diff --git a/src/main/index.ts b/src/main/index.ts
index e7aae28b..1bf686f0 100644
--- a/src/main/index.ts
+++ b/src/main/index.ts
@@ -138,6 +138,7 @@ import {
 } from './services/team/TeamControlApiState';
 import { TeamInboxReader } from './services/team/TeamInboxReader';
 import { getTeamDataWorkerClient } from './services/team/TeamDataWorkerClient';
+import { getTeamFsWorkerClient } from './services/team/TeamFsWorkerClient';
 import { TeamMemberRuntimeAdvisoryService } from './services/team/TeamMemberRuntimeAdvisoryService';
 import {
   createTeamReconcileDrainScheduler,
@@ -1841,6 +1842,30 @@ function createWindow(): void {
         updaterService.startPeriodicCheck(60 * 60 * 1000);
       }
 
+      scheduleStartupTask(
+        () => {
+          void getTeamFsWorkerClient()
+            .prewarm()
+            .catch((error: unknown) =>
+              logger.debug(
+                `[startup] team-fs-worker prewarm skipped: ${
+                  error instanceof Error ? error.message : String(error)
+                }`
+              )
+            );
+          void getTeamDataWorkerClient()
+            .prewarm()
+            .catch((error: unknown) =>
+              logger.debug(
+                `[startup] team-data-worker prewarm skipped: ${
+                  error instanceof Error ? error.message : String(error)
+                }`
+              )
+            );
+        },
+        process.platform === 'win32' ? 2500 : 1000
+      );
+
       // Defer non-critical startup work to avoid thread pool contention.
       // The window is now visible and responsive; these run in the background.
       scheduleStartupTask(() => {
diff --git a/src/main/services/team/TeamDataWorkerClient.ts b/src/main/services/team/TeamDataWorkerClient.ts
index f53259a5..ed7398a7 100644
--- a/src/main/services/team/TeamDataWorkerClient.ts
+++ b/src/main/services/team/TeamDataWorkerClient.ts
@@ -66,6 +66,9 @@ interface PendingEntry {
 function summarizeWorkerPayload(
   payload: TeamDataWorkerRequest['payload']
 ): Record<string, unknown> {
+  if (!payload) {
+    return {};
+  }
   if ('taskId' in payload) {
     return {
       teamName: payload.teamName,
@@ -213,6 +216,21 @@ export class TeamDataWorkerClient {
     });
   }
 
+  async prewarm(): Promise<void> {
+    if (this.worker) {
+      return;
+    }
+    if (!this.isAvailable()) {
+      return;
+    }
+    const startedAt = Date.now();
+    await this.call('warmup', {});
+    const ms = Date.now() - startedAt;
+    if (ms >= 1500) {
+      logger.warn(`worker prewarm slow ms=${ms}`);
+    }
+  }
+
   private postBestEffort(
     op: TeamDataWorkerRequest['op'],
     payload: TeamDataWorkerRequest['payload']
diff --git a/src/main/services/team/TeamFsWorkerClient.ts b/src/main/services/team/TeamFsWorkerClient.ts
index f2089afd..f9991efb 100644
--- a/src/main/services/team/TeamFsWorkerClient.ts
+++ b/src/main/services/team/TeamFsWorkerClient.ts
@@ -36,6 +36,7 @@ interface GetAllTasksPayload {
 }
 
 type WorkerRequest =
+  | { id: string; op: 'warmup'; payload?: Record<string, never> }
   | { id: string; op: 'listTeams'; payload: ListTeamsPayload }
   | { id: string; op: 'getAllTasks'; payload: GetAllTasksPayload };
 
@@ -44,6 +45,9 @@ type WorkerResponse =
   | { id: string; ok: false; error: string };
 
 function summarizeWorkerPayload(payload: WorkerRequest['payload']): Record<string, unknown> {
+  if (!payload) {
+    return {};
+  }
   if ('teamsDir' in payload) {
     return {
       teamsDir: payload.teamsDir,
@@ -52,6 +56,9 @@ function summarizeWorkerPayload(payload: WorkerRequest['payload']): Record<strin
       maxConfigBytes: payload.maxConfigBytes,
     };
   }
+  if (!('tasksBase' in payload)) {
+    return {};
+  }
   return {
     tasksBase: payload.tasksBase,
     concurrency: payload.concurrency,
@@ -108,6 +115,18 @@ export class TeamFsWorkerClient {
     { resolve: (v: { result: unknown; diag?: WorkerDiag }) => void; reject: (e: Error) => void }
   >();
 
+  private failWorker(worker: Worker, error: Error): void {
+    if (this.worker !== worker) return;
+
+    this.worker = null;
+    const pendingEntries = Array.from(this.pending.values());
+    this.pending.clear();
+
+    for (const entry of pendingEntries) {
+      entry.reject(error);
+    }
+  }
+
   isAvailable(): boolean {
     if (!this.workerPath && !this.warnedUnavailable && shouldWarnUnavailableWorker()) {
       this.warnedUnavailable = true;
@@ -134,8 +153,9 @@ export class TeamFsWorkerClient {
       return this.worker;
     }
 
-    this.worker = new Worker(this.workerPath);
-    this.worker.on('message', (msg: WorkerResponse) => {
+    const worker = new Worker(this.workerPath);
+    this.worker = worker;
+    worker.on('message', (msg: WorkerResponse) => {
       const entry = this.pending.get(msg.id);
       if (!entry) return;
       this.pending.delete(msg.id);
@@ -145,26 +165,18 @@ export class TeamFsWorkerClient {
         entry.reject(new Error(msg.error));
       }
     });
-    this.worker.on('error', (err) => {
+    worker.on('error', (err) => {
       logger.error('Worker error', err);
-      for (const [, entry] of this.pending) {
-        entry.reject(err instanceof Error ? err : new Error(String(err)));
-      }
-      this.pending.clear();
-      this.worker = null;
+      this.failWorker(worker, err instanceof Error ? err : new Error(String(err)));
     });
-    this.worker.on('exit', (code) => {
+    worker.on('exit', (code) => {
       if (code !== 0) {
         logger.warn(`Worker exited with code ${code}`);
       }
-      for (const [, entry] of this.pending) {
-        entry.reject(new Error(`Worker exited with code ${code}`));
-      }
-      this.pending.clear();
-      this.worker = null;
+      this.failWorker(worker, new Error(`Worker exited with code ${code}`));
     });
 
-    return this.worker;
+    return worker;
   }
 
   private call(
@@ -177,21 +189,22 @@ export class TeamFsWorkerClient {
     const pendingAtStart = this.pending.size;
     return new Promise((resolve, reject) => {
       const timeout = setTimeout(() => {
-        this.pending.delete(id);
-        try {
-          // Terminate and recreate on next call — worker may be stuck in native IO.
-          this.worker?.terminate().catch(() => undefined);
-        } catch {
-          // ignore
-        } finally {
-          this.worker = null;
-        }
+        const timeoutError = new Error(
+          `Worker call timeout after ${WORKER_CALL_TIMEOUT_MS}ms (${op})`
+        );
         logger.warn(
           `worker call timeout op=${op} ms=${Date.now() - startedAt} pendingAtStart=${pendingAtStart} pendingNow=${this.pending.size} payload=${JSON.stringify(
             summarizeWorkerPayload(payload)
           )}`
         );
-        reject(new Error(`Worker call timeout after ${WORKER_CALL_TIMEOUT_MS}ms (${op})`));
+        this.failWorker(worker, timeoutError);
+        try {
+          // Terminate and recreate on next call - worker may be stuck in native IO.
+          worker.terminate().catch(() => undefined);
+        } catch {
+          // ignore
+        }
+        reject(timeoutError);
       }, WORKER_CALL_TIMEOUT_MS);
 
       this.pending.set(id, {
@@ -224,6 +237,21 @@ export class TeamFsWorkerClient {
     });
   }
 
+  async prewarm(): Promise<void> {
+    if (this.worker) {
+      return;
+    }
+    if (!this.isAvailable()) {
+      return;
+    }
+    const startedAt = Date.now();
+    await this.call('warmup', {});
+    const ms = Date.now() - startedAt;
+    if (ms >= 1500) {
+      logger.warn(`worker prewarm slow ms=${ms}`);
+    }
+  }
+
   async listTeams(options: {
     largeConfigBytes: number;
     configHeadBytes: number;
diff --git a/src/main/services/team/TeamProvisioningService.ts b/src/main/services/team/TeamProvisioningService.ts
index 0aae9695..6374cb2e 100644
--- a/src/main/services/team/TeamProvisioningService.ts
+++ b/src/main/services/team/TeamProvisioningService.ts
@@ -4565,10 +4565,31 @@ export class TeamProvisioningService {
     string,
     { expiresAtMs: number; snapshot: TeamAgentRuntimeSnapshot }
   >();
+  private readonly agentRuntimeSnapshotInFlightByTeam = new Map<
+    string,
+    {
+      generationAtStart: number;
+      runIdAtStart: string | null;
+      promise: Promise<TeamAgentRuntimeSnapshot>;
+    }
+  >();
   private readonly liveTeamAgentRuntimeMetadataCache = new Map<
     string,
-    { expiresAtMs: number; metadata: Map<string, LiveTeamAgentRuntimeMetadata> }
+    {
+      expiresAtMs: number;
+      metadata: Map<string, LiveTeamAgentRuntimeMetadata>;
+      runId: string | null;
+    }
   >();
+  private readonly liveTeamAgentRuntimeMetadataInFlightByTeam = new Map<
+    string,
+    {
+      generationAtStart: number;
+      runIdAtStart: string | null;
+      promise: Promise<Map<string, LiveTeamAgentRuntimeMetadata>>;
+    }
+  >();
+  private readonly runtimeSnapshotCacheGenerationByTeam = new Map<string, number>();
   private readonly launchStateStore = new TeamLaunchStateStore();
   private readonly launchStateStoreQueue = new Map<string, Promise<unknown>>();
   private readonly memberLogsFinder: TeamMemberLogsFinder;
@@ -4651,6 +4672,35 @@ export class TeamProvisioningService {
     return { config, teamMeta, metaMembers };
   }
 
