryRecord) {
+        continue;
+      }
+
+      const linkKinds = [...new Set(sortedRecords.map((record) => record.linkKind))];
+      const targetRoles = [...new Set(sortedRecords.map((record) => record.targetRole))];
+      const fileVersion = args.fileVersionsByPath.get(primaryRecord.source.filePath);
+      const sourceGeneration = sourceGenerationFor(group.anchor, fileVersion);
+      const summaryRecord = chooseSummaryRecord(sortedRecords, group.anchor) ?? primaryRecord;
+      const actionLabel = describeBoardTaskActivityLabel(summaryRecord);
+
+      const baseCandidate = {
+        id: key,
+        timestamp: primaryRecord.timestamp,
+        actor: primaryRecord.actor,
+        source: {
+          filePath: primaryRecord.source.filePath,
+          messageUuid: primaryRecord.source.messageUuid,
+          ...(group.anchor.kind === 'tool' && group.anchor.toolUseId
+            ? { toolUseId: group.anchor.toolUseId }
+            : {}),
+          sourceOrder: primaryRecord.source.sourceOrder,
+        },
+        records: sortedRecords,
+        anchor: group.anchor,
+        actionLabel,
+        ...(summaryRecord.action?.category
+          ? { actionCategory: summaryRecord.action.category }
+          : {}),
+        ...(summaryRecord.action?.canonicalToolName
+          ? { canonicalToolName: summaryRecord.action.canonicalToolName }
+          : {}),
+        linkKinds,
+        targetRoles,
+      };
+
+      if (sourceGeneration) {
+        candidates.push({
+          ...baseCandidate,
+          canLoadDetail: true,
+          sourceGeneration,
+        });
+      } else {
+        noteExactDiagnostic('non_expandable_summary', {
+          filePath: primaryRecord.source.filePath,
+          toolUseId: group.anchor.toolUseId,
+        });
+        candidates.push({
+          ...baseCandidate,
+          canLoadDetail: false,
+        });
+      }
+    }
+
+    return candidates;
+  }
+}

src/main/services/team/taskLogs/exact/BoardTaskExactLogTypes.ts

@@ -0,0 +1,77 @@
+import type { ParsedMessage } from '@main/types';
+import type {
+  BoardTaskActivityCategory,
+  BoardTaskActivityLinkKind,
+  BoardTaskActivityTargetRole,
+  BoardTaskExactLogActor,
+  BoardTaskExactLogSource,
+  BoardTaskExactLogSummary,
+} from '@shared/types';
+import type { BoardTaskActivityRecord } from '../activity/BoardTaskActivityRecord';
+
+export interface BoardTaskExactLogFileVersion {
+  filePath: string;
+  mtimeMs: number;
+  size: number;
+}
+
+export interface BoardTaskExactLogAnchor {
+  kind: 'tool' | 'message';
+  filePath: string;
+  messageUuid: string;
+  toolUseId?: string;
+}
+
+export type BoardTaskExactLogBundleCandidate = {
+  id: string;
+  timestamp: string;
+  actor: BoardTaskExactLogActor;
+  source: BoardTaskExactLogSource;
+  records: BoardTaskActivityRecord[];
+  anchor: BoardTaskExactLogAnchor;
+  actionLabel: string;
+  actionCategory?: BoardTaskActivityCategory;
+  canonicalToolName?: string;
+  linkKinds: BoardTaskActivityLinkKind[];
+  targetRoles: BoardTaskActivityTargetRole[];
+} & ({ canLoadDetail: true; sourceGeneration: string } | { canLoadDetail: false });
+
+export interface BoardTaskExactLogDetailCandidate {
+  id: string;
+  timestamp: string;
+  actor: BoardTaskExactLogActor;
+  source: BoardTaskExactLogSource;
+  records: BoardTaskActivityRecord[];
+  filteredMessages: ParsedMessage[];
+}
+
+export function mapCandidateToSummary(
+  candidate: BoardTaskExactLogBundleCandidate
+): BoardTaskExactLogSummary {
+  return candidate.canLoadDetail
+    ? {
+        id: candidate.id,
+        timestamp: candidate.timestamp,
+        actor: candidate.actor,
+        source: candidate.source,
+        anchorKind: candidate.anchor.kind,
+        actionLabel: candidate.actionLabel,
+        ...(candidate.actionCategory ? { actionCategory: candidate.actionCategory } : {}),
+        ...(candidate.canonicalToolName ? { canonicalToolName: candidate.canonicalToolName } : {}),
+        linkKinds: candidate.linkKinds,
+        canLoadDetail: true,
+        sourceGeneration: candidate.sourceGeneration,
+      }
+    : {
+        id: candidate.id,
+        timestamp: candidate.timestamp,
+        actor: candidate.actor,
+        source: candidate.source,
+        anchorKind: candidate.anchor.kind,
+        actionLabel: candidate.actionLabel,
+        ...(candidate.actionCategory ? { actionCategory: candidate.actionCategory } : {}),
+        ...(candidate.canonicalToolName ? { canonicalToolName: candidate.canonicalToolName } : {}),
+        linkKinds: candidate.linkKinds,
+        canLoadDetail: false,
+      };
+}

src/main/services/team/taskLogs/exact/BoardTaskExactLogsParseCache.ts

@@ -0,0 +1,35 @@
+import { BoardTaskActivityParseCache } from '../activity/BoardTaskActivityParseCache';
+
+import type { ParsedMessage } from '@main/types';
+
+export class BoardTaskExactLogsParseCache {
+  private readonly cache = new BoardTaskActivityParseCache<ParsedMessage[]>();
+
+  getIfFresh(filePath: string, mtimeMs: number, size: number): ParsedMessage[] | null {
+    return this.cache.getIfFresh(filePath, mtimeMs, size);
+  }
+
+  getInFlight(filePath: string): Promise<ParsedMessage[]> | null {
+    return this.cache.getInFlight(filePath);
+  }
+
+  setInFlight(filePath: string, promise: Promise<ParsedMessage[]>): void {
+    this.cache.setInFlight(filePath, promise);
+  }
+
+  clearInFlight(filePath: string): void {
+    this.cache.clearInFlight(filePath);
+  }
+
+  set(filePath: string, mtimeMs: number, size: number, value: ParsedMessage[]): void {
+    this.cache.set(filePath, mtimeMs, size, value);
+  }
+
+  clearForPath(filePath: string): void {
+    this.cache.clearForPath(filePath);
+  }
+
+  retainOnly(filePaths: Set<string>): void {
+    this.cache.retainOnly(filePaths);
+  }
+}

src/main/services/team/taskLogs/exact/BoardTaskExactLogsService.ts

@@ -0,0 +1,63 @@
+import { BoardTaskActivityRecordSource } from '../activity/BoardTaskActivityRecordSource';
+import { isBoardTaskExactLogsReadEnabled } from './featureGates';
+import { getBoardTaskExactLogFileVersions } from './fileVersions';
+import { BoardTaskExactLogSummarySelector } from './BoardTaskExactLogSummarySelector';
+import { mapCandidateToSummary } from './BoardTaskExactLogTypes';
+
+import type { BoardTaskExactLogSummariesResponse } from '@shared/types';
+
+function compareSummaries(
+  left: BoardTaskExactLogSummariesResponse['items'][number],
+  right: BoardTaskExactLogSummariesResponse['items'][number]
+): number {
+  const leftTs = Date.parse(left.timestamp);
+  const rightTs = Date.parse(right.timestamp);
+  if (Number.isFinite(leftTs) && Number.isFinite(rightTs) && leftTs !== rightTs) {
+    return leftTs - rightTs;
+  }
+  if (left.source.filePath !== right.source.filePath) {
+    return left.source.filePath.localeCompare(right.source.filePath);
+  }
+  if (left.source.sourceOrder !== right.source.sourceOrder) {
+    return left.source.sourceOrder - right.source.sourceOrder;
+  }
+  if ((left.source.toolUseId ?? '') !== (right.source.toolUseId ?? '')) {
+    return (left.source.toolUseId ?? '').localeCompare(right.source.toolUseId ?? '');
+  }
+  return left.id.localeCompare(right.id);
+}
+
+export class BoardTaskExactLogsService {
+  constructor(
+    private readonly recordSource: BoardTaskActivityRecordSource = new BoardTaskActivityRecordSource(),
+    private readonly summarySelector: BoardTaskExactLogSummarySelector = new BoardTaskExactLogSummarySelector()
+  ) {}
+
+  async getTaskExactLogSummaries(
+    teamName: string,
+    taskId: string
+  ): Promise<BoardTaskExactLogSummariesResponse> {
+    if (!isBoardTaskExactLogsReadEnabled()) {
+      return { items: [] };
+    }
+
+    const records = await this.recordSource.getTaskRecords(teamName, taskId);
+    if (records.length === 0) {
+      return { items: [] };
+    }
+
+    const fileVersionsByPath = await getBoardTaskExactLogFileVersions(
+      records.map((record) => record.source.filePath)
+    );
+
+    const items = this.summarySelector
+      .selectSummaries({
+        records,
+        fileVersionsByPath,
+      })
+      .map(mapCandidateToSummary)
+      .sort(compareSummaries);
+
+    return { items };
+  }
+}

src/main/services/team/taskLogs/exact/featureGates.ts

@@ -0,0 +1,18 @@
+function readEnabledFlag(value: string | undefined, defaultValue: boolean): boolean {
+  if (value == null) {
+    return defaultValue;
+  }
+
+  const normalized = value.trim().toLowerCase();
+  if (normalized === '0' || normalized === 'false' || normalized === 'off' || normalized === 'no') {
+    return false;
+  }
+  if (normalized === '1' || normalized === 'true' || normalized === 'on' || normalized === 'yes') {
+    return true;
+  }
+  return defaultValue;
+}
+
+export function isBoardTaskExactLogsReadEnabled(): boolean {
+  return readEnabledFlag(process.env.CLAUDE_TEAM_BOARD_TASK_EXACT_LOGS_READ_ENABLED, true);
+}

src/main/services/team/taskLogs/exact/fileVersions.ts

@@ -0,0 +1,33 @@
+import * as fs from 'fs/promises';
+
+import type { BoardTaskExactLogFileVersion } from './BoardTaskExactLogTypes';
+
+export async function getBoardTaskExactLogFileVersions(
+  filePaths: Iterable<string>
+): Promise<Map<string, BoardTaskExactLogFileVersion>> {
+  const uniqueFilePaths = [...new Set(filePaths)];
+  const results = await Promise.all(
+    uniqueFilePaths.map(async (filePath) => {
+      try {
+        const stat = await fs.stat(filePath);
+        if (!stat.isFile()) {
+          return null;
+        }
+        return {
+          filePath,
+          mtimeMs: stat.mtimeMs,
+          size: stat.size,
+        } satisfies BoardTaskExactLogFileVersion;
+      } catch {
+        return null;
+      }
+    })
+  );
+
+  const byPath = new Map<string, BoardTaskExactLogFileVersion>();
+  for (const item of results) {
+    if (!item) continue;
+    byPath.set(item.filePath, item);
+  }
+  return byPath;
+}

src/main/services/team/taskLogs/stream/BoardTaskLogStreamService.ts

@@ -0,0 +1,858 @@
+import { extractToolCalls, extractToolResults } from '@main/utils/toolExtraction';
+
+import { BoardTaskActivityRecordSource } from '../activity/BoardTaskActivityRecordSource';
+import { BoardTaskExactLogChunkBuilder } from '../exact/BoardTaskExactLogChunkBuilder';
+import { BoardTaskExactLogDetailSelector } from '../exact/BoardTaskExactLogDetailSelector';
+import { BoardTaskExactLogStrictParser } from '../exact/BoardTaskExactLogStrictParser';
+import { isBoardTaskExactLogsReadEnabled } from '../exact/featureGates';
+import { getBoardTaskExactLogFileVersions } from '../exact/fileVersions';
+import { BoardTaskExactLogSummarySelector } from '../exact/BoardTaskExactLogSummarySelector';
+
+import type { ContentBlock, ParsedMessage, ToolUseResultData } from '@main/types';
+import type {
+  BoardTaskActivityCategory,
+  BoardTaskLogActor,
+  BoardTaskLogParticipant,
+  BoardTaskLogSegment,
+  BoardTaskLogStreamResponse,
+} from '@shared/types';
+import type { BoardTaskExactLogDetailCandidate } from '../exact/BoardTaskExactLogTypes';
+
+interface StreamSlice {
+  id: string;
+  timestamp: string;
+  filePath: string;
+  participantKey: string;
+  actor: BoardTaskLogActor;
+  actionCategory?: BoardTaskActivityCategory;
+  filteredMessages: ParsedMessage[];
+}
+
+interface MergedMessageAccumulator {
+  message: ParsedMessage;
+  content: ParsedMessage['content'];
+  firstSeenOrder: number;
+  sourceToolUseIds: Set<string>;
+  sourceToolAssistantUUIDs: Set<string>;
+  toolUseResults: ToolUseResultData[];
+}
+
+function emptyResponse(): BoardTaskLogStreamResponse {
+  return {
+    participants: [],
+    defaultFilter: 'all',
+    segments: [],
+  };
+}
+
+function normalizeMemberName(value: string): string {
+  return value.trim().toLowerCase();
+}
+
+function toStreamActor(detail: BoardTaskExactLogDetailCandidate['actor']): BoardTaskLogActor {
+  return {
+    ...(detail.memberName ? { memberName: detail.memberName } : {}),
+    role: detail.role,
+    sessionId: detail.sessionId,
+    ...(detail.agentId ? { agentId: detail.agentId } : {}),
+    isSidechain: detail.isSidechain,
+  };
+}
+
+function buildParticipantKey(actor: BoardTaskLogActor): string {
+  if (actor.memberName) {
+    return `member:${normalizeMemberName(actor.memberName)}`;
+  }
+  if (!actor.isSidechain || actor.role === 'lead') {
+    return 'lead';
+  }
+  if (actor.agentId) {
+    return `sidechain-agent:${actor.agentId}`;
+  }
+  return `sidechain-session:${actor.sessionId}`;
+}
+
+function buildParticipantLabel(actor: BoardTaskLogActor): string {
+  if (actor.memberName) {
+    return actor.memberName;
+  }
+  if (!actor.isSidechain || actor.role === 'lead') {
+    return 'lead session';
+  }
+  if (actor.agentId) {
+    return `member ${actor.agentId.slice(0, 8)}`;
+  }
+  return `member session ${actor.sessionId.slice(0, 8)}`;
+}
+
+function buildParticipant(
+  actor: BoardTaskLogActor,
+  participantKey: string
+): BoardTaskLogParticipant {
+  return {
+    key: participantKey,
+    label: buildParticipantLabel(actor),
+    role: actor.role,
+    isLead: participantKey === 'lead',
+    isSidechain: actor.isSidechain,
+  };
+}
+
+function hasNamedParticipant(actor: BoardTaskLogActor): boolean {
+  return typeof actor.memberName === 'string' && actor.memberName.trim().length > 0;
+}
+
+function hasToolUseBlock(
+  content: ParsedMessage['content'],
+  toolUseId: string | undefined
+): boolean {
+  if (!toolUseId || typeof content === 'string') {
+    return false;
+  }
+
+  return content.some((block) => block.type === 'tool_use' && block.id === toolUseId);
+}
+
+function looksLikeJsonPayload(value: string): boolean {
+  const trimmed = value.trim();
+  return trimmed.startsWith('{') || trimmed.startsWith('[');
+}
+
+function parseJsonLikeString(value: string): unknown {
+  const trimmed = value.trim();
+  if (!looksLikeJsonPayload(trimmed)) {
+    return null;
+  }
+
+  try {
+    return JSON.parse(trimmed);
+  } catch {
+    return null;
+  }
+}
+
+function extractBoardToolOutputText(
+  toolName: string | undefined,
+  parsedPayload: unknown
+): string | null {
+  if (!toolName || !parsedPayload || typeof parsedPayload !== 'object') {
+    return null;
+  }
+
+  const payload = parsedPayload as Record<string, unknown>;
+  if (toolName === 'task_add_comment' || toolName === 'task_get_comment') {
+    const comment = payload.comment as Record<string, unknown> | undefined;
+    if (typeof comment?.text === 'string' && comment.text.trim().length > 0) {
+      return comment.text;
+    }
+  }
+
+  return null;
+}
+
+function collectTextBlockText(value: unknown): string {
+  if (!Array.isArray(value)) {
+    return '';
+  }
+
+  return value
+    .filter(
+      (child): child is Extract<ContentBlock, { type: 'text' }> =>
+        typeof child === 'object' &&
+        child !== null &&
+        'type' in child &&
+        child.type === 'text' &&
+        'text' in child &&
+        typeof child.text === 'string'
+    )
+    .map((child) => child.text)
+    .join('\n');
+}
+
+function isEmptyToolPayload(value: unknown): boolean {
+  if (value == null) {
+    return true;
+  }
+  if (typeof value === 'string') {
+    return value.trim().length === 0;
+  }
+  if (Array.isArray(value)) {
+    return value.length === 0;
+  }
+  return false;
+}
+
+function inferSingleToolUseId(message: ParsedMessage): string | undefined {
+  if (message.sourceToolUseID) {
+    return message.sourceToolUseID;
+  }
+
+  if (message.toolResults.length === 1) {
+    return message.toolResults[0]?.toolUseId;
+  }
+
+  if (!Array.isArray(message.content)) {
+    return undefined;
+  }
+
+  const uniqueIds = new Set(
+    message.content
+      .filter(
+        (block): block is Extract<ContentBlock, { type: 'tool_result' }> =>
+          block.type === 'tool_result'
+      )
+      .map((block) => block.tool_use_id)
+  );
+
+  return uniqueIds.size === 1 ? uniqueIds.values().next().value : undefined;
+}
+
+function sanitizeToolResultContent(
+  content: ContentBlock,
+  canonicalToolName?: string
+): ContentBlock {
+  if (content.type !== 'tool_result') {
+    return cloneBlock(content);
+  }
+
+  if (typeof content.content === 'string') {
+    const parsedPayload = parseJsonLikeString(content.content);
+    const extractedText = extractBoardToolOutputText(canonicalToolName, parsedPayload);
+    if (typeof extractedText === 'string') {
+      return {
+        ...content,
+        content: [{ type: 'text', text: extractedText }],
+      };
+    }
+    return parsedPayload ? { ...content, content: '' } : cloneBlock(content);
+  }
+
+  if (!Array.isArray(content.content)) {
+    return cloneBlock(content);
+  }
+
+  const jsonText = content.content
+    .filter((child): child is Extract<ContentBlock, { type: 'text' }> => child.type === 'text')
+    .map((child) => child.text)
+    .join('\n');
+  const parsedPayload = parseJsonLikeString(jsonText);
+  const extractedText = extractBoardToolOutputText(canonicalToolName, parsedPayload);
+  if (typeof extractedText === 'string') {
+    return {
+      ...content,
+      content: extractedText,
+    };
+  }
+
+  const sanitizedChildren = content.content
+    .map((child) => {
+      if (child.type !== 'text') {
+        return cloneBlock(child);
+      }
+
+      return looksLikeJsonPayload(child.text) ? null : cloneBlock(child);
+    })
+    .filter((child): child is ContentBlock => child !== null);
+
+  if (sanitizedChildren.length === 0) {
+    return {
+      ...content,
+      content: '',
+    };
+  }
+
+  return {
+    ...content,
+    content: sanitizedChildren,
+  };
+}
+
+function sanitizeJsonLikeToolResultPayloads(
+  messages: ParsedMessage[],
+  canonicalToolName?: string
+): ParsedMessage[] {
+  return messages.map((message) => {
+    let nextMessage = message;
+
+    const rawToolUseResult = message.toolUseResult as unknown;
+    if (
+      rawToolUseResult &&
+      typeof rawToolUseResult === 'object' &&
+      !Array.isArray(rawToolUseResult)
+    ) {
+      const nextToolUseResult: Record<string, unknown> & {
+        content?: unknown;
+        message?: unknown;
+      } = { ...(rawToolUseResult as Record<string, unknown>) };
+      let toolUseResultChanged = false;
+      const extractedFromContent =
+        typeof nextToolUseResult.content === 'string'
+          ? extractBoardToolOutputText(
+              canonicalToolName,
+              parseJsonLikeString(nextToolUseResult.content)
+            )
+          : null;
+      const extractedFromMessage =
+        typeof nextToolUseResult.message === 'string'
+          ? extractBoardToolOutputText(
+              canonicalToolName,
+              parseJsonLikeString(nextToolUseResult.message)
+            )
+          : null;
+
+      if (typeof extractedFromContent === 'string') {
+        nextToolUseResult.content = extractedFromContent;
+        toolUseResultChanged = true;
+      }
+
+      if (
+        typeof nextToolUseResult.content === 'string' &&
+        looksLikeJsonPayload(nextToolUseResult.content)
+      ) {
+        nextToolUseResult.content = '';
+        toolUseResultChanged = true;
+      }
+
+      if (typeof extractedFromMessage === 'string') {
+        nextToolUseResult.message = extractedFromMessage;
+        toolUseResultChanged = true;
+      }
+
+      if (
+        typeof nextToolUseResult.message === 'string' &&
+        looksLikeJsonPayload(nextToolUseResult.message)
+      ) {
+        nextToolUseResult.message = '';
+        toolUseResultChanged = true;
+      }
+
+      if (toolUseResultChanged) {
+        nextMessage = {
+          ...nextMessage,
+          toolUseResult: nextToolUseResult,
+        };
+      }
+    } else if (Array.isArray(rawToolUseResult)) {
+      const toolUseId = inferSingleToolUseId(message);
+      const jsonText = collectTextBlockText(rawToolUseResult);
+      const parsedPayload = parseJsonLikeString(jsonText);
+      const extractedText = extractBoardToolOutputText(canonicalToolName, parsedPayload);
+      if (typeof extractedText === 'string' || parsedPayload) {
+        nextMessage = {
+          ...nextMessage,
+          toolUseResult: {
+            ...(toolUseId ? { toolUseId } : {}),
+            content: typeof extractedText === 'string' ? extractedText : '',
+          },
+        };
+      }
+    }
+
+    if (typeof message.content === 'string') {
+      return nextMessage;
+    }
+
+    let changed = false;
+    const nextContent = message.content.map((block) => {
+      if (block.type !== 'tool_result') {
+        return block;
+      }
+
+      const sanitized = sanitizeToolResultContent(block, canonicalToolName);
+      if (JSON.stringify(sanitized) !== JSON.stringify(block)) {
+        changed = true;
+      }
+      return sanitized;
+    });
+
+    if (!changed) {
+      return nextMessage;
+    }
+
+    return {
+      ...nextMessage,
+      content: nextContent,
+    };
+  });
+}
+
+function hasMeaningfulToolUseResult(message: ParsedMessage): boolean {
+  const rawToolUseResult = message.toolUseResult as unknown;
+  if (
+    !rawToolUseResult ||
+    typeof rawToolUseResult !== 'object' ||
+    Array.isArray(rawToolUseResult)
+  ) {
+    return false;
+  }
+
+  const toolUseResult = rawToolUseResult as {
+    error?: unknown;
+    stderr?: unknown;
+    content?: unknown;
+    message?: unknown;
+  };
+  if (typeof toolUseResult.error === 'string' && toolUseResult.error.trim().length > 0) {
+    return true;
+  }
+  if (typeof toolUseResult.stderr === 'string' && toolUseResult.stderr.trim().length > 0) {
+    return true;
+  }
+  if (typeof toolUseResult.content === 'string' && toolUseResult.content.trim().length > 0) {
+    return true;
+  }
+  if (Array.isArray(toolUseResult.content) && toolUseResult.content.length > 0) {
+    return true;
+  }
+  if (typeof toolUseResult.message === 'string' && toolUseResult.message.trim().length > 0) {
+    return true;
+  }
+  if (Array.isArray(toolUseResult.message) && toolUseResult.message.length > 0) {
+    return true;
+  }
+  return false;
+}
+
+function pruneEmptyInternalToolResultMessages(messages: ParsedMessage[]): ParsedMessage[] {
+  return messages.filter((message) => {
+    if (
+      message.type !== 'user' ||
+      message.toolResults.length === 0 ||
+      typeof message.content === 'string'
+    ) {
+      return true;
+    }
+
+    const hasNonToolResultContent = message.content.some((block) => block.type !== 'tool_result');
+    if (hasNonToolResultContent) {
+      return true;
+    }
+
+    const allToolResultsEmpty = message.toolResults.every((toolResult) =>
+      isEmptyToolPayload(toolResult.content)
+    );
+    if (!allToolResultsEmpty) {
+      return true;
+    }
+
+    return hasMeaningfulToolUseResult(message);
+  });
+}
+
+function pruneToolAnchoredAssistantOutputMessages(
+  messages: ParsedMessage[],
+  toolUseId: string | undefined
+): ParsedMessage[] {
+  if (!toolUseId) {
+    return messages;
+  }
+
+  return messages.filter((message) => {
+    if (message.type !== 'assistant') {
+      return true;
+    }
+    if (message.sourceToolUseID !== toolUseId) {
+      return true;
+    }
+    return hasToolUseBlock(message.content, toolUseId);
+  });
+}
+
+function filterReadOnlySlices(slices: StreamSlice[]): StreamSlice[] {
+  const participantHasNonRead = new Map<string, boolean>();
+
+  for (const slice of slices) {
+    if (slice.actionCategory && slice.actionCategory !== 'read') {
+      participantHasNonRead.set(slice.participantKey, true);
+    }
+  }
+
+  return slices.filter((slice) => {
+    const hasNonReadForParticipant = participantHasNonRead.get(slice.participantKey) === true;
+    if (!hasNonReadForParticipant) {
+      return true;
+    }
+    return slice.actionCategory !== 'read';
+  });
+}
+
+function compareCandidates(
+  left: {
+    id: string;
+    timestamp: string;
+    source: { filePath: string; sourceOrder: number; toolUseId?: string };
+  },
+  right: {
+    id: string;
+    timestamp: string;
+    source: { filePath: string; sourceOrder: number; toolUseId?: string };
+  }
+): number {
+  const leftTs = Date.parse(left.timestamp);
+  const rightTs = Date.parse(right.timestamp);
+  if (Number.isFinite(leftTs) && Number.isFinite(rightTs) && leftTs !== rightTs) {
+    return leftTs - rightTs;
+  }
+  if (left.source.filePath !== right.source.filePath) {
+    return left.source.filePath.localeCompare(right.source.filePath);
+  }
+  if (left.source.sourceOrder !== right.source.sourceOrder) {
+    return left.source.sourceOrder - right.source.sourceOrder;
+  }
+  if ((left.source.toolUseId ?? '') !== (right.source.toolUseId ?? '')) {
+    return (left.source.toolUseId ?? '').localeCompare(right.source.toolUseId ?? '');
+  }
+  return left.id.localeCompare(right.id);
+}
+
+function blockKey(block: ContentBlock): string {
+  return JSON.stringify(block);
+}
+
+function cloneBlock<T extends ContentBlock>(block: T): T {
+  if (block.type === 'tool_use') {
+    return {
+      ...block,
+      input: { ...(block.input ?? {}) },
+    } as T;
+  }
+
+  if (block.type === 'tool_result') {
+    return {
+      ...block,
+      content: Array.isArray(block.content)
+        ? block.content.map((child) => cloneBlock(child))
+        : block.content,
+    } as T;
+  }
+
+  if (block.type === 'image') {
+    return {
+      ...block,
+      source: { ...block.source },
+    } as T;
+  }
+
+  return { ...block } as T;
+}
+
+function cloneMessageContent(content: ParsedMessage['content']): ParsedMessage['content'] {
+  if (typeof content === 'string') {
+    return content;
+  }
+  return content.map((block) => cloneBlock(block));
+}
+
+function mergeMessageContent(
+  current: ParsedMessage['content'],
+  incoming: ParsedMessage['content']
+): ParsedMessage['content'] {
+  if (typeof current === 'string') {
+    return current;
+  }
+  if (typeof incoming === 'string') {
+    return current;
+  }
+
+  const merged = current.map((block) => cloneBlock(block));
+  const seen = new Set(merged.map((block) => blockKey(block)));
+  for (const block of incoming) {
+    const key = blockKey(block);
+    if (seen.has(key)) continue;
+    merged.push(cloneBlock(block));
+    seen.add(key);
+  }
+  return merged;
+}
+
+function createAccumulator(
+  message: ParsedMessage,
+  firstSeenOrder: number
+): MergedMessageAccumulator {
+  return {
+    message,
+    content: cloneMessageContent(message.content),
+    firstSeenOrder,
+    sourceToolUseIds: new Set(message.sourceToolUseID ? [message.sourceToolUseID] : []),
+    sourceToolAssistantUUIDs: new Set(
+      message.sourceToolAssistantUUID ? [message.sourceToolAssistantUUID] : []
+    ),
+    toolUseResults: message.toolUseResult ? [message.toolUseResult] : [],
+  };
+}
+
+function updateAccumulator(accumulator: MergedMessageAccumulator, message: ParsedMessage): void {
+  accumulator.content = mergeMessageContent(accumulator.content, message.content);
+  if (message.sourceToolUseID) {
+    accumulator.sourceToolUseIds.add(message.sourceToolUseID);
+  }
+  if (message.sourceToolAssistantUUID) {
+    accumulator.sourceToolAssistantUUIDs.add(message.sourceToolAssistantUUID);
+  }
+  if (message.toolUseResult) {
+    accumulator.toolUseResults.push(message.toolUseResult);
+  }
+}
+
+function selectSingleValue(values: Set<string>): string | undefined {
+  if (values.size !== 1) return undefined;
+  return values.values().next().value;
+}
+
+function selectSingleToolUseResult(values: ToolUseResultData[]): ToolUseResultData | undefined {
+  if (values.length !== 1) return undefined;
+  return values[0];
+}
+
+function extractToolUseIdFromToolUseResult(
+  value: ToolUseResultData | undefined
+): string | undefined {
+  if (!value || typeof value.toolUseId !== 'string') {
+    return undefined;
+  }
+  const trimmed = value.toolUseId.trim();
+  return trimmed.length > 0 ? trimmed : undefined;
+}
+
+function rebuildMergedMessage(
+  accumulator: MergedMessageAccumulator,
+  keptAssistantUuids: Set<string>
+): ParsedMessage {
+  const {
+    toolCalls: _toolCalls,
+    toolResults: _toolResults,
+    sourceToolUseID: _sourceToolUseID,
+    sourceToolAssistantUUID: _sourceToolAssistantUUID,
+    toolUseResult: _toolUseResult,
+    ...base
+  } = accumulator.message;
+
+  const toolCalls = extractToolCalls(accumulator.content);
+  const toolResults = extractToolResults(accumulator.content);
+  const singleToolUseResult = selectSingleToolUseResult(accumulator.toolUseResults);
+  const derivedToolUseId =
+    selectSingleValue(accumulator.sourceToolUseIds) ??
+    (toolResults.length === 1 ? toolResults[0]?.toolUseId : undefined) ??
+    extractToolUseIdFromToolUseResult(singleToolUseResult);
+  const sourceToolAssistantUUID = selectSingleValue(accumulator.sourceToolAssistantUUIDs);
+  const preservedSourceToolAssistantUUID =
+    sourceToolAssistantUUID && keptAssistantUuids.has(sourceToolAssistantUUID)
+      ? sourceToolAssistantUUID
+      : undefined;
+  const toolUseResult = singleToolUseResult;
+
+  return {
+    ...base,
+    content: accumulator.content,
+    toolCalls,
+    toolResults,
+    ...(derivedToolUseId ? { sourceToolUseID: derivedToolUseId } : {}),
+    ...(preservedSourceToolAssistantUUID
+      ? { sourceToolAssistantUUID: preservedSourceToolAssistantUUID }
+      : {}),
+    ...(toolUseResult ? { toolUseResult } : {}),
+  };
+}
+
+function mergeMessages(
+  details: Array<{ filePath: string; filteredMessages: ParsedMessage[] }>
+): ParsedMessage[] {
+  const byMessageKey = new Map<string, MergedMessageAccumulator>();
+  let order = 0;
+
+  for (const detail of details) {
+    for (const message of detail.filteredMessages) {
+      const key = `${detail.filePath}:${message.uuid}`;
+      const existing = byMessageKey.get(key);
+      if (existing) {
+        updateAccumulator(existing, message);
+      } else {
+        byMessageKey.set(key, createAccumulator(message, order));
+        order += 1;
+      }
+    }
+  }
+
+  const mergedAccumulators = [...byMessageKey.values()].sort(
+    (left, right) => left.firstSeenOrder - right.firstSeenOrder
+  );
+  const keptAssistantUuids = new Set(
+    mergedAccumulators
+      .filter((entry) => entry.message.type === 'assistant')
+      .map((entry) => entry.message.uuid)
+  );
+
+  return mergedAccumulators.map((entry) => rebuildMergedMessage(entry, keptAssistantUuids));
+}
+
+function buildSegmentId(participantKey: string, slices: StreamSlice[]): string {
+  const first = slices[0];
+  const last = slices[slices.length - 1];
+  return `${participantKey}:${first?.id ?? 'start'}:${last?.id ?? 'end'}`;
+}
+
+export class BoardTaskLogStreamService {
+  constructor(
+    private readonly recordSource: BoardTaskActivityRecordSource = new BoardTaskActivityRecordSource(),
+    private readonly summarySelector: BoardTaskExactLogSummarySelector = new BoardTaskExactLogSummarySelector(),
+    private readonly strictParser: BoardTaskExactLogStrictParser = new BoardTaskExactLogStrictParser(),
+    private readonly detailSelector: BoardTaskExactLogDetailSelector = new BoardTaskExactLogDetailSelector(),
+    private readonly chunkBuilder: BoardTaskExactLogChunkBuilder = new BoardTaskExactLogChunkBuilder()
+  ) {}
+
+  async getTaskLogStream(teamName: string, taskId: string): Promise<BoardTaskLogStreamResponse> {
+    if (!isBoardTaskExactLogsReadEnabled()) {
+      return emptyResponse();
+    }
+
+    const records = await this.recordSource.getTaskRecords(teamName, taskId);
+    if (records.length === 0) {
+      return emptyResponse();
+    }
+
+    const fileVersionsByPath = await getBoardTaskExactLogFileVersions(
+      records.map((record) => record.source.filePath)
+    );
+
+    const candidates = this.summarySelector
+      .selectSummaries({
+        records,
+        fileVersionsByPath,
+      })
+      .filter((candidate) => candidate.canLoadDetail)
+      .sort(compareCandidates);
+
+    if (candidates.length === 0) {
+      return emptyResponse();
+    }
+
+    const parsedMessagesByFile = await this.strictParser.parseFiles(
+      candidates.map((candidate) => candidate.source.filePath)
+    );
+
+    const slices: StreamSlice[] = [];
+    for (const candidate of candidates) {
+      const detail = this.detailSelector.selectDetail({
+        candidate,
+        records,
+        parsedMessagesByFile,
+      });
+      if (!detail || detail.filteredMessages.length === 0) {
+        continue;
+      }
+
+      const filteredMessages =
+        candidate.anchor.kind === 'tool'
+          ? pruneToolAnchoredAssistantOutputMessages(
+              detail.filteredMessages,
+              candidate.anchor.toolUseId
+            )
+          : detail.filteredMessages;
+      const sanitizedMessages = sanitizeJsonLikeToolResultPayloads(
+        filteredMessages,
+        candidate.canonicalToolName
+      );
+      const prunedMessages = pruneEmptyInternalToolResultMessages(sanitizedMessages);
+      if (prunedMessages.length === 0) {
+        continue;
+      }
+
+      const actor = toStreamActor(detail.actor);
+      slices.push({
+        id: detail.id,
+        timestamp: detail.timestamp,
+        filePath: detail.source.filePath,
+        participantKey: buildParticipantKey(actor),
+        actor,
+        actionCategory: candidate.actionCategory,
+        filteredMessages: prunedMessages,
+      });
+    }
+
+    if (slices.length === 0) {
+      return emptyResponse();
+    }
+
+    const deNoisedSlices = filterReadOnlySlices(slices);
+
+    const namedParticipantSlices = deNoisedSlices.filter((slice) =>
+      hasNamedParticipant(slice.actor)
+    );
+    const visibleSlices =
+      namedParticipantSlices.length > 0 ? namedParticipantSlices : deNoisedSlices;
+
+    const participantsByKey = new Map<string, BoardTaskLogParticipant>();
+    const participantOrder: string[] = [];
+    for (const slice of visibleSlices) {
+      if (participantsByKey.has(slice.participantKey)) {
+        continue;
+      }
+      participantsByKey.set(
+        slice.participantKey,
+        buildParticipant(slice.actor, slice.participantKey)
+      );
+      participantOrder.push(slice.participantKey);
+    }
+
+    const orderedParticipants = participantOrder
+      .map((key) => participantsByKey.get(key))
+      .filter((participant): participant is BoardTaskLogParticipant => Boolean(participant))
+      .sort((left, right) => {
+        if (left.isLead && !right.isLead) return 1;
+        if (!left.isLead && right.isLead) return -1;
+        return participantOrder.indexOf(left.key) - participantOrder.indexOf(right.key);
+      });
+
+    const segments: BoardTaskLogSegment[] = [];
+    let currentSegmentSlices: StreamSlice[] = [];
+
+    const flushSegment = (): void => {
+      if (currentSegmentSlices.length === 0) return;
+      const participantKey = currentSegmentSlices[0]!.participantKey;
+      const actor = currentSegmentSlices[0]!.actor;
+      const mergedMessages = mergeMessages(
+        currentSegmentSlices.map((slice) => ({
+          filePath: slice.filePath,
+          filteredMessages: slice.filteredMessages,
+        }))
+      );
+      const cleanedMessages = pruneEmptyInternalToolResultMessages(mergedMessages);
+      if (cleanedMessages.length === 0) {
+        currentSegmentSlices = [];
+        return;
+      }
+      const chunks = this.chunkBuilder.buildBundleChunks(cleanedMessages);
+      if (chunks.length > 0) {
+        segments.push({
+          id: buildSegmentId(participantKey, currentSegmentSlices),
+          participantKey,
+          actor,
+          startTimestamp: currentSegmentSlices[0]!.timestamp,
+          endTimestamp: currentSegmentSlices[currentSegmentSlices.length - 1]!.timestamp,
+          chunks,
+        });
+      }
+      currentSegmentSlices = [];
+    };
+
+    for (const slice of visibleSlices) {
+      if (
+        currentSegmentSlices.length > 0 &&
+        currentSegmentSlices[0]!.participantKey !== slice.participantKey
+      ) {
+        flushSegment();
+      }
+      currentSegmentSlices.push(slice);
+    }
+    flushSegment();
+
+    const namedParticipants = orderedParticipants.filter((participant) => !participant.isLead);
+    const defaultFilter = namedParticipants.length === 1 ? namedParticipants[0]!.key : 'all';
+
+    return {
+      participants: orderedParticipants,
+      defaultFilter,
+      segments,
+    };
+  }
+}

