diff --git a/AGENT_STATUS_C10_RESULT.md b/AGENT_STATUS_C10_RESULT.md
new file mode 100644
index 00000000000..d21077c9886
--- /dev/null
+++ b/AGENT_STATUS_C10_RESULT.md
@@ -0,0 +1,54 @@
+# C10 implementation result
+
+## Completed cases and evidence
+
+- **Committed/adopted launch membership:** Added the host-owned launch-membership facet and admission path. `PtySpawnResult.agentSessionEnsure.owner.statusBinding` is the only source of `runId` and `attachment.executionId`; admission runs after PTY registration and early-exit validation, using the owner's final canonical surface. The existing owner result is used directly; no second reservation or C5 callback was added.
+- **Bare create-operation replay:** A result containing only `{ id, incarnationId }` is treated as deduplication evidence. It cannot seed a pane row or invoke membership publication. Regression coverage is in `terminal-creation-and-readiness-part-02.spec.ts`.
+- **Silent startup:** A committed or adopted owner publishes one compatibility row before provider output. The legacy state remains `done` with `sessionBoundary: true`; `launchMembership` is the authoritative presence facet, so launch does not become Working, waiting, completion, unread, or power-save activity.
+- **Adoption and repeated requests:** Created and adopted owner results retain the same binding and canonical surface. The runtime callback is emitted after registration for both dispositions; the focused OMP resume test verifies the shared binding is forwarded unchanged.
+- **Host inventory recovery:** Persisted membership hydrates as `unconfirmed`. Complete owner inventories re-admit matching live owners, restore canonical tab/leaf/handle metadata, clear stale hydration state, and retire only rows in the covered host scope that are absent. Incomplete inventories never retire absence; local and SSH scopes are reconciled independently.
+- **Lifecycle cleanup:** Failed/exited settlement removes membership without making persistence a user-action gate. Dismissal retains provider resume identity only and drops launch membership.
+- **Reader projections:** The facet is carried through agent-status IPC, renderer state, mobile/session-tab projections, `worktree ps`, and worktree activity rollups. Committed membership keeps a row visible while contributing neither Working nor permission status. Connected-PTY gating is bypassed only for a committed launch facet.
+
+The C5 dependency is the shared owner contract in `1d3783e091` (tree-equivalent to `22f80ab284`), with the accompanying handoff at `f167c637f0`. The implementation consumes `owner.statusBinding` and does not mint a competing run or attachment identity.
+
+## Judgments
+
+### Architecture fit
+
+**Fit: verified for the C10 boundary.** Admission is attached to the existing claimed-owner transaction and consumes its committed/adopted result. Membership is an orthogonal host fact, not a turn reducer, readiness claim, provider journal, or second reservation registry. Complete inventory coverage is required before absence retires a row, and bookkeeping errors do not block terminal creation or dismissal.
+
+### Functional correctness
+
+**Correctness: verified for the covered cases.** Focused tests cover silent admission, bare replay rejection, provider transition carry-forward, adoption, failed settlement, dismissal, persistence/hydration, complete versus incomplete inventory, host-scoped retirement, and the worktree rollup. The aggregate runtime suite covers the new post-registration callback and existing create/adopt paths. Remote contact loss remains uncertainty rather than process death.
+
+### Concrete precedent and deviations
+
+The inspected implementations consistently create a pre-execution membership record from the owning lifecycle, keep it separate from turn activity, and retire it from authoritative host inventory. Orca differs materially where it must: PTY agents can be on an SSH execution host, so client contact or a partial inventory cannot prove exit; and mixed-version readers receive a legacy `done`/boundary projection plus an optional membership facet instead of a new wire state. Those differences are deliberate and remain subject to the host replication and compatibility work owned by C7.
+
+### Validation
+
+- `pnpm tc:node`
+- `pnpm tc:web`
+- Focused launch/projection tests: 17 passed across 3 files; additional status/runtime regression set: 87 passed across 8 files.