+  private getRuntimeSnapshotCacheGeneration(teamName: string): number {
+    return this.runtimeSnapshotCacheGenerationByTeam.get(teamName) ?? 0;
+  }
+
+  private invalidateRuntimeSnapshotCaches(teamName: string): void {
+    this.runtimeSnapshotCacheGenerationByTeam.set(
+      teamName,
+      this.getRuntimeSnapshotCacheGeneration(teamName) + 1
+    );
+    this.agentRuntimeSnapshotCache.delete(teamName);
+    this.agentRuntimeSnapshotInFlightByTeam.delete(teamName);
+    this.liveTeamAgentRuntimeMetadataCache.delete(teamName);
+    this.liveTeamAgentRuntimeMetadataInFlightByTeam.delete(teamName);
+  }
+
+  private cloneLiveTeamAgentRuntimeMetadata(
+    metadata: ReadonlyMap<string, LiveTeamAgentRuntimeMetadata>
+  ): Map<string, LiveTeamAgentRuntimeMetadata> {
+    return new Map(
+      [...metadata.entries()].map(([memberName, entry]) => [
+        memberName,
+        {
+          ...entry,
+          ...(entry.diagnostics ? { diagnostics: [...entry.diagnostics] } : {}),
+        },
+      ])
+    );
+  }
+
   private resolveOpenCodeMemberIdentityFromDirectory(
     teamName: string,
     memberName: string,
@@ -5463,6 +5513,7 @@ export class TeamProvisioningService {
         this.runtimeAdapterRunByTeam.delete(teamName);
         this.aliveRunByTeam.delete(teamName);
         this.provisioningRunByTeam.delete(teamName);
+        this.invalidateRuntimeSnapshotCaches(teamName);
       }
     }
     if (cleaned > 0) {
@@ -7625,6 +7676,7 @@ export class TeamProvisioningService {
 
   private resetTeamScopedTransientStateForNewRun(teamName: string): void {
     peekAutoResumeService()?.cancelPendingAutoResume(teamName);
+    this.invalidateRuntimeSnapshotCaches(teamName);
     this.retainedClaudeLogsByTeam.delete(teamName);
     this.persistedTranscriptClaudeLogsCache.delete(teamName);
     this.leadInboxRelayInFlight.delete(teamName);
@@ -9070,8 +9122,7 @@ export class TeamProvisioningService {
         trackedUpdate.run,
         this.getMixedSecondaryLaunchPhase(trackedUpdate.run)
       );
-      this.agentRuntimeSnapshotCache.delete(input.teamName);
-      this.liveTeamAgentRuntimeMetadataCache.delete(input.teamName);
+      this.invalidateRuntimeSnapshotCaches(input.teamName);
       if (trackedUpdate.changed) {
         this.teamChangeEmitter?.({
           type: 'member-spawn',
@@ -9158,8 +9209,7 @@ export class TeamProvisioningService {
       updatedAt: input.observedAt,
     });
     await this.writeLaunchStateSnapshot(input.teamName, snapshot);
-    this.agentRuntimeSnapshotCache.delete(input.teamName);
-    this.liveTeamAgentRuntimeMetadataCache.delete(input.teamName);
+    this.invalidateRuntimeSnapshotCaches(input.teamName);
     if (shouldEmitMemberSpawnChange) {
       this.teamChangeEmitter?.({
         type: 'member-spawn',
@@ -9936,8 +9986,7 @@ export class TeamProvisioningService {
               );
               return;
             }
-            this.agentRuntimeSnapshotCache.delete(run.teamName);
-            this.liveTeamAgentRuntimeMetadataCache.delete(run.teamName);
+            this.invalidateRuntimeSnapshotCaches(run.teamName);
             this.setMemberSpawnStatus(run, spawnedMemberName, 'waiting');
             this.appendMemberBootstrapDiagnostic(
               run,
@@ -10405,6 +10454,36 @@ export class TeamProvisioningService {
       return cached.snapshot;
     }
 
+    const generationAtStart = this.getRuntimeSnapshotCacheGeneration(teamName);
+    const existingRequest = this.agentRuntimeSnapshotInFlightByTeam.get(teamName);
+    if (
+      existingRequest &&
+      existingRequest.generationAtStart === generationAtStart &&
+      existingRequest.runIdAtStart === runId
+    ) {
+      return existingRequest.promise;
+    }
+
+    const request = this.buildTeamAgentRuntimeSnapshot(teamName, runId, generationAtStart).finally(
+      () => {
+        if (this.agentRuntimeSnapshotInFlightByTeam.get(teamName)?.promise === request) {
+          this.agentRuntimeSnapshotInFlightByTeam.delete(teamName);
+        }
+      }
+    );
+    this.agentRuntimeSnapshotInFlightByTeam.set(teamName, {
+      generationAtStart,
+      runIdAtStart: runId,
+      promise: request,
+    });
+    return request;
+  }
+
+  private async buildTeamAgentRuntimeSnapshot(
+    teamName: string,
+    runId: string | null,
+    generationAtStart: number
+  ): Promise<TeamAgentRuntimeSnapshot> {
     const updatedAt = nowIso();
     const run = runId ? (this.runs.get(runId) ?? null) : null;
     const currentRuntimeAdapterRun = this.runtimeAdapterRunByTeam.get(teamName);
@@ -10627,10 +10706,15 @@ export class TeamProvisioningService {
       members: snapshotMembers,
     };
 
-    this.agentRuntimeSnapshotCache.set(teamName, {
-      expiresAtMs: Date.now() + TeamProvisioningService.AGENT_RUNTIME_SNAPSHOT_CACHE_TTL_MS,
-      snapshot,
-    });
+    if (
+      this.getRuntimeSnapshotCacheGeneration(teamName) === generationAtStart &&
+      this.getTrackedRunId(teamName) === runId
+    ) {
+      this.agentRuntimeSnapshotCache.set(teamName, {
+        expiresAtMs: Date.now() + TeamProvisioningService.AGENT_RUNTIME_SNAPSHOT_CACHE_TTL_MS,
+        snapshot,
+      });
+    }
     return snapshot;
   }
 
@@ -11004,8 +11088,7 @@ export class TeamProvisioningService {
       );
     }
 
-    this.agentRuntimeSnapshotCache.delete(teamName);
-    this.liveTeamAgentRuntimeMetadataCache.delete(teamName);
+    this.invalidateRuntimeSnapshotCaches(teamName);
     const liveRuntimeByMember = await this.getLiveTeamAgentRuntimeMetadata(teamName);
     const livePids = new Set<number>();
     let hasAliveRuntimeWithoutPid = false;
@@ -11150,8 +11233,7 @@ export class TeamProvisioningService {
       throw new Error('Lead restart is not supported from member controls');
     }
 
-    this.agentRuntimeSnapshotCache.delete(teamName);
-    this.liveTeamAgentRuntimeMetadataCache.delete(teamName);
+    this.invalidateRuntimeSnapshotCaches(teamName);
     this.resetRuntimeToolActivity(run, memberName);
     this.clearMemberSpawnToolTracking(run, memberName);
     this.setMemberSpawnStatus(run, memberName, 'spawning');
@@ -11311,8 +11393,7 @@ export class TeamProvisioningService {
       : 'Skipped by user for this launch';
 
     if (run && !run.processKilled && !run.cancelRequested) {
-      this.agentRuntimeSnapshotCache.delete(teamName);
-      this.liveTeamAgentRuntimeMetadataCache.delete(teamName);
+      this.invalidateRuntimeSnapshotCaches(teamName);
       this.resetRuntimeToolActivity(run, normalizedMemberName);
       this.clearMemberSpawnToolTracking(run, normalizedMemberName);
       this.setMemberSpawnStatus(run, normalizedMemberName, 'skipped', reason);
@@ -11374,8 +11455,7 @@ export class TeamProvisioningService {
       updatedAt,
     });
     await this.writeLaunchStateSnapshot(teamName, nextSnapshot);
-    this.agentRuntimeSnapshotCache.delete(teamName);
-    this.liveTeamAgentRuntimeMetadataCache.delete(teamName);
+    this.invalidateRuntimeSnapshotCaches(teamName);
   }
 
   private getMutableAliveRunOrThrow(teamName: string): ProvisioningRun {
@@ -11489,8 +11569,7 @@ export class TeamProvisioningService {
     }
 
     this.upsertRunAllEffectiveMember(run, memberSpec);
-    this.agentRuntimeSnapshotCache.delete(teamName);
-    this.liveTeamAgentRuntimeMetadataCache.delete(teamName);
+    this.invalidateRuntimeSnapshotCaches(teamName);
     this.resetRuntimeToolActivity(run, memberName);
     this.clearMemberSpawnToolTracking(run, memberName);
     run.pendingMemberRestarts.delete(memberName);
@@ -11544,8 +11623,7 @@ export class TeamProvisioningService {
     );
     if (laneIndex < 0) {
       this.removeRunAllEffectiveMember(run, memberName);
-      this.agentRuntimeSnapshotCache.delete(teamName);
-      this.liveTeamAgentRuntimeMetadataCache.delete(teamName);
+      this.invalidateRuntimeSnapshotCaches(teamName);
       await this.persistLaunchStateSnapshot(run, this.getMixedSecondaryLaunchPhase(run));
       return;
     }
@@ -11553,8 +11631,7 @@ export class TeamProvisioningService {
     const [lane] = run.mixedSecondaryLanes.splice(laneIndex, 1);
     await this.stopSingleMixedSecondaryRuntimeLane(run, lane, 'cleanup');
     this.removeRunAllEffectiveMember(run, memberName);
-    this.agentRuntimeSnapshotCache.delete(teamName);
-    this.liveTeamAgentRuntimeMetadataCache.delete(teamName);
+    this.invalidateRuntimeSnapshotCaches(teamName);
     this.resetRuntimeToolActivity(run, memberName);
     this.clearMemberSpawnToolTracking(run, memberName);
     run.pendingMemberRestarts.delete(memberName);
@@ -14429,6 +14506,7 @@ export class TeamProvisioningService {
         }).catch(() => undefined);
         this.runtimeAdapterRunByTeam.delete(input.request.teamName);
         this.aliveRunByTeam.delete(input.request.teamName);
+        this.invalidateRuntimeSnapshotCaches(input.request.teamName);
       } else {
         this.runtimeAdapterRunByTeam.set(input.request.teamName, {
           runId,
@@ -14437,6 +14515,7 @@ export class TeamProvisioningService {
           members: result.members,
         });
         this.aliveRunByTeam.set(input.request.teamName, runId);
+        this.invalidateRuntimeSnapshotCaches(input.request.teamName);
       }
       if (this.provisioningRunByTeam.get(input.request.teamName) === runId) {
         this.provisioningRunByTeam.delete(input.request.teamName);
@@ -15399,6 +15478,7 @@ export class TeamProvisioningService {
     if (this.provisioningRunByTeam.get(teamName) === runId) {
       this.provisioningRunByTeam.delete(teamName);
     }
+    this.invalidateRuntimeSnapshotCaches(teamName);
     this.setRuntimeAdapterProgress({
       ...runtimeProgress,
       state: 'cancelled',
@@ -15478,6 +15558,7 @@ export class TeamProvisioningService {
     if (this.provisioningRunByTeam.get(teamName) === runId) {
       this.provisioningRunByTeam.delete(teamName);
     }
+    this.invalidateRuntimeSnapshotCaches(teamName);
   }
 
   private recordCancelledOpenCodeRuntimeAdapterLaunch(
@@ -15490,6 +15571,7 @@ export class TeamProvisioningService {
     this.provisioningRunByTeam.delete(teamName);
     this.runtimeAdapterRunByTeam.delete(teamName);
     this.aliveRunByTeam.delete(teamName);
+    this.invalidateRuntimeSnapshotCaches(teamName);
     const progress: TeamProvisioningProgress = {
       runId,
       teamName,
@@ -17519,12 +17601,44 @@ export class TeamProvisioningService {
   private async getLiveTeamAgentRuntimeMetadata(
     teamName: string
   ): Promise<Map<string, LiveTeamAgentRuntimeMetadata>> {
+    const runId = this.getTrackedRunId(teamName);
     const cached = this.liveTeamAgentRuntimeMetadataCache.get(teamName);
-    if (cached && cached.expiresAtMs > Date.now()) {
-      return cached.metadata;
+    if (cached && cached.expiresAtMs > Date.now() && cached.runId === runId) {
+      return this.cloneLiveTeamAgentRuntimeMetadata(cached.metadata);
     }
 