src/preload/constants/ipcChannels.ts

@@ -301,6 +301,18 @@ export const TEAM_GET_MEMBER_LOGS = 'team:getMemberLogs';
 /** Get session logs that reference a task */
 export const TEAM_GET_LOGS_FOR_TASK = 'team:getLogsForTask';
 
+/** Get explicit board-task activity derived from transcript metadata */
+export const TEAM_GET_TASK_ACTIVITY = 'team:getTaskActivity';
+
+/** Get one task-scoped log stream derived from explicit board-task activity */
+export const TEAM_GET_TASK_LOG_STREAM = 'team:getTaskLogStream';
+
+/** Get exact task-log summaries derived from explicit board-task activity records */
+export const TEAM_GET_TASK_EXACT_LOG_SUMMARIES = 'team:getTaskExactLogSummaries';
+
+/** Get one exact task-log detail bundle for renderer reuse */
+export const TEAM_GET_TASK_EXACT_LOG_DETAIL = 'team:getTaskExactLogDetail';
+
 /** Update team config (name, description) */
 export const TEAM_UPDATE_CONFIG = 'team:updateConfig';
 

src/preload/index.ts

@@ -8,12 +8,11 @@ import {
   API_KEYS_SAVE,
   API_KEYS_STORAGE_STATUS,
   APP_RELAUNCH,
-  CLI_INSTALLER_GET_STATUS,
   CLI_INSTALLER_GET_PROVIDER_STATUS,
+  CLI_INSTALLER_GET_STATUS,
   CLI_INSTALLER_INSTALL,
   CLI_INSTALLER_INVALIDATE_STATUS,
   CLI_INSTALLER_PROGRESS,
-  TMUX_GET_STATUS,
   CONTEXT_CHANGED,
   CONTEXT_GET_ACTIVE,
   CONTEXT_LIST,
@@ -125,8 +124,13 @@ import {
   TEAM_GET_DATA,
   TEAM_GET_DELETED_TASKS,
   TEAM_GET_LOGS_FOR_TASK,
+  TEAM_GET_TASK_ACTIVITY,
+  TEAM_GET_TASK_LOG_STREAM,
+  TEAM_GET_TASK_EXACT_LOG_DETAIL,
+  TEAM_GET_TASK_EXACT_LOG_SUMMARIES,
   TEAM_GET_MEMBER_LOGS,
   TEAM_GET_MEMBER_STATS,
+  TEAM_GET_MESSAGES_PAGE,
   TEAM_GET_PROJECT_BRANCH,
   TEAM_GET_SAVED_REQUEST,
   TEAM_GET_TASK_ATTACHMENT,
@@ -152,7 +156,6 @@ import {
   TEAM_RESTORE_TASK,
   TEAM_SAVE_TASK_ATTACHMENT,
   TEAM_SEND_MESSAGE,
-  TEAM_GET_MESSAGES_PAGE,
   TEAM_SET_CHANGE_PRESENCE_TRACKING,
   TEAM_SET_PROJECT_BRANCH_TRACKING,
   TEAM_SET_TASK_CLARIFICATION,
@@ -180,6 +183,7 @@ import {
   TERMINAL_RESIZE,
   TERMINAL_SPAWN,
   TERMINAL_WRITE,
+  TMUX_GET_STATUS,
   UPDATER_CHECK,
   UPDATER_DOWNLOAD,
   UPDATER_INSTALL,
@@ -228,6 +232,10 @@ import type {
   ApplyReviewRequest,
   ApplyReviewResult,
   AttachmentFileData,
+  BoardTaskActivityEntry,
+  BoardTaskLogStreamResponse,
+  BoardTaskExactLogDetailResult,
+  BoardTaskExactLogSummariesResponse,
   ChangeStats,
   ClaudeRootFolderSelection,
   ClaudeRootInfo,
@@ -252,6 +260,7 @@ import type {
   MemberFullStats,
   MemberLogSummary,
   MemberSpawnStatusesSnapshot,
+  MessagesPage,
   NotificationTrigger,
   ProjectBranchChangeEvent,
   RejectResult,
@@ -261,7 +270,6 @@ import type {
   ScheduleRun,
   SendMessageRequest,
   SendMessageResult,
-  MessagesPage,
   SessionsByIdsOptions,
   SessionsPaginationOptions,
   SnippetDiff,
@@ -290,10 +298,10 @@ import type {
   TeamTask,
   TeamTaskStatus,
   TeamUpdateConfigRequest,
+  TmuxStatus,
   ToolApprovalEvent,
   ToolApprovalFileContent,
   ToolApprovalSettings,
-  TmuxStatus,
   TriggerTestResult,
   UpdateKanbanPatch,
   UpdateSchedulePatch,
@@ -954,6 +962,41 @@ const electronAPI: ElectronAPI = {
         options
       );
     },
+    getTaskActivity: async (teamName: string, taskId: string) => {
+      return invokeIpcWithResult<BoardTaskActivityEntry[]>(
+        TEAM_GET_TASK_ACTIVITY,
+        teamName,
+        taskId
+      );
+    },
+    getTaskLogStream: async (teamName: string, taskId: string) => {
+      return invokeIpcWithResult<BoardTaskLogStreamResponse>(
+        TEAM_GET_TASK_LOG_STREAM,
+        teamName,
+        taskId
+      );
+    },
+    getTaskExactLogSummaries: async (teamName: string, taskId: string) => {
+      return invokeIpcWithResult<BoardTaskExactLogSummariesResponse>(
+        TEAM_GET_TASK_EXACT_LOG_SUMMARIES,
+        teamName,
+        taskId
+      );
+    },
+    getTaskExactLogDetail: async (
+      teamName: string,
+      taskId: string,
+      exactLogId: string,
+      expectedSourceGeneration: string
+    ) => {
+      return invokeIpcWithResult<BoardTaskExactLogDetailResult>(
+        TEAM_GET_TASK_EXACT_LOG_DETAIL,
+        teamName,
+        taskId,
+        exactLogId,
+        expectedSourceGeneration
+      );
+    },
     getMemberStats: async (teamName: string, memberName: string) => {
       return invokeIpcWithResult<MemberFullStats>(TEAM_GET_MEMBER_STATS, teamName, memberName);
     },

src/renderer/api/httpClient.ts

@@ -9,6 +9,9 @@
 import type {
   AppConfig,
   AttachmentFileData,
+  BoardTaskLogStreamResponse,
+  BoardTaskExactLogDetailResult,
+  BoardTaskExactLogSummariesResponse,
   ClaudeMdFileInfo,
   ClaudeRootFolderSelection,
   ClaudeRootInfo,
@@ -804,6 +807,26 @@ export class HttpAPIClient implements ElectronAPI {
     getLogsForTask: async () => {
       return [];
     },
+    getTaskActivity: async () => {
+      console.warn('[HttpAPIClient] getTaskActivity is not available in browser mode');
+      return [];
+    },
+    getTaskLogStream: async (): Promise<BoardTaskLogStreamResponse> => {
+      console.warn('[HttpAPIClient] getTaskLogStream is not available in browser mode');
+      return {
+        participants: [],
+        defaultFilter: 'all',
+        segments: [],
+      };
+    },
+    getTaskExactLogSummaries: async (): Promise<BoardTaskExactLogSummariesResponse> => {
+      console.warn('[HttpAPIClient] getTaskExactLogSummaries is not available in browser mode');
+      return { items: [] };
+    },
+    getTaskExactLogDetail: async (): Promise<BoardTaskExactLogDetailResult> => {
+      console.warn('[HttpAPIClient] getTaskExactLogDetail is not available in browser mode');
+      return { status: 'missing' };
+    },
     getMemberStats: async () => {
       console.warn('[HttpAPIClient] getMemberStats is not available in browser mode');
       return {

src/renderer/components/team/dialogs/TaskDetailDialog.tsx

@@ -9,7 +9,7 @@ import {
 import { CollapsibleTeamSection } from '@renderer/components/team/CollapsibleTeamSection';
 import { FileIcon } from '@renderer/components/team/editor/FileIcon';
 import { MemberBadge } from '@renderer/components/team/MemberBadge';
-import { MemberLogsTab } from '@renderer/components/team/members/MemberLogsTab';
+import { TaskLogsPanel } from '@renderer/components/team/taskLogs/TaskLogsPanel';
 import { Badge } from '@renderer/components/ui/badge';
 import { Button } from '@renderer/components/ui/button';
 import {
@@ -1256,29 +1256,8 @@ export const TaskDetailDialog = ({
             {variant === 'team' ? (
               <CollapsibleTeamSection
                 key={`task-logs:${currentTask.id}`}
-                title="Execution Logs"
+                title="Task Logs"
                 icon={<ScrollText size={14} />}
-                headerExtra={
-                  logsRefreshing || executionPreviewOnline ? (
-                    <span className="flex items-center gap-2 text-[10px] text-[var(--color-text-muted)]">
-                      {executionPreviewOnline ? (
-                        <span
-                          className="pointer-events-none relative inline-flex size-2 shrink-0"
-                          title="Online"
-                        >
-                          <span className="absolute inline-flex size-full animate-ping rounded-full bg-emerald-400 opacity-50" />
-                          <span className="relative inline-flex size-2 rounded-full bg-emerald-400" />
-                        </span>
-                      ) : null}
-                      {logsRefreshing ? (
-                        <span className="flex items-center gap-1">
-                          <Loader2 size={10} className="animate-spin" />
-                          Updating...
-                        </span>
-                      ) : null}
-                    </span>
-                  ) : null
-                }
                 contentClassName="pl-2.5 overflow-visible"
                 headerClassName="-mx-6 w-[calc(100%+3rem)]"
                 headerContentClassName="pl-6"
@@ -1286,19 +1265,14 @@ export const TaskDetailDialog = ({
                 keepMounted
               >
                 <div className="min-w-0">
-                  <MemberLogsTab
+                  <TaskLogsPanel
                     teamName={teamName}
-                    taskId={currentTask.id}
+                    task={currentTask}
-                    taskOwner={currentTask.owner}
-                    taskStatus={currentTask.status}
-                    taskWorkIntervals={currentTask.workIntervals}
                     taskSince={taskSince}
+                    isExecutionRefreshing={logsRefreshing}
+                    isExecutionPreviewOnline={executionPreviewOnline}
                     onRefreshingChange={setLogsRefreshing}
-                    // Only show a "latest messages" preview when this task is owned by a subagent.
-                    // For lead-owned tasks, the lead session is a mixed stream (lead + multiple agents),
-                    // so filtering to "just the member messages" is unreliable and easy to mislead.
                     showSubagentPreview={Boolean(currentTask.owner) && !isLeadOwnedTask}
-                    // Temporary debug option: for lead-owned tasks, show quick preview from lead session.
                     showLeadPreview={allowLeadExecutionPreview && isLeadOwnedTask}
                     onPreviewOnlineChange={setExecutionPreviewOnline}
                   />

src/renderer/components/team/taskLogs/ExactTaskLogCard.tsx

@@ -0,0 +1,132 @@
+import { MemberExecutionLog } from '@renderer/components/team/members/MemberExecutionLog';
+import { asEnhancedChunkArray } from '@renderer/types/data';
+import { ChevronDown, ChevronRight, Clock, FileText, Loader2 } from 'lucide-react';
+
+import type { BoardTaskExactLogSummary } from '@shared/types';
+
+export interface ExactTaskLogDetailState {
+  status: 'idle' | 'loading' | 'ok' | 'missing' | 'error';
+  generation?: string;
+  chunks?: ReturnType<typeof asEnhancedChunkArray>;
+  error?: string;
+}
+
+function formatRelativeTime(isoString: string): string {
+  const date = new Date(isoString);
+  const diffMs = Date.now() - date.getTime();
+  const diffMin = Math.floor(diffMs / 60_000);
+  const diffHours = Math.floor(diffMin / 60);
+  const diffDays = Math.floor(diffHours / 24);
+
+  if (!Number.isFinite(diffMs)) return '--';
+  if (diffMin < 1) return 'just now';
+  if (diffMin < 60) return `${diffMin}m ago`;
+  if (diffHours < 24) return `${diffHours}h ago`;
+  return `${diffDays}d ago`;
+}
+
+function actorLabel(summary: BoardTaskExactLogSummary): string {
+  if (summary.actor.memberName) {
+    return summary.actor.memberName;
+  }
+  if (summary.actor.role === 'lead' || summary.actor.isSidechain === false) {
+    return 'lead session';
+  }
+  return 'unknown actor';
+}
+
+function describeSummary(summary: BoardTaskExactLogSummary): string {
+  return summary.actionLabel;
+}
+
+function anchorKindLabel(summary: BoardTaskExactLogSummary): string {
+  return summary.anchorKind === 'tool' ? 'tool' : 'message';
+}
+
+function describeDetailState(state: ExactTaskLogDetailState | undefined): string | null {
+  if (!state) return null;
+  if (state.status === 'missing') {
+    return 'Exact detail is no longer available for this transcript slice.';
+  }
+  if (state.status === 'error') {
+    return state.error ?? 'Failed to load exact detail.';
+  }
+  return null;
+}
+
+interface ExactTaskLogCardProps {
+  summary: BoardTaskExactLogSummary;
+  expanded: boolean;
+  detailState?: ExactTaskLogDetailState;
+  onToggle: () => void;
+}
+
+export function ExactTaskLogCard({
+  summary,
+  expanded,
+  detailState,
+  onToggle,
+}: ExactTaskLogCardProps): React.JSX.Element {
+  const loadStateText = describeDetailState(detailState);
+
+  return (
+    <div className="min-w-0 rounded-md border border-[var(--color-border)] bg-[var(--color-surface)]">
+      <button
+        type="button"
+        className="sticky -top-6 z-10 flex w-full min-w-0 items-center gap-2 overflow-hidden rounded-t-md border-b border-transparent bg-[var(--color-surface)] px-3 py-2 text-left text-xs hover:bg-[var(--color-surface-raised)] disabled:cursor-not-allowed disabled:opacity-70"
+        disabled={!summary.canLoadDetail}
+        onClick={onToggle}
+        aria-expanded={summary.canLoadDetail ? expanded : undefined}
+      >
+        {summary.canLoadDetail ? (
+          expanded ? (
+            <ChevronDown size={12} className="shrink-0 text-[var(--color-text-muted)]" />
+          ) : (
+            <ChevronRight size={12} className="shrink-0 text-[var(--color-text-muted)]" />
+          )
+        ) : (
+          <FileText size={12} className="shrink-0 text-[var(--color-text-muted)]" />
+        )}
+        <div className="min-w-0 flex-1 overflow-hidden">
+          <div className="flex items-center gap-1.5">
+            <span className="truncate font-medium text-[var(--color-text)]">
+              {actorLabel(summary)}
+            </span>
+            <span className="text-[var(--color-text-muted)]">-</span>
+            <span className="truncate text-[var(--color-text)]">{describeSummary(summary)}</span>
+          </div>
+          <div className="mt-0.5 flex items-center gap-3 text-[10px] text-[var(--color-text-muted)]">
+            <span className="flex items-center gap-1">
+              <Clock size={10} />
+              {formatRelativeTime(summary.timestamp)}
+            </span>
+            <span>{anchorKindLabel(summary)}</span>
+            {!summary.canLoadDetail ? <span>summary only</span> : null}
+          </div>
+        </div>
+      </button>
+
+      {expanded ? (
+        <div className="border-t border-[var(--color-border)] px-3 py-2">
+          {detailState?.status === 'loading' ? (
+            <div className="flex items-center gap-2 py-4 text-xs text-[var(--color-text-muted)]">
+              <Loader2 size={12} className="animate-spin" />
+              Loading exact task logs...
+            </div>
+          ) : null}
+          {detailState?.status === 'ok' && detailState.chunks ? (
+            <div className="w-full min-w-0">
+              <MemberExecutionLog
+                chunks={detailState.chunks}
+                memberName={summary.actor.isSidechain ? summary.actor.memberName : undefined}
+              />
+            </div>
+          ) : null}
+          {detailState?.status !== 'loading' && loadStateText ? (
+            <div className="py-4 text-xs text-[var(--color-text-muted)]">{loadStateText}</div>
+          ) : null}
+        </div>
+      ) : null}
+    </div>
+  );
+}

src/renderer/components/team/taskLogs/ExactTaskLogsSection.tsx

@@ -0,0 +1,262 @@
+import { useCallback, useEffect, useMemo, useRef, useState } from 'react';
+
+import { api } from '@renderer/api';
+import { asEnhancedChunkArray } from '@renderer/types/data';
+import { AlertCircle, FileText, Loader2 } from 'lucide-react';
+
+import { ExactTaskLogCard, type ExactTaskLogDetailState } from './ExactTaskLogCard';
+
+import type { BoardTaskExactLogSummary } from '@shared/types';
+
+interface ExactTaskLogsSectionProps {
+  teamName: string;
+  taskId: string;
+}
+
+export function ExactTaskLogsSection({
+  teamName,
+  taskId,
+}: ExactTaskLogsSectionProps): React.JSX.Element {
+  const [summaries, setSummaries] = useState<BoardTaskExactLogSummary[]>([]);
+  const [loading, setLoading] = useState(true);
+  const [error, setError] = useState<string | null>(null);
+  const [expandedId, setExpandedId] = useState<string | null>(null);
+  const [detailStates, setDetailStates] = useState<Record<string, ExactTaskLogDetailState>>({});
+  const latestRequestSeqById = useRef<Record<string, number>>({});
+
+  const loadSummaries = useCallback(async (): Promise<BoardTaskExactLogSummary[]> => {
+    const result = await api.teams.getTaskExactLogSummaries(teamName, taskId);
+    const nextItems = [...result.items].sort((left, right) => {
+      const leftTs = Date.parse(left.timestamp);
+      const rightTs = Date.parse(right.timestamp);
+      if (Number.isFinite(leftTs) && Number.isFinite(rightTs) && leftTs !== rightTs) {
+        return rightTs - leftTs;
+      }
+      if (left.source.filePath !== right.source.filePath) {
+        return left.source.filePath.localeCompare(right.source.filePath);
+      }
+      if (left.source.sourceOrder !== right.source.sourceOrder) {
+        return left.source.sourceOrder - right.source.sourceOrder;
+      }
+      return left.id.localeCompare(right.id);
+    });
+    setSummaries(nextItems);
+    return nextItems;
+  }, [taskId, teamName]);
+
+  useEffect(() => {
+    let cancelled = false;
+
+    const run = async (): Promise<void> => {
+      try {
+        setLoading(true);
+        setError(null);
+        setExpandedId(null);
+        setDetailStates({});
+        latestRequestSeqById.current = {};
+        const nextItems = await api.teams.getTaskExactLogSummaries(teamName, taskId);
+        if (cancelled) return;
+        setSummaries(
+          [...nextItems.items].sort((left, right) => {
+            const leftTs = Date.parse(left.timestamp);
+            const rightTs = Date.parse(right.timestamp);
+            if (Number.isFinite(leftTs) && Number.isFinite(rightTs) && leftTs !== rightTs) {
+              return rightTs - leftTs;
+            }
+            if (left.source.filePath !== right.source.filePath) {
+              return left.source.filePath.localeCompare(right.source.filePath);
+            }
+            if (left.source.sourceOrder !== right.source.sourceOrder) {
+              return left.source.sourceOrder - right.source.sourceOrder;
+            }
+            return left.id.localeCompare(right.id);
+          })
+        );
+      } catch (loadError) {
+        if (!cancelled) {
+          setError(
+            loadError instanceof Error ? loadError.message : 'Failed to load exact task logs'
+          );
+          setSummaries([]);
+        }
+      } finally {
+        if (!cancelled) {
+          setLoading(false);
+        }
+      }
+    };
+
+    void run();
+    return () => {
+      cancelled = true;
+    };
+  }, [taskId, teamName]);
+
+  const fetchDetail = useCallback(
+    async (
+      summary: Extract<BoardTaskExactLogSummary, { canLoadDetail: true }>,
+      retryOnStale: boolean
+    ): Promise<void> => {
+      const nextSeq = (latestRequestSeqById.current[summary.id] ?? 0) + 1;
+      latestRequestSeqById.current[summary.id] = nextSeq;
+      setDetailStates((prev) => ({
+        ...prev,
+        [summary.id]: {
+          status: 'loading',
+          generation: summary.sourceGeneration,
+        },
+      }));
+
+      try {
+        const result = await api.teams.getTaskExactLogDetail(
+          teamName,
+          taskId,
+          summary.id,
+          summary.sourceGeneration
+        );
+        if (latestRequestSeqById.current[summary.id] !== nextSeq) {
+          return;
+        }
+
+        if (result.status === 'stale' && retryOnStale) {
+          const refreshed = await loadSummaries();
+          const refreshedSummary = refreshed.find(
+            (item): item is Extract<BoardTaskExactLogSummary, { canLoadDetail: true }> =>
+              item.id === summary.id && item.canLoadDetail
+          );
+          if (!refreshedSummary) {
+            setDetailStates((prev) => ({
+              ...prev,
+              [summary.id]: { status: 'missing' },
+            }));
+            return;
+          }
+          await fetchDetail(refreshedSummary, false);
+          return;
+        }
+
+        if (result.status === 'ok') {
+          setDetailStates((prev) => ({
+            ...prev,
+            [summary.id]: {
+              status: 'ok',
+              generation: summary.sourceGeneration,
+              chunks: asEnhancedChunkArray(result.detail.chunks),
+            },
+          }));
+          return;
+        }
+
+        setDetailStates((prev) => ({
+          ...prev,
+          [summary.id]: { status: 'missing', generation: summary.sourceGeneration },
+        }));
+      } catch (detailError) {
+        if (latestRequestSeqById.current[summary.id] !== nextSeq) {
+          return;
+        }
+        setDetailStates((prev) => ({
+          ...prev,
+          [summary.id]: {
+            status: 'error',
+            generation: summary.sourceGeneration,
+            error:
+              detailError instanceof Error ? detailError.message : 'Failed to load exact task logs',
+          },
+        }));
+      }
+    },
+    [loadSummaries, taskId, teamName]
+  );
+
+  const handleToggle = useCallback(
+    async (summary: BoardTaskExactLogSummary): Promise<void> => {
+      if (!summary.canLoadDetail) {
+        return;
+      }
+      if (expandedId === summary.id) {
+        setExpandedId(null);
+        return;
+      }
+      setExpandedId(summary.id);
+
+      const existing = detailStates[summary.id];
+      if (existing?.generation === summary.sourceGeneration && existing.status !== 'error') {
+        return;
+      }
+
+      await fetchDetail(summary, true);
+    },
+    [detailStates, expandedId, fetchDetail]
+  );
+
+  const visibleSummaries = useMemo(() => summaries, [summaries]);
+
+  if (loading && visibleSummaries.length === 0) {
+    return (
+      <div className="space-y-2">
+        <div className="flex items-center gap-2">
+          <h4 className="text-xs font-semibold uppercase tracking-[0.2em] text-[var(--color-text-muted)]">
+            Exact Task Logs
+          </h4>
+        </div>
+        <div className="flex items-center gap-2 py-4 text-xs text-[var(--color-text-muted)]">
+          <Loader2 size={12} className="animate-spin" />
+          Loading exact task logs...
+        </div>
+      </div>
+    );
+  }
+
+  if (error) {
+    return (
+      <div className="space-y-2">
+        <div className="flex items-center gap-2">
+          <h4 className="text-xs font-semibold uppercase tracking-[0.2em] text-[var(--color-text-muted)]">
+            Exact Task Logs
+          </h4>
+        </div>
+        <div className="flex items-center gap-2 py-4 text-xs text-red-400">
+          <AlertCircle size={14} />
+          {error}
+        </div>
+      </div>
+    );
+  }
+
+  return (
+    <div className="space-y-2">
+      <div className="flex items-center gap-2">
+        <h4 className="text-xs font-semibold uppercase tracking-[0.2em] text-[var(--color-text-muted)]">
+          Exact Task Logs
+        </h4>
+      </div>
+      <p className="text-xs text-[var(--color-text-muted)]">
+        Exact transcript slices rendered with the same execution-log components used in Logs.
+      </p>
+
+      {visibleSummaries.length === 0 ? (
+        <div className="py-8 text-center text-xs text-[var(--color-text-muted)]">
+          <FileText size={20} className="mx-auto mb-2 opacity-40" />
+          No exact task logs yet
+          <p className="mt-1 text-[10px] opacity-60">
+            Exact transcript bundles will appear here when explicit task-linked transcript metadata
+            is available.
+          </p>
+        </div>
+      ) : (
+        <div className="w-full min-w-0 space-y-1.5">
+          {visibleSummaries.map((summary) => (
+            <ExactTaskLogCard
+              key={summary.id}
+              summary={summary}
+              expanded={expandedId === summary.id}
+              detailState={detailStates[summary.id]}
+              onToggle={() => void handleToggle(summary)}
+            />
+          ))}
+        </div>
+      )}
+    </div>
+  );
+}