+- Aggregate `src/main/runtime/orca-runtime.test.ts`: **1,268 passed, 1 skipped**.
+- `node config/scripts/check-changed-code-quality.mjs`: 0 new findings in all gates.
+- `git diff --check`: passed.
+
+## Remaining gaps
+
+- Provider hook delivery and readiness/receipt behavior for Cursor/OpenCode on Windows/WSL are not fixed by membership; those remain C4/C3 work.
+- Emitter attribution, subject-keyed status storage, manual/nested discovery, and full provider-alias reconciliation remain C5 work beyond the consumed owner binding.
+- Host composition, replica stream epochs/cursors, mixed-version/session-tab negotiation, and final reader cutover remain C7 work. This batch adds optional fields but does not claim the cross-version transport contract is complete.
+- Canonical turn/outcome reduction and lost completion/child recovery remain C1/C2 work; exact attachment execution observation remains C6 work.
+- A complete end-to-end daemon/SSH process fixture with a real provider is not included here; the owner inventory and runtime seams are covered with bounded unit fixtures. Remote absence remains `unverifiable` until the owning host answers.
+
+## Required sibling commits
+
+- C5 owner binding: `22f80ab284` (and handoff `f167c637f0`; consumed tree is `1d3783e091`).
+- C7 host-domain composition and negotiated replica publication before relying on the new facet across paired clients.
+- C3 readiness/command-receipt evidence, C4 provider delivery adapters, C6 exact-attachment observation, and C1/C2 shared lifecycle/recovery reducers for their respective follow-on cases.
+
+## Commit
+
+Pending local implementation commit.
diff --git a/src/main/agent-hooks/server-launch-membership.test.ts b/src/main/agent-hooks/server-launch-membership.test.ts
new file mode 100644
index 00000000000..339ca4c5f39
--- /dev/null
+++ b/src/main/agent-hooks/server-launch-membership.test.ts
@@ -0,0 +1,354 @@
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
+import { mkdtempSync, rmSync } from 'node:fs'
+import { tmpdir } from 'node:os'
+import { join } from 'node:path'
+import { AgentHookServer, _internals } from './server'
+import { PANE } from './server.test-fixtures'
+import { collectRuntimeWorktreePtyAgentSources } from '../runtime/runtime-worktree-pty-agent-sources'
+import { attachRuntimeWorktreeAgentRows } from '../runtime/runtime-worktree-agent-rows'
+import type { RuntimeWorktreePsSummary } from '../../shared/runtime-types'
+import type { AgentStatusLaunchBinding } from '../../shared/agent-status-launch-membership'
+import { makePaneKey } from '../../shared/stable-pane-id'
+
+const { getCohortAtEmitMock, trackMock } = vi.hoisted(() => ({
+  getCohortAtEmitMock: vi.fn(),
+  trackMock: vi.fn()
+}))
+
+vi.mock('../telemetry/client', () => ({ track: trackMock }))
+vi.mock('../telemetry/cohort-classifier', () => ({ getCohortAtEmit: getCohortAtEmitMock }))
+
+const binding: AgentStatusLaunchBinding = {
+  runId: 'run-1',
+  attachment: { executionId: 'execution-1' },
+  role: 'root'
+}
+const remotePane = makePaneKey('tab-remote', '22222222-2222-4222-8222-222222222222')
+const remoteBinding: AgentStatusLaunchBinding = {
+  runId: 'run-remote',
+  attachment: { executionId: 'execution-remote' },
+  role: 'root'
+}
+const owner = {
+  claim: {
+    digestVersion: 1 as const,
+    keyId: 'key',
+    identityDigest: 'a'.repeat(43),
+    worktreeScopeDigest: 'b'.repeat(43),
+    agent: 'codex' as const
+  },
+  generation: 'generation-1',
+  phase: 'live' as const,