-    const runId = this.getTrackedRunId(teamName);
+    const generationAtStart = this.getRuntimeSnapshotCacheGeneration(teamName);
+    const existingRequest = this.liveTeamAgentRuntimeMetadataInFlightByTeam.get(teamName);
+    if (
+      existingRequest &&
+      existingRequest.generationAtStart === generationAtStart &&
+      existingRequest.runIdAtStart === runId
+    ) {
+      return this.cloneLiveTeamAgentRuntimeMetadata(await existingRequest.promise);
+    }
+
+    const request = this.buildLiveTeamAgentRuntimeMetadata(
+      teamName,
+      runId,
+      generationAtStart
+    ).finally(() => {
+      if (this.liveTeamAgentRuntimeMetadataInFlightByTeam.get(teamName)?.promise === request) {
+        this.liveTeamAgentRuntimeMetadataInFlightByTeam.delete(teamName);
+      }
+    });
+    this.liveTeamAgentRuntimeMetadataInFlightByTeam.set(teamName, {
+      generationAtStart,
+      runIdAtStart: runId,
+      promise: request,
+    });
+    return this.cloneLiveTeamAgentRuntimeMetadata(await request);
+  }
+
+  private async buildLiveTeamAgentRuntimeMetadata(
+    teamName: string,
+    runId: string | null,
+    generationAtStart: number
+  ): Promise<Map<string, LiveTeamAgentRuntimeMetadata>> {
     const run = runId ? (this.runs.get(runId) ?? null) : null;
 
     let configuredMembers: TeamConfig['members'] = [];
@@ -17865,10 +17979,16 @@ export class TeamProvisioningService {
       });
     }
 
-    this.liveTeamAgentRuntimeMetadataCache.set(teamName, {
-      expiresAtMs: Date.now() + TeamProvisioningService.AGENT_RUNTIME_SNAPSHOT_CACHE_TTL_MS,
-      metadata: metadataByMember,
-    });
+    if (
+      this.getRuntimeSnapshotCacheGeneration(teamName) === generationAtStart &&
+      this.getTrackedRunId(teamName) === runId
+    ) {
+      this.liveTeamAgentRuntimeMetadataCache.set(teamName, {
+        expiresAtMs: Date.now() + TeamProvisioningService.AGENT_RUNTIME_SNAPSHOT_CACHE_TTL_MS,
+        metadata: this.cloneLiveTeamAgentRuntimeMetadata(metadataByMember),
+        runId,
+      });
+    }
     return metadataByMember;
   }
 
@@ -18884,14 +19004,12 @@ export class TeamProvisioningService {
 
     if (filteredSnapshot.teamLaunchState === 'clean_success' && launchPhase !== 'active') {
       await this.clearPersistedLaunchStateNow(run.teamName);
-      this.agentRuntimeSnapshotCache.delete(run.teamName);
-      this.liveTeamAgentRuntimeMetadataCache.delete(run.teamName);
+      this.invalidateRuntimeSnapshotCaches(run.teamName);
       return null;
     }
 
     const writtenSnapshot = await this.writeLaunchStateSnapshotNow(run.teamName, filteredSnapshot);
-    this.agentRuntimeSnapshotCache.delete(run.teamName);
-    this.liveTeamAgentRuntimeMetadataCache.delete(run.teamName);
+    this.invalidateRuntimeSnapshotCaches(run.teamName);
     return writtenSnapshot;
   }
 
@@ -20772,8 +20890,7 @@ export class TeamProvisioningService {
    * Always uses SIGKILL via killTeamProcess() to prevent CLI cleanup.
    */
   async stopTeam(teamName: string): Promise<void> {
-    this.agentRuntimeSnapshotCache.delete(teamName);
-    this.liveTeamAgentRuntimeMetadataCache.delete(teamName);
+    this.invalidateRuntimeSnapshotCaches(teamName);
     this.stopPersistentTeamMembers(teamName);
 
     const runId = this.getTrackedRunId(teamName);
@@ -21001,6 +21118,7 @@ export class TeamProvisioningService {
       this.runtimeAdapterRunByTeam.delete(teamName);
       this.aliveRunByTeam.delete(teamName);
       this.provisioningRunByTeam.delete(teamName);
+      this.invalidateRuntimeSnapshotCaches(teamName);
       return;
     }
     const startedAt = nowIso();
@@ -21019,6 +21137,7 @@ export class TeamProvisioningService {
     if (this.provisioningRunByTeam.get(teamName) === runId) {
       this.provisioningRunByTeam.delete(teamName);
     }
+    this.invalidateRuntimeSnapshotCaches(teamName);
     try {
       await clearOpenCodeRuntimeLaneStorage({
         teamsBasePath: getTeamsBasePath(),
@@ -21364,8 +21483,7 @@ export class TeamProvisioningService {
           );
           return true;
         }
-        this.agentRuntimeSnapshotCache.delete(run.teamName);
-        this.liveTeamAgentRuntimeMetadataCache.delete(run.teamName);
+        this.invalidateRuntimeSnapshotCaches(run.teamName);
         this.setMemberSpawnStatus(run, memberName, 'waiting');
         this.appendMemberBootstrapDiagnostic(
           run,
@@ -23760,8 +23878,7 @@ export class TeamProvisioningService {
       this.clearSecondaryRuntimeRuns(run.teamName);
     }
     if (!hasNewerTrackedRun) {
-      this.agentRuntimeSnapshotCache.delete(run.teamName);
-      this.liveTeamAgentRuntimeMetadataCache.delete(run.teamName);
+      this.invalidateRuntimeSnapshotCaches(run.teamName);
       this.leadInboxRelayInFlight.delete(run.teamName);
       this.relayedLeadInboxMessageIds.delete(run.teamName);
       this.pendingCrossTeamFirstReplies.delete(run.teamName);
diff --git a/src/main/services/team/teamDataWorkerTypes.ts b/src/main/services/team/teamDataWorkerTypes.ts
index 6b14860f..11a75219 100644
--- a/src/main/services/team/teamDataWorkerTypes.ts
+++ b/src/main/services/team/teamDataWorkerTypes.ts
@@ -56,6 +56,7 @@ export interface TeamDataWorkerDiag {
 // ── Request / Response ──
 
 export type TeamDataWorkerRequest =
+  | { id: string; op: 'warmup'; payload?: Record<string, never> }
   | { id: string; op: 'getTeamData'; payload: GetTeamDataPayload }
   | { id: string; op: 'getMessagesPage'; payload: GetMessagesPagePayload }
   | { id: string; op: 'getMemberActivityMeta'; payload: GetMemberActivityMetaPayload }
diff --git a/src/main/workers/team-data-worker.ts b/src/main/workers/team-data-worker.ts
index 361685c4..931f26ec 100644
--- a/src/main/workers/team-data-worker.ts
+++ b/src/main/workers/team-data-worker.ts
@@ -39,12 +39,16 @@ parentPort?.on('message', async (msg: TeamDataWorkerRequest) => {
   const startedAt = Date.now();
   const buildDiag = (): NonNullable<Extract<TeamDataWorkerResponse, { ok: true }>['diag']> => ({
     op: msg.op,
-    ...('teamName' in msg.payload ? { teamName: msg.payload.teamName } : {}),
-    ...('taskId' in msg.payload ? { taskId: msg.payload.taskId } : {}),
+    ...(msg.payload && 'teamName' in msg.payload ? { teamName: msg.payload.teamName } : {}),
+    ...(msg.payload && 'taskId' in msg.payload ? { taskId: msg.payload.taskId } : {}),
     totalMs: Date.now() - startedAt,
   });
   try {
     switch (msg.op) {
+      case 'warmup': {
+        respond({ id: msg.id, ok: true, result: null, diag: buildDiag() });
+        break;
+      }
       case 'getTeamData': {
         const result = await teamDataService.getTeamData(msg.payload.teamName);
         respond({ id: msg.id, ok: true, result, diag: buildDiag() });
diff --git a/src/main/workers/team-fs-worker.ts b/src/main/workers/team-fs-worker.ts
index aa7f3bf6..b4eb215f 100644
--- a/src/main/workers/team-fs-worker.ts
+++ b/src/main/workers/team-fs-worker.ts
@@ -33,6 +33,7 @@ interface GetAllTasksPayload {
 }
 
 type WorkerRequest =
+  | { id: string; op: 'warmup'; payload?: Record<string, never> }
   | { id: string; op: 'listTeams'; payload: ListTeamsPayload }
   | { id: string; op: 'getAllTasks'; payload: GetAllTasksPayload };
 
@@ -75,6 +76,10 @@ interface ListTeamsDiag {
   skipped: number;
   skipReasons: Record<string, number>;
   slowest: SlowEntry[];
+  cacheHits: number;
+  cacheMisses: number;
+  cacheWriteSkips: number;
+  cacheEvictions: number;
   totalMs: number;
 }
 