src/renderer/components/team/taskLogs/ExecutionSessionsSection.tsx

@@ -0,0 +1,48 @@
+import type { ComponentProps } from 'react';
+
+import { MemberLogsTab } from '@renderer/components/team/members/MemberLogsTab';
+import { Loader2 } from 'lucide-react';
+
+interface ExecutionSessionsSectionProps extends ComponentProps<typeof MemberLogsTab> {
+  isRefreshing?: boolean;
+  isPreviewOnline?: boolean;
+}
+
+export function ExecutionSessionsSection({
+  isRefreshing = false,
+  isPreviewOnline = false,
+  ...props
+}: ExecutionSessionsSectionProps): React.JSX.Element {
+  return (
+    <div className="space-y-2">
+      <div className="flex items-center gap-2">
+        <h4 className="text-xs font-semibold uppercase tracking-[0.2em] text-[var(--color-text-muted)]">
+          Execution Sessions
+        </h4>
+        {isRefreshing || isPreviewOnline ? (
+          <span className="flex items-center gap-2 text-[10px] text-[var(--color-text-muted)]">
+            {isPreviewOnline ? (
+              <span
+                className="pointer-events-none relative inline-flex size-2 shrink-0"
+                title="Online"
+              >
+                <span className="absolute inline-flex size-full animate-ping rounded-full bg-emerald-400 opacity-50" />
+                <span className="relative inline-flex size-2 rounded-full bg-emerald-400" />
+              </span>
+            ) : null}
+            {isRefreshing ? (
+              <span className="flex items-center gap-1">
+                <Loader2 size={10} className="animate-spin" />
+                Updating...
+              </span>
+            ) : null}
+          </span>
+        ) : null}
+      </div>
+      <p className="text-xs text-[var(--color-text-muted)]">
+        Legacy session-centric transcript browsing and previews.
+      </p>
+      <MemberLogsTab {...props} />
+    </div>
+  );
+}

src/renderer/components/team/taskLogs/TaskActivitySection.tsx

@@ -0,0 +1,211 @@
+import { api } from '@renderer/api';
+import { AlertCircle, Loader2 } from 'lucide-react';
+import { useEffect, useMemo, useState } from 'react';
+import {
+  describeBoardTaskActivityLabel,
+  formatBoardTaskActivityTaskLabel,
+} from '@shared/utils/boardTaskActivityLabels';
+
+import type { BoardTaskActivityEntry, BoardTaskActivityTaskRef } from '@shared/types';
+
+interface TaskActivitySectionProps {
+  teamName: string;
+  taskId: string;
+}
+
+function formatEntryTime(timestamp: string): string {
+  const date = new Date(timestamp);
+  if (Number.isNaN(date.getTime())) {
+    return '--:--';
+  }
+  return date.toLocaleTimeString([], {
+    hour: '2-digit',
+    minute: '2-digit',
+  });
+}
+
+function formatTaskLabel(task: BoardTaskActivityTaskRef | undefined): string | null {
+  return formatBoardTaskActivityTaskLabel(task);
+}
+
+function relationshipContextLabel(entry: BoardTaskActivityEntry): string | null {
+  const peerTaskLabel = formatTaskLabel(entry.action?.peerTask);
+  if (!peerTaskLabel) return null;
+
+  switch (entry.action?.relationshipPerspective) {
+    case 'incoming':
+      return `from ${peerTaskLabel}`;
+    case 'outgoing':
+      return `to ${peerTaskLabel}`;
+    default:
+      return `with ${peerTaskLabel}`;
+  }
+}
+
+function describeContext(entry: BoardTaskActivityEntry): string | null {
+  const parts: string[] = [];
+
+  const relationshipContext = relationshipContextLabel(entry);
+  if (relationshipContext) {
+    parts.push(relationshipContext);
+  }
+
+  if (entry.actorContext.relation === 'other_active_task') {
+    const activeTaskLabel = formatTaskLabel(entry.actorContext.activeTask);
+    if (activeTaskLabel) {
+      parts.push(`while working on ${activeTaskLabel}`);
+    } else {
+      parts.push('while another task was active');
+    }
+  } else if (entry.actorContext.relation === 'ambiguous') {
+    parts.push('while multiple task scopes were active');
+  } else if (entry.actorContext.relation === 'idle' && entry.linkKind !== 'execution') {
+    parts.push('without an active task scope');
+  }
+
+  if (entry.task.resolution === 'deleted') {
+    parts.push('task is deleted');
+  } else if (entry.task.resolution === 'ambiguous') {
+    parts.push('task resolution is ambiguous');
+  } else if (entry.task.resolution === 'unresolved') {
+    parts.push('task could not be resolved');
+  }
+
+  return parts.length > 0 ? parts.join(' - ') : null;
+}
+
+function actorLabel(entry: BoardTaskActivityEntry): string {
+  if (entry.actor.memberName) {
+    return entry.actor.memberName;
+  }
+  if (entry.actor.role === 'lead' || entry.actor.isSidechain === false) {
+    return 'lead session';
+  }
+  return 'unknown actor';
+}
+
+function Row({ entry }: { entry: BoardTaskActivityEntry }): React.JSX.Element {
+  const context = describeContext(entry);
+  const tone =
+    entry.task.resolution === 'resolved'
+      ? 'text-[var(--color-text)]'
+      : 'text-[var(--color-text-muted)]';
+
+  return (
+    <div className="border-[var(--color-border-muted)]/60 bg-[var(--color-bg-elevated)]/40 rounded-md border px-3 py-2">
+      <div className="flex items-start gap-3">
+        <div className="min-w-12 pt-0.5 text-[10px] font-medium uppercase tracking-[0.16em] text-[var(--color-text-muted)]">
+          {formatEntryTime(entry.timestamp)}
+        </div>
+        <div className="min-w-0 flex-1">
+          <div className={`text-sm ${tone}`}>
+            <span className="font-medium">{actorLabel(entry)}</span>
+            <span className="text-[var(--color-text-muted)]"> - </span>
+            <span>{describeBoardTaskActivityLabel(entry)}</span>
+          </div>
+          {context ? (
+            <p className="mt-1 text-xs text-[var(--color-text-muted)]">{context}</p>
+          ) : null}
+        </div>
+      </div>
+    </div>
+  );
+}
+
+export function TaskActivitySection({
+  teamName,
+  taskId,
+}: TaskActivitySectionProps): React.JSX.Element {
+  const [entries, setEntries] = useState<BoardTaskActivityEntry[]>([]);
+  const [loading, setLoading] = useState(true);
+  const [error, setError] = useState<string | null>(null);
+
+  useEffect(() => {
+    let cancelled = false;
+
+    const load = async (): Promise<void> => {
+      try {
+        if (!cancelled && entries.length === 0) {
+          setLoading(true);
+        }
+        if (!cancelled) {
+          setError(null);
+        }
+        const result = await api.teams.getTaskActivity(teamName, taskId);
+        if (!cancelled) {
+          setEntries(result);
+        }
+      } catch (loadError) {
+        if (!cancelled) {
+          setError(loadError instanceof Error ? loadError.message : 'Failed to load task activity');
+          setEntries([]);
+        }
+      } finally {
+        if (!cancelled) {
+          setLoading(false);
+        }
+      }
+    };
+
+    void load();
+    const intervalId = window.setInterval(() => {
+      void load();
+    }, 8000);
+
+    return () => {
+      cancelled = true;
+      window.clearInterval(intervalId);
+    };
+  }, [entries.length, teamName, taskId]);
+
+  const content = useMemo(() => {
+    if (loading) {
+      return (
+        <div className="flex items-center gap-2 text-xs text-[var(--color-text-muted)]">
+          <Loader2 size={12} className="animate-spin" />
+          Loading task activity...
+        </div>
+      );
+    }
+
+    if (error) {
+      return (
+        <div className="flex items-center gap-2 rounded-md border border-red-500/30 bg-red-500/5 px-3 py-2 text-xs text-red-300">
+          <AlertCircle size={12} />
+          {error}
+        </div>
+      );
+    }
+
+    if (entries.length === 0) {
+      return (
+        <p className="text-xs text-[var(--color-text-muted)]">
+          No explicit task activity was found in the available transcripts yet. Older or heuristic
+          session logs may still be available below in Execution Sessions.
+        </p>
+      );
+    }
+
+    return (
+      <div className="space-y-2">
+        {entries.map((entry) => (
+          <Row key={entry.id} entry={entry} />
+        ))}
+      </div>
+    );
+  }, [entries, error, loading]);
+
+  return (
+    <div className="space-y-2">
+      <div className="flex items-center gap-2">
+        <h4 className="text-xs font-semibold uppercase tracking-[0.2em] text-[var(--color-text-muted)]">
+          Task Activity
+        </h4>
+      </div>
+      <p className="text-xs text-[var(--color-text-muted)]">
+        Explicit runtime activity linked to this task from transcript metadata.
+      </p>
+      {content}
+    </div>
+  );
+}

src/renderer/components/team/taskLogs/TaskLogStreamSection.tsx

@@ -0,0 +1,222 @@
+import { useEffect, useMemo, useState } from 'react';
+
+import { api } from '@renderer/api';
+import { MemberExecutionLog } from '@renderer/components/team/members/MemberExecutionLog';
+import { asEnhancedChunkArray } from '@renderer/types/data';
+import { AlertCircle, Clock, FileText, Loader2 } from 'lucide-react';
+
+import type {
+  BoardTaskLogActor,
+  BoardTaskLogSegment,
+  BoardTaskLogStreamResponse,
+} from '@shared/types';
+
+interface TaskLogStreamSectionProps {
+  teamName: string;
+  taskId: string;
+}
+
+function formatRelativeTime(isoString: string): string {
+  const date = new Date(isoString);
+  const diffMs = Date.now() - date.getTime();
+  const diffMin = Math.floor(diffMs / 60_000);
+  const diffHours = Math.floor(diffMin / 60);
+  const diffDays = Math.floor(diffHours / 24);
+
+  if (!Number.isFinite(diffMs)) return '--';
+  if (diffMin < 1) return 'just now';
+  if (diffMin < 60) return `${diffMin}m ago`;
+  if (diffHours < 24) return `${diffHours}h ago`;
+  return `${diffDays}d ago`;
+}
+
+function actorLabel(actor: BoardTaskLogActor): string {
+  if (actor.memberName) {
+    return actor.memberName;
+  }
+  if (actor.role === 'lead' || actor.isSidechain === false) {
+    return 'lead session';
+  }
+  if (actor.agentId) {
+    return `member ${actor.agentId.slice(0, 8)}`;
+  }
+  return `member session ${actor.sessionId.slice(0, 8)}`;
+}
+
+function normalizeResponse(response: BoardTaskLogStreamResponse): BoardTaskLogStreamResponse {
+  return {
+    participants: response.participants,
+    defaultFilter: response.defaultFilter,
+    segments: response.segments.map((segment) => ({
+      ...segment,
+      chunks: asEnhancedChunkArray(segment.chunks) ?? [],
+    })),
+  };
+}
+
+function SegmentMarker({ segment }: { segment: BoardTaskLogSegment }): React.JSX.Element {
+  return (
+    <div className="mb-2 flex items-center gap-2 text-[10px] text-[var(--color-text-muted)]">
+      <span className="rounded-full border border-[var(--color-border)] px-2 py-0.5 font-medium text-[var(--color-text-secondary)]">
+        {actorLabel(segment.actor)}
+      </span>
+      <span className="flex items-center gap-1">
+        <Clock size={10} />
+        {formatRelativeTime(segment.endTimestamp)}
+      </span>
+    </div>
+  );
+}
+
+function SegmentBlock({
+  segment,
+  showHeader,
+}: {
+  segment: BoardTaskLogSegment;
+  showHeader: boolean;
+}): React.JSX.Element {
+  return (
+    <div className="min-w-0 overflow-hidden">
+      {showHeader ? <SegmentMarker segment={segment} /> : null}
+      <MemberExecutionLog chunks={segment.chunks} memberName={segment.actor.memberName} />
+    </div>
+  );
+}
+
+export function TaskLogStreamSection({
+  teamName,
+  taskId,
+}: TaskLogStreamSectionProps): React.JSX.Element {
+  const [stream, setStream] = useState<BoardTaskLogStreamResponse | null>(null);
+  const [loading, setLoading] = useState(true);
+  const [error, setError] = useState<string | null>(null);
+  const [selectedParticipantKey, setSelectedParticipantKey] = useState<'all' | string>('all');
+
+  useEffect(() => {
+    let cancelled = false;
+
+    const run = async (): Promise<void> => {
+      try {
+        setLoading(true);
+        setError(null);
+        const response = normalizeResponse(await api.teams.getTaskLogStream(teamName, taskId));
+        if (cancelled) return;
+        setStream(response);
+        setSelectedParticipantKey(response.defaultFilter);
+      } catch (loadError) {
+        if (cancelled) return;
+        setError(loadError instanceof Error ? loadError.message : 'Failed to load task log stream');
+        setStream(null);
+      } finally {
+        if (!cancelled) {
+          setLoading(false);
+        }
+      }
+    };
+
+    void run();
+    return () => {
+      cancelled = true;
+    };
+  }, [taskId, teamName]);
+
+  const participants = stream?.participants ?? [];
+  const showChips = participants.length > 1;
+  const visibleSegments = useMemo(() => {
+    const source = stream?.segments ?? [];
+    const filtered =
+      selectedParticipantKey === 'all'
+        ? source
+        : source.filter((segment) => segment.participantKey === selectedParticipantKey);
+    return [...filtered].reverse();
+  }, [selectedParticipantKey, stream?.segments]);
+
+  const showSegmentHeaders =
+    participants.length > 1 || (selectedParticipantKey !== 'all' && visibleSegments.length > 1);
+
+  if (loading) {
+    return (
+      <div className="space-y-2">
+        <h4 className="text-xs font-semibold uppercase tracking-[0.2em] text-[var(--color-text-muted)]">
+          Task Log Stream
+        </h4>
+        <div className="flex items-center gap-2 py-4 text-xs text-[var(--color-text-muted)]">
+          <Loader2 size={12} className="animate-spin" />
+          Loading task log stream...
+        </div>
+      </div>
+    );
+  }
+
+  if (error) {
+    return (
+      <div className="space-y-2">
+        <h4 className="text-xs font-semibold uppercase tracking-[0.2em] text-[var(--color-text-muted)]">
+          Task Log Stream
+        </h4>
+        <div className="flex items-center gap-2 py-4 text-xs text-red-400">
+          <AlertCircle size={14} />
+          {error}
+        </div>
+      </div>
+    );
+  }
+
+  return (
+    <div className="space-y-3">
+      <h4 className="text-xs font-semibold uppercase tracking-[0.2em] text-[var(--color-text-muted)]">
+        Task Log Stream
+      </h4>
+      <p className="text-xs text-[var(--color-text-muted)]">
+        Task-scoped transcript logs rendered with the same execution-log components used in Logs.
+      </p>
+
+      {showChips ? (
+        <div className="flex flex-wrap items-center gap-1.5">
+          <button
+            type="button"
+            className={`rounded-full border px-2.5 py-1 text-[11px] transition-colors ${
+              selectedParticipantKey === 'all'
+                ? 'bg-[var(--color-accent)]/10 border-[var(--color-accent)] text-[var(--color-text)]'
+                : 'border-[var(--color-border)] text-[var(--color-text-muted)] hover:text-[var(--color-text)]'
+            }`}
+            onClick={() => setSelectedParticipantKey('all')}
+          >
+            All
+          </button>
+          {participants.map((participant) => (
+            <button
+              key={participant.key}
+              type="button"
+              className={`rounded-full border px-2.5 py-1 text-[11px] transition-colors ${
+                selectedParticipantKey === participant.key
+                  ? 'bg-[var(--color-accent)]/10 border-[var(--color-accent)] text-[var(--color-text)]'
+                  : 'border-[var(--color-border)] text-[var(--color-text-muted)] hover:text-[var(--color-text)]'
+              }`}
+              onClick={() => setSelectedParticipantKey(participant.key)}
+            >
+              {participant.label}
+            </button>
+          ))}
+        </div>
+      ) : null}
+
+      {visibleSegments.length === 0 ? (
+        <div className="py-8 text-center text-xs text-[var(--color-text-muted)]">
+          <FileText size={20} className="mx-auto mb-2 opacity-40" />
+          No task log stream yet
+          <p className="mt-1 text-[10px] opacity-60">
+            Task-linked transcript logs will appear here when explicit task-linked transcript
+            metadata is available.
+          </p>
+        </div>
+      ) : (
+        <div className="space-y-6">
+          {visibleSegments.map((segment) => (
+            <SegmentBlock key={segment.id} segment={segment} showHeader={showSegmentHeaders} />
+          ))}
+        </div>
+      )}
+    </div>
+  );
+}

src/renderer/components/team/taskLogs/TaskLogsPanel.tsx

@@ -0,0 +1,55 @@
+import { ExecutionSessionsSection } from './ExecutionSessionsSection';
+import { TaskActivitySection } from './TaskActivitySection';
+import { TaskLogStreamSection } from './TaskLogStreamSection';
+import { isBoardTaskActivityUiEnabled, isBoardTaskExactLogsUiEnabled } from './featureGates';
+
+import type { TeamTaskWithKanban } from '@shared/types';
+
+interface TaskLogsPanelProps {
+  teamName: string;
+  task: TeamTaskWithKanban;
+  taskSince?: string;
+  isExecutionRefreshing?: boolean;
+  isExecutionPreviewOnline?: boolean;
+  onRefreshingChange?: (isRefreshing: boolean) => void;
+  showSubagentPreview?: boolean;
+  showLeadPreview?: boolean;
+  onPreviewOnlineChange?: (isOnline: boolean) => void;
+}
+
+export function TaskLogsPanel({
+  teamName,
+  task,
+  taskSince,
+  isExecutionRefreshing = false,
+  isExecutionPreviewOnline = false,
+  onRefreshingChange,
+  showSubagentPreview = false,
+  showLeadPreview = false,
+  onPreviewOnlineChange,
+}: TaskLogsPanelProps): React.JSX.Element {
+  return (
+    <div className="space-y-4">
+      {isBoardTaskActivityUiEnabled() ? (
+        <TaskActivitySection teamName={teamName} taskId={task.id} />
+      ) : null}
+      {isBoardTaskExactLogsUiEnabled() ? (
+        <TaskLogStreamSection teamName={teamName} taskId={task.id} />
+      ) : null}
+      <ExecutionSessionsSection
+        teamName={teamName}
+        taskId={task.id}
+        taskOwner={task.owner}
+        taskStatus={task.status}
+        taskWorkIntervals={task.workIntervals}
+        taskSince={taskSince}
+        isRefreshing={isExecutionRefreshing}
+        isPreviewOnline={isExecutionPreviewOnline}
+        onRefreshingChange={onRefreshingChange}
+        showSubagentPreview={showSubagentPreview}
+        showLeadPreview={showLeadPreview}
+        onPreviewOnlineChange={onPreviewOnlineChange}
+      />
+    </div>
+  );
+}

src/renderer/components/team/taskLogs/featureGates.ts

@@ -0,0 +1,22 @@
+function readEnabledFlag(value: unknown, defaultValue: boolean): boolean {
+  if (typeof value !== 'string') {
+    return defaultValue;
+  }
+
+  const normalized = value.trim().toLowerCase();
+  if (normalized === '0' || normalized === 'false' || normalized === 'off' || normalized === 'no') {
+    return false;
+  }
+  if (normalized === '1' || normalized === 'true' || normalized === 'on' || normalized === 'yes') {
+    return true;
+  }
+  return defaultValue;
+}
+
+export function isBoardTaskActivityUiEnabled(): boolean {
+  return readEnabledFlag(import.meta.env.VITE_BOARD_TASK_ACTIVITY_UI_ENABLED, true);
+}
+
+export function isBoardTaskExactLogsUiEnabled(): boolean {
+  return readEnabledFlag(import.meta.env.VITE_BOARD_TASK_EXACT_LOGS_UI_ENABLED, true);
+}

src/shared/types/api.ts

@@ -38,6 +38,10 @@ import type {
 } from './schedule';
 import type {
   AddMemberRequest,
+  BoardTaskActivityEntry,
+  BoardTaskLogStreamResponse,
+  BoardTaskExactLogDetailResult,
+  BoardTaskExactLogSummariesResponse,
   AddTaskCommentRequest,
   AttachmentFileData,
   CreateTaskRequest,
@@ -51,11 +55,11 @@ import type {
   MemberFullStats,
   MemberLogSummary,
   MemberSpawnStatusesSnapshot,
+  MessagesPage,
   ProjectBranchChangeEvent,
   ReplaceMembersRequest,
   SendMessageRequest,
   SendMessageResult,
-  MessagesPage,
   TaskAttachmentMeta,
   TaskChangePresenceState,
   TaskComment,
@@ -477,6 +481,18 @@ export interface TeamsAPI {
       since?: string;
     }
   ) => Promise<MemberLogSummary[]>;
+  getTaskActivity: (teamName: string, taskId: string) => Promise<BoardTaskActivityEntry[]>;
+  getTaskLogStream: (teamName: string, taskId: string) => Promise<BoardTaskLogStreamResponse>;
+  getTaskExactLogSummaries: (
+    teamName: string,
+    taskId: string
+  ) => Promise<BoardTaskExactLogSummariesResponse>;
+  getTaskExactLogDetail: (
+    teamName: string,
+    taskId: string,
+    exactLogId: string,
+    expectedSourceGeneration: string
+  ) => Promise<BoardTaskExactLogDetailResult>;
   getMemberStats: (teamName: string, memberName: string) => Promise<MemberFullStats>;
   launchTeam: (request: TeamLaunchRequest) => Promise<TeamLaunchResponse>;
   getAllTasks: () => Promise<GlobalTask[]>;

src/shared/utils/boardTaskActivityLabels.ts

@@ -0,0 +1,128 @@
+import type {
+  BoardTaskActivityAction,
+  BoardTaskActivityLinkKind,
+  BoardTaskActivityTaskRef,
+} from '../types/team';
+
+interface BoardTaskActivityLabelInput {
+  action?: BoardTaskActivityAction;
+  linkKind: BoardTaskActivityLinkKind;
+}
+
+export function formatBoardTaskActivityTaskLabel(
+  task: BoardTaskActivityTaskRef | undefined
+): string | null {
+  if (!task) return null;
+  if (task.taskRef) {
+    return `#${task.taskRef.displayId}`;
+  }
+  if (task.locator.ref) {
+    return `#${task.locator.ref}`;
+  }
+  return null;
+}
+
+function describeRelationshipAction(
+  action: BoardTaskActivityAction | undefined,
+  verb: 'link' | 'unlink'
+): string {
+  const peerTaskLabel = formatBoardTaskActivityTaskLabel(action?.peerTask);
+  const relationship = action?.details?.relationship;
+
+  if (relationship === 'related' && peerTaskLabel) {
+    return verb === 'link'
+      ? `Linked related task ${peerTaskLabel}`
+      : `Removed related link with ${peerTaskLabel}`;
+  }
+
+  if (action?.relationshipPerspective === 'incoming' && peerTaskLabel) {
+    return verb === 'link'
+      ? `Linked blocked by ${peerTaskLabel}`
+      : `Removed blocked-by link from ${peerTaskLabel}`;
+  }
+
+  if (action?.relationshipPerspective === 'outgoing' && peerTaskLabel) {
+    return verb === 'link'
+      ? `Linked blocks ${peerTaskLabel}`
+      : `Removed blocks link to ${peerTaskLabel}`;
+  }
+
+  if (relationship) {
+    return verb === 'link' ? `Linked task as ${relationship}` : `Removed ${relationship} link`;
+  }
+
+  return verb === 'link' ? 'Linked task' : 'Removed task link';
+}
+
+export function describeBoardTaskActivityLabel(input: BoardTaskActivityLabelInput): string {
+  const toolName = input.action?.canonicalToolName;
+  switch (toolName) {
+    case 'task_start':
+      return 'Started work';
+    case 'task_complete':
+      return 'Completed task';
+    case 'task_set_status':
+      return input.action?.details?.status
+        ? `Set status to ${input.action.details.status}`
+        : 'Updated task status';
+    case 'review_start':
+      return 'Started review';
+    case 'review_approve':
+      return 'Approved review';
+    case 'review_request_changes':
+      return 'Requested changes';
+    case 'review_request':
+      return input.action?.details?.reviewer
+        ? `Requested review from ${input.action.details.reviewer}`
+        : 'Requested review';
+    case 'task_add_comment':
+      return 'Added a comment';
+    case 'task_attach_file':
+      return input.action?.details?.filename
+        ? `Attached ${input.action.details.filename}`
+        : 'Attached a file';
+    case 'task_attach_comment_file':
+      return input.action?.details?.filename
+        ? `Attached ${input.action.details.filename} to a comment`
+        : 'Attached a file to a comment';
+    case 'task_get':
+      return 'Viewed task';
+    case 'task_get_comment':
+      return input.action?.details?.commentId
+        ? `Viewed comment ${input.action.details.commentId}`
+        : 'Viewed comment';
+    case 'task_link':
+      return describeRelationshipAction(input.action, 'link');
+    case 'task_unlink':
+      return describeRelationshipAction(input.action, 'unlink');
+    case 'task_set_clarification':
+      if (
+        input.action?.details?.clarification === 'lead' ||
+        input.action?.details?.clarification === 'user'
+      ) {
+        return `Set clarification to ${input.action.details.clarification}`;
+      }
+      if (input.action?.details && 'clarification' in input.action.details) {
+        return 'Cleared clarification';
+      }
+      return 'Updated clarification';
+    case 'task_set_owner':
+      if (typeof input.action?.details?.owner === 'string' && input.action.details.owner.trim()) {
+        return `Assigned owner to ${input.action.details.owner}`;
+      }
+      if (input.action?.details && 'owner' in input.action.details) {
+        return 'Cleared owner';
+      }
+      return 'Updated owner';
+    case 'kanban_set_column':
+      return 'Updated column';
+    default:
+      if (input.linkKind === 'execution') {
+        return 'Worked on task';
+      }
+      if (input.linkKind === 'lifecycle') {
+        return 'Updated task lifecycle';
+      }
+      return 'Performed a related board action';
+  }
+}

test/main/ipc/teams.test.ts

@@ -1,6 +1,14 @@
 import * as os from 'os';
 import { beforeEach, describe, expect, it, vi } from 'vitest';
-import type { InboxMessage, TeamCreateRequest, TeamProvisioningProgress } from '@shared/types/team';
+import type {
+  BoardTaskActivityEntry,
+  BoardTaskLogStreamResponse,
+  BoardTaskExactLogDetailResult,
+  BoardTaskExactLogSummariesResponse,
+  InboxMessage,
+  TeamCreateRequest,
+  TeamProvisioningProgress,
+} from '@shared/types/team';
 
 vi.mock('electron', () => ({
   app: { getLocale: vi.fn(() => 'en'), getPath: vi.fn(() => '/tmp') },
@@ -64,6 +72,10 @@ import {
   TEAM_SET_CHANGE_PRESENCE_TRACKING,
   TEAM_GET_ALL_TASKS,
   TEAM_GET_LOGS_FOR_TASK,
+  TEAM_GET_TASK_ACTIVITY,
+  TEAM_GET_TASK_LOG_STREAM,
+  TEAM_GET_TASK_EXACT_LOG_DETAIL,
+  TEAM_GET_TASK_EXACT_LOG_SUMMARIES,
   TEAM_GET_MEMBER_LOGS,
   TEAM_GET_MEMBER_STATS,
   TEAM_START_TASK,
@@ -186,6 +198,25 @@ describe('ipc teams handlers', () => {
     getLeadActivityState: vi.fn(() => 'idle'),
     stopTeam: vi.fn(() => undefined),
   };
+  const boardTaskActivityService = {
+    getTaskActivity: vi.fn<() => Promise<BoardTaskActivityEntry[]>>(async () => []),
+  };
+  const boardTaskLogStreamService = {
+    getTaskLogStream:
+      vi.fn<() => Promise<BoardTaskLogStreamResponse>>(async () => ({
+        participants: [],
+        defaultFilter: 'all',
+        segments: [],
+      })),
+  };
+  const boardTaskExactLogsService = {
+    getTaskExactLogSummaries:
+      vi.fn<() => Promise<BoardTaskExactLogSummariesResponse>>(async () => ({ items: [] })),
+  };
+  const boardTaskExactLogDetailService = {
+    getTaskExactLogDetail:
+      vi.fn<() => Promise<BoardTaskExactLogDetailResult>>(async () => ({ status: 'missing' })),
+  };
 
   beforeEach(() => {
     handlers.clear();
@@ -195,7 +226,19 @@ describe('ipc teams handlers', () => {
     mockTeamDataWorkerClient.isAvailable.mockReturnValue(false);
     mockTeamDataWorkerClient.getTeamData.mockReset();
     mockTeamDataWorkerClient.findLogsForTask.mockReset();
-    initializeTeamHandlers(service as never, provisioningService as never);
+    initializeTeamHandlers(
+      service as never,
+      provisioningService as never,
+      undefined,
+      undefined,
+      undefined,
+      undefined,
+      undefined,
+      boardTaskActivityService as never,
+      boardTaskLogStreamService as never,
+      boardTaskExactLogsService as never,
+      boardTaskExactLogDetailService as never,
+    );
     registerTeamHandlers(ipcMain as never);
   });
 
@@ -224,6 +267,10 @@ describe('ipc teams handlers', () => {
     expect(handlers.has(TEAM_CREATE_CONFIG)).toBe(true);
     expect(handlers.has(TEAM_GET_MEMBER_LOGS)).toBe(true);
     expect(handlers.has(TEAM_GET_LOGS_FOR_TASK)).toBe(true);
+    expect(handlers.has(TEAM_GET_TASK_ACTIVITY)).toBe(true);
+    expect(handlers.has(TEAM_GET_TASK_LOG_STREAM)).toBe(true);
+    expect(handlers.has(TEAM_GET_TASK_EXACT_LOG_SUMMARIES)).toBe(true);
+    expect(handlers.has(TEAM_GET_TASK_EXACT_LOG_DETAIL)).toBe(true);
     expect(handlers.has(TEAM_GET_MEMBER_STATS)).toBe(true);
     expect(handlers.has(TEAM_UPDATE_CONFIG)).toBe(true);
     expect(handlers.has(TEAM_GET_ALL_TASKS)).toBe(true);
@@ -279,6 +326,149 @@ describe('ipc teams handlers', () => {
     expect(service.getTaskChangePresence).toHaveBeenCalledWith('my-team');
   });
 