+  ptyId: 'pty-owner',
+  surface: {
+    worktreeId: 'wt-1',
+    tabId: 'tab-1',
+    leafId: '11111111-1111-4111-8111-111111111111',
+    terminalHandle: `term_${'a'.repeat(32)}`
+  },
+  statusBinding: binding
+}
+
+beforeEach(() => {
+  _internals.resetCachesForTests()
+  getCohortAtEmitMock.mockReturnValue({})
+  trackMock.mockReset()
+})
+
+afterEach(() => {
+  vi.restoreAllMocks()
+})
+
+describe('host-owned launch membership', () => {
+  it('ignores a bare create-operation result without an owner status binding', () => {
+    const server = new AgentHookServer()
+    expect(
+      server.admitAgentSessionOwner({
+        owner: { id: 'pty-only', incarnationId: 'incarnation-only' },
+        paneKey: PANE,
+        connectionId: null,
+        terminalHandle: 'term-only',
+        agentType: 'codex',
+        disposition: 'created'
+      })
+    ).toBeNull()
+    expect(server.getStatusSnapshot()).toEqual([])
+  })
+
+  it('publishes a compatibility row before the first provider observation', () => {
+    const server = new AgentHookServer()
+    const listener = vi.fn()
+    server.subscribeEnrichedStatus(listener)
+
+    const admitted = server.admitAgentLaunch({
+      paneKey: PANE,
+      tabId: 'tab-1',
+      worktreeId: 'wt-1',
+      connectionId: null,
+      terminalHandle: 'term_launch',
+      agentType: 'codex',
+      launchToken: 'launch-secret',
+      binding,
+      disposition: 'created',
+      committedAt: 100
+    })
+
+    expect(admitted).toMatchObject({
+      paneKey: PANE,
+      payload: { state: 'done', sessionBoundary: true, agentType: 'codex' },
+      launchMembership: { binding, phase: 'committed', disposition: 'created' }
+    })
+    expect(listener).toHaveBeenCalledOnce()
+    expect(server.getStatusSnapshot()[0]).toMatchObject({
+      state: 'done',
+      sessionBoundary: true,
+      launchMembership: { binding, phase: 'committed' }
+    })
+  })
+
+  it('carries membership through a provider event without treating it as turn state', () => {
+    const server = new AgentHookServer()
+    server.admitAgentLaunch({
+      paneKey: PANE,
+      tabId: 'tab-1',
+      worktreeId: 'wt-1',
+      connectionId: 'conn-1',
+      terminalHandle: 'term_launch',
+      agentType: 'codex',
+      binding,
+      disposition: 'created',
+      committedAt: 100
+    })
+    server.ingestRemote(
+      {
+        paneKey: PANE,
+        tabId: 'tab-1',
+        worktreeId: 'wt-1',
+        payload: { state: 'working', prompt: 'hello', agentType: 'codex' }
+      },
+      'conn-1'
+    )
+
+    expect(server.getStatusSnapshot()[0]).toMatchObject({
+      state: 'working',
+      launchMembership: { binding, phase: 'committed' }
+    })
+  })
+
+  it('retires failed launches and permits dismissal even when persistence fails', () => {
+    const server = new AgentHookServer()
+    server.admitAgentLaunch({
+      paneKey: PANE,
+      connectionId: null,
+      terminalHandle: 'term_launch',
+      agentType: 'codex',
+      binding,
+      disposition: 'created',
+      committedAt: 100
+    })
+    expect(server.settleAgentLaunch(PANE, 'failed')).toBe(true)
+    expect(server.getStatusSnapshot()).toEqual([])
+  })
+
+  it('does not retire rows for an incomplete owner census', () => {
+    const server = new AgentHookServer()
+    server.admitAgentLaunch({
+      paneKey: PANE,
+      connectionId: null,
+      terminalHandle: 'term_launch',
+      agentType: 'codex',
+      binding,
+      disposition: 'created',