@@ -87,12 +92,19 @@ interface GetAllTasksDiag {
   skipped: number;
   skipReasons: Record<string, number>;
   slowestTeams: SlowEntry[];
+  cacheHits: number;
+  cacheMisses: number;
+  cacheWriteSkips: number;
+  cacheEvictions: number;
   totalMs: number;
 }
 
 interface TaskReadDiag {
   skipped: number;
   skipReasons: Record<string, number>;
+  cacheHits: number;
+  cacheMisses: number;
+  cacheWriteSkips: number;
 }
 
 const MAX_LAUNCH_STATE_BYTES = 32 * 1024;
@@ -104,6 +116,60 @@ const REVIEW_LIFECYCLE_EVENTS = new Set([
   'review_started',
 ]);
 const REVIEW_RESET_STATUSES = new Set(['in_progress', 'deleted']);
+const TEAM_SUMMARY_CACHE_MAX_ENTRIES = 1000;
+const TASK_FILE_CACHE_MAX_ENTRIES = 10000;
+const BOOTSTRAP_STATE_FILE = 'bootstrap-state.json';
+const BOOTSTRAP_JOURNAL_FILE = 'bootstrap-journal.jsonl';
+
+interface PathFingerprint {
+  exists: boolean;
+  isFile?: boolean;
+  isDirectory?: boolean;
+  highResolution?: boolean;
+  size?: string;
+  mode?: string;
+  dev?: string;
+  ino?: string;
+  mtimeNs?: string;
+  ctimeNs?: string;
+  birthtimeNs?: string;
+  mtimeMs?: number;
+  ctimeMs?: number;
+  birthtimeMs?: number;
+  errorCode?: string;
+}
+
+interface TeamSummaryCacheEntry {
+  fingerprint: string;
+  summary: Record<string, unknown>;
+  teamsDir: string;
+  optionKey: string;
+  lastUsedAt: number;
+}
+
+type CachedTaskReadResult =
+  | { task: Record<string, unknown>; skipReason?: undefined }
+  | { task?: undefined; skipReason: string };
+
+interface TaskFileCacheEntry {
+  fingerprint: string;
+  result: CachedTaskReadResult;
+  tasksBase: string;
+  lastUsedAt: number;
+}
+
+const teamSummaryCache = new Map<string, TeamSummaryCacheEntry>();
+const taskFileCache = new Map<string, TaskFileCacheEntry>();
+
+interface TeamSummaryDependencyFingerprint {
+  value: string;
+  cacheSafe: boolean;
+}
+
+interface LaunchStateSummaryRead {
+  summary: ReturnType<typeof choosePreferredLaunchStateSummary> | null;
+  cacheable: boolean;
+}
 
 // ---------------------------------------------------------------------------
 // Parsed JSON types (loose shapes from disk)
@@ -272,6 +338,319 @@ function pushSlowest(list: SlowEntry[], entry: SlowEntry, maxLen: number): void
   if (list.length > maxLen) list.length = maxLen;
 }
 
+function cloneCached<T>(value: T): T {
+  return typeof structuredClone === 'function'
+    ? structuredClone(value)
+    : (JSON.parse(JSON.stringify(value)) as T);
+}
+
+async function statPathFingerprint(filePath: string): Promise<PathFingerprint> {
+  try {
+    const stat = await fs.promises.stat(filePath, { bigint: true });
+    const mtimeNs =
+      typeof (stat as fs.BigIntStats & { mtimeNs?: bigint }).mtimeNs === 'bigint'
+        ? (stat as fs.BigIntStats & { mtimeNs: bigint }).mtimeNs
+        : undefined;
+    const ctimeNs =
+      typeof (stat as fs.BigIntStats & { ctimeNs?: bigint }).ctimeNs === 'bigint'
+        ? (stat as fs.BigIntStats & { ctimeNs: bigint }).ctimeNs
+        : undefined;
+    const birthtimeNs =
+      typeof (stat as fs.BigIntStats & { birthtimeNs?: bigint }).birthtimeNs === 'bigint'
+        ? (stat as fs.BigIntStats & { birthtimeNs: bigint }).birthtimeNs
+        : undefined;
+    return {
+      exists: true,
+      isFile: stat.isFile(),
+      isDirectory: stat.isDirectory(),
+      highResolution: typeof mtimeNs === 'bigint' && typeof ctimeNs === 'bigint',
+      size: stat.size.toString(),
+      mode: stat.mode.toString(),
+      dev: stat.dev.toString(),
+      ino: stat.ino.toString(),
+      mtimeNs: mtimeNs?.toString(),
+      ctimeNs: ctimeNs?.toString(),
+      birthtimeNs: birthtimeNs?.toString(),
+      mtimeMs: Number(stat.mtimeMs),
+      ctimeMs: Number(stat.ctimeMs),
+      birthtimeMs: Number(stat.birthtimeMs),
+    };
+  } catch (error) {
+    return {
+      exists: false,
+      errorCode:
+        typeof (error as NodeJS.ErrnoException | undefined)?.code === 'string'
+          ? (error as NodeJS.ErrnoException).code
+          : undefined,
+    };
+  }
+}
+
+function fingerprintToString(value: unknown): string {
+  return JSON.stringify(value);
+}
+
+function isCacheSafeFingerprint(fingerprint: PathFingerprint): boolean {
+  if (fingerprint.exists) {
+    return fingerprint.highResolution === true;
+  }
+  return fingerprint.errorCode === 'ENOENT' || fingerprint.errorCode === 'ENOTDIR';
+}
+
+function makeTeamSummaryOptionKey(payload: ListTeamsPayload): string {
+  return fingerprintToString({
+    largeConfigBytes: payload.largeConfigBytes,
+    configHeadBytes: payload.configHeadBytes,
+    maxConfigBytes: payload.maxConfigBytes,
+    maxConfigReadMs: payload.maxConfigReadMs,
+    maxMembersMetaBytes: payload.maxMembersMetaBytes,
+    maxSessionHistoryInSummary: payload.maxSessionHistoryInSummary,
+    maxProjectPathHistoryInSummary: payload.maxProjectPathHistoryInSummary,
+  });
+}
+
+function makeTeamSummaryCacheKey(teamsDir: string, teamName: string, optionKey: string): string {
+  return `${teamsDir}\0${teamName}\0${optionKey}`;
+}
+
+function canCacheTeamSummary(summary: Record<string, unknown>): boolean {
+  if (summary.teamLaunchState === 'partial_pending') {
+    return false;
+  }
+  const pendingKeys = [
+    'pendingCount',
+    'runtimeAlivePendingCount',
+    'shellOnlyPendingCount',
+    'runtimeProcessPendingCount',
+    'runtimeCandidatePendingCount',
+    'noRuntimePendingCount',
+    'permissionPendingCount',
+  ];
+  return pendingKeys.every((key) => {
+    const value = summary[key];
+    return typeof value !== 'number' || value <= 0;
+  });
+}
+
+async function readInboxNamesFingerprint(inboxDir: string): Promise<{
+  dir: PathFingerprint;
+  names: string[];
+  cacheSafe: boolean;
+}> {
+  const dir = await statPathFingerprint(inboxDir);
+  if (!dir.exists || !dir.isDirectory) {
+    return { dir, names: [], cacheSafe: isCacheSafeFingerprint(dir) };
+  }
+  try {
+    const entries = await fs.promises.readdir(inboxDir, { withFileTypes: true });
+    const names = entries
+      .filter((entry) => entry.isFile() && entry.name.endsWith('.json'))
+      .map((entry) => entry.name)
+      .sort();
+    return { dir, names, cacheSafe: isCacheSafeFingerprint(dir) };
+  } catch (error) {
+    return {
+      dir: {
+        ...dir,
+        errorCode:
+          typeof (error as NodeJS.ErrnoException | undefined)?.code === 'string'
+            ? (error as NodeJS.ErrnoException).code
+            : 'READDIR_FAILED',
+      },
+      names: [],
+      cacheSafe: false,
+    };
+  }
+}
+
+async function buildTeamSummaryFingerprint(
+  teamsDir: string,
+  teamName: string,
+  optionKey: string
+): Promise<TeamSummaryDependencyFingerprint> {
+  const teamDir = path.join(teamsDir, teamName);
+  const [
+    config,
+    teamMeta,
+    membersMeta,
+    launchState,
+    launchSummary,
+    bootstrapState,
+    bootstrapJournal,
+  ] = await Promise.all([
+    statPathFingerprint(path.join(teamDir, 'config.json')),
+    statPathFingerprint(path.join(teamDir, 'team.meta.json')),
+    statPathFingerprint(path.join(teamDir, 'members.meta.json')),
+    statPathFingerprint(path.join(teamDir, TEAM_LAUNCH_STATE_FILE)),
+    statPathFingerprint(path.join(teamDir, TEAM_LAUNCH_SUMMARY_FILE)),
+    statPathFingerprint(path.join(teamDir, BOOTSTRAP_STATE_FILE)),
+    statPathFingerprint(path.join(teamDir, BOOTSTRAP_JOURNAL_FILE)),
+  ]);
+  const inbox = await readInboxNamesFingerprint(path.join(teamDir, 'inboxes'));
+
+  const dependencyFingerprint = {
+    version: 1,
+    optionKey,
+    config,
+    teamMeta,
+    membersMeta,
+    launchState,
+    launchSummary,
+    bootstrapState,
+    bootstrapJournal,
+    inbox,
+  };
+
+  return {
+    value: fingerprintToString(dependencyFingerprint),
+    cacheSafe:
+      [
+        config,
+        teamMeta,
+        membersMeta,
+        launchState,
+        launchSummary,
+        bootstrapState,
+        bootstrapJournal,
+      ].every(isCacheSafeFingerprint) && inbox.cacheSafe,
+  };
+}
+
+async function cacheTeamSummaryIfStable(
+  cacheKey: string,
+  teamsDir: string,
+  teamName: string,
+  optionKey: string,
+  fingerprintBefore: TeamSummaryDependencyFingerprint,
+  summary: Record<string, unknown>,
+  cacheAllowed: boolean,
+  diag: ListTeamsDiag
+): Promise<void> {
+  if (!cacheAllowed) {
+    teamSummaryCache.delete(cacheKey);
+    diag.cacheWriteSkips++;
+    return;
+  }
+  if (!canCacheTeamSummary(summary)) {
+    teamSummaryCache.delete(cacheKey);
+    diag.cacheWriteSkips++;
+    return;
+  }
+  if (!fingerprintBefore.cacheSafe) {
+    diag.cacheWriteSkips++;
+    return;
+  }
+  const fingerprintAfter = await buildTeamSummaryFingerprint(teamsDir, teamName, optionKey);
+  if (!fingerprintAfter.cacheSafe || fingerprintAfter.value !== fingerprintBefore.value) {
+    diag.cacheWriteSkips++;
+    return;
+  }
+  teamSummaryCache.set(cacheKey, {
+    fingerprint: fingerprintAfter.value,
+    summary: cloneCached(summary),
+    teamsDir,
+    optionKey,
+    lastUsedAt: nowMs(),
+  });
+}
+
+function pruneTeamSummaryCache(
+  teamsDir: string,
+  optionKey: string,
+  liveTeamNames: ReadonlySet<string>,
+  diag: ListTeamsDiag
+): void {
+  for (const [key, entry] of teamSummaryCache) {
+    if (entry.teamsDir === teamsDir && entry.optionKey === optionKey) {
+      const teamName = key.split('\0')[1] ?? '';
+      if (!liveTeamNames.has(teamName)) {
+        teamSummaryCache.delete(key);
+        diag.cacheEvictions++;
+      }
+    }
+  }
+  while (teamSummaryCache.size > TEAM_SUMMARY_CACHE_MAX_ENTRIES) {
+    const oldest = teamSummaryCache.keys().next().value;
+    if (typeof oldest !== 'string') break;
+    teamSummaryCache.delete(oldest);
+    diag.cacheEvictions++;
+  }
+}
+
+function makeTaskOptionKey(payload: GetAllTasksPayload): string {
+  return fingerprintToString({
+    maxTaskBytes: payload.maxTaskBytes,
+    maxTaskReadMs: payload.maxTaskReadMs,
+  });
+}
+
+function makeTaskCacheKey(
+  tasksBase: string,
+  teamName: string,
+  fileName: string,
+  optionKey: string
+): string {
+  return `${tasksBase}\0${teamName}\0${fileName}\0${optionKey}`;
+}
+
+async function cacheTaskReadResultIfStable(
+  cacheKey: string,
+  taskPath: string,
+  tasksBase: string,
+  fingerprintBefore: string,
+  fingerprintBeforeCacheSafe: boolean,
+  result: CachedTaskReadResult,
+  taskDiag: TaskReadDiag
+): Promise<void> {
+  if (!fingerprintBeforeCacheSafe) {
+    taskDiag.cacheWriteSkips++;
+    return;
+  }
+  const after = await statPathFingerprint(taskPath);
+  if (!isCacheSafeFingerprint(after) || fingerprintToString(after) !== fingerprintBefore) {
+    taskDiag.cacheWriteSkips++;
+    return;
+  }
+  taskFileCache.set(cacheKey, {
+    fingerprint: fingerprintBefore,
+    result: cloneCached(result),
+    tasksBase,
+    lastUsedAt: nowMs(),
+  });
+}
+
+function applyCachedTaskReadResult(
+  cached: CachedTaskReadResult,
+  tasks: unknown[],
+  taskDiag: TaskReadDiag
+): void {
+  if (cached.skipReason) {
+    taskDiag.skipped++;
+    bumpSkipReason(taskDiag.skipReasons, cached.skipReason);
+    return;
+  }
+  tasks.push(cloneCached(cached.task));
+}
+
+function pruneTaskFileCache(
+  tasksBase: string,
+  liveCacheKeys: ReadonlySet<string>,
+  diag: GetAllTasksDiag
+): void {
+  for (const [key, entry] of taskFileCache) {
+    if (entry.tasksBase === tasksBase && !liveCacheKeys.has(key)) {
+      taskFileCache.delete(key);
+      diag.cacheEvictions++;
+    }
+  }
+  while (taskFileCache.size > TASK_FILE_CACHE_MAX_ENTRIES) {
+    const oldest = taskFileCache.keys().next().value;
+    if (typeof oldest !== 'string') break;
+    taskFileCache.delete(oldest);
+    diag.cacheEvictions++;
+  }
+}
+
 // ---------------------------------------------------------------------------
 // listTeams
 // ---------------------------------------------------------------------------
@@ -340,7 +719,7 @@ function dropCliProvisionerMembers(
 async function readLaunchState(
   teamsDir: string,
   teamName: string
-): Promise<ReturnType<typeof choosePreferredLaunchStateSummary>> {
+): Promise<LaunchStateSummaryRead> {
   const bootstrapSnapshot = await readBootstrapLaunchSnapshot(teamName);
   const launchStatePath = path.join(teamsDir, teamName, TEAM_LAUNCH_STATE_FILE);
   const launchSummaryPath = path.join(teamsDir, teamName, TEAM_LAUNCH_SUMMARY_FILE);
@@ -371,11 +750,24 @@ async function readLaunchState(
     })(),
   ]);
 