+  it('returns explicit exact task-log summaries for a task', async () => {
+    boardTaskExactLogsService.getTaskExactLogSummaries.mockResolvedValueOnce({
+      items: [
+        {
+          id: 'tool:/tmp/task.jsonl:tool-1',
+          timestamp: '2026-04-12T16:00:00.000Z',
+          actor: {
+            memberName: 'alice',
+            role: 'member',
+            sessionId: 'session-1',
+            agentId: 'agent-1',
+            isSidechain: true,
+          },
+          source: {
+            filePath: '/tmp/task.jsonl',
+            messageUuid: 'msg-1',
+            toolUseId: 'tool-1',
+            sourceOrder: 1,
+          },
+          anchorKind: 'tool',
+          actionLabel: 'Added a comment',
+          actionCategory: 'comment',
+          canonicalToolName: 'task_add_comment',
+          linkKinds: ['board_action'],
+          canLoadDetail: true,
+          sourceGeneration: 'gen-1',
+        },
+      ],
+    });
+
+    const handler = handlers.get(TEAM_GET_TASK_EXACT_LOG_SUMMARIES);
+    expect(handler).toBeDefined();
+
+    const result = (await handler!(
+      {} as never,
+      'my-team',
+      '123e4567-e89b-12d3-a456-426614174000'
+    )) as {
+      success: boolean;
+      data?: BoardTaskExactLogSummariesResponse;
+    };
+
+    expect(result.success).toBe(true);
+    expect(result.data?.items).toHaveLength(1);
+    expect(boardTaskExactLogsService.getTaskExactLogSummaries).toHaveBeenCalledWith(
+      'my-team',
+      '123e4567-e89b-12d3-a456-426614174000'
+    );
+  });
+
+  it('returns one task log stream for a task', async () => {
+    boardTaskLogStreamService.getTaskLogStream.mockResolvedValueOnce({
+      participants: [
+        {
+          key: 'member:alice',
+          label: 'alice',
+          role: 'member',
+          isLead: false,
+          isSidechain: true,
+        },
+      ],
+      defaultFilter: 'all',
+      segments: [],
+    });
+
+    const handler = handlers.get(TEAM_GET_TASK_LOG_STREAM);
+    expect(handler).toBeDefined();
+
+    const result = (await handler!(
+      {} as never,
+      'my-team',
+      '123e4567-e89b-12d3-a456-426614174000'
+    )) as {
+      success: boolean;
+      data?: BoardTaskLogStreamResponse;
+    };
+
+    expect(result.success).toBe(true);
+    expect(result.data?.participants).toHaveLength(1);
+    expect(boardTaskLogStreamService.getTaskLogStream).toHaveBeenCalledWith(
+      'my-team',
+      '123e4567-e89b-12d3-a456-426614174000'
+    );
+  });
+
+  it('returns exact task-log detail for a task bundle', async () => {
+    boardTaskExactLogDetailService.getTaskExactLogDetail.mockResolvedValueOnce({
+      status: 'ok',
+      detail: {
+        id: 'tool:/tmp/task.jsonl:tool-1',
+        chunks: [],
+      },
+    });
+
+    const handler = handlers.get(TEAM_GET_TASK_EXACT_LOG_DETAIL);
+    expect(handler).toBeDefined();
+
+    const result = (await handler!(
+      {} as never,
+      'my-team',
+      '123e4567-e89b-12d3-a456-426614174000',
+      'tool:/tmp/task.jsonl:tool-1',
+      'gen-1'
+    )) as {
+      success: boolean;
+      data?: BoardTaskExactLogDetailResult;
+    };
+
+    expect(result.success).toBe(true);
+    expect(result.data?.status).toBe('ok');
+    expect(boardTaskExactLogDetailService.getTaskExactLogDetail).toHaveBeenCalledWith(
+      'my-team',
+      '123e4567-e89b-12d3-a456-426614174000',
+      'tool:/tmp/task.jsonl:tool-1',
+      'gen-1'
+    );
+  });
+
+  it('returns exact task-log detail stale status without rewriting the service result', async () => {
+    boardTaskExactLogDetailService.getTaskExactLogDetail.mockResolvedValueOnce({
+      status: 'stale',
+    });
+
+    const handler = handlers.get(TEAM_GET_TASK_EXACT_LOG_DETAIL);
+    expect(handler).toBeDefined();
+
+    const result = (await handler!(
+      {} as never,
+      'my-team',
+      '123e4567-e89b-12d3-a456-426614174000',
+      'tool:/tmp/task.jsonl:tool-1',
+      'gen-2'
+    )) as {
+      success: boolean;
+      data?: BoardTaskExactLogDetailResult;
+    };
+
+    expect(result).toEqual({
+      success: true,
+      data: { status: 'stale' },
+    });
+  });
+
   it('returns success false on invalid sendMessage args', async () => {
     const sendHandler = handlers.get(TEAM_SEND_MESSAGE);
     expect(sendHandler).toBeDefined();
@@ -893,6 +1083,8 @@ describe('ipc teams handlers', () => {
     expect(handlers.has(TEAM_CREATE_CONFIG)).toBe(false);
     expect(handlers.has(TEAM_GET_MEMBER_LOGS)).toBe(false);
     expect(handlers.has(TEAM_GET_LOGS_FOR_TASK)).toBe(false);
+    expect(handlers.has(TEAM_GET_TASK_ACTIVITY)).toBe(false);
+    expect(handlers.has(TEAM_GET_TASK_LOG_STREAM)).toBe(false);
     expect(handlers.has(TEAM_GET_MEMBER_STATS)).toBe(false);
     expect(handlers.has(TEAM_UPDATE_CONFIG)).toBe(false);
     expect(handlers.has(TEAM_GET_ALL_TASKS)).toBe(false);
@@ -922,6 +1114,46 @@ describe('ipc teams handlers', () => {
     expect(handlers.has(TEAM_DELETE_TASK_ATTACHMENT)).toBe(false);
   });
 
+  it('returns explicit task activity rows', async () => {
+    const handler = handlers.get(TEAM_GET_TASK_ACTIVITY);
+    expect(handler).toBeDefined();
+
+    const activityRows: BoardTaskActivityEntry[] = [
+      {
+        id: 'activity-1',
+        timestamp: '2026-04-12T10:00:00.000Z',
+        task: {
+          locator: { ref: 'abcd1234', refKind: 'display' },
+          resolution: 'resolved',
+        },
+        linkKind: 'lifecycle',
+        targetRole: 'subject',
+        actor: {
+          role: 'lead',
+          sessionId: 'session-1',
+          isSidechain: false,
+        },
+        actorContext: {
+          relation: 'idle',
+        },
+        source: {
+          messageUuid: 'message-1',
+          filePath: '/tmp/transcript.jsonl',
+          sourceOrder: 1,
+        },
+      },
+    ];
+    boardTaskActivityService.getTaskActivity.mockResolvedValueOnce(activityRows);
+
+    const result = (await handler!({} as never, 'my-team', 'task-1')) as {
+      success: boolean;
+      data: typeof activityRows;
+    };
+
+    expect(result).toEqual({ success: true, data: activityRows });
+    expect(boardTaskActivityService.getTaskActivity).toHaveBeenCalledWith('my-team', 'task-1');
+  });
+
   describe('addTaskRelationship', () => {
     it('calls service on valid input', async () => {
       const handler = handlers.get(TEAM_ADD_TASK_RELATIONSHIP)!;

test/main/services/team/BoardTaskActivityEntryBuilder.test.ts

@@ -0,0 +1,427 @@
+import { describe, expect, it } from 'vitest';
+
+import { BoardTaskActivityEntryBuilder } from '../../../../src/main/services/team/taskLogs/activity/BoardTaskActivityEntryBuilder';
+
+import type { TeamTask } from '../../../../src/shared/types/team';
+import type { RawTaskActivityMessage } from '../../../../src/main/services/team/taskLogs/activity/BoardTaskActivityTranscriptReader';
+
+function makeTask(task: Partial<TeamTask> & Pick<TeamTask, 'id' | 'subject' | 'status'>): TeamTask {
+  return {
+    displayId: task.displayId ?? task.id.slice(0, 8),
+    createdAt: '2026-04-12T10:00:00.000Z',
+    updatedAt: '2026-04-12T10:00:00.000Z',
+    ...task,
+  };
+}
+
+describe('BoardTaskActivityEntryBuilder', () => {
+  it('builds same-task execution rows and external board actions', () => {
+    const taskA = makeTask({
+      id: '123e4567-e89b-12d3-a456-426614174000',
+      displayId: 'abcd1234',
+      subject: 'Task A',
+      status: 'in_progress',
+    });
+    const taskB = makeTask({
+      id: '123e4567-e89b-12d3-a456-426614174001',
+      displayId: 'efgh5678',
+      subject: 'Task B',
+      status: 'pending',
+    });
+
+    const messages: RawTaskActivityMessage[] = [
+      {
+        filePath: '/tmp/a.jsonl',
+        uuid: 'msg-1',
+        timestamp: '2026-04-12T10:00:00.000Z',
+        sessionId: 'session-1',
+        agentId: 'agent-a',
+        agentName: 'alice',
+        isSidechain: true,
+        sourceOrder: 1,
+        boardTaskLinks: [
+          {
+            schemaVersion: 1,
+            task: { ref: 'abcd1234', refKind: 'display', canonicalId: taskA.id },
+            targetRole: 'subject',
+            linkKind: 'execution',
+            actorContext: { relation: 'same_task' },
+          },
+        ],
+        boardTaskToolActions: [],
+      },
+      {
+        filePath: '/tmp/b.jsonl',
+        uuid: 'msg-2',
+        timestamp: '2026-04-12T10:01:00.000Z',
+        sessionId: 'session-1',
+        agentId: 'agent-a',
+        agentName: 'alice',
+        isSidechain: true,
+        sourceOrder: 2,
+        boardTaskLinks: [
+          {
+            schemaVersion: 1,
+            toolUseId: 'tool-2',
+            task: { ref: 'abcd1234', refKind: 'display', canonicalId: taskA.id },
+            targetRole: 'subject',
+            linkKind: 'board_action',
+            actorContext: {
+              relation: 'other_active_task',
+              activeTask: { ref: 'efgh5678', refKind: 'display', canonicalId: taskB.id },
+              activePhase: 'work',
+              activeExecutionSeq: 2,
+            },
+          },
+        ],
+        boardTaskToolActions: [
+          {
+            schemaVersion: 1,
+            toolUseId: 'tool-2',
+            canonicalToolName: 'task_add_comment',
+            resultRefs: { commentId: 'comment-1' },
+          },
+        ],
+      },
+    ];
+
+    const entries = new BoardTaskActivityEntryBuilder().buildForTask({
+      teamName: 'demo',
+      targetTask: taskA,
+      tasks: [taskA, taskB],
+      messages,
+    });
+
+    expect(entries).toHaveLength(2);
+    expect(entries[0]?.linkKind).toBe('execution');
+    expect(entries[1]?.actorContext.relation).toBe('other_active_task');
+    expect(entries[1]?.action?.canonicalToolName).toBe('task_add_comment');
+    expect(entries[1]?.action?.category).toBe('comment');
+    expect(entries[1]?.action?.details?.commentId).toBe('comment-1');
+  });
+
+  it('marks display-id collisions as ambiguous instead of guessing', () => {
+    const liveTask = makeTask({
+      id: '123e4567-e89b-12d3-a456-426614174000',
+      displayId: 'abcd1234',
+      subject: 'Live task',
+      status: 'in_progress',
+    });
+    const deletedTask = makeTask({
+      id: '123e4567-e89b-12d3-a456-426614174099',
+      displayId: 'abcd1234',
+      subject: 'Deleted task',
+      status: 'deleted',
+    });
+
+    const messages: RawTaskActivityMessage[] = [
+      {
+        filePath: '/tmp/a.jsonl',
+        uuid: 'msg-1',
+        timestamp: '2026-04-12T10:00:00.000Z',
+        sessionId: 'session-1',
+        isSidechain: true,
+        sourceOrder: 1,
+        boardTaskLinks: [
+          {
+            schemaVersion: 1,
+            task: { ref: 'abcd1234', refKind: 'display' },
+            targetRole: 'subject',
+            linkKind: 'board_action',
+            actorContext: { relation: 'idle' },
+          },
+        ],
+        boardTaskToolActions: [],
+      },
+    ];
+
+    const entries = new BoardTaskActivityEntryBuilder().buildForTask({
+      teamName: 'demo',
+      targetTask: liveTask,
+      tasks: [liveTask, deletedTask],
+      messages,
+    });
+
+    expect(entries).toHaveLength(1);
+    expect(entries[0]?.task.resolution).toBe('ambiguous');
+  });
+
+  it('preserves deleted peer tasks on relationship rows', () => {
+    const taskA = makeTask({
+      id: '123e4567-e89b-12d3-a456-426614174000',
+      displayId: 'abcd1234',
+      subject: 'Task A',
+      status: 'in_progress',
+    });
+    const deletedPeer = makeTask({
+      id: '123e4567-e89b-12d3-a456-426614174002',
+      displayId: 'ijkl9012',
+      subject: 'Task B',
+      status: 'deleted',
+    });
+
+    const messages: RawTaskActivityMessage[] = [
+      {
+        filePath: '/tmp/relationships.jsonl',
+        uuid: 'msg-3',
+        timestamp: '2026-04-12T10:00:00.000Z',
+        sessionId: 'session-1',
+        agentName: 'lead',
+        isSidechain: false,
+        sourceOrder: 1,
+        boardTaskLinks: [
+          {
+            schemaVersion: 1,
+            toolUseId: 'tool-3',
+            task: { ref: 'abcd1234', refKind: 'display', canonicalId: taskA.id },
+            targetRole: 'subject',
+            linkKind: 'board_action',
+            actorContext: { relation: 'idle' },
+          },
+          {
+            schemaVersion: 1,
+            toolUseId: 'tool-3',
+            task: { ref: 'ijkl9012', refKind: 'display', canonicalId: deletedPeer.id },
+            targetRole: 'related',
+            linkKind: 'board_action',
+            actorContext: { relation: 'idle' },
+          },
+        ],
+        boardTaskToolActions: [
+          {
+            schemaVersion: 1,
+            toolUseId: 'tool-3',
+            canonicalToolName: 'task_link',
+            input: { relationship: 'related' },
+          },
+        ],
+      },
+    ];
+
+    const entries = new BoardTaskActivityEntryBuilder().buildForTask({
+      teamName: 'demo',
+      targetTask: taskA,
+      tasks: [taskA, deletedPeer],
+      messages,
+    });
+
+    expect(entries).toHaveLength(1);
+    expect(entries[0]?.action?.peerTask?.resolution).toBe('deleted');
+    expect(entries[0]?.action?.details?.relationship).toBe('related');
+    expect(entries[0]?.action?.category).toBe('relationship');
+    expect(entries[0]?.action?.relationshipPerspective).toBe('symmetric');
+  });
+
+  it('resolves display locators case-insensitively and canonical-like unknown refs safely', () => {
+    const taskA = makeTask({
+      id: '123e4567-e89b-12d3-a456-426614174000',
+      displayId: 'abcd1234',
+      subject: 'Task A',
+      status: 'in_progress',
+    });
+
+    const messages: RawTaskActivityMessage[] = [
+      {
+        filePath: '/tmp/case.jsonl',
+        uuid: 'msg-4',
+        timestamp: '2026-04-12T10:00:00.000Z',
+        sessionId: 'session-1',
+        isSidechain: false,
+        sourceOrder: 1,
+        boardTaskLinks: [
+          {
+            schemaVersion: 1,
+            task: { ref: 'ABCD1234', refKind: 'display' },
+            targetRole: 'subject',
+            linkKind: 'board_action',
+            actorContext: { relation: 'idle' },
+          },
+          {
+            schemaVersion: 1,
+            task: { ref: taskA.id, refKind: 'unknown' },
+            targetRole: 'subject',
+            linkKind: 'execution',
+            actorContext: { relation: 'same_task' },
+          },
+        ],
+        boardTaskToolActions: [],
+      },
+    ];
+
+    const entries = new BoardTaskActivityEntryBuilder().buildForTask({
+      teamName: 'demo',
+      targetTask: taskA,
+      tasks: [taskA],
+      messages,
+    });
+
+    expect(entries).toHaveLength(2);
+    expect(entries[0]?.task.resolution).toBe('resolved');
+    expect(entries[1]?.task.resolution).toBe('resolved');
+  });
+
+  it('marks main-session actor without explicit name as unknown instead of forcing lead', () => {
+    const taskA = makeTask({
+      id: '123e4567-e89b-12d3-a456-426614174000',
+      displayId: 'abcd1234',
+      subject: 'Task A',
+      status: 'in_progress',
+    });
+
+    const messages: RawTaskActivityMessage[] = [
+      {
+        filePath: '/tmp/unknown-actor.jsonl',
+        uuid: 'msg-5',
+        timestamp: '2026-04-12T10:00:00.000Z',
+        sessionId: 'session-1',
+        isSidechain: false,
+        sourceOrder: 1,
+        boardTaskLinks: [
+          {
+            schemaVersion: 1,
+            task: { ref: 'abcd1234', refKind: 'display', canonicalId: taskA.id },
+            targetRole: 'subject',
+            linkKind: 'board_action',
+            actorContext: { relation: 'idle' },
+          },
+        ],
+        boardTaskToolActions: [],
+      },
+    ];
+
+    const entries = new BoardTaskActivityEntryBuilder().buildForTask({
+      teamName: 'demo',
+      targetTask: taskA,
+      tasks: [taskA],
+      messages,
+    });
+
+    expect(entries).toHaveLength(1);
+    expect(entries[0]?.actor.role).toBe('unknown');
+  });
+
+  it('never joins action payloads onto execution rows', () => {
+    const taskA = makeTask({
+      id: '123e4567-e89b-12d3-a456-426614174000',
+      displayId: 'abcd1234',
+      subject: 'Task A',
+      status: 'in_progress',
+    });
+
+    const messages: RawTaskActivityMessage[] = [
+      {
+        filePath: '/tmp/execution-malformed.jsonl',
+        uuid: 'msg-6',
+        timestamp: '2026-04-12T10:00:00.000Z',
+        sessionId: 'session-1',
+        agentId: 'agent-a',
+        agentName: 'alice',
+        isSidechain: true,
+        sourceOrder: 1,
+        boardTaskLinks: [
+          {
+            schemaVersion: 1,
+            toolUseId: 'tool-1',
+            task: { ref: 'abcd1234', refKind: 'display', canonicalId: taskA.id },
+            targetRole: 'subject',
+            linkKind: 'execution',
+            actorContext: { relation: 'same_task' },
+          },
+        ],
+        boardTaskToolActions: [
+          {
+            schemaVersion: 1,
+            toolUseId: 'tool-1',
+            canonicalToolName: 'task_start',
+          },
+        ],
+      },
+    ];
+
+    const entries = new BoardTaskActivityEntryBuilder().buildForTask({
+      teamName: 'demo',
+      targetTask: taskA,
+      tasks: [taskA],
+      messages,
+    });
+
+    expect(entries).toHaveLength(1);
+    expect(entries[0]?.linkKind).toBe('execution');
+    expect(entries[0]?.action).toBeUndefined();
+  });
+
+  it('derives relationship perspective from target role', () => {
+    const taskA = makeTask({
+      id: '123e4567-e89b-12d3-a456-426614174010',
+      displayId: 'taska010',
+      subject: 'Task A',
+      status: 'in_progress',
+    });
+    const taskB = makeTask({
+      id: '123e4567-e89b-12d3-a456-426614174011',
+      displayId: 'taskb011',
+      subject: 'Task B',
+      status: 'pending',
+    });
+
+    const messages: RawTaskActivityMessage[] = [
+      {
+        filePath: '/tmp/relationship-perspective.jsonl',
+        uuid: 'msg-7',
+        timestamp: '2026-04-12T10:00:00.000Z',
+        sessionId: 'session-1',
+        agentName: 'lead',
+        isSidechain: false,
+        sourceOrder: 1,
+        boardTaskLinks: [
+          {
+            schemaVersion: 1,
+            toolUseId: 'tool-7',
+            task: { ref: 'taska010', refKind: 'display', canonicalId: taskA.id },
+            targetRole: 'subject',
+            linkKind: 'board_action',
+            actorContext: { relation: 'idle' },
+          },
+          {
+            schemaVersion: 1,
+            toolUseId: 'tool-7',
+            task: { ref: 'taskb011', refKind: 'display', canonicalId: taskB.id },
+            targetRole: 'related',
+            linkKind: 'board_action',
+            actorContext: { relation: 'idle' },
+          },
+        ],
+        boardTaskToolActions: [
+          {
+            schemaVersion: 1,
+            toolUseId: 'tool-7',
+            canonicalToolName: 'task_link',
+            input: { relationship: 'blocked-by' },
+          },
+        ],
+      },
+    ];
+
+    const builder = new BoardTaskActivityEntryBuilder();
+    const entriesForTaskA = builder.buildForTask({
+      teamName: 'demo',
+      targetTask: taskA,
+      tasks: [taskA, taskB],
+      messages,
+    });
+    const entriesForTaskB = builder.buildForTask({
+      teamName: 'demo',
+      targetTask: taskB,
+      tasks: [taskA, taskB],
+      messages,
+    });
+
+    expect(entriesForTaskA).toHaveLength(1);
+    expect(entriesForTaskA[0]?.action?.relationshipPerspective).toBe('incoming');
+    expect(entriesForTaskA[0]?.action?.peerTask?.taskRef?.taskId).toBe(taskB.id);
+
+    expect(entriesForTaskB).toHaveLength(1);
+    expect(entriesForTaskB[0]?.action?.relationshipPerspective).toBe('outgoing');
+    expect(entriesForTaskB[0]?.action?.peerTask?.taskRef?.taskId).toBe(taskA.id);
+  });
+});

test/main/services/team/BoardTaskActivityRecordSource.test.ts

@@ -0,0 +1,82 @@
+import { describe, expect, it, vi } from 'vitest';
+
+import { BoardTaskActivityRecordSource } from '../../../../src/main/services/team/taskLogs/activity/BoardTaskActivityRecordSource';
+
+describe('BoardTaskActivityRecordSource', () => {
+  it('uses active and deleted tasks together when building explicit task records', async () => {
+    const targetTask = {
+      id: 'task-a',
+      displayId: 'abcd1234',
+      subject: 'A',
+      status: 'pending',
+    };
+    const deletedTask = {
+      id: 'task-b',
+      displayId: 'deadbeef',
+      subject: 'B',
+      status: 'deleted',
+    };
+    const transcriptFiles = ['/tmp/a.jsonl'];
+    const rawMessages = [{ uuid: 'm1' }];
+    const builtRecords = [{ id: 'r1' }];
+
+    const locator = {
+      listTranscriptFiles: vi.fn(async () => transcriptFiles),
+    };
+    const taskReader = {
+      getTasks: vi.fn(async () => [targetTask]),
+      getDeletedTasks: vi.fn(async () => [deletedTask]),
+    };
+    const transcriptReader = {
+      readFiles: vi.fn(async () => rawMessages),
+    };
+    const recordBuilder = {
+      buildForTask: vi.fn(() => builtRecords),
+    };
+
+    const source = new BoardTaskActivityRecordSource(
+      locator as never,
+      taskReader as never,
+      transcriptReader as never,
+      recordBuilder as never,
+    );
+
+    const result = await source.getTaskRecords('demo', 'task-a');
+
+    expect(result).toBe(builtRecords);
+    expect(locator.listTranscriptFiles).toHaveBeenCalledWith('demo');
+    expect(transcriptReader.readFiles).toHaveBeenCalledWith(transcriptFiles);
+    expect(recordBuilder.buildForTask).toHaveBeenCalledWith({
+      teamName: 'demo',
+      targetTask,
+      tasks: [targetTask, deletedTask],
+      messages: rawMessages,
+    });
+  });
+
+  it('returns empty when the target task is unknown', async () => {
+    const locator = {
+      listTranscriptFiles: vi.fn(async () => ['/tmp/a.jsonl']),
+    };
+    const taskReader = {
+      getTasks: vi.fn(async () => []),
+      getDeletedTasks: vi.fn(async () => []),
+    };
+    const transcriptReader = {
+      readFiles: vi.fn(async () => [{ uuid: 'm1' }]),
+    };
+    const recordBuilder = {
+      buildForTask: vi.fn(() => [{ id: 'r1' }]),
+    };
+
+    const source = new BoardTaskActivityRecordSource(
+      locator as never,
+      taskReader as never,
+      transcriptReader as never,
+      recordBuilder as never,
+    );
+
+    await expect(source.getTaskRecords('demo', 'task-missing')).resolves.toEqual([]);
+    expect(recordBuilder.buildForTask).not.toHaveBeenCalled();
+  });
+});

test/main/services/team/BoardTaskActivityTranscriptReader.test.ts

@@ -0,0 +1,67 @@
+import * as fs from 'fs/promises';
+import * as os from 'os';
+import * as path from 'path';
+
+import { afterEach, describe, expect, it } from 'vitest';
+
+import { BoardTaskActivityTranscriptReader } from '../../../../src/main/services/team/taskLogs/activity/BoardTaskActivityTranscriptReader';
+
+const tempPaths: string[] = [];
+
+async function createTempTranscript(lines: unknown[]): Promise<string> {
+  const dir = await fs.mkdtemp(path.join(os.tmpdir(), 'board-task-activity-'));
+  const filePath = path.join(dir, 'transcript.jsonl');
+  tempPaths.push(dir);
+  await fs.writeFile(
+    filePath,
+    lines.map(line => JSON.stringify(line)).join('\n'),
+    'utf8',
+  );
+  return filePath;
+}
+
+afterEach(async () => {
+  await Promise.all(
+    tempPaths.splice(0).map(dir => fs.rm(dir, { recursive: true, force: true })),
+  );
+});
+
+describe('BoardTaskActivityTranscriptReader', () => {
+  it('skips transcript rows without a stable timestamp', async () => {
+    const filePath = await createTempTranscript([
+      {
+        uuid: 'missing-timestamp',
+        sessionId: 'session-1',
+        boardTaskLinks: [
+          {
+            schemaVersion: 1,
+            task: { ref: 'abcd1234', refKind: 'display' },
+            targetRole: 'subject',
+            linkKind: 'execution',
+            actorContext: { relation: 'same_task' },
+          },
+        ],
+      },
+      {
+        uuid: 'valid-row',
+        timestamp: '2026-04-12T10:00:00.000Z',
+        sessionId: 'session-1',
+        boardTaskLinks: [
+          {
+            schemaVersion: 1,
+            task: { ref: 'abcd1234', refKind: 'display' },
+            targetRole: 'subject',
+            linkKind: 'execution',
+            actorContext: { relation: 'same_task' },
+          },
+        ],
+      },
+    ]);
+
+    const rows = await new BoardTaskActivityTranscriptReader().readFiles([filePath]);
+
+    expect(rows).toHaveLength(1);
+    expect(rows[0]?.uuid).toBe('valid-row');
+    expect(rows[0]?.timestamp).toBe('2026-04-12T10:00:00.000Z');
+  });
+});

test/main/services/team/BoardTaskExactLogChunkBuilder.test.ts

@@ -0,0 +1,40 @@
+import { describe, expect, it, vi } from 'vitest';
+
+import { BoardTaskExactLogChunkBuilder } from '../../../../src/main/services/team/taskLogs/exact/BoardTaskExactLogChunkBuilder';
+
+import type { EnhancedChunk, ParsedMessage } from '../../../../src/main/types';
+
+describe('BoardTaskExactLogChunkBuilder', () => {
+  it('delegates to ChunkBuilder with includeSidechain enabled', () => {
+    const buildChunks = vi.fn<() => EnhancedChunk[]>(() => []);
+    const messages = [{ uuid: 'm1' }] as unknown as ParsedMessage[];
+
+    const builder = new BoardTaskExactLogChunkBuilder({ buildChunks } as never);
+    const result = builder.buildBundleChunks(messages);
+
+    expect(result).toEqual([]);
+    expect(buildChunks).toHaveBeenCalledWith(messages, [], { includeSidechain: true });
+  });
+
+  it('does not crash on a minimal assistant-only bundle', () => {
+    const messages: ParsedMessage[] = [
+      {
+        uuid: 'assistant-1',
+        parentUuid: null,
+        type: 'assistant',
+        timestamp: new Date('2026-04-12T18:00:00.000Z'),
+        role: 'assistant',
+        content: [{ type: 'text', text: 'done' } as never],
+        toolCalls: [],
+        toolResults: [],
+        isSidechain: true,
+        isMeta: false,
+        isCompactSummary: false,
+      },
+    ];
+
+    const chunks = new BoardTaskExactLogChunkBuilder().buildBundleChunks(messages);
+
+    expect(chunks.length).toBeGreaterThan(0);
+  });
+});