+      committedAt: 100
+    })
+
+    expect(server.reconcileAgentLaunchMembership([], { complete: false })).toEqual({
+      reAdmitted: 0,
+      retired: 0
+    })
+    expect(server.getStatusSnapshot()).toHaveLength(1)
+    expect(server.getStatusSnapshot()[0]?.launchMembership?.phase).toBe('committed')
+  })
+
+  it('reconciles only the execution host covered by a targeted inventory', () => {
+    const server = new AgentHookServer()
+    server.admitAgentLaunch({
+      paneKey: PANE,
+      connectionId: null,
+      terminalHandle: 'term-local',
+      agentType: 'codex',
+      binding,
+      disposition: 'created',
+      committedAt: 100
+    })
+    server.admitAgentLaunch({
+      paneKey: remotePane,
+      connectionId: 'conn-remote',
+      terminalHandle: 'term-remote',
+      agentType: 'codex',
+      binding: remoteBinding,
+      disposition: 'created',
+      committedAt: 100
+    })
+
+    expect(
+      server.reconcileAgentLaunchMembership([], { complete: true, connectionId: 'conn-remote' })
+    ).toEqual({ reAdmitted: 0, retired: 1 })
+    expect(server.getStatusSnapshot().map((entry) => entry.paneKey)).toEqual([PANE])
+    expect(
+      server.reconcileAgentLaunchMembership([], { complete: true, connectionId: null })
+    ).toEqual({ reAdmitted: 0, retired: 1 })
+    expect(server.getStatusSnapshot()).toEqual([])
+  })
+
+  it('drops launch membership when dismissal retains only provider resume identity', () => {
+    const server = new AgentHookServer()
+    server.admitAgentLaunch({
+      paneKey: PANE,
+      connectionId: null,
+      terminalHandle: 'term-launch',
+      agentType: 'codex',
+      binding,
+      disposition: 'created',
+      committedAt: 100
+    })
+    server.ingestRemote(
+      {
+        paneKey: PANE,
+        tabId: 'tab-1',
+        worktreeId: 'wt-1',
+        providerSession: { key: 'session_id', id: 'resume-me' },
+        payload: { state: 'working', prompt: 'continue', agentType: 'codex' }
+      },
+      null
+    )
+
+    server.dropStatusEntry(PANE)
+    expect(server.getStatusSnapshot()[0]).toMatchObject({
+      providerSessionOnly: true,
+      providerSession: { key: 'session_id', id: 'resume-me' }
+    })
+    expect(server.getStatusSnapshot()[0]).not.toHaveProperty('launchMembership')
+  })
+
+  it('marks a hydrated launch unconfirmed and re-admits only matching owners', async () => {
+    const userDataPath = mkdtempSync(join(tmpdir(), 'orca-launch-membership-'))
+    try {
+      const first = new AgentHookServer()
+      await first.start({ userDataPath, env: 'production' })
+      first.admitAgentLaunch({
+        paneKey: PANE,
+        tabId: 'tab-1',
+        worktreeId: 'wt-1',
+        connectionId: null,
+        terminalHandle: 'term_launch',
+        agentType: 'codex',
+        binding,
+        disposition: 'created',
+        committedAt: Date.now()
+      })
+      first.flushStatusPersistSync()
+      first.stop()
+
+      const second = new AgentHookServer()
+      await second.start({ userDataPath, env: 'production' })
+      expect(second.getStatusSnapshot()[0]?.launchMembership?.phase).toBe('unconfirmed')
+      expect(second.reconcileAgentLaunchMembership([owner])).toEqual({
+        reAdmitted: 1,
+        retired: 0
+      })
+      expect(second.getStatusSnapshot()[0]?.launchMembership?.phase).toBe('committed')
+      expect(second.getStatusSnapshot()[0]).toMatchObject({
+        terminalHandle: owner.surface.terminalHandle,