-  return choosePreferredLaunchStateSummary({
+  const summary = choosePreferredLaunchStateSummary({
     bootstrapSnapshot,
     launchSnapshot,
     launchSummaryProjection,
   });
+  if (launchSnapshot) {
+    return { summary, cacheable: true };
+  }
+  if (!bootstrapSnapshot) {
+    return { summary, cacheable: true };
+  }
+  if (
+    bootstrapSnapshot.launchPhase === 'finished' &&
+    bootstrapSnapshot.teamLaunchState !== 'partial_pending'
+  ) {
+    return { summary, cacheable: true };
+  }
+  return { summary, cacheable: false };
 }
 
 /**
@@ -465,6 +857,10 @@ async function listTeams(
     skipped: 0,
     skipReasons: {},
     slowest: [],
+    cacheHits: 0,
+    cacheMisses: 0,
+    cacheWriteSkips: 0,
+    cacheEvictions: 0,
     totalMs: 0,
   };
 
@@ -478,11 +874,26 @@ async function listTeams(
 
   const teamDirs = entries.filter((e) => e.isDirectory());
   diag.totalDirs = teamDirs.length;
+  const optionKey = makeTeamSummaryOptionKey(payload);
+  const liveTeamNames = new Set(teamDirs.map((entry) => entry.name));
 
   const perTeam = await mapLimit(teamDirs, payload.concurrency, async (entry) => {
     const teamName = entry.name;
     const t0 = nowMs();
     const configPath = path.join(payload.teamsDir, teamName, 'config.json');
+    const cacheKey = makeTeamSummaryCacheKey(payload.teamsDir, teamName, optionKey);
+    const dependencyFingerprint = await buildTeamSummaryFingerprint(
+      payload.teamsDir,
+      teamName,
+      optionKey
+    );
+    const cached = teamSummaryCache.get(cacheKey);
+    if (dependencyFingerprint.cacheSafe && cached?.fingerprint === dependencyFingerprint.value) {
+      cached.lastUsedAt = nowMs();
+      diag.cacheHits++;
+      return cloneCached(cached.summary);
+    }
+    diag.cacheMisses++;
 
     const skip = (reason: string): null => {
       diag.skipped++;
@@ -496,12 +907,36 @@ async function listTeams(
     } catch {
       // Fallback: check for draft team (team.meta.json without config.json)
       const draft = await readDraftTeamMeta(payload.teamsDir, teamName, payload);
-      if (draft) return draft;
+      if (draft) {
+        await cacheTeamSummaryIfStable(
+          cacheKey,
+          payload.teamsDir,
+          teamName,
+          optionKey,
+          dependencyFingerprint,
+          draft,
+          true,
+          diag
+        );
+        return draft;
+      }
       return skip('config_stat_failed');
     }
     if (!stat.isFile()) {
       const draft = await readDraftTeamMeta(payload.teamsDir, teamName, payload);
-      if (draft) return draft;
+      if (draft) {
+        await cacheTeamSummaryIfStable(
+          cacheKey,
+          payload.teamsDir,
+          teamName,
+          optionKey,
+          dependencyFingerprint,
+          draft,
+          true,
+          diag
+        );
+        return draft;
+      }
       return skip('config_not_file');
     }
     if (stat.size > payload.maxConfigBytes) return skip('config_too_large');
@@ -692,32 +1127,28 @@ async function listTeams(
       leadProviderId,
       members: metaRuntimeMembers,
     });
-    const launchStateSummary =
-      (await readLaunchState(payload.teamsDir, teamName)) ??
-      (() => {
-        if (suppressLegacyLaunchArtifactHeuristic) {
-          return null;
-        }
-        if (
-          !leadSessionId ||
-          expectedTeammateNames.size === 0 ||
-          confirmedArtifactNames.size === 0
-        ) {
-          return null;
-        }
-        const missingMembers = Array.from(expectedTeammateNames).filter(
-          (name) => !confirmedArtifactNames.has(name)
-        );
-        if (missingMembers.length === 0) {
-          return null;
-        }
-        return {
-          partialLaunchFailure: true as const,
-          expectedMemberCount: expectedTeammateNames.size,
-          confirmedMemberCount: confirmedArtifactNames.size,
-          missingMembers,
-        };
-      })();
+    const launchStateRead = await readLaunchState(payload.teamsDir, teamName);
+    const fallbackLaunchStateSummary = (): ReturnType<typeof choosePreferredLaunchStateSummary> => {
+      if (suppressLegacyLaunchArtifactHeuristic) {
+        return null;
+      }
+      if (!leadSessionId || expectedTeammateNames.size === 0 || confirmedArtifactNames.size === 0) {
+        return null;
+      }
+      const missingMembers = Array.from(expectedTeammateNames).filter(
+        (name) => !confirmedArtifactNames.has(name)
+      );
+      if (missingMembers.length === 0) {
+        return null;
+      }
+      return {
+        partialLaunchFailure: true as const,
+        expectedMemberCount: expectedTeammateNames.size,
+        confirmedMemberCount: confirmedArtifactNames.size,
+        missingMembers,
+      };
+    };
+    const launchStateSummary = launchStateRead.summary ?? fallbackLaunchStateSummary();
     const summary = {
       teamName,
       displayName,
@@ -741,10 +1172,21 @@ async function listTeams(
     if (ms >= 250) {
       pushSlowest(diag.slowest, { teamName, ms }, 10);
     }
+    await cacheTeamSummaryIfStable(
+      cacheKey,
+      payload.teamsDir,
+      teamName,
+      optionKey,
+      dependencyFingerprint,
+      summary,
+      launchStateRead.cacheable,
+      diag
+    );
     return summary;
   });
 
   const teams = perTeam.filter((t): t is NonNullable<typeof t> => t !== null);
+  pruneTeamSummaryCache(payload.teamsDir, optionKey, liveTeamNames, diag);
   diag.returned = teams.length;
   diag.totalMs = nowMs() - startedAt;
   return { teams, diag };
@@ -880,19 +1322,27 @@ async function readTasksDirForTeam(
   tasksDir: string,
   teamName: string,
   payload: GetAllTasksPayload
-): Promise<{ tasks: unknown[]; taskDiag: TaskReadDiag }> {
-  const taskDiag: TaskReadDiag = { skipped: 0, skipReasons: {} };
+): Promise<{ tasks: unknown[]; taskDiag: TaskReadDiag; liveCacheKeys: Set<string> }> {
+  const taskDiag: TaskReadDiag = {
+    skipped: 0,
+    skipReasons: {},
+    cacheHits: 0,
+    cacheMisses: 0,
+    cacheWriteSkips: 0,
+  };
   let entries: string[];
   try {
     entries = await fs.promises.readdir(tasksDir);
   } catch (error) {
     if ((error as NodeJS.ErrnoException).code === 'ENOENT') {
-      return { tasks: [], taskDiag };
+      return { tasks: [], taskDiag, liveCacheKeys: new Set() };
     }
     throw error;
   }
 
   const tasks: unknown[] = [];
+  const liveCacheKeys = new Set<string>();
+  const optionKey = makeTaskOptionKey(payload);
   for (const file of entries) {
     if (
       !file.endsWith('.json') ||
@@ -904,25 +1354,61 @@ async function readTasksDirForTeam(
     }
 
     const taskPath = path.join(tasksDir, file);
+    const cacheKey = makeTaskCacheKey(payload.tasksBase, teamName, file, optionKey);
+    liveCacheKeys.add(cacheKey);
     try {
-      const stat = await fs.promises.stat(taskPath);
-      if (!stat.isFile() || stat.size > payload.maxTaskBytes) {
+      const pathFingerprint = await statPathFingerprint(taskPath);
+      const taskSize = Number(pathFingerprint.size ?? Number.NaN);
+      if (
+        !pathFingerprint.isFile ||
+        !Number.isFinite(taskSize) ||
+        taskSize > payload.maxTaskBytes
+      ) {
         taskDiag.skipped++;
         bumpSkipReason(taskDiag.skipReasons, 'task_not_file_or_large');
         continue;
       }
+      const fingerprint = fingerprintToString(pathFingerprint);
+      const fingerprintCacheSafe = isCacheSafeFingerprint(pathFingerprint);
+      const cached = taskFileCache.get(cacheKey);
+      if (fingerprintCacheSafe && cached?.fingerprint === fingerprint) {
+        cached.lastUsedAt = nowMs();
+        taskDiag.cacheHits++;
+        applyCachedTaskReadResult(cached.result, tasks, taskDiag);
+        continue;
+      }
+      taskDiag.cacheMisses++;
 