test/main/services/team/BoardTaskExactLogDetailSelector.test.ts

@@ -0,0 +1,305 @@
+import { describe, expect, it } from 'vitest';
+
+import { BoardTaskExactLogDetailSelector } from '../../../../src/main/services/team/taskLogs/exact/BoardTaskExactLogDetailSelector';
+
+import type { ParsedMessage } from '../../../../src/main/types';
+import type { BoardTaskActivityRecord } from '../../../../src/main/services/team/taskLogs/activity/BoardTaskActivityRecord';
+import type { BoardTaskExactLogBundleCandidate } from '../../../../src/main/services/team/taskLogs/exact/BoardTaskExactLogTypes';
+
+function makeRecord(): BoardTaskActivityRecord {
+  return {
+    id: 'record-1',
+    timestamp: '2026-04-12T16:00:00.000Z',
+    task: {
+      locator: { ref: 'abcd1234', refKind: 'display', canonicalId: 'task-a' },
+      resolution: 'resolved',
+    },
+    linkKind: 'board_action',
+    targetRole: 'subject',
+    actor: {
+      memberName: 'alice',
+      role: 'member',
+      sessionId: 'session-1',
+      agentId: 'agent-1',
+      isSidechain: true,
+    },
+    actorContext: { relation: 'same_task' },
+    action: {
+      canonicalToolName: 'task_add_comment',
+      toolUseId: 'tool-1',
+      category: 'comment',
+    },
+    source: {
+      filePath: '/tmp/task.jsonl',
+      messageUuid: 'assistant-1',
+      toolUseId: 'tool-1',
+      sourceOrder: 1,
+    },
+  };
+}
+
+function makeCandidate(records: BoardTaskActivityRecord[]): BoardTaskExactLogBundleCandidate {
+  return {
+    id: 'tool:/tmp/task.jsonl:tool-1',
+    timestamp: '2026-04-12T16:00:00.000Z',
+    actor: records[0]!.actor,
+    source: {
+      filePath: '/tmp/task.jsonl',
+      messageUuid: 'assistant-1',
+      toolUseId: 'tool-1',
+      sourceOrder: 1,
+    },
+    records,
+    anchor: {
+      kind: 'tool',
+      filePath: '/tmp/task.jsonl',
+      messageUuid: 'assistant-1',
+      toolUseId: 'tool-1',
+    },
+    actionLabel: 'Added a comment',
+    actionCategory: 'comment',
+    canonicalToolName: 'task_add_comment',
+    linkKinds: ['board_action'],
+    targetRoles: ['subject'],
+    canLoadDetail: true,
+    sourceGeneration: 'gen-1',
+  };
+}
+
+describe('BoardTaskExactLogDetailSelector', () => {
+  it('keeps the matched tool flow, preserves anchor output, and deduplicates assistant streaming rows anchor-aware', () => {
+    const records = [makeRecord()];
+    const candidate = makeCandidate(records);
+    const parsedMessagesByFile = new Map<string, ParsedMessage[]>([
+      [
+        '/tmp/task.jsonl',
+        [
+          {
+            uuid: 'assistant-0',
+            parentUuid: null,
+            type: 'assistant',
+            timestamp: new Date('2026-04-12T16:00:00.000Z'),
+            role: 'assistant',
+            content: [
+              { type: 'thinking', thinking: 'draft' } as never,
+              { type: 'text', text: 'old tool draft' } as never,
+              { type: 'tool_use', id: 'tool-1', name: 'task_add_comment', input: { taskId: 'x' } } as never,
+            ],
+            toolCalls: [],
+            toolResults: [],
+            requestId: 'req-1',
+            isSidechain: true,
+            isMeta: false,
+            isCompactSummary: false,
+          },
+          {
+            uuid: 'assistant-1',
+            parentUuid: null,
+            type: 'assistant',
+            timestamp: new Date('2026-04-12T16:00:01.000Z'),
+            role: 'assistant',
+            content: [
+              { type: 'text', text: 'stream tail without anchor tool call' } as never,
+              { type: 'tool_use', id: 'tool-2', name: 'task_get', input: { taskId: 'y' } } as never,
+            ],
+            toolCalls: [],
+            toolResults: [],
+            requestId: 'req-1',
+            isSidechain: true,
+            isMeta: false,
+            isCompactSummary: false,
+          },
+          {
+            uuid: 'user-1',
+            parentUuid: null,
+            type: 'user',
+            timestamp: new Date('2026-04-12T16:00:02.000Z'),
+            role: 'user',
+            content: [
+              { type: 'tool_result', tool_use_id: 'tool-1', content: 'ok' } as never,
+              { type: 'tool_result', tool_use_id: 'tool-2', content: 'ignore' } as never,
+            ],
+            toolCalls: [],
+            toolResults: [],
+            sourceToolUseID: 'tool-1',
+            sourceToolAssistantUUID: 'assistant-1',
+            toolUseResult: { output: 'kept' },
+            requestId: 'req-1',
+            isSidechain: true,
+            isMeta: false,
+            isCompactSummary: false,
+          },
+          {
+            uuid: 'assistant-2',
+            parentUuid: null,
+            type: 'assistant',
+            timestamp: new Date('2026-04-12T16:00:03.000Z'),
+            role: 'assistant',
+            content: [{ type: 'text', text: 'comment saved' } as never],
+            toolCalls: [],
+            toolResults: [],
+            sourceToolUseID: 'tool-1',
+            requestId: 'req-2',
+            isSidechain: true,
+            isMeta: false,
+            isCompactSummary: false,
+          },
+        ],
+      ],
+    ]);
+
+    const detail = new BoardTaskExactLogDetailSelector().selectDetail({
+      candidate,
+      records,
+      parsedMessagesByFile,
+    });
+
+    expect(detail).not.toBeNull();
+    expect(detail?.filteredMessages).toHaveLength(3);
+    expect(detail?.filteredMessages[0]?.uuid).toBe('assistant-0');
+    expect(detail?.filteredMessages[1]?.uuid).toBe('user-1');
+    expect(detail?.filteredMessages[2]?.uuid).toBe('assistant-2');
+    expect(detail?.filteredMessages[0]?.toolCalls).toHaveLength(1);
+    expect(detail?.filteredMessages[1]?.toolResults).toHaveLength(1);
+    expect(detail?.filteredMessages[1]?.toolUseResult).toEqual({ output: 'kept' });
+    expect(detail?.filteredMessages[1]?.sourceToolAssistantUUID).toBeUndefined();
+    expect(detail?.filteredMessages[2]?.sourceToolUseID).toBe('tool-1');
+  });
+
+  it('drops stale derived tool metadata when a message-linked row survives filtering', () => {
+    const record = {
+      ...makeRecord(),
+      id: 'record-message-1',
+      source: {
+        filePath: '/tmp/task.jsonl',
+        messageUuid: 'user-2',
+        sourceOrder: 2,
+      },
+      action: undefined,
+    } satisfies BoardTaskActivityRecord;
+    const candidate: BoardTaskExactLogBundleCandidate = {
+      id: 'message:/tmp/task.jsonl:user-2',
+      timestamp: '2026-04-12T16:01:00.000Z',
+      actor: record.actor,
+      source: {
+        filePath: '/tmp/task.jsonl',
+        messageUuid: 'user-2',
+        sourceOrder: 2,
+      },
+      records: [record],
+      anchor: {
+        kind: 'message',
+        filePath: '/tmp/task.jsonl',
+        messageUuid: 'user-2',
+      },
+      actionLabel: 'Worked on task',
+      linkKinds: ['execution'],
+      targetRoles: ['subject'],
+      canLoadDetail: true,
+      sourceGeneration: 'gen-2',
+    };
+    const parsedMessagesByFile = new Map<string, ParsedMessage[]>([
+      [
+        '/tmp/task.jsonl',
+        [
+          {
+            uuid: 'user-2',
+            parentUuid: null,
+            type: 'user',
+            timestamp: new Date('2026-04-12T16:01:00.000Z'),
+            role: 'user',
+            content: [
+              { type: 'text', text: 'status update' } as never,
+              { type: 'tool_result', tool_use_id: 'other-tool', content: 'stale tool result' } as never,
+            ],
+            toolCalls: [],
+            toolResults: [],
+            sourceToolUseID: 'other-tool',
+            sourceToolAssistantUUID: 'assistant-other',
+            toolUseResult: { output: 'stale' },
+            requestId: 'req-2',
+            isSidechain: true,
+            isMeta: false,
+            isCompactSummary: false,
+          },
+        ],
+      ],
+    ]);
+
+    const detail = new BoardTaskExactLogDetailSelector().selectDetail({
+      candidate,
+      records: [record],
+      parsedMessagesByFile,
+    });
+
+    expect(detail).not.toBeNull();
+    expect(detail?.filteredMessages).toHaveLength(1);
+    expect(detail?.filteredMessages[0]?.content).toEqual([{ type: 'text', text: 'status update' }]);
+    expect(detail?.filteredMessages[0]?.toolResults).toEqual([]);
+    expect(detail?.filteredMessages[0]?.sourceToolUseID).toBeUndefined();
+    expect(detail?.filteredMessages[0]?.sourceToolAssistantUUID).toBeUndefined();
+    expect(detail?.filteredMessages[0]?.toolUseResult).toBeUndefined();
+  });
+
+  it('preserves toolUseResult for a matched tool_result even when sourceToolUseID is absent', () => {
+    const records = [makeRecord()];
+    const candidate = makeCandidate(records);
+    const parsedMessagesByFile = new Map<string, ParsedMessage[]>([
+      [
+        '/tmp/task.jsonl',
+        [
+          {
+            uuid: 'assistant-1',
+            parentUuid: null,
+            type: 'assistant',
+            timestamp: new Date('2026-04-12T16:00:00.000Z'),
+            role: 'assistant',
+            content: [
+              { type: 'tool_use', id: 'tool-1', name: 'task_add_comment', input: { taskId: 'x' } } as never,
+            ],
+            toolCalls: [],
+            toolResults: [],
+            requestId: 'req-1',
+            isSidechain: true,
+            isMeta: false,
+            isCompactSummary: false,
+          },
+          {
+            uuid: 'user-1',
+            parentUuid: null,
+            type: 'user',
+            timestamp: new Date('2026-04-12T16:00:01.000Z'),
+            role: 'user',
+            content: [
+              { type: 'tool_result', tool_use_id: 'tool-1', content: 'ok' } as never,
+            ],
+            toolCalls: [],
+            toolResults: [],
+            toolUseResult: {
+              toolUseId: 'tool-1',
+              content: 'ok',
+            },
+            requestId: 'req-1',
+            isSidechain: true,
+            isMeta: false,
+            isCompactSummary: false,
+          },
+        ],
+      ],
+    ]);
+
+    const detail = new BoardTaskExactLogDetailSelector().selectDetail({
+      candidate,
+      records,
+      parsedMessagesByFile,
+    });
+
+    expect(detail).not.toBeNull();
+    expect(detail?.filteredMessages).toHaveLength(2);
+    expect(detail?.filteredMessages[1]?.sourceToolUseID).toBe('tool-1');
+    expect(detail?.filteredMessages[1]?.toolUseResult).toEqual({
+      toolUseId: 'tool-1',
+      content: 'ok',
+    });
+  });
+});

test/main/services/team/BoardTaskExactLogDetailService.test.ts

@@ -0,0 +1,212 @@
+import { describe, expect, it, vi } from 'vitest';
+
+import { BoardTaskExactLogDetailService } from '../../../../src/main/services/team/taskLogs/exact/BoardTaskExactLogDetailService';
+
+import type { BoardTaskActivityRecord } from '../../../../src/main/services/team/taskLogs/activity/BoardTaskActivityRecord';
+import type {
+  BoardTaskExactLogBundleCandidate,
+  BoardTaskExactLogDetailCandidate,
+} from '../../../../src/main/services/team/taskLogs/exact/BoardTaskExactLogTypes';
+
+function makeRecord(): BoardTaskActivityRecord {
+  return {
+    id: 'record-1',
+    timestamp: '2026-04-12T16:00:00.000Z',
+    task: {
+      locator: { ref: 'abcd1234', refKind: 'display', canonicalId: 'task-a' },
+      resolution: 'resolved',
+    },
+    linkKind: 'board_action',
+    targetRole: 'subject',
+    actor: {
+      memberName: 'alice',
+      role: 'member',
+      sessionId: 'session-1',
+      agentId: 'agent-1',
+      isSidechain: true,
+    },
+    actorContext: { relation: 'same_task' },
+    action: {
+      canonicalToolName: 'task_add_comment',
+      toolUseId: 'tool-1',
+      category: 'comment',
+    },
+    source: {
+      filePath: '/tmp/task.jsonl',
+      messageUuid: 'msg-1',
+      toolUseId: 'tool-1',
+      sourceOrder: 1,
+    },
+  };
+}
+
+function makeCandidate(records: BoardTaskActivityRecord[]): BoardTaskExactLogBundleCandidate {
+  return {
+    id: 'tool:/tmp/task.jsonl:tool-1',
+    timestamp: '2026-04-12T16:00:00.000Z',
+    actor: records[0]!.actor,
+    source: {
+      filePath: '/tmp/task.jsonl',
+      messageUuid: 'msg-1',
+      toolUseId: 'tool-1',
+      sourceOrder: 1,
+    },
+    records,
+    anchor: {
+      kind: 'tool',
+      filePath: '/tmp/task.jsonl',
+      messageUuid: 'msg-1',
+      toolUseId: 'tool-1',
+    },
+    actionLabel: 'Added a comment',
+    actionCategory: 'comment',
+    canonicalToolName: 'task_add_comment',
+    linkKinds: ['board_action'],
+    targetRoles: ['subject'],
+    canLoadDetail: true,
+    sourceGeneration: 'gen-1',
+  };
+}
+
+describe('BoardTaskExactLogDetailService', () => {
+  it('returns missing when the exact-log read flag is disabled', async () => {
+    vi.stubEnv('CLAUDE_TEAM_BOARD_TASK_EXACT_LOGS_READ_ENABLED', 'false');
+    const recordSource = { getTaskRecords: vi.fn(async () => []) };
+    const service = new BoardTaskExactLogDetailService(
+      recordSource as never,
+      { selectSummaries: vi.fn() } as never,
+      { parseFiles: vi.fn() } as never,
+      { selectDetail: vi.fn() } as never,
+      { buildBundleChunks: vi.fn() } as never
+    );
+
+    await expect(
+      service.getTaskExactLogDetail('demo', 'task-a', 'tool:/tmp/task.jsonl:tool-1', 'gen-1')
+    ).resolves.toEqual({ status: 'missing' });
+    expect(recordSource.getTaskRecords).not.toHaveBeenCalled();
+    vi.unstubAllEnvs();
+  });
+
+  it('returns stale when the expected source generation no longer matches', async () => {
+    const records = [makeRecord()];
+    const recordSource = { getTaskRecords: vi.fn(async () => records) };
+    const summarySelector = {
+      selectSummaries: vi.fn(() => [makeCandidate(records)]),
+    };
+
+    const service = new BoardTaskExactLogDetailService(
+      recordSource as never,
+      summarySelector as never,
+      { parseFiles: vi.fn() } as never,
+      { selectDetail: vi.fn() } as never,
+      { buildBundleChunks: vi.fn() } as never
+    );
+
+    const result = await service.getTaskExactLogDetail('demo', 'task-a', 'tool:/tmp/task.jsonl:tool-1', 'gen-old');
+
+    expect(result).toEqual({ status: 'stale' });
+  });
+
+  it('returns ok when a matching detail bundle is reconstructed', async () => {
+    const records = [makeRecord()];
+    const candidate = makeCandidate(records);
+    const detailCandidate: BoardTaskExactLogDetailCandidate = {
+      id: candidate.id,
+      timestamp: candidate.timestamp,
+      actor: candidate.actor,
+      source: candidate.source,
+      records,
+      filteredMessages: [],
+    };
+
+    const recordSource = { getTaskRecords: vi.fn(async () => records) };
+    const summarySelector = {
+      selectSummaries: vi.fn(() => [candidate]),
+    };
+    const strictParser = {
+      parseFiles: vi.fn(async () => new Map([['/tmp/task.jsonl', []]])),
+    };
+    const detailSelector = {
+      selectDetail: vi.fn(() => detailCandidate),
+    };
+    const chunkBuilder = {
+      buildBundleChunks: vi.fn(() => []),
+    };
+
+    const service = new BoardTaskExactLogDetailService(
+      recordSource as never,
+      summarySelector as never,
+      strictParser as never,
+      detailSelector as never,
+      chunkBuilder as never
+    );
+
+    const result = await service.getTaskExactLogDetail(
+      'demo',
+      'task-a',
+      candidate.id,
+      'gen-1'
+    );
+
+    expect(result).toEqual({
+      status: 'ok',
+      detail: {
+        id: candidate.id,
+        chunks: [],
+      },
+    });
+  });
+
+  it('returns missing for non-expandable summaries without parsing transcript content', async () => {
+    const records = [makeRecord()];
+    const nonExpandableCandidate: BoardTaskExactLogBundleCandidate = {
+      ...makeCandidate(records),
+      canLoadDetail: false,
+    };
+    const recordSource = { getTaskRecords: vi.fn(async () => records) };
+    const summarySelector = {
+      selectSummaries: vi.fn(() => [nonExpandableCandidate]),
+    };
+    const strictParser = {
+      parseFiles: vi.fn(async () => new Map()),
+    };
+
+    const service = new BoardTaskExactLogDetailService(
+      recordSource as never,
+      summarySelector as never,
+      strictParser as never,
+      { selectDetail: vi.fn() } as never,
+      { buildBundleChunks: vi.fn() } as never
+    );
+
+    const result = await service.getTaskExactLogDetail('demo', 'task-a', nonExpandableCandidate.id, 'gen-1');
+
+    expect(result).toEqual({ status: 'missing' });
+    expect(strictParser.parseFiles).not.toHaveBeenCalled();
+  });
+
+  it('returns missing when strict detail reconstruction fails for malformed transcript data', async () => {
+    const records = [makeRecord()];
+    const candidate = makeCandidate(records);
+    const strictParser = {
+      parseFiles: vi.fn(async () => new Map([['/tmp/task.jsonl', []]])),
+    };
+    const detailSelector = {
+      selectDetail: vi.fn(() => null),
+    };
+
+    const service = new BoardTaskExactLogDetailService(
+      { getTaskRecords: vi.fn(async () => records) } as never,
+      { selectSummaries: vi.fn(() => [candidate]) } as never,
+      strictParser as never,
+      detailSelector as never,
+      { buildBundleChunks: vi.fn() } as never
+    );
+
+    const result = await service.getTaskExactLogDetail('demo', 'task-a', candidate.id, 'gen-1');
+
+    expect(result).toEqual({ status: 'missing' });
+    expect(strictParser.parseFiles).toHaveBeenCalledWith(['/tmp/task.jsonl']);
+    expect(detailSelector.selectDetail).toHaveBeenCalled();
+  });
+});

test/main/services/team/BoardTaskExactLogStrictParser.test.ts

@@ -0,0 +1,47 @@
+import { afterEach, describe, expect, it } from 'vitest';
+import * as fs from 'fs/promises';
+import * as os from 'os';
+import * as path from 'path';
+
+import { BoardTaskExactLogStrictParser } from '../../../../src/main/services/team/taskLogs/exact/BoardTaskExactLogStrictParser';
+
+const tempDirs: string[] = [];
+
+afterEach(async () => {
+  await Promise.all(
+    tempDirs.splice(0, tempDirs.length).map(async (dirPath) => {
+      await fs.rm(dirPath, { recursive: true, force: true });
+    }),
+  );
+});
+
+describe('BoardTaskExactLogStrictParser', () => {
+  it('drops malformed timestamp rows instead of assigning them synthetic time', async () => {
+    const tempDir = await fs.mkdtemp(path.join(os.tmpdir(), 'exact-log-parser-'));
+    tempDirs.push(tempDir);
+
+    const filePath = path.join(tempDir, 'session.jsonl');
+    await fs.writeFile(
+      filePath,
+      [
+        JSON.stringify({
+          uuid: 'bad-ts',
+          type: 'assistant',
+          timestamp: 'not-a-real-date',
+          message: { role: 'assistant', content: 'bad row' },
+        }),
+        JSON.stringify({
+          uuid: 'good-ts',
+          type: 'assistant',
+          timestamp: '2026-04-12T18:00:00.000Z',
+          message: { role: 'assistant', content: 'good row' },
+        }),
+      ].join('\n'),
+      'utf8',
+    );
+
+    const parsed = await new BoardTaskExactLogStrictParser().parseFiles([filePath]);
+
+    expect(parsed.get(filePath)?.map((message) => message.uuid)).toEqual(['good-ts']);
+  });
+});

test/main/services/team/BoardTaskExactLogSummarySelector.test.ts

@@ -0,0 +1,145 @@
+import { describe, expect, it } from 'vitest';
+
+import { BoardTaskExactLogSummarySelector } from '../../../../src/main/services/team/taskLogs/exact/BoardTaskExactLogSummarySelector';
+
+import type { BoardTaskActivityRecord } from '../../../../src/main/services/team/taskLogs/activity/BoardTaskActivityRecord';
+
+function makeRecord(
+  id: string,
+  overrides: Partial<BoardTaskActivityRecord> = {}
+): BoardTaskActivityRecord {
+  return {
+    id,
+    timestamp: '2026-04-12T16:00:00.000Z',
+    task: {
+      locator: { ref: 'abcd1234', refKind: 'display', canonicalId: 'task-a' },
+      resolution: 'resolved',
+    },
+    linkKind: 'board_action',
+    targetRole: 'subject',
+    actor: {
+      memberName: 'alice',
+      role: 'member',
+      sessionId: 'session-1',
+      agentId: 'agent-1',
+      isSidechain: true,
+    },
+    actorContext: { relation: 'same_task' },
+    action: {
+      canonicalToolName: 'task_add_comment',
+      toolUseId: 'tool-1',
+      category: 'comment',
+    },
+    source: {
+      filePath: '/tmp/task.jsonl',
+      messageUuid: 'msg-1',
+      sourceOrder: 1,
+    },
+    ...overrides,
+  };
+}
+
+describe('BoardTaskExactLogSummarySelector', () => {
+  it('prefers tool anchors over message anchors within one message group', () => {
+    const selector = new BoardTaskExactLogSummarySelector();
+    const records = [
+      makeRecord('r1', { source: { filePath: '/tmp/task.jsonl', messageUuid: 'msg-1', sourceOrder: 1 } }),
+      makeRecord('r2', {
+        source: {
+          filePath: '/tmp/task.jsonl',
+          messageUuid: 'msg-1',
+          toolUseId: 'tool-1',
+          sourceOrder: 2,
+        },
+      }),
+    ];
+
+    const summaries = selector.selectSummaries({
+      records,
+      fileVersionsByPath: new Map([
+        ['/tmp/task.jsonl', { filePath: '/tmp/task.jsonl', mtimeMs: 1000, size: 42 }],
+      ]),
+    });
+
+    expect(summaries).toHaveLength(1);
+    expect(summaries[0]?.id).toBe('tool:/tmp/task.jsonl:tool-1');
+    expect(summaries[0]?.source.toolUseId).toBe('tool-1');
+    expect(summaries[0]?.anchor.kind).toBe('tool');
+    expect(summaries[0]?.actionLabel).toBe('Added a comment');
+    expect(summaries[0]?.actionCategory).toBe('comment');
+    expect(summaries[0]?.canonicalToolName).toBe('task_add_comment');
+    expect(summaries[0]?.records).toHaveLength(2);
+    expect(summaries[0]?.canLoadDetail).toBe(true);
+  });
+
+  it('marks summaries as non-expandable when file version metadata is missing', () => {
+    const selector = new BoardTaskExactLogSummarySelector();
+    const summaries = selector.selectSummaries({
+      records: [makeRecord('r1')],
+      fileVersionsByPath: new Map(),
+    });
+
+    expect(summaries).toHaveLength(1);
+    expect(summaries[0]?.canLoadDetail).toBe(false);
+  });
+
+  it('builds distinct action labels for multiple tool-linked bundles from the same actor', () => {
+    const selector = new BoardTaskExactLogSummarySelector();
+    const records = [
+      makeRecord('r1', {
+        source: {
+          filePath: '/tmp/task.jsonl',
+          messageUuid: 'msg-1',
+          toolUseId: 'tool-comment',
+          sourceOrder: 1,
+        },
+        action: {
+          canonicalToolName: 'task_add_comment',
+          toolUseId: 'tool-comment',
+          category: 'comment',
+        },
+      }),
+      makeRecord('r2', {
+        source: {
+          filePath: '/tmp/task.jsonl',
+          messageUuid: 'msg-2',
+          toolUseId: 'tool-review',
+          sourceOrder: 2,
+        },
+        action: {
+          canonicalToolName: 'review_request',
+          toolUseId: 'tool-review',
+          category: 'review',
+          details: { reviewer: 'tom' },
+        },
+      }),
+      makeRecord('r3', {
+        source: {
+          filePath: '/tmp/task.jsonl',
+          messageUuid: 'msg-3',
+          toolUseId: 'tool-read',
+          sourceOrder: 3,
+        },
+        action: {
+          canonicalToolName: 'task_get',
+          toolUseId: 'tool-read',
+          category: 'read',
+        },
+      }),
+    ];
+
+    const summaries = selector.selectSummaries({
+      records,
+      fileVersionsByPath: new Map([
+        ['/tmp/task.jsonl', { filePath: '/tmp/task.jsonl', mtimeMs: 1000, size: 42 }],
+      ]),
+    });
+
+    expect(summaries).toHaveLength(3);
+    expect(summaries.map((summary) => summary.actionLabel)).toEqual([
+      'Added a comment',
+      'Requested review from tom',
+      'Viewed task',
+    ]);
+  });
+});

test/main/services/team/BoardTaskExactLogsService.test.ts

@@ -0,0 +1,82 @@
+import * as fs from 'fs/promises';
+import * as os from 'os';
+import * as path from 'path';
+
+import { afterEach, describe, expect, it, vi } from 'vitest';
+
+import { BoardTaskExactLogsService } from '../../../../src/main/services/team/taskLogs/exact/BoardTaskExactLogsService';
+
+import type { BoardTaskActivityRecord } from '../../../../src/main/services/team/taskLogs/activity/BoardTaskActivityRecord';
+
+const tempDirs: string[] = [];
+
+async function createTempTranscript(): Promise<string> {
+  const dir = await fs.mkdtemp(path.join(os.tmpdir(), 'exact-log-summary-'));
+  tempDirs.push(dir);
+  const filePath = path.join(dir, 'transcript.jsonl');
+  await fs.writeFile(filePath, '{"uuid":"x","type":"user","timestamp":"2026-04-12T16:00:00.000Z","message":{"role":"user","content":"hi"}}\n', 'utf8');
+  return filePath;
+}
+
+function makeRecord(filePath: string, id: string, timestamp: string, sourceOrder: number): BoardTaskActivityRecord {
+  return {
+    id,
+    timestamp,
+    task: {
+      locator: { ref: 'abcd1234', refKind: 'display', canonicalId: 'task-a' },
+      resolution: 'resolved',
+    },
+    linkKind: 'board_action',
+    targetRole: 'subject',
+    actor: {
+      memberName: 'alice',
+      role: 'member',
+      sessionId: 'session-1',
+      agentId: 'agent-1',
+      isSidechain: true,
+    },
+    actorContext: { relation: 'same_task' },
+    source: {
+      filePath,
+      messageUuid: id,
+      sourceOrder,
+    },
+  };
+}
+
+afterEach(async () => {
+  await Promise.all(tempDirs.splice(0).map((dir) => fs.rm(dir, { recursive: true, force: true })));
+  vi.unstubAllEnvs();
+});
+
+describe('BoardTaskExactLogsService', () => {
+  it('returns empty when the exact-log read flag is disabled', async () => {
+    vi.stubEnv('CLAUDE_TEAM_BOARD_TASK_EXACT_LOGS_READ_ENABLED', 'false');
+    const recordSource = {
+      getTaskRecords: vi.fn(async () => {
+        throw new Error('should not be called');
+      }),
+    };
+
+    const service = new BoardTaskExactLogsService(recordSource as never);
+    await expect(service.getTaskExactLogSummaries('demo', 'task-a')).resolves.toEqual({ items: [] });
+    expect(recordSource.getTaskRecords).not.toHaveBeenCalled();
+  });
+
+  it('returns summaries in deterministic source order for the renderer to present', async () => {
+    const filePath = await createTempTranscript();
+    const recordSource = {
+      getTaskRecords: vi.fn(async () => [
+        makeRecord(filePath, 'msg-older', '2026-04-12T16:00:00.000Z', 1),
+        makeRecord(filePath, 'msg-newer', '2026-04-12T16:05:00.000Z', 2),
+      ]),
+    };
+
+    const service = new BoardTaskExactLogsService(recordSource as never);
+    const response = await service.getTaskExactLogSummaries('demo', 'task-a');
+
+    expect(response.items).toHaveLength(2);
+    expect(response.items[0]?.timestamp).toBe('2026-04-12T16:00:00.000Z');
+    expect(response.items[1]?.timestamp).toBe('2026-04-12T16:05:00.000Z');
+  });
+});