+        tabId: owner.surface.tabId,
+        worktreeId: owner.surface.worktreeId
+      })
+      second.stop()
+
+      const third = new AgentHookServer()
+      await third.start({ userDataPath, env: 'production' })
+      expect(third.reconcileAgentLaunchMembership([], { complete: true })).toEqual({
+        reAdmitted: 0,
+        retired: 1
+      })
+      expect(third.getStatusSnapshot()).toEqual([])
+      third.stop()
+    } finally {
+      rmSync(userDataPath, { recursive: true, force: true })
+    }
+  })
+})
+
+describe('launch membership worktree projection', () => {
+  it('shows host activity without permission or working rollups', () => {
+    const server = new AgentHookServer()
+    server.admitAgentLaunch({
+      paneKey: PANE,
+      tabId: 'tab-1',
+      worktreeId: 'wt-1',
+      connectionId: null,
+      terminalHandle: 'term_launch',
+      agentType: 'codex',
+      binding,
+      disposition: 'created',
+      committedAt: Date.now()
+    })
+    const sources = collectRuntimeWorktreePtyAgentSources({
+      hookSnapshots: server.getStatusSnapshot(),
+      mirroredWorktreeIdByTabId: new Map([['tab-1', 'wt-1']]),
+      connectedPtyEvidence: {
+        tabIds: new Set(),
+        paneKeys: new Set(),
+        ptyIdByTerminalHandle: new Map()
+      }
+    })
+    const summary: RuntimeWorktreePsSummary = {
+      worktreeId: 'wt-1',
+      repoId: 'repo-1',
+      repo: 'repo',
+      path: '/tmp/repo',
+      branch: 'main',
+      isArchived: false,
+      isMainWorktree: true,
+      hasHostSidebarActivity: false,
+      parentWorktreeId: null,
+      childWorktreeIds: [],
+      displayName: 'repo',
+      workspaceStatus: 'clean',
+      sortOrder: 0,
+      linkedIssue: null,
+      linkedPR: null,
+      linkedLinearIssue: null,
+      linkedGitLabMR: null,
+      linkedGitLabIssue: null,
+      comment: '',
+      isPinned: false,
+      isActive: false,
+      unread: false,
+      liveTerminalCount: 0,
+      hasAttachedPty: false,
+      lastOutputAt: null,
+      preview: '',
+      status: 'inactive',
+      agents: []
+    }
+    attachRuntimeWorktreeAgentRows({
+      summaries: new Map([['wt-1', summary]]),
+      pathIndex: {
+        platformByRepoId: new Map(),
+        posixAbsolute: new Map(),
+        posixRelative: new Map(),
+        windows: new Map(),
+        windowsAbsolute: new Map()
+      },
+      missingWorktreeIds: new Set(),
+      rowSources: new Map(sources.map((source) => [source.paneKey, source])),
+      workingTerminalEvidenceByWorktreeId: new Map(),
+      orchestrationByPaneKey: undefined,
+      getSummary: (summaries, _pathIndex, _missing, worktreeId) => summaries.get(worktreeId) ?? null
+    })
+    expect(summary.hasHostSidebarActivity).toBe(true)
+    expect(summary.status).toBe('inactive')
+    expect(summary.agents[0]?.launchMembership).toMatchObject({ phase: 'committed' })
+  })
+})
diff --git a/src/main/agent-hooks/server.ts b/src/main/agent-hooks/server.ts
index 3fb3f51f5f1..80ed81a89a3 100644
--- a/src/main/agent-hooks/server.ts
+++ b/src/main/agent-hooks/server.ts
@@ -16,6 +16,7 @@ export type {
   AgentHookStatusFreshnessObservation,
   EnrichedAgentHookEventPayload
 } from './server/server-types'
+export type { AgentLaunchAdmission, AgentLaunchSettlement } from './server/server-launch-membership'
 export type { AgentHookSource }
 export {
   CLOSED_AGENT_STATUS_TAB_IDS_MAX,
diff --git a/src/main/agent-hooks/server/server-cleanup.ts b/src/main/agent-hooks/server/server-cleanup.ts
