diff --git a/src/main/services/team/TeamProvisioningService.ts b/src/main/services/team/TeamProvisioningService.ts
index b5d16beb..f9b17d66 100644
--- a/src/main/services/team/TeamProvisioningService.ts
+++ b/src/main/services/team/TeamProvisioningService.ts
@@ -660,6 +660,8 @@ interface ProvisioningRun {
   >;
   /** Agent tool_use_id -> teammate name for persistent teammate spawns. */
   memberSpawnToolUseIds: Map<string, string>;
+  /** Highest accepted deterministic bootstrap event sequence for this run. */
+  lastDeterministicBootstrapSeq: number;
   /** Throttles config/inbox audit work triggered by frequent status polling. */
   lastMemberSpawnAuditAt: number;
   /** Throttles repeated audit warnings when config.json is temporarily unreadable. */
@@ -707,6 +709,33 @@ function createInitialMemberSpawnStatusEntry(): MemberSpawnStatusEntry {
   };
 }
 
+export function shouldAcceptDeterministicBootstrapEvent(params: {
+  runId: string;
+  teamName: string;
+  lastSeq: number;
+  msg: Record<string, unknown>;
+}): { accept: boolean; nextSeq: number } {
+  const msgRunId = typeof params.msg.run_id === 'string' ? params.msg.run_id.trim() : '';
+  if (msgRunId && msgRunId !== params.runId) {
+    return { accept: false, nextSeq: params.lastSeq };
+  }
+
+  const msgTeamName = typeof params.msg.team_name === 'string' ? params.msg.team_name.trim() : '';
+  if (msgTeamName && msgTeamName !== params.teamName) {
+    return { accept: false, nextSeq: params.lastSeq };
+  }
+
+  const seq = typeof params.msg.seq === 'number' ? params.msg.seq : NaN;
+  if (Number.isFinite(seq)) {
+    if (!Number.isInteger(seq) || seq <= params.lastSeq) {
+      return { accept: false, nextSeq: params.lastSeq };
+    }
+    return { accept: true, nextSeq: seq };
+  }
+
+  return { accept: true, nextSeq: params.lastSeq };
+}
+
 function deriveMemberLaunchState(entry: {
   agentToolAccepted?: boolean;
   runtimeAlive?: boolean;
@@ -4386,6 +4415,7 @@ export class TeamProvisioningService {
           request.members.map((m) => [m.name, createInitialMemberSpawnStatusEntry()])
         ),
         memberSpawnToolUseIds: new Map(),
+        lastDeterministicBootstrapSeq: 0,
         lastMemberSpawnAuditAt: 0,
         lastMemberSpawnAuditConfigReadWarningAt: 0,
         lastMemberSpawnAuditMissingWarningAt: new Map(),
@@ -4899,6 +4929,7 @@ export class TeamProvisioningService {
           expectedMembers.map((name) => [name, createInitialMemberSpawnStatusEntry()])
         ),
         memberSpawnToolUseIds: new Map(),
+        lastDeterministicBootstrapSeq: 0,
         lastMemberSpawnAuditAt: 0,
         lastMemberSpawnAuditConfigReadWarningAt: 0,
         lastMemberSpawnAuditMissingWarningAt: new Map(),
@@ -7069,6 +7100,17 @@ export class TeamProvisioningService {
       return false;
     }
 
+    const acceptance = shouldAcceptDeterministicBootstrapEvent({
+      runId: run.runId,
+      teamName: run.teamName,
+      lastSeq: run.lastDeterministicBootstrapSeq,
+      msg,
+    });
+    if (!acceptance.accept) {
+      return true;
+    }
+    run.lastDeterministicBootstrapSeq = acceptance.nextSeq;
+
     const event = typeof msg.event === 'string' ? msg.event : undefined;
     if (!event) {
       return true;
diff --git a/test/main/services/team/TeamProvisioningService.test.ts b/test/main/services/team/TeamProvisioningService.test.ts
index b67b2b7b..c94ace1f 100644
--- a/test/main/services/team/TeamProvisioningService.test.ts
+++ b/test/main/services/team/TeamProvisioningService.test.ts
@@ -100,6 +100,7 @@ describe('TeamProvisioningService', () => {
     fs.mkdirSync(tempProjectsBase, { recursive: true });
   });
 
+
   afterEach(() => {
     vi.useRealTimers();
     try {
diff --git a/test/main/services/team/TeamProvisioningServiceDeterministicBootstrapEvents.test.ts b/test/main/services/team/TeamProvisioningServiceDeterministicBootstrapEvents.test.ts
new file mode 100644
index 00000000..bac238ef
--- /dev/null
+++ b/test/main/services/team/TeamProvisioningServiceDeterministicBootstrapEvents.test.ts
@@ -0,0 +1,63 @@
+import { describe, expect, it } from 'vitest';
+
+import { shouldAcceptDeterministicBootstrapEvent } from '@main/services/team/TeamProvisioningService';
+
+describe('TeamProvisioningService deterministic bootstrap event ordering', () => {
+  it('accepts newer in-order bootstrap events', () => {
+    expect(
+      shouldAcceptDeterministicBootstrapEvent({
+        runId: 'run-1',
+        teamName: 'atlas-hq',
+        lastSeq: 2,
+        msg: {
+          run_id: 'run-1',
+          team_name: 'atlas-hq',
+          seq: 3,
+        },
+      })
+    ).toEqual({ accept: true, nextSeq: 3 });
+  });
+
+  it('rejects replayed or out-of-order bootstrap events', () => {
+    expect(
+      shouldAcceptDeterministicBootstrapEvent({
+        runId: 'run-1',
+        teamName: 'atlas-hq',
+        lastSeq: 3,
+        msg: {
+          run_id: 'run-1',
+          team_name: 'atlas-hq',
+          seq: 2,
+        },
+      })
+    ).toEqual({ accept: false, nextSeq: 3 });
+  });
+
+  it('rejects bootstrap events for another run or team', () => {
+    expect(
+      shouldAcceptDeterministicBootstrapEvent({
+        runId: 'run-1',
+        teamName: 'atlas-hq',
+        lastSeq: 1,
+        msg: {
+          run_id: 'run-2',
+          team_name: 'atlas-hq',
+          seq: 2,
+        },
+      })
+    ).toEqual({ accept: false, nextSeq: 1 });
+
+    expect(
+      shouldAcceptDeterministicBootstrapEvent({
+        runId: 'run-1',
+        teamName: 'atlas-hq',
+        lastSeq: 1,
+        msg: {
+          run_id: 'run-1',
+          team_name: 'forge-labs',
+          seq: 2,
+        },
+      })
+    ).toEqual({ accept: false, nextSeq: 1 });
+  });
+});