test/main/services/team/BoardTaskLogDiagnosticsService.test.ts

@@ -0,0 +1,311 @@
+import { mkdtemp, rm, writeFile } from 'fs/promises';
+import { tmpdir } from 'os';
+import path from 'path';
+
+import { afterEach, describe, expect, it } from 'vitest';
+
+import { BoardTaskActivityRecordBuilder } from '../../../../src/main/services/team/taskLogs/activity/BoardTaskActivityRecordBuilder';
+import { BoardTaskActivityRecordSource } from '../../../../src/main/services/team/taskLogs/activity/BoardTaskActivityRecordSource';
+import { BoardTaskActivityTranscriptReader } from '../../../../src/main/services/team/taskLogs/activity/BoardTaskActivityTranscriptReader';
+import { BoardTaskLogDiagnosticsService } from '../../../../src/main/services/team/taskLogs/diagnostics/BoardTaskLogDiagnosticsService';
+import { BoardTaskLogStreamService } from '../../../../src/main/services/team/taskLogs/stream/BoardTaskLogStreamService';
+
+import type { TeamTask } from '../../../../src/shared/types';
+
+const TEAM_NAME = 'beacon-desk-2';
+const TASK_ID = 'c414cd52-470a-4b51-ae1e-e5250fff95d7';
+
+function createTask(overrides: Partial<TeamTask> = {}): TeamTask {
+  return {
+    id: TASK_ID,
+    displayId: 'c414cd52',
+    subject: 'Help alice: fast lint/link check',
+    status: 'completed',
+    workIntervals: [
+      {
+        startedAt: '2026-04-12T15:36:00.000Z',
+        completedAt: '2026-04-12T15:40:00.000Z',
+      },
+    ],
+    ...overrides,
+  };
+}
+
+function createAssistantEntry(args: {
+  uuid: string;
+  timestamp: string;
+  content: unknown[];
+  agentName?: string;
+  sessionId?: string;
+  requestId?: string;
+}): Record<string, unknown> {
+  return {
+    type: 'assistant',
+    uuid: args.uuid,
+    timestamp: args.timestamp,
+    sessionId: args.sessionId ?? 'session-tom',
+    teamName: TEAM_NAME,
+    agentName: args.agentName ?? 'tom',
+    isSidechain: false,
+    requestId: args.requestId,
+    message: {
+      id: `${args.uuid}-msg`,
+      role: 'assistant',
+      model: 'claude-test',
+      type: 'message',
+      stop_reason: 'tool_use',
+      stop_sequence: null,
+      usage: {
+        input_tokens: 0,
+        output_tokens: 0,
+      },
+      content: args.content,
+    },
+  };
+}
+
+function createUserEntry(args: {
+  uuid: string;
+  timestamp: string;
+  content: unknown[];
+  boardTaskLinks?: unknown[];
+  boardTaskToolActions?: unknown[];
+  toolUseResult?: Record<string, unknown>;
+  sourceToolAssistantUUID?: string;
+  agentName?: string;
+  sessionId?: string;
+}): Record<string, unknown> {
+  return {
+    type: 'user',
+    uuid: args.uuid,
+    timestamp: args.timestamp,
+    sessionId: args.sessionId ?? 'session-tom',
+    teamName: TEAM_NAME,
+    agentName: args.agentName ?? 'tom',
+    isSidechain: false,
+    ...(args.boardTaskLinks ? { boardTaskLinks: args.boardTaskLinks } : {}),
+    ...(args.boardTaskToolActions ? { boardTaskToolActions: args.boardTaskToolActions } : {}),
+    ...(args.toolUseResult ? { toolUseResult: args.toolUseResult } : {}),
+    ...(args.sourceToolAssistantUUID
+      ? { sourceToolAssistantUUID: args.sourceToolAssistantUUID }
+      : {}),
+    message: {
+      role: 'user',
+      content: args.content,
+    },
+  };
+}
+
+describe('BoardTaskLogDiagnosticsService', () => {
+  const tempDirs: string[] = [];
+
+  afterEach(async () => {
+    await Promise.all(
+      tempDirs.splice(0).map((dir) => rm(dir, { recursive: true, force: true })),
+    );
+  });
+
+  it('explains when worker tools exist in transcript but only board MCP actions are explicit', async () => {
+    const dir = await mkdtemp(path.join(tmpdir(), 'task-log-diagnostics-'));
+    tempDirs.push(dir);
+    const transcriptPath = path.join(dir, 'session.jsonl');
+    const task = createTask();
+
+    const lines = [
+      createAssistantEntry({
+        uuid: 'a-task-start',
+        timestamp: '2026-04-12T15:36:00.000Z',
+        requestId: 'req-start',
+        content: [
+          {
+            type: 'tool_use',
+            id: 'call-task-start',
+            name: 'mcp__agent-teams__task_start',
+            input: {
+              teamName: TEAM_NAME,
+              taskId: TASK_ID,
+            },
+          },
+        ],
+      }),
+      createUserEntry({
+        uuid: 'u-task-start',
+        timestamp: '2026-04-12T15:36:00.100Z',
+        sourceToolAssistantUUID: 'a-task-start',
+        content: [
+          {
+            type: 'tool_result',
+            tool_use_id: 'call-task-start',
+            content: 'ok',
+          },
+        ],
+        boardTaskLinks: [
+          {
+            schemaVersion: 1,
+            toolUseId: 'call-task-start',
+            task: {
+              ref: TASK_ID,
+              refKind: 'canonical',
+              canonicalId: TASK_ID,
+            },
+            targetRole: 'subject',
+            linkKind: 'lifecycle',
+            taskArgumentSlot: 'taskId',
+            actorContext: {
+              relation: 'idle',
+            },
+          },
+        ],
+        boardTaskToolActions: [
+          {
+            schemaVersion: 1,
+            toolUseId: 'call-task-start',
+            canonicalToolName: 'task_start',
+          },
+        ],
+        toolUseResult: {
+          toolUseId: 'call-task-start',
+          content: '{"id":"c414cd52"}',
+        },
+      }),
+      createAssistantEntry({
+        uuid: 'a-grep',
+        timestamp: '2026-04-12T15:36:14.522Z',
+        requestId: 'req-grep',
+        content: [
+          {
+            type: 'tool_use',
+            id: 'call-grep',
+            name: 'Grep',
+            input: {
+              pattern: 'ITERATION_PLAN',
+              path: 'docs-site',
+            },
+          },
+        ],
+      }),
+      createUserEntry({
+        uuid: 'u-grep',
+        timestamp: '2026-04-12T15:36:14.749Z',
+        sourceToolAssistantUUID: 'a-grep',
+        content: [
+          {
+            type: 'tool_result',
+            tool_use_id: 'call-grep',
+            content: 'docs-site/guide.md:42: ITERATION_PLAN',
+          },
+        ],
+        toolUseResult: {
+          toolUseId: 'call-grep',
+          content: 'docs-site/guide.md:42: ITERATION_PLAN',
+        },
+      }),
+      createAssistantEntry({
+        uuid: 'a-comment',
+        timestamp: '2026-04-12T15:36:30.000Z',
+        requestId: 'req-comment',
+        content: [
+          {
+            type: 'tool_use',
+            id: 'call-comment',
+            name: 'mcp__agent-teams__task_add_comment',
+            input: {
+              teamName: TEAM_NAME,
+              taskId: TASK_ID,
+              text: 'Audit complete',
+            },
+          },
+        ],
+      }),
+      createUserEntry({
+        uuid: 'u-comment',
+        timestamp: '2026-04-12T15:36:30.100Z',
+        sourceToolAssistantUUID: 'a-comment',
+        content: [
+          {
+            type: 'tool_result',
+            tool_use_id: 'call-comment',
+            content: '{"comment":{"text":"Audit complete"}}',
+          },
+        ],
+        boardTaskLinks: [
+          {
+            schemaVersion: 1,
+            toolUseId: 'call-comment',
+            task: {
+              ref: TASK_ID,
+              refKind: 'canonical',
+              canonicalId: TASK_ID,
+            },
+            targetRole: 'subject',
+            linkKind: 'board_action',
+            taskArgumentSlot: 'taskId',
+            actorContext: {
+              relation: 'same_task',
+            },
+          },
+        ],
+        boardTaskToolActions: [
+          {
+            schemaVersion: 1,
+            toolUseId: 'call-comment',
+            canonicalToolName: 'task_add_comment',
+            resultRefs: {
+              commentId: 'comment-1',
+            },
+          },
+        ],
+        toolUseResult: {
+          toolUseId: 'call-comment',
+          content: '{"comment":{"text":"Audit complete"}}',
+        },
+      }),
+    ];
+
+    await writeFile(
+      transcriptPath,
+      lines.map((line) => JSON.stringify(line)).join('\n'),
+      'utf8',
+    );
+
+    const taskReader = {
+      getTasks: async () => [task],
+      getDeletedTasks: async () => [] as TeamTask[],
+    };
+    const transcriptSourceLocator = {
+      listTranscriptFiles: async () => [transcriptPath],
+    };
+    const recordSource = new BoardTaskActivityRecordSource(
+      transcriptSourceLocator as never,
+      taskReader as never,
+      new BoardTaskActivityTranscriptReader(),
+      new BoardTaskActivityRecordBuilder(),
+    );
+    const streamService = new BoardTaskLogStreamService(recordSource);
+    const diagnosticsService = new BoardTaskLogDiagnosticsService(
+      taskReader as never,
+      transcriptSourceLocator as never,
+      recordSource,
+      undefined,
+      streamService,
+    );
+
+    const report = await diagnosticsService.diagnose(TEAM_NAME, '#c414cd52');
+
+    expect(report.explicitRecords.execution).toBe(0);
+    expect(report.intervalToolResults.worker.total).toBe(1);
+    expect(report.intervalToolResults.worker.explicitLinked).toBe(0);
+    expect(report.intervalToolResults.worker.missingExplicit).toBe(1);
+    expect(report.intervalToolResults.worker.examples).toContainEqual(
+      expect.objectContaining({
+        toolName: 'Grep',
+        toolUseId: 'call-grep',
+      }),
+    );
+    expect(report.stream.visibleToolNames).toEqual([
+      'mcp__agent-teams__task_start',
+      'mcp__agent-teams__task_add_comment',
+    ]);
+    expect(report.diagnosis.join(' ')).toContain('Only board MCP actions are explicit');
+  });
+});

test/main/services/team/BoardTaskLogStream.live.test.ts

@@ -0,0 +1,72 @@
+import * as os from 'os';
+import * as path from 'path';
+
+import { afterAll, beforeAll, describe, expect, it } from 'vitest';
+
+import { BoardTaskLogStreamService } from '../../../../src/main/services/team/taskLogs/stream/BoardTaskLogStreamService';
+import { BoardTaskLogDiagnosticsService } from '../../../../src/main/services/team/taskLogs/diagnostics/BoardTaskLogDiagnosticsService';
+import { setClaudeBasePathOverride } from '../../../../src/main/utils/pathDecoder';
+
+const LIVE_TEAM = process.env.LIVE_TASK_LOG_TEAM?.trim();
+const LIVE_TASK = process.env.LIVE_TASK_LOG_TASK?.trim();
+const LIVE_CLAUDE_BASE =
+  process.env.LIVE_TASK_LOG_CLAUDE_BASE?.trim() || path.join(os.homedir(), '.claude');
+const EXPECT_MISSING_WORKER_LINKS =
+  process.env.LIVE_TASK_LOG_EXPECT_MISSING_WORKER_LINKS === '1';
+const EXPECT_NO_EMPTY_PAYLOADS =
+  process.env.LIVE_TASK_LOG_EXPECT_NO_EMPTY_PAYLOADS === '1';
+const EXPECT_VISIBLE_TOOLS = (process.env.LIVE_TASK_LOG_EXPECT_VISIBLE_TOOLS ?? '')
+  .split(',')
+  .map((value) => value.trim())
+  .filter(Boolean);
+
+const describeLive =
+  LIVE_TEAM && LIVE_TASK && LIVE_CLAUDE_BASE ? describe : describe.skip;
+
+describeLive('BoardTaskLogStream live smoke', () => {
+  beforeAll(() => {
+    setClaudeBasePathOverride(LIVE_CLAUDE_BASE);
+  });
+
+  afterAll(() => {
+    setClaudeBasePathOverride(null);
+  });
+
+  it('diagnoses the current live task-log state', async () => {
+    const service = new BoardTaskLogDiagnosticsService();
+    const streamService = new BoardTaskLogStreamService();
+    let report;
+    try {
+      report = await service.diagnose(LIVE_TEAM!, LIVE_TASK!);
+    } catch (error) {
+      const fallbackTaskRef =
+        LIVE_TASK!.length > 8 && LIVE_TASK!.includes('-') ? LIVE_TASK!.slice(0, 8) : null;
+      if (!fallbackTaskRef) {
+        throw error;
+      }
+      report = await service.diagnose(LIVE_TEAM!, fallbackTaskRef);
+    }
+
+    expect(report.task.taskId).toBeTruthy();
+    expect(report.transcript.fileCount).toBeGreaterThan(0);
+    expect(report.diagnosis.length).toBeGreaterThan(0);
+    expect(report.stream.segmentCount).toBeGreaterThan(0);
+
+    const stream = await streamService.getTaskLogStream(LIVE_TEAM!, report.task.taskId);
+    expect(stream.segments.length).toBeGreaterThan(0);
+
+    if (EXPECT_MISSING_WORKER_LINKS) {
+      expect(report.intervalToolResults.worker.missingExplicit).toBeGreaterThan(0);
+    }
+
+    if (EXPECT_NO_EMPTY_PAYLOADS) {
+      expect(report.stream.emptyPayloadExamples).toHaveLength(0);
+    }
+
+    if (EXPECT_VISIBLE_TOOLS.length > 0) {
+      for (const toolName of EXPECT_VISIBLE_TOOLS) {
+        expect(report.stream.visibleToolNames).toContain(toolName);
+      }
+    }
+  });
+});

test/main/services/team/BoardTaskLogStreamIntegration.test.ts

@@ -0,0 +1,380 @@
+import { mkdtemp, rm, writeFile } from 'fs/promises';
+import { tmpdir } from 'os';
+import path from 'path';
+
+import { afterEach, describe, expect, it } from 'vitest';
+
+import { BoardTaskLogStreamService } from '../../../../src/main/services/team/taskLogs/stream/BoardTaskLogStreamService';
+import { BoardTaskActivityRecordBuilder } from '../../../../src/main/services/team/taskLogs/activity/BoardTaskActivityRecordBuilder';
+import { BoardTaskActivityTranscriptReader } from '../../../../src/main/services/team/taskLogs/activity/BoardTaskActivityTranscriptReader';
+
+import type { ParsedMessage } from '../../../../src/main/types';
+import type { TeamTask } from '../../../../src/shared/types';
+
+const TEAM_NAME = 'beacon-desk-2';
+const TASK_ID = 'c414cd52-470a-4b51-ae1e-e5250fff95d7';
+
+function createTask(overrides: Partial<TeamTask> = {}): TeamTask {
+  return {
+    id: TASK_ID,
+    displayId: 'c414cd52',
+    subject: 'Help alice: fast lint/link check',
+    status: 'completed',
+    ...overrides,
+  };
+}
+
+function createAssistantEntry(args: {
+  uuid: string;
+  timestamp: string;
+  content: unknown[];
+  agentName?: string;
+  sessionId?: string;
+  requestId?: string;
+}): Record<string, unknown> {
+  return {
+    type: 'assistant',
+    uuid: args.uuid,
+    timestamp: args.timestamp,
+    sessionId: args.sessionId ?? 'session-tom',
+    teamName: TEAM_NAME,
+    agentName: args.agentName ?? 'tom',
+    isSidechain: false,
+    requestId: args.requestId,
+    message: {
+      id: `${args.uuid}-msg`,
+      role: 'assistant',
+      model: 'claude-test',
+      type: 'message',
+      stop_reason: 'tool_use',
+      stop_sequence: null,
+      usage: {
+        input_tokens: 0,
+        output_tokens: 0,
+      },
+      content: args.content,
+    },
+  };
+}
+
+function createUserEntry(args: {
+  uuid: string;
+  timestamp: string;
+  content: unknown[];
+  boardTaskLinks?: unknown[];
+  boardTaskToolActions?: unknown[];
+  toolUseResult?: unknown;
+  sourceToolAssistantUUID?: string;
+  agentName?: string;
+  sessionId?: string;
+}): Record<string, unknown> {
+  return {
+    type: 'user',
+    uuid: args.uuid,
+    timestamp: args.timestamp,
+    sessionId: args.sessionId ?? 'session-tom',
+    teamName: TEAM_NAME,
+    agentName: args.agentName ?? 'tom',
+    isSidechain: false,
+    ...(args.boardTaskLinks ? { boardTaskLinks: args.boardTaskLinks } : {}),
+    ...(args.boardTaskToolActions ? { boardTaskToolActions: args.boardTaskToolActions } : {}),
+    ...(args.toolUseResult ? { toolUseResult: args.toolUseResult } : {}),
+    ...(args.sourceToolAssistantUUID
+      ? { sourceToolAssistantUUID: args.sourceToolAssistantUUID }
+      : {}),
+    message: {
+      role: 'user',
+      content: args.content,
+    },
+  };
+}
+
+async function buildRecordsFromTranscript(filePath: string, task: TeamTask) {
+  const transcriptReader = new BoardTaskActivityTranscriptReader();
+  const recordBuilder = new BoardTaskActivityRecordBuilder();
+  const messages = await transcriptReader.readFiles([filePath]);
+
+  return recordBuilder.buildForTask({
+    teamName: TEAM_NAME,
+    targetTask: task,
+    tasks: [task],
+    messages,
+  });
+}
+
+function flattenRawMessages(response: Awaited<ReturnType<BoardTaskLogStreamService['getTaskLogStream']>>): ParsedMessage[] {
+  return response.segments.flatMap((segment) =>
+    segment.chunks.flatMap((chunk) => chunk.rawMessages),
+  );
+}
+
+describe('BoardTaskLogStreamService integration', () => {
+  const tempDirs: string[] = [];
+
+  afterEach(async () => {
+    await Promise.all(
+      tempDirs.splice(0).map((dir) => rm(dir, { recursive: true, force: true })),
+    );
+  });
+
+  it('includes worker tool logs when transcript rows carry execution links with toolUseId', async () => {
+    const dir = await mkdtemp(path.join(tmpdir(), 'task-log-stream-integration-'));
+    tempDirs.push(dir);
+    const transcriptPath = path.join(dir, 'session.jsonl');
+    const task = createTask();
+
+    const lines = [
+      createUserEntry({
+        uuid: 'u-start',
+        timestamp: '2026-04-12T15:36:07.747Z',
+        content: [
+          {
+            type: 'tool_result',
+            tool_use_id: 'call-task-start',
+            content: 'ok',
+          },
+        ],
+        boardTaskLinks: [
+          {
+            schemaVersion: 1,
+            toolUseId: 'call-task-start',
+            task: {
+              ref: TASK_ID,
+              refKind: 'canonical',
+              canonicalId: TASK_ID,
+            },
+            targetRole: 'subject',
+            linkKind: 'lifecycle',
+            taskArgumentSlot: 'taskId',
+            actorContext: {
+              relation: 'idle',
+            },
+          },
+        ],
+        boardTaskToolActions: [
+          {
+            schemaVersion: 1,
+            toolUseId: 'call-task-start',
+            canonicalToolName: 'task_start',
+          },
+        ],
+        toolUseResult: {
+          toolUseId: 'call-task-start',
+          content: '{"id":"c414cd52"}',
+        },
+      }),
+      createAssistantEntry({
+        uuid: 'a-grep',
+        timestamp: '2026-04-12T15:36:14.522Z',
+        requestId: 'req-grep',
+        content: [
+          {
+            type: 'tool_use',
+            id: 'call-grep',
+            name: 'Grep',
+            input: {
+              pattern: 'ITERATION_PLAN',
+              path: 'docs-site',
+            },
+          },
+        ],
+      }),
+      createUserEntry({
+        uuid: 'u-grep',
+        timestamp: '2026-04-12T15:36:14.749Z',
+        sourceToolAssistantUUID: 'a-grep',
+        content: [
+          {
+            type: 'tool_result',
+            tool_use_id: 'call-grep',
+            content: 'docs-site/guide.md:42: ITERATION_PLAN',
+          },
+        ],
+        boardTaskLinks: [
+          {
+            schemaVersion: 1,
+            toolUseId: 'call-grep',
+            task: {
+              ref: TASK_ID,
+              refKind: 'canonical',
+              canonicalId: TASK_ID,
+            },
+            targetRole: 'subject',
+            linkKind: 'execution',
+            actorContext: {
+              relation: 'same_task',
+            },
+          },
+        ],
+        toolUseResult: {
+          toolUseId: 'call-grep',
+          content: 'docs-site/guide.md:42: ITERATION_PLAN',
+        },
+      }),
+      createAssistantEntry({
+        uuid: 'a-edit',
+        timestamp: '2026-04-12T15:36:40.000Z',
+        requestId: 'req-edit',
+        content: [
+          {
+            type: 'tool_use',
+            id: 'call-edit',
+            name: 'Edit',
+            input: {
+              file_path: 'docs-site/guide.md',
+            },
+          },
+        ],
+      }),
+      createUserEntry({
+        uuid: 'u-edit',
+        timestamp: '2026-04-12T15:36:40.200Z',
+        sourceToolAssistantUUID: 'a-edit',
+        content: [
+          {
+            type: 'tool_result',
+            tool_use_id: 'call-edit',
+            content: 'File updated',
+          },
+        ],
+        boardTaskLinks: [
+          {
+            schemaVersion: 1,
+            toolUseId: 'call-edit',
+            task: {
+              ref: TASK_ID,
+              refKind: 'canonical',
+              canonicalId: TASK_ID,
+            },
+            targetRole: 'subject',
+            linkKind: 'execution',
+            actorContext: {
+              relation: 'same_task',
+            },
+          },
+        ],
+        toolUseResult: {
+          toolUseId: 'call-edit',
+          content: 'File updated',
+        },
+      }),
+    ];
+
+    await writeFile(
+      transcriptPath,
+      `${lines.map((line) => JSON.stringify(line)).join('\n')}\n`,
+      'utf8',
+    );
+
+    const recordSource = {
+      getTaskRecords: async () => buildRecordsFromTranscript(transcriptPath, task),
+    };
+
+    const service = new BoardTaskLogStreamService(recordSource as never);
+    const response = await service.getTaskLogStream(TEAM_NAME, task.id);
+    const rawMessages = flattenRawMessages(response);
+    const toolNames = rawMessages.flatMap((message) =>
+      message.toolCalls.map((toolCall) => toolCall.name),
+    );
+
+    expect(response.participants.map((participant) => participant.label)).toEqual(['tom']);
+    expect(response.defaultFilter).toBe('member:tom');
+    expect(response.segments).toHaveLength(1);
+    expect(toolNames).toContain('Grep');
+    expect(toolNames).toContain('Edit');
+  });
+
+  it('does not leak empty array board-tool payloads into the task log stream', async () => {
+    const dir = await mkdtemp(path.join(tmpdir(), 'task-log-stream-board-tool-'));
+    tempDirs.push(dir);
+    const transcriptPath = path.join(dir, 'session.jsonl');
+    const task = createTask();
+
+    const lines = [
+      createAssistantEntry({
+        uuid: 'a-comment',
+        timestamp: '2026-04-12T18:35:02.000Z',
+        requestId: 'req-comment',
+        content: [
+          {
+            type: 'tool_use',
+            id: 'call-comment',
+            name: 'mcp__agent-teams__task_add_comment',
+            input: {
+              taskId: TASK_ID,
+              text: 'Done',
+            },
+          },
+        ],
+      }),
+      createUserEntry({
+        uuid: 'u-comment',
+        timestamp: '2026-04-12T18:35:02.064Z',
+        sourceToolAssistantUUID: 'a-comment',
+        content: [
+          {
+            type: 'tool_result',
+            tool_use_id: 'call-comment',
+            content: [
+              {
+                type: 'text',
+                text: '{\n  "commentId": "comment-1",\n  "task": {\n    "id": "c414cd52-470a-4b51-ae1e-e5250fff95d7"\n  }\n}',
+              },
+            ],
+          },
+        ],
+        boardTaskLinks: [
+          {
+            schemaVersion: 1,
+            toolUseId: 'call-comment',
+            task: {
+              ref: TASK_ID,
+              refKind: 'canonical',
+              canonicalId: TASK_ID,
+            },
+            targetRole: 'subject',
+            linkKind: 'board_action',
+            taskArgumentSlot: 'taskId',
+            actorContext: {
+              relation: 'same_task',
+            },
+          },
+        ],
+        boardTaskToolActions: [
+          {
+            schemaVersion: 1,
+            toolUseId: 'call-comment',
+            canonicalToolName: 'task_add_comment',
+            resultRefs: {
+              commentId: 'comment-1',
+            },
+          },
+        ],
+        toolUseResult: [
+          {
+            type: 'text',
+            text: '{\n  "commentId": "comment-1",\n  "task": {\n    "id": "c414cd52-470a-4b51-ae1e-e5250fff95d7"\n  }\n}',
+          },
+        ],
+      }),
+    ];
+
+    await writeFile(
+      transcriptPath,
+      `${lines.map((line) => JSON.stringify(line)).join('\n')}\n`,
+      'utf8',
+    );
+
+    const recordSource = {
+      getTaskRecords: async () => buildRecordsFromTranscript(transcriptPath, task),
+    };
+
+    const service = new BoardTaskLogStreamService(recordSource as never);
+    const response = await service.getTaskLogStream(TEAM_NAME, task.id);
+    const rawMessages = flattenRawMessages(response);
+    const commentResult = rawMessages.find((message) => message.uuid === 'u-comment');
+
+    expect(response.segments).toHaveLength(1);
+    expect(commentResult).toBeUndefined();
+  });
+});