+      const stat = await fs.promises.stat(taskPath);
       const raw = await readFileUtf8WithTimeout(taskPath, payload.maxTaskReadMs);
       const parsed = JSON.parse(raw) as ParsedTask;
       const metadata = parsed.metadata;
       if (metadata?._internal === true) {
         taskDiag.skipped++;
         bumpSkipReason(taskDiag.skipReasons, 'task_internal');
+        await cacheTaskReadResultIfStable(
+          cacheKey,
+          taskPath,
+          payload.tasksBase,
+          fingerprint,
+          fingerprintCacheSafe,
+          { skipReason: 'task_internal' },
+          taskDiag
+        );
         continue;
       }
       if (parsed.status === 'deleted') {
         taskDiag.skipped++;
         bumpSkipReason(taskDiag.skipReasons, 'task_deleted');
+        await cacheTaskReadResultIfStable(
+          cacheKey,
+          taskPath,
+          payload.tasksBase,
+          fingerprint,
+          fingerprintCacheSafe,
+          { skipReason: 'task_deleted' },
+          taskDiag
+        );
         continue;
       }
 
@@ -962,7 +1448,7 @@ async function readTasksDirForTeam(
         deriveReviewStateFromEvents(historyEvents) ??
         normalizeFallbackReviewState(parsed.reviewState, status);
 
-      tasks.push({
+      const task = {
         id: typeof parsed.id === 'string' || typeof parsed.id === 'number' ? String(parsed.id) : '',
         displayId:
           typeof parsed.displayId === 'string' && parsed.displayId.trim().length > 0
@@ -1018,7 +1504,17 @@ async function readTasksDirForTeam(
             ? (parsed.sourceMessage as Record<string, unknown>)
             : undefined,
         teamName,
-      });
+      };
+      tasks.push(task);
+      await cacheTaskReadResultIfStable(
+        cacheKey,
+        taskPath,
+        payload.tasksBase,
+        fingerprint,
+        fingerprintCacheSafe,
+        { task },
+        taskDiag
+      );
     } catch (error) {
       taskDiag.skipped++;
       const code = (error as NodeJS.ErrnoException).code;
@@ -1029,11 +1525,14 @@ async function readTasksDirForTeam(
       }
     }
   }
-  return { tasks, taskDiag };
+  return { tasks, taskDiag, liveCacheKeys };
 }
 
 function mergeTaskDiag(target: GetAllTasksDiag, source: TaskReadDiag): void {
   target.skipped += source.skipped;
+  target.cacheHits += source.cacheHits;
+  target.cacheMisses += source.cacheMisses;
+  target.cacheWriteSkips += source.cacheWriteSkips;
   for (const [reason, count] of Object.entries(source.skipReasons)) {
     target.skipReasons[reason] = (target.skipReasons[reason] || 0) + count;
   }
@@ -1052,6 +1551,10 @@ async function getAllTasks(
     skipped: 0,
     skipReasons: {},
     slowestTeams: [],
+    cacheHits: 0,
+    cacheMisses: 0,
+    cacheWriteSkips: 0,
+    cacheEvictions: 0,
     totalMs: 0,
   };
 
@@ -1068,13 +1571,21 @@ async function getAllTasks(
 
   const dirs = entries.filter((e) => e.isDirectory());
   diag.teamDirs = dirs.length;
+  const liveCacheKeys = new Set<string>();
 
   const chunks = await mapLimit(dirs, payload.concurrency, async (entry) => {
     const teamName = entry.name;
     const t0 = nowMs();
     try {
       const tasksDir = path.join(payload.tasksBase, teamName);
-      const { tasks, taskDiag } = await readTasksDirForTeam(tasksDir, teamName, payload);
+      const {
+        tasks,
+        taskDiag,
+        liveCacheKeys: teamLiveCacheKeys,
+      } = await readTasksDirForTeam(tasksDir, teamName, payload);
+      for (const key of teamLiveCacheKeys) {
+        liveCacheKeys.add(key);
+      }
       mergeTaskDiag(diag, taskDiag);
       const ms = nowMs() - t0;
       if (ms >= 250) {
@@ -1089,6 +1600,7 @@ async function getAllTasks(
   });
 
   const tasks = chunks.flat();
+  pruneTaskFileCache(payload.tasksBase, liveCacheKeys, diag);
   diag.returned = tasks.length;
   diag.totalMs = nowMs() - startedAt;
   return { tasks, diag };
@@ -1105,6 +1617,19 @@ function post(msg: WorkerResponse): void {
 parentPort?.on('message', async (msg: WorkerRequest) => {
   const { id, op } = msg;
   try {
+    if (op === 'warmup') {
+      post({
+        id,
+        ok: true,
+        result: {
+          ready: true,
+          teamSummaryCacheEntries: teamSummaryCache.size,
+          taskFileCacheEntries: taskFileCache.size,
+        },
+        diag: { op, totalMs: 0 },
+      });
+      return;
+    }
     if (op === 'listTeams') {
       const { teams, diag } = await listTeams(msg.payload);
       post({ id, ok: true, result: teams, diag });
diff --git a/test/main/services/team/TeamDataWorkerClient.test.ts b/test/main/services/team/TeamDataWorkerClient.test.ts
index fac20503..a3cd518a 100644
--- a/test/main/services/team/TeamDataWorkerClient.test.ts
+++ b/test/main/services/team/TeamDataWorkerClient.test.ts
@@ -93,6 +93,25 @@ describe('TeamDataWorkerClient', () => {
     client.dispose();
   });
 
+  it('does not queue warmup behind an already running worker', async () => {
+    const { TeamDataWorkerClient } = await import(
+      '../../../../src/main/services/team/TeamDataWorkerClient'
+    );
+    const client = new TeamDataWorkerClient();
+
+    await client.getTeamData('my-team');
+    await client.prewarm();
+
+    expect(hoisted.workers).toHaveLength(1);
+    expect(hoisted.workers[0].messages).toHaveLength(1);
+    expect(hoisted.workers[0].messages[0]).toMatchObject({
+      op: 'getTeamData',
+      payload: { teamName: 'my-team' },
+    });
+
+    client.dispose();
+  });
+
   it('sends best-effort team config invalidation to the worker', async () => {
     const { TeamDataWorkerClient } = await import(
       '../../../../src/main/services/team/TeamDataWorkerClient'
diff --git a/test/main/services/team/TeamFsWorker.integration.test.ts b/test/main/services/team/TeamFsWorker.integration.test.ts
index 5cacefb2..e2085b93 100644
--- a/test/main/services/team/TeamFsWorker.integration.test.ts
+++ b/test/main/services/team/TeamFsWorker.integration.test.ts
@@ -11,6 +11,7 @@ interface WorkerResponse {
   id: string;
   ok: boolean;
   result?: unknown;
+  diag?: unknown;
   error?: string;
 }
 
@@ -44,7 +45,11 @@ function createWorker(workerPath: string): Worker {
   return new Worker(workerPath);
 }
 
-function callListTeams(worker: Worker, teamsDir: string): Promise<unknown[]> {
+function callWorker(
+  worker: Worker,
+  op: string,
+  payload: Record<string, unknown> = {}
+): Promise<{ result: unknown; diag?: unknown }> {
   const requestId = `req-${Date.now()}`;
   return new Promise((resolve, reject) => {
     const timeout = setTimeout(() => {
@@ -72,29 +77,56 @@ function callListTeams(worker: Worker, teamsDir: string): Promise<unknown[]> {
         reject(new Error(message.error || 'team-fs-worker returned an unknown error'));
         return;
       }
-      resolve(Array.isArray(message.result) ? message.result : []);
+      resolve({ result: message.result, diag: message.diag });
     };
 
     worker.on('message', onMessage);
     worker.on('error', onError);
-    worker.postMessage({
-      id: requestId,
-      op: 'listTeams',
-      payload: {
-        teamsDir,
-        largeConfigBytes: 8 * 1024,
-        configHeadBytes: 4 * 1024,
-        maxConfigBytes: 256 * 1024,
-        maxConfigReadMs: 5_000,
-        maxMembersMetaBytes: 256 * 1024,
-        maxSessionHistoryInSummary: 10,
-        maxProjectPathHistoryInSummary: 10,
-        concurrency: 2,
-      },
-    });
+    worker.postMessage({ id: requestId, op, payload });
   });
 }
 
+async function callListTeams(worker: Worker, teamsDir: string): Promise<{
+  teams: unknown[];
+  diag?: Record<string, unknown>;
+}> {
+  const { result, diag } = await callWorker(worker, 'listTeams', {
+    teamsDir,
+    largeConfigBytes: 8 * 1024,
+    configHeadBytes: 4 * 1024,
+    maxConfigBytes: 256 * 1024,
+    maxConfigReadMs: 5_000,
+    maxMembersMetaBytes: 256 * 1024,
+    maxSessionHistoryInSummary: 10,
+    maxProjectPathHistoryInSummary: 10,
+    concurrency: 2,
+  });
+  return {
+    teams: Array.isArray(result) ? result : [],
+    diag: diag && typeof diag === 'object' ? (diag as Record<string, unknown>) : undefined,
+  };
+}
+
+async function callGetAllTasks(worker: Worker, tasksBase: string): Promise<{
+  tasks: unknown[];
+  diag?: Record<string, unknown>;
+}> {
+  const { result, diag } = await callWorker(worker, 'getAllTasks', {
+    tasksBase,
+    maxTaskBytes: 256 * 1024,
+    maxTaskReadMs: 5_000,
+    concurrency: 2,
+  });
+  return {
+    tasks: Array.isArray(result) ? result : [],
+    diag: diag && typeof diag === 'object' ? (diag as Record<string, unknown>) : undefined,
+  };
+}
+
+async function callWarmup(worker: Worker): Promise<void> {
+  await callWorker(worker, 'warmup');
+}
+
 describe('team-fs-worker integration', () => {
   let tempDir = '';
 