index 9f36d676143..25f9e0ef3dd 100644
--- a/src/main/agent-hooks/server/server-cleanup.ts
+++ b/src/main/agent-hooks/server/server-cleanup.ts
@@ -17,7 +17,11 @@ export abstract class AgentHookServerCleanup extends AgentHookServerAuthorityFen
     ) {
       return null
     }
-    const { launchToken: _launchToken, ...resumeIdentity } = entry
+    const {
+      launchToken: _launchToken,
+      launchMembership: _launchMembership,
+      ...resumeIdentity
+    } = entry
     return { ...resumeIdentity, providerSessionOnly: true, retainedForLiveness: true }
   }
 
diff --git a/src/main/agent-hooks/server/server-hydration.ts b/src/main/agent-hooks/server/server-hydration.ts
index 70da93b7c3b..fd85ff1a001 100644
--- a/src/main/agent-hooks/server/server-hydration.ts
+++ b/src/main/agent-hooks/server/server-hydration.ts
@@ -100,6 +100,12 @@ export abstract class AgentHookServerHydration extends AgentHookServerReaping {
           // Why: the terminal transition may have fired while no receiver was up; restore as unconfirmed, never as live truth.
           entry.restoredUnconfirmed = true
         }
+        if (entry.launchMembership) {
+          // A persisted launch proves only that this host committed an execution in
+          // the prior runtime. The owner inventory must re-admit it before it is
+          // considered live again.
+          entry.launchMembership = { ...entry.launchMembership, phase: 'unconfirmed' }
+        }
         this.state.lastStatusByPaneKey.set(resolvedPaneKey, entry)
         if (entry.connectionId) {
           // Why: a restart can see an earlier wall clock; seed ordering so new events stay after disk state.
diff --git a/src/main/agent-hooks/server/server-ingest-remote.ts b/src/main/agent-hooks/server/server-ingest-remote.ts
index 7f2008114f1..d3f6e164e72 100644
--- a/src/main/agent-hooks/server/server-ingest-remote.ts
+++ b/src/main/agent-hooks/server/server-ingest-remote.ts
@@ -18,9 +18,9 @@ import { launchTokenHash } from '../../../shared/agent-hook-spool'
 import { parsePaneKey } from '../../../shared/stable-pane-id'
 import type { AgentHookEventPayload } from '../../../shared/agent-hook-listener/listener-event'
 import { isValidPiProviderSessionOnly } from './server-status-identity'
-import { AgentHookServerIngestStructured } from './server-ingest-structured'
+import { AgentHookServerLaunchMembership } from './server-launch-membership'
 
-export abstract class AgentHookServerIngestRemote extends AgentHookServerIngestStructured {
+export abstract class AgentHookServerIngestRemote extends AgentHookServerLaunchMembership {
   /** Ingest a payload from the relay JSON-RPC channel (not the local HTTP server); connectionId is stamped here. Main is still the SSH trust boundary, so re-run the canonical normalizer before caching. */
   ingestRemote(
     envelope: {
diff --git a/src/main/agent-hooks/server/server-launch-membership-payload.ts b/src/main/agent-hooks/server/server-launch-membership-payload.ts
new file mode 100644
index 00000000000..631117bea03
--- /dev/null
+++ b/src/main/agent-hooks/server/server-launch-membership-payload.ts
@@ -0,0 +1,44 @@
+import type { AgentHookEventPayload } from '../../../shared/agent-hook-listener/listener-event'
+import type { AgentStatusObservationOrigin } from '../../../shared/agent-status-observation'
+import type { EnrichedAgentHookEventPayload } from './server-types'
+
+/**
+ * Keep launch membership host-owned while carrying it across a verified terminal owner.