test/main/services/team/BoardTaskLogStreamService.test.ts

@@ -0,0 +1,639 @@
+import { afterEach, describe, expect, it, vi } from 'vitest';
+
+import { BoardTaskLogStreamService } from '../../../../src/main/services/team/taskLogs/stream/BoardTaskLogStreamService';
+
+import type { ParsedMessage } from '../../../../src/main/types';
+import type { BoardTaskActivityRecord } from '../../../../src/main/services/team/taskLogs/activity/BoardTaskActivityRecord';
+import type { BoardTaskExactLogBundleCandidate } from '../../../../src/main/services/team/taskLogs/exact/BoardTaskExactLogTypes';
+
+function makeRecord(
+  id: string,
+  timestamp: string,
+  actor: BoardTaskActivityRecord['actor'],
+  toolUseId?: string,
+): BoardTaskActivityRecord {
+  return {
+    id,
+    timestamp,
+    task: {
+      locator: { ref: 'abcd1234', refKind: 'display', canonicalId: 'task-a' },
+      resolution: 'resolved',
+    },
+    linkKind: 'board_action',
+    targetRole: 'subject',
+    actor,
+    actorContext: { relation: 'same_task' },
+    source: {
+      filePath: '/tmp/task.jsonl',
+      messageUuid: `${id}-msg`,
+      ...(toolUseId ? { toolUseId } : {}),
+      sourceOrder: 1,
+    },
+  };
+}
+
+function makeCandidate(
+  id: string,
+  timestamp: string,
+  actor: BoardTaskActivityRecord['actor'],
+  toolUseId?: string,
+): BoardTaskExactLogBundleCandidate {
+  const record = makeRecord(id, timestamp, actor, toolUseId);
+  return {
+    id,
+    timestamp,
+    actor,
+    source: {
+      filePath: '/tmp/task.jsonl',
+      messageUuid: `${id}-msg`,
+      ...(toolUseId ? { toolUseId } : {}),
+      sourceOrder: 1,
+    },
+    records: [record],
+    anchor: toolUseId
+      ? {
+          kind: 'tool',
+          filePath: '/tmp/task.jsonl',
+          messageUuid: `${id}-msg`,
+          toolUseId,
+        }
+      : {
+          kind: 'message',
+          filePath: '/tmp/task.jsonl',
+          messageUuid: `${id}-msg`,
+        },
+    actionLabel: 'Worked on task',
+    linkKinds: ['board_action'],
+    targetRoles: ['subject'],
+    canLoadDetail: true,
+    sourceGeneration: 'gen-1',
+  };
+}
+
+function makeMessage(uuid: string, timestamp: string, text: string): ParsedMessage {
+  return {
+    uuid,
+    parentUuid: null,
+    type: 'assistant',
+    timestamp: new Date(timestamp),
+    role: 'assistant',
+    content: [{ type: 'text', text } as never],
+    toolCalls: [],
+    toolResults: [],
+    isSidechain: true,
+    isMeta: false,
+    isCompactSummary: false,
+  };
+}
+
+describe('BoardTaskLogStreamService', () => {
+  afterEach(() => {
+    vi.unstubAllEnvs();
+  });
+
+  it('returns empty when the stream read flag is disabled', async () => {
+    vi.stubEnv('CLAUDE_TEAM_BOARD_TASK_EXACT_LOGS_READ_ENABLED', 'false');
+    const recordSource = {
+      getTaskRecords: vi.fn(async () => {
+        throw new Error('should not be called');
+      }),
+    };
+
+    const service = new BoardTaskLogStreamService(recordSource as never);
+    await expect(service.getTaskLogStream('demo', 'task-a')).resolves.toEqual({
+      participants: [],
+      defaultFilter: 'all',
+      segments: [],
+    });
+    expect(recordSource.getTaskRecords).not.toHaveBeenCalled();
+  });
+
+  it('groups contiguous slices into participant segments and excludes lead slices when member slices exist', async () => {
+    const tom = {
+      memberName: 'tom',
+      role: 'member' as const,
+      sessionId: 'session-tom',
+      agentId: 'agent-tom',
+      isSidechain: true,
+    };
+    const alice = {
+      memberName: 'alice',
+      role: 'member' as const,
+      sessionId: 'session-alice',
+      agentId: 'agent-alice',
+      isSidechain: true,
+    };
+    const lead = {
+      role: 'lead' as const,
+      sessionId: 'session-lead',
+      isSidechain: false,
+    };
+    const candidates = [
+      makeCandidate('c1', '2026-04-12T16:00:00.000Z', tom, 'tool-1'),
+      makeCandidate('c2', '2026-04-12T16:01:00.000Z', tom, 'tool-2'),
+      makeCandidate('c3', '2026-04-12T16:02:00.000Z', alice, 'tool-3'),
+      makeCandidate('c4', '2026-04-12T16:03:00.000Z', lead),
+      makeCandidate('c5', '2026-04-12T16:04:00.000Z', tom, 'tool-4'),
+    ];
+
+    const recordSource = {
+      getTaskRecords: vi.fn(async () => candidates.flatMap((candidate) => candidate.records)),
+    };
+    const summarySelector = {
+      selectSummaries: vi.fn(() => candidates),
+    };
+    const strictParser = {
+      parseFiles: vi.fn(async () => new Map([['/tmp/task.jsonl', []]])),
+    };
+    const detailSelector = {
+      selectDetail: vi.fn(({ candidate }: { candidate: BoardTaskExactLogBundleCandidate }) => ({
+        id: candidate.id,
+        timestamp: candidate.timestamp,
+        actor: candidate.actor,
+        source: candidate.source,
+        records: candidate.records,
+        filteredMessages: [makeMessage(candidate.id, candidate.timestamp, candidate.id)],
+      })),
+    };
+    const buildBundleChunks = vi.fn((messages: ParsedMessage[]) => [{ id: messages[0]?.uuid }]);
+
+    const service = new BoardTaskLogStreamService(
+      recordSource as never,
+      summarySelector as never,
+      strictParser as never,
+      detailSelector as never,
+      { buildBundleChunks } as never,
+    );
+
+    const response = await service.getTaskLogStream('demo', 'task-a');
+
+    expect(response.defaultFilter).toBe('all');
+    expect(response.participants.map((participant) => participant.key)).toEqual([
+      'member:tom',
+      'member:alice',
+    ]);
+    expect(response.segments.map((segment) => segment.participantKey)).toEqual([
+      'member:tom',
+      'member:alice',
+      'member:tom',
+    ]);
+    expect(buildBundleChunks).toHaveBeenCalledTimes(3);
+    expect(buildBundleChunks.mock.calls[0]?.[0]).toHaveLength(2);
+  });
+
+  it('merges duplicate message uuids inside one participant segment before chunk building', async () => {
+    const tom = {
+      memberName: 'tom',
+      role: 'member' as const,
+      sessionId: 'session-tom',
+      agentId: 'agent-tom',
+      isSidechain: true,
+    };
+    const candidates = [
+      makeCandidate('c1', '2026-04-12T16:00:00.000Z', tom, 'tool-1'),
+      makeCandidate('c2', '2026-04-12T16:00:10.000Z', tom, 'tool-2'),
+    ];
+
+    const sharedMessage = {
+      uuid: 'assistant-shared',
+      parentUuid: null,
+      type: 'assistant' as const,
+      timestamp: new Date('2026-04-12T16:00:00.000Z'),
+      role: 'assistant',
+      toolCalls: [],
+      toolResults: [],
+      isSidechain: true,
+      isMeta: false,
+      isCompactSummary: false,
+    };
+
+    const recordSource = {
+      getTaskRecords: vi.fn(async () => candidates.flatMap((candidate) => candidate.records)),
+    };
+    const summarySelector = {
+      selectSummaries: vi.fn(() => candidates),
+    };
+    const strictParser = {
+      parseFiles: vi.fn(async () => new Map([['/tmp/task.jsonl', []]])),
+    };
+    const detailSelector = {
+      selectDetail: vi
+        .fn()
+        .mockImplementationOnce(() => ({
+          id: 'c1',
+          timestamp: '2026-04-12T16:00:00.000Z',
+          actor: tom,
+          source: { filePath: '/tmp/task.jsonl', messageUuid: 'assistant-shared', sourceOrder: 1 },
+          records: candidates[0]!.records,
+          filteredMessages: [
+            {
+              ...sharedMessage,
+              content: [{ type: 'tool_use', id: 'tool-1', name: 'task_get', input: {} } as never],
+            },
+          ],
+        }))
+        .mockImplementationOnce(() => ({
+          id: 'c2',
+          timestamp: '2026-04-12T16:00:10.000Z',
+          actor: tom,
+          source: { filePath: '/tmp/task.jsonl', messageUuid: 'assistant-shared', sourceOrder: 2 },
+          records: candidates[1]!.records,
+          filteredMessages: [
+            {
+              ...sharedMessage,
+              content: [{ type: 'text', text: 'task looked up' } as never],
+            },
+          ],
+        })),
+    };
+    const buildBundleChunks = vi.fn((messages: ParsedMessage[]) => [{ id: messages[0]?.uuid }]);
+
+    const service = new BoardTaskLogStreamService(
+      recordSource as never,
+      summarySelector as never,
+      strictParser as never,
+      detailSelector as never,
+      { buildBundleChunks } as never,
+    );
+
+    await service.getTaskLogStream('demo', 'task-a');
+
+    expect(buildBundleChunks).toHaveBeenCalledTimes(1);
+    const mergedMessages = buildBundleChunks.mock.calls[0]?.[0] as ParsedMessage[];
+    expect(mergedMessages).toHaveLength(1);
+    expect(mergedMessages[0]?.toolCalls).toHaveLength(1);
+    expect(Array.isArray(mergedMessages[0]?.content)).toBe(true);
+    expect(mergedMessages[0]?.content).toHaveLength(2);
+  });
+
+  it('drops tool-anchored assistant output-only messages to avoid noisy raw result blocks', async () => {
+    const tom = {
+      memberName: 'tom',
+      role: 'member' as const,
+      sessionId: 'session-tom',
+      agentId: 'agent-tom',
+      isSidechain: true,
+    };
+    const candidate = makeCandidate('c1', '2026-04-12T16:00:00.000Z', tom, 'tool-1');
+
+    const recordSource = {
+      getTaskRecords: vi.fn(async () => candidate.records),
+    };
+    const summarySelector = {
+      selectSummaries: vi.fn(() => [candidate]),
+    };
+    const strictParser = {
+      parseFiles: vi.fn(async () => new Map([['/tmp/task.jsonl', []]])),
+    };
+    const detailSelector = {
+      selectDetail: vi.fn(() => ({
+        id: 'c1',
+        timestamp: '2026-04-12T16:00:00.000Z',
+        actor: tom,
+        source: { filePath: '/tmp/task.jsonl', messageUuid: 'assistant-tool', toolUseId: 'tool-1', sourceOrder: 1 },
+        records: candidate.records,
+        filteredMessages: [
+          {
+            uuid: 'assistant-tool',
+            parentUuid: null,
+            type: 'assistant' as const,
+            timestamp: new Date('2026-04-12T16:00:00.000Z'),
+            role: 'assistant',
+            content: [{ type: 'tool_use', id: 'tool-1', name: 'task_get', input: {} } as never],
+            toolCalls: [],
+            toolResults: [],
+            isSidechain: true,
+            isMeta: false,
+            isCompactSummary: false,
+          },
+          {
+            uuid: 'assistant-output',
+            parentUuid: 'assistant-tool',
+            type: 'assistant' as const,
+            timestamp: new Date('2026-04-12T16:00:01.000Z'),
+            role: 'assistant',
+            content: [{ type: 'text', text: '[{\"type\":\"text\",\"text\":\"{\\n  \\\"id\\\": \\\"task-a\\\"\\n}\"}]' } as never],
+            toolCalls: [],
+            toolResults: [],
+            sourceToolUseID: 'tool-1',
+            sourceToolAssistantUUID: 'assistant-tool',
+            isSidechain: true,
+            isMeta: false,
+            isCompactSummary: false,
+          },
+          {
+            uuid: 'user-result',
+            parentUuid: 'assistant-tool',
+            type: 'user' as const,
+            timestamp: new Date('2026-04-12T16:00:02.000Z'),
+            role: 'user',
+            content: [{ type: 'tool_result', tool_use_id: 'tool-1', content: 'ok' } as never],
+            toolCalls: [],
+            toolResults: [],
+            sourceToolUseID: 'tool-1',
+            sourceToolAssistantUUID: 'assistant-tool',
+            toolUseResult: { toolUseId: 'tool-1', content: 'ok' },
+            isSidechain: true,
+            isMeta: false,
+            isCompactSummary: false,
+          },
+        ],
+      })),
+    };
+    const buildBundleChunks = vi.fn((messages: ParsedMessage[]) => [{ id: messages[0]?.uuid }]);
+
+    const service = new BoardTaskLogStreamService(
+      recordSource as never,
+      summarySelector as never,
+      strictParser as never,
+      detailSelector as never,
+      { buildBundleChunks } as never,
+    );
+
+    await service.getTaskLogStream('demo', 'task-a');
+
+    expect(buildBundleChunks).toHaveBeenCalledTimes(1);
+    const mergedMessages = buildBundleChunks.mock.calls[0]?.[0] as ParsedMessage[];
+    expect(mergedMessages.map((message) => message.uuid)).toEqual(['assistant-tool', 'user-result']);
+  });
+
+  it('defaults to the single named participant and excludes unnamed lead noise when named task logs exist', async () => {
+    const tom = {
+      memberName: 'tom',
+      role: 'lead' as const,
+      sessionId: 'session-tom',
+      isSidechain: false,
+    };
+    const unknownLead = {
+      role: 'unknown' as const,
+      sessionId: 'session-lead',
+      isSidechain: false,
+    };
+    const candidates = [
+      makeCandidate('c1', '2026-04-12T16:00:00.000Z', tom, 'tool-1'),
+      makeCandidate('c2', '2026-04-12T16:01:00.000Z', unknownLead, 'tool-2'),
+    ];
+
+    const recordSource = {
+      getTaskRecords: vi.fn(async () => candidates.flatMap((candidate) => candidate.records)),
+    };
+    const summarySelector = {
+      selectSummaries: vi.fn(() => candidates),
+    };
+    const strictParser = {
+      parseFiles: vi.fn(async () => new Map([['/tmp/task.jsonl', []]])),
+    };
+    const detailSelector = {
+      selectDetail: vi.fn(({ candidate }: { candidate: BoardTaskExactLogBundleCandidate }) => ({
+        id: candidate.id,
+        timestamp: candidate.timestamp,
+        actor: candidate.actor,
+        source: candidate.source,
+        records: candidate.records,
+        filteredMessages: [makeMessage(candidate.id, candidate.timestamp, candidate.id)],
+      })),
+    };
+    const buildBundleChunks = vi.fn((messages: ParsedMessage[]) => [{ id: messages[0]?.uuid }]);
+
+    const service = new BoardTaskLogStreamService(
+      recordSource as never,
+      summarySelector as never,
+      strictParser as never,
+      detailSelector as never,
+      { buildBundleChunks } as never,
+    );
+
+    const response = await service.getTaskLogStream('demo', 'task-a');
+
+    expect(response.participants.map((participant) => participant.key)).toEqual(['member:tom']);
+    expect(response.defaultFilter).toBe('member:tom');
+    expect(response.segments.map((segment) => segment.participantKey)).toEqual(['member:tom']);
+  });
+
+  it('sanitizes json-like tool_result payload text while preserving the tool result message', async () => {
+    const tom = {
+      memberName: 'tom',
+      role: 'member' as const,
+      sessionId: 'session-tom',
+      agentId: 'agent-tom',
+      isSidechain: true,
+    };
+    const candidate = makeCandidate('c1', '2026-04-12T16:00:00.000Z', tom, 'tool-1');
+
+    const recordSource = {
+      getTaskRecords: vi.fn(async () => candidate.records),
+    };
+    const summarySelector = {
+      selectSummaries: vi.fn(() => [candidate]),
+    };
+    const strictParser = {
+      parseFiles: vi.fn(async () => new Map([['/tmp/task.jsonl', []]])),
+    };
+    const detailSelector = {
+      selectDetail: vi.fn(() => ({
+        id: 'c1',
+        timestamp: '2026-04-12T16:00:00.000Z',
+        actor: tom,
+        source: { filePath: '/tmp/task.jsonl', messageUuid: 'assistant-tool', toolUseId: 'tool-1', sourceOrder: 1 },
+        records: candidate.records,
+        filteredMessages: [
+          {
+            uuid: 'assistant-tool',
+            parentUuid: null,
+            type: 'assistant' as const,
+            timestamp: new Date('2026-04-12T16:00:00.000Z'),
+            role: 'assistant',
+            content: [{ type: 'tool_use', id: 'tool-1', name: 'task_get', input: {} } as never],
+            toolCalls: [],
+            toolResults: [],
+            isSidechain: true,
+            isMeta: false,
+            isCompactSummary: false,
+          },
+          {
+            uuid: 'user-result',
+            parentUuid: 'assistant-tool',
+            type: 'user' as const,
+            timestamp: new Date('2026-04-12T16:00:02.000Z'),
+            role: 'user',
+            content: [
+              {
+                type: 'tool_result',
+                tool_use_id: 'tool-1',
+                content: [{ type: 'text', text: '{\n  \"id\": \"task-a\"\n}' } as never],
+              } as never,
+            ],
+            toolCalls: [],
+            toolResults: [],
+            sourceToolUseID: 'tool-1',
+            sourceToolAssistantUUID: 'assistant-tool',
+            toolUseResult: { toolUseId: 'tool-1', content: '{\n  \"id\": \"task-a\"\n}' },
+            isSidechain: true,
+            isMeta: false,
+            isCompactSummary: false,
+          },
+        ],
+      })),
+    };
+    const buildBundleChunks = vi.fn((messages: ParsedMessage[]) => [{ id: messages[0]?.uuid }]);
+
+    const service = new BoardTaskLogStreamService(
+      recordSource as never,
+      summarySelector as never,
+      strictParser as never,
+      detailSelector as never,
+      { buildBundleChunks } as never,
+    );
+
+    await service.getTaskLogStream('demo', 'task-a');
+
+    const mergedMessages = buildBundleChunks.mock.calls[0]?.[0] as ParsedMessage[];
+    const toolResultMessage = mergedMessages.find((message) => message.uuid === 'user-result');
+    expect(toolResultMessage).toBeDefined();
+    const content = Array.isArray(toolResultMessage?.content) ? toolResultMessage.content : [];
+    expect(content[0]).toMatchObject({
+      type: 'tool_result',
+      tool_use_id: 'tool-1',
+      content: '',
+    });
+    expect(toolResultMessage?.toolUseResult).toEqual({ toolUseId: 'tool-1', content: '' });
+  });
+
+  it('drops read-only slices when the same participant has more meaningful task logs', async () => {
+    const tom = {
+      memberName: 'tom',
+      role: 'lead' as const,
+      sessionId: 'session-tom',
+      isSidechain: false,
+    };
+    const readCandidate = { ...makeCandidate('c1', '2026-04-12T16:00:00.000Z', tom, 'tool-1'), actionCategory: 'read' as const, canonicalToolName: 'task_get' };
+    const commentCandidate = { ...makeCandidate('c2', '2026-04-12T16:01:00.000Z', tom, 'tool-2'), actionCategory: 'comment' as const, canonicalToolName: 'task_add_comment' };
+
+    const recordSource = {
+      getTaskRecords: vi.fn(async () => [...readCandidate.records, ...commentCandidate.records]),
+    };
+    const summarySelector = {
+      selectSummaries: vi.fn(() => [readCandidate, commentCandidate]),
+    };
+    const strictParser = {
+      parseFiles: vi.fn(async () => new Map([['/tmp/task.jsonl', []]])),
+    };
+    const detailSelector = {
+      selectDetail: vi.fn(({ candidate }: { candidate: BoardTaskExactLogBundleCandidate }) => ({
+        id: candidate.id,
+        timestamp: candidate.timestamp,
+        actor: candidate.actor,
+        source: candidate.source,
+        records: candidate.records,
+        filteredMessages: [makeMessage(candidate.id, candidate.timestamp, candidate.id)],
+      })),
+    };
+    const buildBundleChunks = vi.fn((messages: ParsedMessage[]) => [{ id: messages[0]?.uuid }]);
+
+    const service = new BoardTaskLogStreamService(
+      recordSource as never,
+      summarySelector as never,
+      strictParser as never,
+      detailSelector as never,
+      { buildBundleChunks } as never,
+    );
+
+    const response = await service.getTaskLogStream('demo', 'task-a');
+
+    expect(response.segments).toHaveLength(1);
+    expect(buildBundleChunks).toHaveBeenCalledTimes(1);
+    const mergedMessages = buildBundleChunks.mock.calls[0]?.[0] as ParsedMessage[];
+    expect(mergedMessages.map((message) => message.uuid)).toEqual(['c2']);
+  });
+
+  it('extracts task_add_comment text from json-like tool result payload', async () => {
+    const tom = {
+      memberName: 'tom',
+      role: 'lead' as const,
+      sessionId: 'session-tom',
+      isSidechain: false,
+    };
+    const candidate = {
+      ...makeCandidate('c1', '2026-04-12T16:00:00.000Z', tom, 'tool-1'),
+      actionCategory: 'comment' as const,
+      canonicalToolName: 'task_add_comment',
+    };
+
+    const recordSource = {
+      getTaskRecords: vi.fn(async () => candidate.records),
+    };
+    const summarySelector = {
+      selectSummaries: vi.fn(() => [candidate]),
+    };
+    const strictParser = {
+      parseFiles: vi.fn(async () => new Map([['/tmp/task.jsonl', []]])),
+    };
+    const detailSelector = {
+      selectDetail: vi.fn(() => ({
+        id: 'c1',
+        timestamp: '2026-04-12T16:00:00.000Z',
+        actor: tom,
+        source: { filePath: '/tmp/task.jsonl', messageUuid: 'assistant-tool', toolUseId: 'tool-1', sourceOrder: 1 },
+        records: candidate.records,
+        filteredMessages: [
+          {
+            uuid: 'assistant-tool',
+            parentUuid: null,
+            type: 'assistant' as const,
+            timestamp: new Date('2026-04-12T16:00:00.000Z'),
+            role: 'assistant',
+            content: [{ type: 'tool_use', id: 'tool-1', name: 'task_add_comment', input: {} } as never],
+            toolCalls: [],
+            toolResults: [],
+            isSidechain: false,
+            isMeta: false,
+            isCompactSummary: false,
+          },
+          {
+            uuid: 'user-result',
+            parentUuid: 'assistant-tool',
+            type: 'user' as const,
+            timestamp: new Date('2026-04-12T16:00:02.000Z'),
+            role: 'user',
+            content: [
+              {
+                type: 'tool_result',
+                tool_use_id: 'tool-1',
+                content: [{ type: 'text', text: '{\"comment\":{\"text\":\"useful comment\"}}' } as never],
+              } as never,
+            ],
+            toolCalls: [],
+            toolResults: [],
+            sourceToolUseID: 'tool-1',
+            sourceToolAssistantUUID: 'assistant-tool',
+            toolUseResult: { toolUseId: 'tool-1', content: '{"comment":{"text":"useful comment"}}' },
+            isSidechain: false,
+            isMeta: false,
+            isCompactSummary: false,
+          },
+        ],
+      })),
+    };
+    const buildBundleChunks = vi.fn((messages: ParsedMessage[]) => [{ id: messages[0]?.uuid }]);
+
+    const service = new BoardTaskLogStreamService(
+      recordSource as never,
+      summarySelector as never,
+      strictParser as never,
+      detailSelector as never,
+      { buildBundleChunks } as never,
+    );
+
+    await service.getTaskLogStream('demo', 'task-a');
+
+    const mergedMessages = buildBundleChunks.mock.calls[0]?.[0] as ParsedMessage[];
+    const toolResultMessage = mergedMessages.find((message) => message.uuid === 'user-result');
+    const content = Array.isArray(toolResultMessage?.content) ? toolResultMessage.content : [];
+    expect(content[0]).toMatchObject({
+      type: 'tool_result',
+      tool_use_id: 'tool-1',
+      content: 'useful comment',
+    });
+    expect(toolResultMessage?.toolUseResult).toEqual({ toolUseId: 'tool-1', content: 'useful comment' });
+  });
+});

test/main/services/team/BoardTaskTranscriptContract.test.ts

@@ -0,0 +1,196 @@
+import { describe, expect, it } from 'vitest';
+import fixture from '../../../fixtures/team/board-task-activity-message-v1.json';
+
+import {
+  parseBoardTaskLinks,
+  parseBoardTaskToolActions,
+} from '../../../../src/main/services/team/taskLogs/contract/BoardTaskTranscriptContract';
+
+describe('BoardTaskTranscriptContract', () => {
+  it('salvages valid board-task links from mixed payloads', () => {
+    const parsed = parseBoardTaskLinks([
+      null,
+      {
+        schemaVersion: 1,
+        task: { ref: 'abcd1234', refKind: 'display', canonicalId: 'task-a' },
+        targetRole: 'subject',
+        linkKind: 'lifecycle',
+        actorContext: { relation: 'idle' },
+      },
+      {
+        schemaVersion: 1,
+        task: { ref: '', refKind: 'display' },
+        targetRole: 'subject',
+        linkKind: 'lifecycle',
+        actorContext: { relation: 'idle' },
+      },
+    ]);
+
+    expect(parsed).toEqual([
+      {
+        schemaVersion: 1,
+        task: { ref: 'abcd1234', refKind: 'display', canonicalId: 'task-a' },
+        targetRole: 'subject',
+        linkKind: 'lifecycle',
+        actorContext: { relation: 'idle' },
+      },
+    ]);
+  });
+
+  it('salvages valid task tool actions from mixed payloads', () => {
+    const parsed = parseBoardTaskToolActions([
+      {
+        schemaVersion: 1,
+        toolUseId: 'tool-1',
+        canonicalToolName: 'task_add_comment',
+        resultRefs: { commentId: 'comment-1' },
+      },
+      {
+        schemaVersion: 1,
+        canonicalToolName: 'task_add_comment',
+      },
+    ]);
+
+    expect(parsed).toEqual([
+      {
+        schemaVersion: 1,
+        toolUseId: 'tool-1',
+        canonicalToolName: 'task_add_comment',
+        resultRefs: { commentId: 'comment-1' },
+      },
+    ]);
+  });
+
+  it('parses the documented fixture example', () => {
+    expect(parseBoardTaskLinks(fixture.boardTaskLinks)).toEqual([
+      {
+        schemaVersion: 1,
+        toolUseId: 'tool-1',
+        task: {
+          ref: 'abcd1234',
+          refKind: 'display',
+          canonicalId: '123e4567-e89b-12d3-a456-426614174000',
+        },
+        targetRole: 'subject',
+        linkKind: 'lifecycle',
+        taskArgumentSlot: 'taskId',
+        actorContext: { relation: 'idle' },
+      },
+    ]);
+
+    expect(parseBoardTaskToolActions(fixture.boardTaskToolActions)).toEqual([
+      {
+        schemaVersion: 1,
+        toolUseId: 'tool-1',
+        canonicalToolName: 'task_add_comment',
+        resultRefs: { commentId: 'comment-1' },
+      },
+    ]);
+  });
+
+  it('preserves semantic null owner and clarification values', () => {
+    const parsed = parseBoardTaskToolActions([
+      {
+        schemaVersion: 1,
+        toolUseId: 'tool-2',
+        canonicalToolName: 'task_set_owner',
+        input: { owner: null },
+      },
+      {
+        schemaVersion: 1,
+        toolUseId: 'tool-3',
+        canonicalToolName: 'task_set_clarification',
+        input: { clarification: 'clear' },
+      },
+    ]);
+
+    expect(parsed).toEqual([
+      {
+        schemaVersion: 1,
+        toolUseId: 'tool-2',
+        canonicalToolName: 'task_set_owner',
+        input: { owner: null },
+      },
+      {
+        schemaVersion: 1,
+        toolUseId: 'tool-3',
+        canonicalToolName: 'task_set_clarification',
+        input: { clarification: null },
+      },
+    ]);
+  });
+
+  it('accepts legacy version fields while preferring schemaVersion going forward', () => {
+    const parsed = parseBoardTaskLinks([
+      {
+        version: 1,
+        task: { ref: 'abcd1234', refKind: 'display' },
+        targetRole: 'subject',
+        linkKind: 'execution',
+        actorContext: { relation: 'same_task' },
+      },
+    ]);
+
+    expect(parsed).toEqual([
+      {
+        schemaVersion: 1,
+        task: { ref: 'abcd1234', refKind: 'display' },
+        targetRole: 'subject',
+        linkKind: 'execution',
+        actorContext: { relation: 'same_task' },
+      },
+    ]);
+  });
+
+  it('sanitizes impossible actor scope details unless relation is other_active_task', () => {
+    const parsed = parseBoardTaskLinks([
+      {
+        schemaVersion: 1,
+        task: { ref: 'abcd1234', refKind: 'display' },
+        targetRole: 'subject',
+        linkKind: 'execution',
+        actorContext: {
+          relation: 'same_task',
+          activeTask: { ref: 'efgh5678', refKind: 'display' },
+          activePhase: 'work',
+          activeExecutionSeq: 2,
+        },
+      },
+    ]);
+
+    expect(parsed).toEqual([
+      {
+        schemaVersion: 1,
+        task: { ref: 'abcd1234', refKind: 'display' },
+        targetRole: 'subject',
+        linkKind: 'execution',
+        actorContext: { relation: 'same_task' },
+      },
+    ]);
+  });
+
+  it('preserves execution toolUseId while still dropping execution taskArgumentSlot', () => {
+    const parsed = parseBoardTaskLinks([
+      {
+        schemaVersion: 1,
+        toolUseId: 'tool-1',
+        task: { ref: 'abcd1234', refKind: 'display' },
+        targetRole: 'subject',
+        linkKind: 'execution',
+        taskArgumentSlot: 'taskId',
+        actorContext: { relation: 'same_task' },
+      },
+    ]);
+
+    expect(parsed).toEqual([
+      {
+        schemaVersion: 1,
+        toolUseId: 'tool-1',
+        task: { ref: 'abcd1234', refKind: 'display' },
+        targetRole: 'subject',
+        linkKind: 'execution',
+        actorContext: { relation: 'same_task' },
+      },
+    ]);
+  });
+});

test/main/services/team/TaskBoundaryParser.test.ts

@@ -64,6 +64,53 @@ describe('TaskBoundaryParser', () => {
     expect(result.boundaries.every((entry) => entry.mechanism === 'mcp')).toBe(true);
   });
 
+  it('detects fully-qualified agent-teams MCP task boundaries', async () => {
+    tmpDir = await fs.mkdtemp(path.join(os.tmpdir(), 'task-boundary-parser-'));
+    const jsonlPath = path.join(tmpDir, 'mcp-qualified.jsonl');
+    await fs.writeFile(
+      jsonlPath,
+      [
+        JSON.stringify({
+          timestamp: '2026-03-01T10:00:00.000Z',
+          type: 'assistant',
+          message: {
+            role: 'assistant',
+            content: [
+              {
+                type: 'tool_use',
+                id: 'tool-1',
+                name: 'mcp__agent-teams__task_start',
+                input: { taskId: 'task-123', teamName: 'demo' },
+              },
+            ],
+          },
+        }),
+        JSON.stringify({
+          timestamp: '2026-03-01T10:10:00.000Z',
+          type: 'assistant',
+          message: {
+            role: 'assistant',
+            content: [
+              {
+                type: 'tool_use',
+                id: 'tool-2',
+                name: 'mcp__agent_teams__task_complete',
+                input: { taskId: 'task-123', teamName: 'demo' },
+              },
+            ],
+          },
+        }),
+      ].join('\n') + '\n',
+      'utf8'
+    );
+
+    const result = await new TaskBoundaryParser().parseBoundaries(jsonlPath);
+
+    expect(result.detectedMechanism).toBe('mcp');
+    expect(result.boundaries).toHaveLength(2);
+    expect(result.boundaries.map((entry) => entry.event)).toEqual(['start', 'complete']);
+  });
+
   it('ignores legacy teamctl bash markers and keeps modern MCP markers only', async () => {
     tmpDir = await fs.mkdtemp(path.join(os.tmpdir(), 'task-boundary-parser-'));
     const jsonlPath = path.join(tmpDir, 'mixed.jsonl');

test/main/services/team/TeamMemberLogsFinder.test.ts

@@ -867,6 +867,34 @@ describe('TeamMemberLogsFinder', () => {
     await expect(finder.hasTaskUpdateMarker(noisePath, 'task-42')).resolves.toBe(false);
   });
 
+  it('detects fully-qualified agent-teams task markers in JSONL', async () => {
+    tmpDir = await fs.mkdtemp(path.join(os.tmpdir(), 'claude-team-markers-'));
+    const qualifiedPath = path.join(tmpDir, 'qualified.jsonl');
+
+    await fs.writeFile(
+      qualifiedPath,
+      JSON.stringify({
+        timestamp: '2026-01-01T00:00:00.000Z',
+        type: 'assistant',
+        message: {
+          role: 'assistant',
+          content: [
+            {
+              type: 'tool_use',
+              name: 'mcp__agent-teams__task_start',
+              input: { teamName: 'demo', taskId: 'task-42' },
+            },
+          ],
+        },
+      }) + '\n',
+      'utf8'
+    );
+
+    const finder = new TeamMemberLogsFinder();
+
+    await expect(finder.hasTaskUpdateMarker(qualifiedPath, 'task-42')).resolves.toBe(true);
+  });
+
   it('findLogFileRefsForTask returns correct refs for a task', async () => {
     tmpDir = await fs.mkdtemp(path.join(os.tmpdir(), 'claude-team-refs-'));
     setClaudeBasePathOverride(tmpDir);

test/renderer/api/httpClient.exactTaskLogs.test.ts

@@ -0,0 +1,37 @@
+import { afterEach, describe, expect, it, vi } from 'vitest';
+
+import { HttpAPIClient } from '../../../src/renderer/api/httpClient';
+
+class MockEventSource {
+  onopen: (() => void) | null = null;
+  onerror: (() => void) | null = null;
+  addEventListener(): void {}
+  close(): void {}
+}
+
+describe('HttpAPIClient exact task logs browser fallback', () => {
+  afterEach(() => {
+    vi.unstubAllGlobals();
+    vi.restoreAllMocks();
+  });
+
+  it('returns safe fallback shapes for exact task logs in browser mode', async () => {
+    vi.stubGlobal('EventSource', MockEventSource);
+    const warnSpy = vi.spyOn(console, 'warn').mockImplementation(() => {});
+    const client = new HttpAPIClient('http://localhost:9999');
+
+    await expect(client.teams.getTaskLogStream('demo', 'task-a')).resolves.toEqual({
+      participants: [],
+      defaultFilter: 'all',
+      segments: [],
+    });
+    await expect(client.teams.getTaskExactLogSummaries('demo', 'task-a')).resolves.toEqual({
+      items: [],
+    });
+    await expect(
+      client.teams.getTaskExactLogDetail('demo', 'task-a', 'bundle-1', 'gen-1')
+    ).resolves.toEqual({ status: 'missing' });
+
+    expect(warnSpy).toHaveBeenCalled();
+  });
+});

test/renderer/components/team/taskLogs/ExactTaskLogsSection.test.ts

@@ -0,0 +1,288 @@
+import React, { act } from 'react';
+import { createRoot } from 'react-dom/client';
+import { afterEach, describe, expect, it, vi } from 'vitest';
+
+import type {
+  BoardTaskExactLogDetailResult,
+  BoardTaskExactLogSummariesResponse,
+} from '../../../../../src/shared/types';
+
+const apiState = {
+  getTaskExactLogSummaries: vi.fn<
+    (teamName: string, taskId: string) => Promise<BoardTaskExactLogSummariesResponse>
+  >(),
+  getTaskExactLogDetail: vi.fn<
+    (
+      teamName: string,
+      taskId: string,
+      exactLogId: string,
+      expectedSourceGeneration: string
+    ) => Promise<BoardTaskExactLogDetailResult>
+  >(),
+};
+
+vi.mock('@renderer/api', () => ({
+  api: {
+    teams: {
+      getTaskExactLogSummaries: (...args: Parameters<typeof apiState.getTaskExactLogSummaries>) =>
+        apiState.getTaskExactLogSummaries(...args),
+      getTaskExactLogDetail: (...args: Parameters<typeof apiState.getTaskExactLogDetail>) =>
+        apiState.getTaskExactLogDetail(...args),
+    },
+  },
+}));
+
+vi.mock('@renderer/components/team/members/MemberExecutionLog', () => ({
+  MemberExecutionLog: ({ memberName }: { memberName?: string }) =>
+    React.createElement('div', { 'data-testid': 'member-execution-log' }, memberName ?? 'no-name'),
+}));
+
+import { ExactTaskLogsSection } from '@renderer/components/team/taskLogs/ExactTaskLogsSection';
+
+function flushMicrotasks(): Promise<void> {
+  return Promise.resolve();
+}
+
+describe('ExactTaskLogsSection', () => {
+  afterEach(() => {
+    document.body.innerHTML = '';
+    apiState.getTaskExactLogSummaries.mockReset();
+    apiState.getTaskExactLogDetail.mockReset();
+    vi.unstubAllGlobals();
+  });
+
+  it('renders empty state when exact summaries are absent', async () => {
+    vi.stubGlobal('IS_REACT_ACT_ENVIRONMENT', true);
+    apiState.getTaskExactLogSummaries.mockResolvedValueOnce({ items: [] });
+
+    const host = document.createElement('div');
+    document.body.appendChild(host);
+    const root = createRoot(host);
+
+    await act(async () => {
+      root.render(React.createElement(ExactTaskLogsSection, { teamName: 'demo', taskId: 'task-a' }));
+      await flushMicrotasks();
+    });
+
+    expect(host.textContent).toContain('Exact Task Logs');
+    expect(host.textContent).toContain('No exact task logs yet');
+
+    await act(async () => {
+      root.unmount();
+      await flushMicrotasks();
+    });
+  });
+
+  it('renders loading state while summaries are still pending', async () => {
+    vi.stubGlobal('IS_REACT_ACT_ENVIRONMENT', true);
+    let resolveSummaries: ((value: BoardTaskExactLogSummariesResponse) => void) | null = null;
+    apiState.getTaskExactLogSummaries.mockImplementationOnce(
+      () =>
+        new Promise<BoardTaskExactLogSummariesResponse>((resolve) => {
+          resolveSummaries = resolve;
+        })
+    );
+
+    const host = document.createElement('div');
+    document.body.appendChild(host);
+    const root = createRoot(host);
+
+    await act(async () => {
+      root.render(React.createElement(ExactTaskLogsSection, { teamName: 'demo', taskId: 'task-a' }));
+      await flushMicrotasks();
+    });
+
+    expect(host.textContent).toContain('Loading exact task logs');
+
+    await act(async () => {
+      resolveSummaries?.({ items: [] });
+      await flushMicrotasks();
+    });
+
+    await act(async () => {
+      root.unmount();
+      await flushMicrotasks();
+    });
+  });
+
+  it('renders error state when summaries fail to load', async () => {
+    vi.stubGlobal('IS_REACT_ACT_ENVIRONMENT', true);
+    apiState.getTaskExactLogSummaries.mockRejectedValueOnce(new Error('boom'));
+
+    const host = document.createElement('div');
+    document.body.appendChild(host);
+    const root = createRoot(host);
+
+    await act(async () => {
+      root.render(React.createElement(ExactTaskLogsSection, { teamName: 'demo', taskId: 'task-a' }));
+      await flushMicrotasks();
+      await flushMicrotasks();
+    });
+
+    expect(host.textContent).toContain('boom');
+
+    await act(async () => {
+      root.unmount();
+      await flushMicrotasks();
+    });
+  });
+
+  it('reloads summaries on stale detail and then renders exact detail', async () => {
+    vi.stubGlobal('IS_REACT_ACT_ENVIRONMENT', true);
+    apiState.getTaskExactLogSummaries
+      .mockResolvedValueOnce({
+        items: [
+          {
+            id: 'tool:/tmp/task.jsonl:tool-1',
+            timestamp: '2026-04-12T18:00:00.000Z',
+            actor: {
+              memberName: 'alice',
+              role: 'member',
+              sessionId: 'session-1',
+              agentId: 'agent-1',
+              isSidechain: true,
+            },
+            source: {
+              filePath: '/tmp/task.jsonl',
+              messageUuid: 'assistant-1',
+              toolUseId: 'tool-1',
+              sourceOrder: 1,
+            },
+            anchorKind: 'tool',
+            actionLabel: 'Added a comment',
+            actionCategory: 'comment',
+            canonicalToolName: 'task_add_comment',
+            linkKinds: ['board_action'],
+            canLoadDetail: true,
+            sourceGeneration: 'gen-1',
+          },
+        ],
+      })
+      .mockResolvedValueOnce({
+        items: [
+          {
+            id: 'tool:/tmp/task.jsonl:tool-1',
+            timestamp: '2026-04-12T18:00:00.000Z',
+            actor: {
+              memberName: 'alice',
+              role: 'member',
+              sessionId: 'session-1',
+              agentId: 'agent-1',
+              isSidechain: true,
+            },
+            source: {
+              filePath: '/tmp/task.jsonl',
+              messageUuid: 'assistant-1',
+              toolUseId: 'tool-1',
+              sourceOrder: 1,
+            },
+            anchorKind: 'tool',
+            actionLabel: 'Added a comment',
+            actionCategory: 'comment',
+            canonicalToolName: 'task_add_comment',
+            linkKinds: ['board_action'],
+            canLoadDetail: true,
+            sourceGeneration: 'gen-2',
+          },
+        ],
+      });
+    apiState.getTaskExactLogDetail
+      .mockResolvedValueOnce({ status: 'stale' })
+      .mockResolvedValueOnce({
+        status: 'ok',
+        detail: {
+          id: 'tool:/tmp/task.jsonl:tool-1',
+          chunks: [],
+        },
+      });
+
+    const host = document.createElement('div');
+    document.body.appendChild(host);
+    const root = createRoot(host);
+
+    await act(async () => {
+      root.render(React.createElement(ExactTaskLogsSection, { teamName: 'demo', taskId: 'task-a' }));
+      await flushMicrotasks();
+    });
+
+    const button = host.querySelector('button');
+    expect(button).not.toBeNull();
+
+    await act(async () => {
+      button?.dispatchEvent(new MouseEvent('click', { bubbles: true }));
+      await flushMicrotasks();
+      await flushMicrotasks();
+    });
+
+    await vi.waitFor(() => {
+      expect(apiState.getTaskExactLogSummaries).toHaveBeenCalledTimes(2);
+      expect(apiState.getTaskExactLogDetail).toHaveBeenNthCalledWith(
+        1,
+        'demo',
+        'task-a',
+        'tool:/tmp/task.jsonl:tool-1',
+        'gen-1'
+      );
+      expect(apiState.getTaskExactLogDetail).toHaveBeenNthCalledWith(
+        2,
+        'demo',
+        'task-a',
+        'tool:/tmp/task.jsonl:tool-1',
+        'gen-2'
+      );
+      expect(host.querySelector('[data-testid=\"member-execution-log\"]')?.textContent).toBe('alice');
+    });
+
+    await act(async () => {
+      root.unmount();
+      await flushMicrotasks();
+    });
+  });
+
+  it('renders descriptive action labels and lead-session fallback actor text', async () => {
+    vi.stubGlobal('IS_REACT_ACT_ENVIRONMENT', true);
+    apiState.getTaskExactLogSummaries.mockResolvedValueOnce({
+      items: [
+        {
+          id: 'tool:/tmp/task.jsonl:tool-1',
+          timestamp: '2026-04-12T18:00:00.000Z',
+          actor: {
+            role: 'lead',
+            sessionId: 'lead-session-1',
+            isSidechain: false,
+          },
+          source: {
+            filePath: '/tmp/task.jsonl',
+            messageUuid: 'assistant-1',
+            toolUseId: 'tool-1',
+            sourceOrder: 1,
+          },
+          anchorKind: 'tool',
+          actionLabel: 'Requested review',
+          actionCategory: 'review',
+          canonicalToolName: 'review_request',
+          linkKinds: ['board_action'],
+          canLoadDetail: false,
+        },
+      ],
+    });
+
+    const host = document.createElement('div');
+    document.body.appendChild(host);
+    const root = createRoot(host);
+
+    await act(async () => {
+      root.render(React.createElement(ExactTaskLogsSection, { teamName: 'demo', taskId: 'task-a' }));
+      await flushMicrotasks();
+    });
+
+    expect(host.textContent).toContain('lead session');
+    expect(host.textContent).toContain('Requested review');
+    expect(host.textContent).toContain('tool');
+
+    await act(async () => {
+      root.unmount();
+      await flushMicrotasks();
+    });
+  });
+});