@@ -183,7 +215,7 @@ describe('team-fs-worker integration', () => {
 
     const worker = createWorker(workerPath);
     try {
-      const teams = (await callListTeams(worker, tempDir)) as Array<Record<string, unknown>>;
+      const { teams } = await callListTeams(worker, tempDir);
       expect(teams).toHaveLength(1);
       expect(teams[0]).toMatchObject({
         teamName,
@@ -234,7 +266,7 @@ describe('team-fs-worker integration', () => {
 
     const worker = createWorker(workerPath);
     try {
-      const teams = (await callListTeams(worker, tempDir)) as Array<Record<string, unknown>>;
+      const { teams } = await callListTeams(worker, tempDir);
       expect(teams).toHaveLength(1);
       expect(teams[0]).toMatchObject({
         teamName,
@@ -247,4 +279,150 @@ describe('team-fs-worker integration', () => {
       await worker.terminate();
     }
   });
+
+  it('prewarms and reuses unchanged team summaries by fingerprint', async () => {
+    const workerPath = await getWorkerPath();
+    tempDir = await fs.mkdtemp(path.join(os.tmpdir(), 'team-fs-worker-'));
+    const teamName = 'cached-worker-team';
+    const teamDir = path.join(tempDir, teamName);
+    await fs.mkdir(path.join(teamDir, 'inboxes'), { recursive: true });
+    await fs.writeFile(
+      path.join(teamDir, 'config.json'),
+      JSON.stringify({
+        name: 'Cached Worker Team',
+        members: [{ name: 'team-lead', agentType: 'team-lead' }],
+      }),
+      'utf8'
+    );
+    await fs.writeFile(
+      path.join(teamDir, 'members.meta.json'),
+      JSON.stringify({ version: 1, members: [{ name: 'alice' }] }),
+      'utf8'
+    );
+
+    const worker = createWorker(workerPath);
+    try {
+      await callWarmup(worker);
+      const first = await callListTeams(worker, tempDir);
+      expect(first.teams[0]).toMatchObject({ teamName, memberCount: 1 });
+      expect(first.diag?.cacheMisses).toBe(1);
+
+      const second = await callListTeams(worker, tempDir);
+      expect(second.teams[0]).toMatchObject({ teamName, memberCount: 1 });
+      expect(second.diag?.cacheHits).toBe(1);
+
+      await fs.writeFile(
+        path.join(teamDir, 'members.meta.json'),
+        JSON.stringify({ version: 1, members: [{ name: 'alice' }, { name: 'bob' }] }),
+        'utf8'
+      );
+      const changed = await callListTeams(worker, tempDir);
+      expect(changed.teams[0]).toMatchObject({ teamName, memberCount: 2 });
+      expect(changed.diag?.cacheMisses).toBe(1);
+    } finally {
+      await worker.terminate();
+    }
+  });
+
+  it('does not cache pending launch summaries because liveness can change without file writes', async () => {
+    const workerPath = await getWorkerPath();
+    tempDir = await fs.mkdtemp(path.join(os.tmpdir(), 'team-fs-worker-'));
+    const teamName = 'pending-launch-team';
+    const teamDir = path.join(tempDir, teamName);
+    await fs.mkdir(teamDir, { recursive: true });
+    await fs.writeFile(
+      path.join(teamDir, 'config.json'),
+      JSON.stringify({
+        name: 'Pending Launch Team',
+        members: [{ name: 'team-lead', agentType: 'team-lead' }],
+      }),
+      'utf8'
+    );
+    await fs.writeFile(
+      path.join(teamDir, 'launch-summary.json'),
+      JSON.stringify({
+        version: 1,
+        teamName,
+        updatedAt: '2026-05-02T12:00:00.000Z',
+        teamLaunchState: 'partial_pending',
+        expectedMemberCount: 1,
+        pendingCount: 1,
+      }),
+      'utf8'
+    );
+
+    const worker = createWorker(workerPath);
+    try {
+      const first = await callListTeams(worker, tempDir);
+      expect(first.teams[0]).toMatchObject({
+        teamName,
+        teamLaunchState: 'partial_pending',
+        pendingCount: 1,
+      });
+      expect(first.diag?.cacheMisses).toBe(1);
+      expect(first.diag?.cacheWriteSkips).toBe(1);
+
+      const second = await callListTeams(worker, tempDir);
+      expect(second.teams[0]).toMatchObject({
+        teamName,
+        teamLaunchState: 'partial_pending',
+        pendingCount: 1,
+      });
+      expect(second.diag?.cacheHits).toBe(0);
+      expect(second.diag?.cacheMisses).toBe(1);
+      expect(second.diag?.cacheWriteSkips).toBe(1);
+    } finally {
+      await worker.terminate();
+    }
+  });
+
+  it('reuses unchanged parsed tasks and rereads changed task files by fingerprint', async () => {
+    const workerPath = await getWorkerPath();
+    tempDir = await fs.mkdtemp(path.join(os.tmpdir(), 'team-fs-worker-'));
+    const tasksBase = path.join(tempDir, 'tasks');
+    const teamName = 'task-cache-team';
+    const tasksDir = path.join(tasksBase, teamName);
+    await fs.mkdir(tasksDir, { recursive: true });
+    const taskPath = path.join(tasksDir, '1.json');
+    await fs.writeFile(
+      taskPath,
+      JSON.stringify({
+        id: '1',
+        subject: 'First subject',
+        status: 'pending',
+        createdAt: '2026-05-02T12:00:00.000Z',
+      }),
+      'utf8'
+    );
+
+    const worker = createWorker(workerPath);
+    try {
+      const first = await callGetAllTasks(worker, tasksBase);
+      expect(first.tasks[0]).toMatchObject({ teamName, subject: 'First subject' });
+      expect(first.diag?.cacheMisses).toBe(1);
+
+      const second = await callGetAllTasks(worker, tasksBase);
+      expect(second.tasks[0]).toMatchObject({ teamName, subject: 'First subject' });
+      expect(second.diag?.cacheHits).toBe(1);
+
+      await fs.writeFile(
+        taskPath,
+        JSON.stringify({
+          id: '1',
+          subject: 'Changed subject with a different size',
+          status: 'pending',
+          createdAt: '2026-05-02T12:00:00.000Z',
+        }),
+        'utf8'
+      );
+      const changed = await callGetAllTasks(worker, tasksBase);
+      expect(changed.tasks[0]).toMatchObject({
+        teamName,
+        subject: 'Changed subject with a different size',
+      });
+      expect(changed.diag?.cacheMisses).toBe(1);
+    } finally {
+      await worker.terminate();
+    }
+  });
 });
diff --git a/test/main/services/team/TeamFsWorkerClient.test.ts b/test/main/services/team/TeamFsWorkerClient.test.ts
new file mode 100644
index 00000000..48a3a9f9
--- /dev/null
+++ b/test/main/services/team/TeamFsWorkerClient.test.ts
@@ -0,0 +1,152 @@
+import { afterEach, describe, expect, it, vi } from 'vitest';
+
+const hoisted = vi.hoisted(() => {
+  const skipResponsesForOps = new Set<string>();
+  const workers: Array<{
+    messages: unknown[];
+    handlers: Map<string, (value: unknown) => void>;
+    postMessage: (message: unknown) => void;
+    on: (event: string, handler: (value: unknown) => void) => void;
+    terminate: ReturnType<typeof vi.fn>;
+  }> = [];
+  const createMockWorker = vi.fn().mockImplementation(() => {
+    const worker = {
+      messages: [] as unknown[],
+      handlers: new Map<string, (value: unknown) => void>(),
+      postMessage(message: unknown) {
+        worker.messages.push(message);
+        const request = message as { id: string; op: string };
+        if (skipResponsesForOps.has(request.op)) return;
+        queueMicrotask(() => {
+          const handler = worker.handlers.get('message');
+          if (!handler) return;
+          handler({
+            id: request.id,
+            ok: true,
+            result: request.op === 'listTeams' || request.op === 'getAllTasks' ? [] : null,
+            diag: { op: request.op, totalMs: 0 },
+          });
+        });
+      },
+      on(event: string, handler: (value: unknown) => void) {
+        worker.handlers.set(event, handler);
+      },
+      terminate: vi.fn(async () => undefined),
+    };
+    workers.push(worker);
+    return worker;
+  });
+  return {
+    workers,
+    createMockWorker,
+    skipResponsesForOps,
+  };
+});
+
+vi.mock('node:fs', async () => {
+  const actual = await vi.importActual<typeof import('node:fs')>('node:fs');
+  return {
+    ...actual,
+    existsSync: vi.fn(() => true),
+  };
+});
+
+vi.mock('node:worker_threads', () => ({
+  Worker: hoisted.createMockWorker,
+  default: {
+    Worker: hoisted.createMockWorker,
+  },
+}));
+
+describe('TeamFsWorkerClient', () => {
+  afterEach(() => {
+    vi.resetModules();
+    vi.clearAllMocks();
+    vi.useRealTimers();
+    hoisted.workers.length = 0;
+    hoisted.skipResponsesForOps.clear();
+  });
+
+  it('prewarms the worker without running a scan', async () => {
+    const { TeamFsWorkerClient } = await import(
+      '../../../../src/main/services/team/TeamFsWorkerClient'
+    );
+    const client = new TeamFsWorkerClient();
+
+    await client.prewarm();
+
+    expect(hoisted.workers).toHaveLength(1);
+    expect(hoisted.workers[0].messages).toHaveLength(1);
+    expect(hoisted.workers[0].messages[0]).toMatchObject({
+      op: 'warmup',
+      payload: {},
+    });
+  });
+
+  it('does not queue warmup behind an already running worker', async () => {
+    const { TeamFsWorkerClient } = await import(
+      '../../../../src/main/services/team/TeamFsWorkerClient'
+    );
+    const client = new TeamFsWorkerClient();
+
+    await client.listTeams({
+      largeConfigBytes: 8 * 1024,
+      configHeadBytes: 4 * 1024,
+      maxConfigBytes: 256 * 1024,
+      maxMembersMetaBytes: 256 * 1024,
+      maxSessionHistoryInSummary: 10,
+      maxProjectPathHistoryInSummary: 10,
+    });
+    await client.prewarm();
+
+    expect(hoisted.workers).toHaveLength(1);
+    expect(hoisted.workers[0].messages).toHaveLength(1);
+    expect(hoisted.workers[0].messages[0]).toMatchObject({
+      op: 'listTeams',
+    });
+  });
+
+  it('ignores stale worker exit after timeout when a replacement worker owns pending work', async () => {
+    vi.useFakeTimers();
+    hoisted.skipResponsesForOps.add('warmup');
+    hoisted.skipResponsesForOps.add('listTeams');
+    const { TeamFsWorkerClient } = await import(
+      '../../../../src/main/services/team/TeamFsWorkerClient'
+    );
+    const client = new TeamFsWorkerClient();
+
+    const prewarmResult = client.prewarm().catch((error: unknown) => error);
+    await vi.advanceTimersByTimeAsync(20_001);
+    const prewarmError = await prewarmResult;
+    expect(prewarmError).toBeInstanceOf(Error);
+    expect((prewarmError as Error).message).toContain('Worker call timeout');
+    expect(hoisted.workers).toHaveLength(1);
+
+    const listPromise = client.listTeams({
+      largeConfigBytes: 8 * 1024,
+      configHeadBytes: 4 * 1024,
+      maxConfigBytes: 256 * 1024,
+      maxMembersMetaBytes: 256 * 1024,
+      maxSessionHistoryInSummary: 10,
+      maxProjectPathHistoryInSummary: 10,
+    });
+
+    expect(hoisted.workers).toHaveLength(2);
+    const staleWorker = hoisted.workers[0];
+    const replacementWorker = hoisted.workers[1];
+    const listRequest = replacementWorker.messages[0] as { id: string };
+
+    staleWorker.handlers.get('exit')?.(1);
+    replacementWorker.handlers.get('message')?.({
+      id: listRequest.id,
+      ok: true,
+      result: [{ teamName: 'fresh-team', displayName: 'Fresh Team' }],
+      diag: { op: 'listTeams', totalMs: 1 },
+    });
+
+    await expect(listPromise).resolves.toEqual({
+      teams: [{ teamName: 'fresh-team', displayName: 'Fresh Team' }],
+      diag: { op: 'listTeams', totalMs: 1 },
+    });
+  });
+});
diff --git a/test/main/services/team/TeamProvisioningService.test.ts b/test/main/services/team/TeamProvisioningService.test.ts
index e0f21a28..02a791b4 100644
--- a/test/main/services/team/TeamProvisioningService.test.ts
+++ b/test/main/services/team/TeamProvisioningService.test.ts
@@ -206,6 +206,16 @@ function createPidusageStat(pid: number, memory: number) {
   };
 }
 