+ */
+export function prepareLaunchMembershipPayload(args: {
+  payload: AgentHookEventPayload
+  origin: AgentStatusObservationOrigin
+  previous?: EnrichedAgentHookEventPayload
+  sameTerminalOwner: (
+    previous: EnrichedAgentHookEventPayload,
+    incoming: Pick<AgentHookEventPayload, 'connectionId' | 'worktreeId'>
+  ) => boolean
+}): AgentHookEventPayload {
+  const { payload, origin, previous, sameTerminalOwner } = args
+  const { launchMembership: incomingLaunchMembership, ...payloadWithoutMembership } = payload
+  const launchOwnedPayload: AgentHookEventPayload =
+    origin === 'launch' && incomingLaunchMembership
+      ? { ...payloadWithoutMembership, launchMembership: incomingLaunchMembership }
+      : payloadWithoutMembership
+  const terminalHandle =
+    launchOwnedPayload.terminalHandle ??
+    (previous?.terminalHandle && sameTerminalOwner(previous, launchOwnedPayload)
+      ? previous.terminalHandle
+      : undefined)
+  const terminalOwnedPayload =
+    terminalHandle === launchOwnedPayload.terminalHandle
+      ? launchOwnedPayload
+      : { ...launchOwnedPayload, terminalHandle }
+  const carriedLaunchMembership =
+    terminalOwnedPayload.launchMembership ??
+    (previous &&
+    previous.launchMembership &&
+    previous.terminalHandle &&
+    terminalHandle === previous.terminalHandle &&
+    sameTerminalOwner(previous, terminalOwnedPayload)
+      ? previous.launchMembership
+      : undefined)
+  return carriedLaunchMembership
+    ? { ...terminalOwnedPayload, launchMembership: carriedLaunchMembership }
+    : terminalOwnedPayload
+}
diff --git a/src/main/agent-hooks/server/server-launch-membership.ts b/src/main/agent-hooks/server/server-launch-membership.ts
new file mode 100644
index 00000000000..3cf34a23804
--- /dev/null
+++ b/src/main/agent-hooks/server/server-launch-membership.ts
@@ -0,0 +1,293 @@
+import type { AgentType } from '../../../shared/agent-status-types'
+import type { AgentHookEventPayload } from '../../../shared/agent-hook-listener/listener-event'
+import {
+  isAgentSessionOwnerBinding,
+  type AgentSessionOwnerBinding
+} from '../../../shared/agent-session-host-authority'
+import {
+  launchMembershipsEqual,
+  parseAgentStatusLaunchBinding,
+  type AgentStatusLaunchBinding,
+  type AgentStatusLaunchMembership
+} from '../../../shared/agent-status-launch-membership'
+import { makePaneKey, parsePaneKey } from '../../../shared/stable-pane-id'
+import type { EnrichedAgentHookEventPayload } from './server-types'
+import { AgentHookServerIngestStructured } from './server-ingest-structured'
+
+export type AgentLaunchAdmission = {
+  paneKey: string
+  tabId?: string
+  worktreeId?: string
+  connectionId: string | null
+  terminalHandle?: string
+  agentType: AgentType
+  launchToken?: string
+  prompt?: string
+  binding: AgentStatusLaunchBinding
+  disposition: 'created' | 'adopted'
+  committedAt?: number
+}
+
+export type AgentLaunchSettlement = 'committed' | 'unconfirmed' | 'failed' | 'exited'
+
+function ownerStatusBinding(value: unknown): AgentStatusLaunchBinding | null {
+  if (typeof value !== 'object' || value === null || Array.isArray(value)) {
+    return null
+  }
+  return parseAgentStatusLaunchBinding(Reflect.get(value, 'statusBinding'))
+}
+
+function launchMembershipKey(binding: AgentStatusLaunchBinding): string {
+  return `${binding.runId}\u0000${binding.attachment.executionId}`
+}
+
+function readEnrichedStatus(
+  value: AgentHookEventPayload | undefined
+): EnrichedAgentHookEventPayload | undefined {
+  if (
+    !value ||
+    typeof value !== 'object' ||
+    !('receivedAt' in value) ||
+    typeof value.receivedAt !== 'number' ||
+    !('stateStartedAt' in value) ||
+    typeof value.stateStartedAt !== 'number'
+  ) {
+    return undefined
+  }
+  return { ...value, receivedAt: value.receivedAt, stateStartedAt: value.stateStartedAt }
+}
+
+export abstract class AgentHookServerLaunchMembership extends AgentHookServerIngestStructured {
+  private sameLaunchTerminalOwner(
+    existing: EnrichedAgentHookEventPayload,
+    incoming: Pick<AgentHookEventPayload, 'connectionId' | 'worktreeId' | 'terminalHandle'>
+  ): boolean {
+    return (
+      existing.terminalHandle !== undefined &&
+      incoming.terminalHandle !== undefined &&
+      existing.terminalHandle === incoming.terminalHandle &&
+      this.sameTerminalOwner(existing, incoming)
+    )
+  }
+
+  /**
+   * Admit a committed or adopted owner before provider output is available.