test/renderer/components/team/taskLogs/TaskLogStreamSection.integration.test.ts

@@ -0,0 +1,550 @@
+import { mkdtemp, rm, writeFile } from 'fs/promises';
+import { tmpdir } from 'os';
+import path from 'path';
+import React, { act } from 'react';
+import { createRoot } from 'react-dom/client';
+import { afterEach, describe, expect, it, vi } from 'vitest';
+
+import { BoardTaskLogStreamService } from '../../../../../src/main/services/team/taskLogs/stream/BoardTaskLogStreamService';
+import { BoardTaskActivityRecordBuilder } from '../../../../../src/main/services/team/taskLogs/activity/BoardTaskActivityRecordBuilder';
+import { BoardTaskActivityTranscriptReader } from '../../../../../src/main/services/team/taskLogs/activity/BoardTaskActivityTranscriptReader';
+import { TooltipProvider } from '../../../../../src/renderer/components/ui/tooltip';
+
+import type { TeamTask } from '../../../../../src/shared/types';
+
+const TEAM_NAME = 'beacon-desk-2';
+const TASK_ID = 'c414cd52-470a-4b51-ae1e-e5250fff95d7';
+
+const apiState = {
+  getTaskLogStream: vi.fn(),
+};
+
+vi.mock('@renderer/api', () => ({
+  api: {
+    teams: {
+      getTaskLogStream: (...args: Parameters<typeof apiState.getTaskLogStream>) =>
+        apiState.getTaskLogStream(...args),
+    },
+  },
+}));
+
+import { TaskLogStreamSection } from '@renderer/components/team/taskLogs/TaskLogStreamSection';
+
+function createTask(overrides: Partial<TeamTask> = {}): TeamTask {
+  return {
+    id: TASK_ID,
+    displayId: 'c414cd52',
+    subject: 'Help alice: fast lint/link check',
+    status: 'completed',
+    ...overrides,
+  };
+}
+
+function createAssistantEntry(args: {
+  uuid: string;
+  timestamp: string;
+  content: unknown[];
+  agentName?: string;
+  sessionId?: string;
+  requestId?: string;
+}): Record<string, unknown> {
+  return {
+    type: 'assistant',
+    uuid: args.uuid,
+    timestamp: args.timestamp,
+    sessionId: args.sessionId ?? 'session-tom',
+    teamName: TEAM_NAME,
+    agentName: args.agentName ?? 'tom',
+    isSidechain: false,
+    requestId: args.requestId,
+    message: {
+      id: `${args.uuid}-msg`,
+      role: 'assistant',
+      model: 'claude-test',
+      type: 'message',
+      stop_reason: 'tool_use',
+      stop_sequence: null,
+      usage: {
+        input_tokens: 0,
+        output_tokens: 0,
+      },
+      content: args.content,
+    },
+  };
+}
+
+function createUserEntry(args: {
+  uuid: string;
+  timestamp: string;
+  content: unknown[];
+  boardTaskLinks?: unknown[];
+  boardTaskToolActions?: unknown[];
+  toolUseResult?: unknown;
+  sourceToolAssistantUUID?: string;
+  agentName?: string;
+  sessionId?: string;
+}): Record<string, unknown> {
+  return {
+    type: 'user',
+    uuid: args.uuid,
+    timestamp: args.timestamp,
+    sessionId: args.sessionId ?? 'session-tom',
+    teamName: TEAM_NAME,
+    agentName: args.agentName ?? 'tom',
+    isSidechain: false,
+    ...(args.boardTaskLinks ? { boardTaskLinks: args.boardTaskLinks } : {}),
+    ...(args.boardTaskToolActions ? { boardTaskToolActions: args.boardTaskToolActions } : {}),
+    ...(args.toolUseResult ? { toolUseResult: args.toolUseResult } : {}),
+    ...(args.sourceToolAssistantUUID
+      ? { sourceToolAssistantUUID: args.sourceToolAssistantUUID }
+      : {}),
+    message: {
+      role: 'user',
+      content: args.content,
+    },
+  };
+}
+
+async function buildStreamResponse(transcriptPath: string) {
+  const task = createTask();
+  const transcriptReader = new BoardTaskActivityTranscriptReader();
+  const recordBuilder = new BoardTaskActivityRecordBuilder();
+  const messages = await transcriptReader.readFiles([transcriptPath]);
+  const recordSource = {
+    getTaskRecords: async () =>
+      recordBuilder.buildForTask({
+        teamName: TEAM_NAME,
+        targetTask: task,
+        tasks: [task],
+        messages,
+      }),
+  };
+
+  const service = new BoardTaskLogStreamService(recordSource as never);
+  return service.getTaskLogStream(TEAM_NAME, task.id);
+}
+
+function flushMicrotasks(): Promise<void> {
+  return Promise.resolve();
+}
+
+describe('TaskLogStreamSection integration', () => {
+  const tempDirs: string[] = [];
+
+  afterEach(async () => {
+    document.body.innerHTML = '';
+    apiState.getTaskLogStream.mockReset();
+    vi.unstubAllGlobals();
+    await Promise.all(
+      tempDirs.splice(0).map((dir) => rm(dir, { recursive: true, force: true })),
+    );
+  });
+
+  it('renders worker tools and does not show empty array output blocks', async () => {
+    vi.stubGlobal('IS_REACT_ACT_ENVIRONMENT', true);
+
+    const dir = await mkdtemp(path.join(tmpdir(), 'task-log-stream-render-'));
+    tempDirs.push(dir);
+    const transcriptPath = path.join(dir, 'session.jsonl');
+
+    const lines = [
+      createUserEntry({
+        uuid: 'u-start',
+        timestamp: '2026-04-12T15:36:07.747Z',
+        content: [
+          {
+            type: 'tool_result',
+            tool_use_id: 'call-task-start',
+            content: 'ok',
+          },
+        ],
+        boardTaskLinks: [
+          {
+            schemaVersion: 1,
+            toolUseId: 'call-task-start',
+            task: {
+              ref: TASK_ID,
+              refKind: 'canonical',
+              canonicalId: TASK_ID,
+            },
+            targetRole: 'subject',
+            linkKind: 'lifecycle',
+            taskArgumentSlot: 'taskId',
+            actorContext: {
+              relation: 'idle',
+            },
+          },
+        ],
+        boardTaskToolActions: [
+          {
+            schemaVersion: 1,
+            toolUseId: 'call-task-start',
+            canonicalToolName: 'task_start',
+          },
+        ],
+        toolUseResult: {
+          toolUseId: 'call-task-start',
+          content: '{"id":"c414cd52"}',
+        },
+      }),
+      createAssistantEntry({
+        uuid: 'a-grep',
+        timestamp: '2026-04-12T15:36:14.522Z',
+        requestId: 'req-grep',
+        content: [
+          {
+            type: 'tool_use',
+            id: 'call-grep',
+            name: 'Grep',
+            input: {
+              pattern: 'ITERATION_PLAN',
+              path: 'docs-site',
+            },
+          },
+        ],
+      }),
+      createUserEntry({
+        uuid: 'u-grep',
+        timestamp: '2026-04-12T15:36:14.749Z',
+        sourceToolAssistantUUID: 'a-grep',
+        content: [
+          {
+            type: 'tool_result',
+            tool_use_id: 'call-grep',
+            content: 'docs-site/guide.md:42: ITERATION_PLAN',
+          },
+        ],
+        boardTaskLinks: [
+          {
+            schemaVersion: 1,
+            toolUseId: 'call-grep',
+            task: {
+              ref: TASK_ID,
+              refKind: 'canonical',
+              canonicalId: TASK_ID,
+            },
+            targetRole: 'subject',
+            linkKind: 'execution',
+            actorContext: {
+              relation: 'same_task',
+            },
+          },
+        ],
+        toolUseResult: {
+          toolUseId: 'call-grep',
+          content: 'docs-site/guide.md:42: ITERATION_PLAN',
+        },
+      }),
+      createAssistantEntry({
+        uuid: 'a-edit',
+        timestamp: '2026-04-12T15:36:40.000Z',
+        requestId: 'req-edit',
+        content: [
+          {
+            type: 'tool_use',
+            id: 'call-edit',
+            name: 'Edit',
+            input: {
+              file_path: 'docs-site/guide.md',
+            },
+          },
+        ],
+      }),
+      createUserEntry({
+        uuid: 'u-edit',
+        timestamp: '2026-04-12T15:36:40.200Z',
+        sourceToolAssistantUUID: 'a-edit',
+        content: [
+          {
+            type: 'tool_result',
+            tool_use_id: 'call-edit',
+            content: 'File updated',
+          },
+        ],
+        boardTaskLinks: [
+          {
+            schemaVersion: 1,
+            toolUseId: 'call-edit',
+            task: {
+              ref: TASK_ID,
+              refKind: 'canonical',
+              canonicalId: TASK_ID,
+            },
+            targetRole: 'subject',
+            linkKind: 'execution',
+            actorContext: {
+              relation: 'same_task',
+            },
+          },
+        ],
+        toolUseResult: {
+          toolUseId: 'call-edit',
+          content: 'File updated',
+        },
+      }),
+      createAssistantEntry({
+        uuid: 'a-comment',
+        timestamp: '2026-04-12T15:47:44.500Z',
+        requestId: 'req-comment',
+        content: [
+          {
+            type: 'tool_use',
+            id: 'call-comment',
+            name: 'mcp__agent-teams__task_add_comment',
+            input: {
+              taskId: TASK_ID,
+              text: 'Audit complete',
+            },
+          },
+        ],
+      }),
+      createUserEntry({
+        uuid: 'u-comment',
+        timestamp: '2026-04-12T15:47:44.773Z',
+        sourceToolAssistantUUID: 'a-comment',
+        content: [
+          {
+            type: 'tool_result',
+            tool_use_id: 'call-comment',
+            content: [
+              {
+                type: 'text',
+                text: '{\n  "commentId": "comment-1",\n  "comment": {\n    "text": "Audit complete"\n  }\n}',
+              },
+            ],
+          },
+        ],
+        boardTaskLinks: [
+          {
+            schemaVersion: 1,
+            toolUseId: 'call-comment',
+            task: {
+              ref: TASK_ID,
+              refKind: 'canonical',
+              canonicalId: TASK_ID,
+            },
+            targetRole: 'subject',
+            linkKind: 'board_action',
+            taskArgumentSlot: 'taskId',
+            actorContext: {
+              relation: 'same_task',
+            },
+          },
+        ],
+        boardTaskToolActions: [
+          {
+            schemaVersion: 1,
+            toolUseId: 'call-comment',
+            canonicalToolName: 'task_add_comment',
+            resultRefs: {
+              commentId: 'comment-1',
+            },
+          },
+        ],
+        toolUseResult: [
+          {
+            type: 'text',
+            text: '{\n  "commentId": "comment-1",\n  "comment": {\n    "text": "Audit complete"\n  }\n}',
+          },
+        ],
+      }),
+    ];
+
+    await writeFile(
+      transcriptPath,
+      `${lines.map((line) => JSON.stringify(line)).join('\n')}\n`,
+      'utf8',
+    );
+
+    apiState.getTaskLogStream.mockResolvedValueOnce(await buildStreamResponse(transcriptPath));
+
+    const host = document.createElement('div');
+    document.body.appendChild(host);
+    const root = createRoot(host);
+
+    await act(async () => {
+      root.render(
+        React.createElement(
+          TooltipProvider,
+          null,
+          React.createElement(TaskLogStreamSection, { teamName: TEAM_NAME, taskId: TASK_ID }),
+        ),
+      );
+      await flushMicrotasks();
+      await flushMicrotasks();
+    });
+
+    const text = host.textContent ?? '';
+    expect(text).toContain('Task Log Stream');
+    expect(text).toContain('Grep');
+    expect(text).toContain('Edit');
+    expect(text).toContain('Claude');
+    expect(text).toContain('2 tool calls');
+    expect(text).toContain('Audit complete');
+    expect(text).not.toContain('[]');
+    expect(text).not.toContain('lead session');
+
+    await act(async () => {
+      root.unmount();
+      await flushMicrotasks();
+    });
+  });
+
+  it('does not render empty board lifecycle payload blocks for task_start/task_complete', async () => {
+    vi.stubGlobal('IS_REACT_ACT_ENVIRONMENT', true);
+
+    const dir = await mkdtemp(path.join(tmpdir(), 'task-log-stream-board-lifecycle-'));
+    tempDirs.push(dir);
+    const transcriptPath = path.join(dir, 'session.jsonl');
+
+    const lines = [
+      createAssistantEntry({
+        uuid: 'a-start',
+        timestamp: '2026-04-12T18:25:04.000Z',
+        requestId: 'req-start',
+        content: [
+          {
+            type: 'tool_use',
+            id: 'call-start',
+            name: 'mcp__agent-teams__task_start',
+            input: {
+              teamName: TEAM_NAME,
+              taskId: TASK_ID,
+            },
+          },
+        ],
+      }),
+      createUserEntry({
+        uuid: 'u-start',
+        timestamp: '2026-04-12T18:25:04.039Z',
+        sourceToolAssistantUUID: 'a-start',
+        content: [
+          {
+            type: 'tool_result',
+            tool_use_id: 'call-start',
+            content: '',
+          },
+        ],
+        boardTaskLinks: [
+          {
+            schemaVersion: 1,
+            toolUseId: 'call-start',
+            task: {
+              ref: TASK_ID,
+              refKind: 'canonical',
+              canonicalId: TASK_ID,
+            },
+            targetRole: 'subject',
+            linkKind: 'lifecycle',
+            taskArgumentSlot: 'taskId',
+            actorContext: {
+              relation: 'idle',
+            },
+          },
+        ],
+        boardTaskToolActions: [
+          {
+            schemaVersion: 1,
+            toolUseId: 'call-start',
+            canonicalToolName: 'task_start',
+          },
+        ],
+        toolUseResult: {
+          toolUseId: 'call-start',
+          content: '',
+        },
+      }),
+      createAssistantEntry({
+        uuid: 'a-complete',
+        timestamp: '2026-04-12T18:27:04.000Z',
+        requestId: 'req-complete',
+        content: [
+          {
+            type: 'tool_use',
+            id: 'call-complete',
+            name: 'mcp__agent-teams__task_complete',
+            input: {
+              teamName: TEAM_NAME,
+              taskId: TASK_ID,
+            },
+          },
+        ],
+      }),
+      createUserEntry({
+        uuid: 'u-complete',
+        timestamp: '2026-04-12T18:27:04.039Z',
+        sourceToolAssistantUUID: 'a-complete',
+        content: [
+          {
+            type: 'tool_result',
+            tool_use_id: 'call-complete',
+            content: '',
+          },
+        ],
+        boardTaskLinks: [
+          {
+            schemaVersion: 1,
+            toolUseId: 'call-complete',
+            task: {
+              ref: TASK_ID,
+              refKind: 'canonical',
+              canonicalId: TASK_ID,
+            },
+            targetRole: 'subject',
+            linkKind: 'lifecycle',
+            taskArgumentSlot: 'taskId',
+            actorContext: {
+              relation: 'same_task',
+            },
+          },
+        ],
+        boardTaskToolActions: [
+          {
+            schemaVersion: 1,
+            toolUseId: 'call-complete',
+            canonicalToolName: 'task_complete',
+          },
+        ],
+        toolUseResult: {
+          toolUseId: 'call-complete',
+          content: '',
+        },
+      }),
+    ];
+
+    await writeFile(
+      transcriptPath,
+      `${lines.map((line) => JSON.stringify(line)).join('\n')}\n`,
+      'utf8',
+    );
+
+    apiState.getTaskLogStream.mockResolvedValueOnce(await buildStreamResponse(transcriptPath));
+
+    const host = document.createElement('div');
+    document.body.appendChild(host);
+    const root = createRoot(host);
+
+    await act(async () => {
+      root.render(
+        React.createElement(
+          TooltipProvider,
+          null,
+          React.createElement(TaskLogStreamSection, { teamName: TEAM_NAME, taskId: TASK_ID }),
+        ),
+      );
+      await flushMicrotasks();
+      await flushMicrotasks();
+    });
+
+    const text = host.textContent ?? '';
+    expect(text).toContain('Task Log Stream');
+    expect(text).toContain('mcp__agent-teams__task_start');
+    expect(text).toContain('mcp__agent-teams__task_complete');
+    expect(text).not.toContain('[]');
+
+    await act(async () => {
+      root.unmount();
+      await flushMicrotasks();
+    });
+  });
+});

test/renderer/components/team/taskLogs/TaskLogStreamSection.live.test.ts

@@ -0,0 +1,107 @@
+import * as os from 'os';
+import * as path from 'path';
+
+import React, { act } from 'react';
+import { createRoot } from 'react-dom/client';
+import { afterAll, afterEach, beforeAll, describe, expect, it, vi } from 'vitest';
+
+import { BoardTaskLogDiagnosticsService } from '../../../../../src/main/services/team/taskLogs/diagnostics/BoardTaskLogDiagnosticsService';
+import { BoardTaskLogStreamService } from '../../../../../src/main/services/team/taskLogs/stream/BoardTaskLogStreamService';
+import { TooltipProvider } from '../../../../../src/renderer/components/ui/tooltip';
+import { setClaudeBasePathOverride } from '../../../../../src/main/utils/pathDecoder';
+
+const LIVE_TEAM = process.env.LIVE_TASK_LOG_TEAM?.trim();
+const LIVE_TASK = process.env.LIVE_TASK_LOG_TASK?.trim();
+const LIVE_CLAUDE_BASE =
+  process.env.LIVE_TASK_LOG_CLAUDE_BASE?.trim() || path.join(os.homedir(), '.claude');
+const EXPECT_NO_EMPTY_PAYLOADS =
+  process.env.LIVE_TASK_LOG_EXPECT_NO_EMPTY_PAYLOADS === '1';
+const EXPECT_VISIBLE_TOOLS = (process.env.LIVE_TASK_LOG_EXPECT_VISIBLE_TOOLS ?? '')
+  .split(',')
+  .map((value) => value.trim())
+  .filter(Boolean);
+
+const describeLive =
+  LIVE_TEAM && LIVE_TASK && LIVE_CLAUDE_BASE ? describe : describe.skip;
+
+const apiState = {
+  getTaskLogStream: vi.fn(),
+};
+
+vi.mock('@renderer/api', () => ({
+  api: {
+    teams: {
+      getTaskLogStream: (...args: Parameters<typeof apiState.getTaskLogStream>) =>
+        apiState.getTaskLogStream(...args),
+    },
+  },
+}));
+
+import { TaskLogStreamSection } from '@renderer/components/team/taskLogs/TaskLogStreamSection';
+
+function flushMicrotasks(): Promise<void> {
+  return Promise.resolve();
+}
+
+describeLive('TaskLogStreamSection live smoke', () => {
+  beforeAll(() => {
+    setClaudeBasePathOverride(LIVE_CLAUDE_BASE);
+  });
+
+  afterAll(() => {
+    setClaudeBasePathOverride(null);
+  });
+
+  afterEach(() => {
+    document.body.innerHTML = '';
+    apiState.getTaskLogStream.mockReset();
+    vi.unstubAllGlobals();
+  });
+
+  it('renders the current live task log stream without empty payload placeholders', async () => {
+    vi.stubGlobal('IS_REACT_ACT_ENVIRONMENT', true);
+
+    const diagnosticsService = new BoardTaskLogDiagnosticsService();
+    const streamService = new BoardTaskLogStreamService();
+    const report = await diagnosticsService.diagnose(LIVE_TEAM!, LIVE_TASK!);
+    const stream = await streamService.getTaskLogStream(LIVE_TEAM!, report.task.taskId);
+
+    apiState.getTaskLogStream.mockResolvedValueOnce(stream);
+
+    const host = document.createElement('div');
+    document.body.appendChild(host);
+    const root = createRoot(host);
+
+    await act(async () => {
+      root.render(
+        React.createElement(
+          TooltipProvider,
+          null,
+          React.createElement(TaskLogStreamSection, {
+            teamName: LIVE_TEAM!,
+            taskId: report.task.taskId,
+          }),
+        ),
+      );
+      await flushMicrotasks();
+      await flushMicrotasks();
+    });
+
+    expect(host.textContent).toContain('Task Log Stream');
+    expect(host.textContent).not.toContain('Loading task log stream');
+    expect(host.textContent).not.toContain('[]');
+
+    if (EXPECT_NO_EMPTY_PAYLOADS) {
+      expect(report.stream.emptyPayloadExamples).toHaveLength(0);
+    }
+
+    for (const toolName of EXPECT_VISIBLE_TOOLS) {
+      expect(host.textContent).toContain(toolName);
+    }
+
+    await act(async () => {
+      root.unmount();
+      await flushMicrotasks();
+    });
+  });
+});

test/renderer/components/team/taskLogs/TaskLogStreamSection.test.ts

@@ -0,0 +1,223 @@
+import React, { act } from 'react';
+import { createRoot } from 'react-dom/client';
+import { afterEach, describe, expect, it, vi } from 'vitest';
+
+import type { BoardTaskLogStreamResponse } from '../../../../../src/shared/types';
+
+const apiState = {
+  getTaskLogStream: vi.fn<
+    (teamName: string, taskId: string) => Promise<BoardTaskLogStreamResponse>
+  >(),
+};
+
+vi.mock('@renderer/api', () => ({
+  api: {
+    teams: {
+      getTaskLogStream: (...args: Parameters<typeof apiState.getTaskLogStream>) =>
+        apiState.getTaskLogStream(...args),
+    },
+  },
+}));
+
+vi.mock('@renderer/components/team/members/MemberExecutionLog', () => ({
+  MemberExecutionLog: ({
+    memberName,
+    chunks,
+  }: {
+    memberName?: string;
+    chunks: { id: string }[];
+  }) =>
+    React.createElement(
+      'div',
+      { 'data-testid': 'member-execution-log' },
+      `${memberName ?? 'lead'}:${chunks.length}`
+    ),
+}));
+
+import { TaskLogStreamSection } from '@renderer/components/team/taskLogs/TaskLogStreamSection';
+
+function flushMicrotasks(): Promise<void> {
+  return Promise.resolve();
+}
+
+describe('TaskLogStreamSection', () => {
+  afterEach(() => {
+    document.body.innerHTML = '';
+    apiState.getTaskLogStream.mockReset();
+    vi.unstubAllGlobals();
+  });
+
+  it('renders empty state when the stream is absent', async () => {
+    vi.stubGlobal('IS_REACT_ACT_ENVIRONMENT', true);
+    apiState.getTaskLogStream.mockResolvedValueOnce({
+      participants: [],
+      defaultFilter: 'all',
+      segments: [],
+    });
+
+    const host = document.createElement('div');
+    document.body.appendChild(host);
+    const root = createRoot(host);
+
+    await act(async () => {
+      root.render(React.createElement(TaskLogStreamSection, { teamName: 'demo', taskId: 'task-a' }));
+      await flushMicrotasks();
+    });
+
+    expect(host.textContent).toContain('Task Log Stream');
+    expect(host.textContent).toContain('No task log stream yet');
+
+    await act(async () => {
+      root.unmount();
+      await flushMicrotasks();
+    });
+  });
+
+  it('shows participant chips and filters the visible segments', async () => {
+    vi.stubGlobal('IS_REACT_ACT_ENVIRONMENT', true);
+    apiState.getTaskLogStream.mockResolvedValueOnce({
+      participants: [
+        {
+          key: 'member:tom',
+          label: 'tom',
+          role: 'member',
+          isLead: false,
+          isSidechain: true,
+        },
+        {
+          key: 'member:alice',
+          label: 'alice',
+          role: 'member',
+          isLead: false,
+          isSidechain: true,
+        },
+      ],
+      defaultFilter: 'all',
+      segments: [
+        {
+          id: 'segment-tom-1',
+          participantKey: 'member:tom',
+          actor: {
+            memberName: 'tom',
+            role: 'member',
+            sessionId: 'session-tom-1',
+            agentId: 'agent-tom',
+            isSidechain: true,
+          },
+          startTimestamp: '2026-04-12T16:00:00.000Z',
+          endTimestamp: '2026-04-12T16:01:00.000Z',
+          chunks: [{ id: 'chunk-tom-1', chunkType: 'user', rawMessages: [] }] as never,
+        },
+        {
+          id: 'segment-alice-1',
+          participantKey: 'member:alice',
+          actor: {
+            memberName: 'alice',
+            role: 'member',
+            sessionId: 'session-alice-1',
+            agentId: 'agent-alice',
+            isSidechain: true,
+          },
+          startTimestamp: '2026-04-12T16:02:00.000Z',
+          endTimestamp: '2026-04-12T16:03:00.000Z',
+          chunks: [{ id: 'chunk-alice-1', chunkType: 'user', rawMessages: [] }] as never,
+        },
+        {
+          id: 'segment-tom-2',
+          participantKey: 'member:tom',
+          actor: {
+            memberName: 'tom',
+            role: 'member',
+            sessionId: 'session-tom-2',
+            agentId: 'agent-tom',
+            isSidechain: true,
+          },
+          startTimestamp: '2026-04-12T16:04:00.000Z',
+          endTimestamp: '2026-04-12T16:05:00.000Z',
+          chunks: [{ id: 'chunk-tom-2', chunkType: 'user', rawMessages: [] }] as never,
+        },
+      ],
+    });
+
+    const host = document.createElement('div');
+    document.body.appendChild(host);
+    const root = createRoot(host);
+
+    await act(async () => {
+      root.render(React.createElement(TaskLogStreamSection, { teamName: 'demo', taskId: 'task-a' }));
+      await flushMicrotasks();
+    });
+
+    expect(host.textContent).toContain('All');
+    expect(host.textContent).toContain('tom');
+    expect(host.textContent).toContain('alice');
+    expect(host.querySelectorAll('[data-testid="member-execution-log"]')).toHaveLength(3);
+
+    const buttons = [...host.querySelectorAll('button')];
+    const tomButton = buttons.find((button) => button.textContent?.trim() === 'tom');
+    expect(tomButton).toBeDefined();
+
+    await act(async () => {
+      tomButton?.dispatchEvent(new MouseEvent('click', { bubbles: true }));
+      await flushMicrotasks();
+    });
+
+    const logs = [...host.querySelectorAll('[data-testid="member-execution-log"]')].map(
+      (node) => node.textContent
+    );
+    expect(logs).toEqual(['tom:1', 'tom:1']);
+
+    await act(async () => {
+      root.unmount();
+      await flushMicrotasks();
+    });
+  });
+
+  it('honors a participant default filter from the stream response', async () => {
+    vi.stubGlobal('IS_REACT_ACT_ENVIRONMENT', true);
+    apiState.getTaskLogStream.mockResolvedValueOnce({
+      participants: [
+        {
+          key: 'member:tom',
+          label: 'tom',
+          role: 'member',
+          isLead: false,
+          isSidechain: false,
+        },
+      ],
+      defaultFilter: 'member:tom',
+      segments: [
+        {
+          id: 'segment-tom-1',
+          participantKey: 'member:tom',
+          actor: {
+            memberName: 'tom',
+            role: 'lead',
+            sessionId: 'session-tom-1',
+            isSidechain: false,
+          },
+          startTimestamp: '2026-04-12T16:00:00.000Z',
+          endTimestamp: '2026-04-12T16:01:00.000Z',
+          chunks: [{ id: 'chunk-tom-1', chunkType: 'ai', rawMessages: [] }] as never,
+        },
+      ],
+    });
+
+    const host = document.createElement('div');
+    document.body.appendChild(host);
+    const root = createRoot(host);
+
+    await act(async () => {
+      root.render(React.createElement(TaskLogStreamSection, { teamName: 'demo', taskId: 'task-a' }));
+      await flushMicrotasks();
+    });
+
+    expect(host.querySelectorAll('[data-testid="member-execution-log"]')).toHaveLength(1);
+    expect(host.textContent).toContain('tom:1');
+
+    await act(async () => {
+      root.unmount();
+      await flushMicrotasks();
+    });
+  });
+});