+function createDeferred<T>() {
+  let resolve!: (value: T | PromiseLike<T>) => void;
+  let reject!: (reason?: unknown) => void;
+  const promise = new Promise<T>((res, rej) => {
+    resolve = res;
+    reject = rej;
+  });
+  return { promise, resolve, reject };
+}
+
 function writeLaunchConfig(
   teamName: string,
   projectPath: string,
@@ -619,6 +629,182 @@ describe('TeamProvisioningService', () => {
   });
 
   describe('getTeamAgentRuntimeSnapshot', () => {
+    it('dedupes concurrent runtime snapshot probes for the same team', async () => {
+      const svc = new TeamProvisioningService();
+      (svc as any).configReader = {
+        getConfig: vi.fn(async () => ({
+          members: [
+            { name: 'team-lead', agentType: 'team-lead' },
+            { name: 'alice', model: 'gpt-5.4-mini' },
+          ],
+        })),
+      };
+      (svc as any).readPersistedRuntimeMembers = vi.fn(() => [
+        {
+          name: 'alice',
+          agentId: 'alice@runtime-team',
+          tmuxPaneId: '%1',
+          backendType: 'tmux',
+        },
+      ]);
+      (svc as any).aliveRunByTeam.set('runtime-team', 'run-1');
+      (svc as any).runs.set('run-1', {
+        runId: 'run-1',
+        child: { pid: 111 },
+        request: { model: 'gpt-5.4' },
+        processKilled: false,
+        cancelRequested: false,
+        spawnContext: null,
+      });
+      const paneInfo = createDeferred<Map<string, { paneId: string; panePid: number }>>();
+      vi.mocked(listTmuxPaneRuntimeInfoForCurrentPlatform).mockReturnValueOnce(
+        paneInfo.promise as ReturnType<typeof listTmuxPaneRuntimeInfoForCurrentPlatform>
+      );
+      vi.mocked(pidusage).mockResolvedValueOnce({
+        '111': createPidusageStat(111, 123_000_000),
+        '222': createPidusageStat(222, 456_000_000),
+      } as any);
+
+      const first = svc.getTeamAgentRuntimeSnapshot('runtime-team');
+      const second = svc.getTeamAgentRuntimeSnapshot('runtime-team');
+      paneInfo.resolve(
+        new Map([
+          [
+            '%1',
+            {
+              paneId: '%1',
+              panePid: 222,
+            },
+          ],
+        ])
+      );
+      const [firstSnapshot, secondSnapshot] = await Promise.all([first, second]);
+
+      expect(listTmuxPaneRuntimeInfoForCurrentPlatform).toHaveBeenCalledTimes(1);
+      expect(pidusage).toHaveBeenCalledTimes(1);
+      expect(firstSnapshot.members.alice?.pid).toBe(222);
+      expect(secondSnapshot.members.alice?.pid).toBe(222);
+    });
+
+    it('does not cache live runtime metadata when invalidated while the probe is in flight', async () => {
+      const svc = new TeamProvisioningService();
+      (svc as any).configReader = {
+        getConfig: vi.fn(async () => ({
+          members: [
+            { name: 'team-lead', agentType: 'team-lead' },
+            { name: 'alice', model: 'gpt-5.4-mini' },
+          ],
+        })),
+      };
+      const processRows = createDeferred<Awaited<ReturnType<typeof listRuntimeProcessesForCurrentTmuxPlatform>>>();
+      vi.mocked(listRuntimeProcessesForCurrentTmuxPlatform)
+        .mockReturnValueOnce(processRows.promise)
+        .mockResolvedValueOnce([]);
+
+      const first = (svc as any).getLiveTeamAgentRuntimeMetadata('runtime-team') as Promise<
+        Map<string, unknown>
+      >;
+      (svc as any).invalidateRuntimeSnapshotCaches('runtime-team');
+      processRows.resolve([]);
+      await first;
+
+      await (svc as any).getLiveTeamAgentRuntimeMetadata('runtime-team');
+
+      expect(listRuntimeProcessesForCurrentTmuxPlatform).toHaveBeenCalledTimes(2);
+    });
+
+    it('returns cloned live runtime metadata maps from cache', async () => {
+      const svc = new TeamProvisioningService();
+      (svc as any).configReader = {
+        getConfig: vi.fn(async () => ({
+          members: [
+            { name: 'team-lead', agentType: 'team-lead' },
+            { name: 'alice', model: 'gpt-5.4-mini' },
+          ],
+        })),
+      };
+      vi.mocked(listRuntimeProcessesForCurrentTmuxPlatform).mockResolvedValueOnce([]);
+
+      const first = (await (svc as any).getLiveTeamAgentRuntimeMetadata('runtime-team')) as Map<
+        string,
+        unknown
+      >;
+      expect(first.has('alice')).toBe(true);
+      first.delete('alice');
+
+      const second = (await (svc as any).getLiveTeamAgentRuntimeMetadata('runtime-team')) as Map<
+        string,
+        unknown
+      >;
+
+      expect(second.has('alice')).toBe(true);
+      expect(listRuntimeProcessesForCurrentTmuxPlatform).toHaveBeenCalledTimes(1);
+    });
+
+    it('clears runtime probe caches when starting a new run for the team', async () => {
+      const svc = new TeamProvisioningService();
+      (svc as any).configReader = {
+        getConfig: vi.fn(async () => ({
+          members: [
+            { name: 'team-lead', agentType: 'team-lead' },
+            { name: 'alice', model: 'gpt-5.4-mini' },
+          ],
+        })),
+      };
+      vi.mocked(listRuntimeProcessesForCurrentTmuxPlatform)
+        .mockResolvedValueOnce([])
+        .mockResolvedValueOnce([]);
+
+      await (svc as any).getLiveTeamAgentRuntimeMetadata('runtime-team');
+      (svc as any).resetTeamScopedTransientStateForNewRun('runtime-team');
+      await (svc as any).getLiveTeamAgentRuntimeMetadata('runtime-team');
+
+      expect(listRuntimeProcessesForCurrentTmuxPlatform).toHaveBeenCalledTimes(2);
+    });
+
+    it('does not cache a probe that started before runtime adapter evidence was installed', async () => {
+      const svc = new TeamProvisioningService();
+      (svc as any).configReader = {
+        getConfig: vi.fn(async () => ({
+          members: [
+            { name: 'team-lead', agentType: 'team-lead' },
+            { name: 'alice', providerId: 'opencode', model: 'gpt-5.4-mini' },
+          ],
+        })),
+      };
+      (svc as any).provisioningRunByTeam.set('runtime-team', 'run-1');
+      const processRows = createDeferred<Awaited<ReturnType<typeof listRuntimeProcessesForCurrentTmuxPlatform>>>();
+      vi.mocked(listRuntimeProcessesForCurrentTmuxPlatform)
+        .mockReturnValueOnce(processRows.promise)
+        .mockResolvedValueOnce([]);
+
+      const first = (svc as any).getLiveTeamAgentRuntimeMetadata('runtime-team') as Promise<
+        Map<string, unknown>
+      >;
+      (svc as any).runtimeAdapterRunByTeam.set('runtime-team', {
+        runId: 'run-1',
+        providerId: 'opencode',
+        cwd: '/tmp/runtime-project',
+        members: {
+          alice: {
+            providerId: 'opencode',
+            runtimeAlive: true,
+            bootstrapConfirmed: false,
+            runtimePid: 333,
+            livenessKind: 'runtime_process',
+            pidSource: 'agent_process_table',
+          },
+        },
+      });
+      (svc as any).invalidateRuntimeSnapshotCaches('runtime-team');
+      processRows.resolve([]);
+      await first;
+
+      await (svc as any).getLiveTeamAgentRuntimeMetadata('runtime-team');
+
+      expect(listRuntimeProcessesForCurrentTmuxPlatform).toHaveBeenCalledTimes(2);
+    });
+
     it('uses batched pidusage rss values for lead and teammates', async () => {
       const svc = new TeamProvisioningService();
       (svc as any).configReader = {