+   * The legacy `done + sessionBoundary` payload is a compatibility projection;
+   * consumers must use `launchMembership` to distinguish it from completion.
+   */
+  admitAgentLaunch(args: AgentLaunchAdmission): EnrichedAgentHookEventPayload | null {
+    if (!parsePaneKey(args.paneKey) || !parseAgentStatusLaunchBinding(args.binding)) {
+      return null
+    }
+    const committedAt = args.committedAt ?? Date.now()
+    if (!Number.isFinite(committedAt) || committedAt <= 0) {
+      return null
+    }
+    const membership: AgentStatusLaunchMembership = {
+      binding: args.binding,
+      disposition: args.disposition,
+      phase: 'committed',
+      committedAt
+    }
+    const previous = readEnrichedStatus(this.state.lastStatusByPaneKey.get(args.paneKey))
+    if (previous?.launchMembership) {
+      if (
+        !launchMembershipsEqual(previous.launchMembership, membership) ||
+        !this.sameLaunchTerminalOwner(previous, args)
+      ) {
+        return null
+      }
+      return this.replaceLaunchMembership(previous, membership, args.launchToken)
+    }
+    if (previous && !this.sameLaunchTerminalOwner(previous, args)) {
+      // A provider row with no terminal join is not safe to re-key from a launch.
+      // The host may still admit the owner later once the canonical surface is known.
+      return null
+    }
+    const event: AgentHookEventPayload = {
+      paneKey: args.paneKey,
+      tabId: args.tabId,
+      worktreeId: args.worktreeId,
+      connectionId: args.connectionId,
+      terminalHandle: args.terminalHandle,
+      launchToken: args.launchToken,
+      launchMembership: membership,
+      payload: {
+        state: 'done',
+        sessionBoundary: true,
+        prompt: args.prompt ?? '',
+        agentType: args.agentType
+      }
+    }
+    return this.applyNormalizedStatus(event, undefined, 'launch', committedAt)
+  }
+
+  /** Convenience seam for owner registries: C5's binding is the only identity source. */
+  admitAgentSessionOwner(args: {
+    owner: unknown
+    paneKey: string
+    tabId?: string
+    worktreeId?: string
+    connectionId: string | null
+    terminalHandle?: string
+    agentType: AgentType
+    launchToken?: string
+    prompt?: string
+    disposition: 'created' | 'adopted'
+    committedAt?: number
+  }): EnrichedAgentHookEventPayload | null {
+    if (!isAgentSessionOwnerBinding(args.owner)) {
+      return null
+    }
+    const binding = ownerStatusBinding(args.owner)
+    if (!binding) {
+      return null
+    }
+    return this.admitAgentLaunch({ ...args, binding })
+  }
+
+  /** Settle launch bookkeeping without making persistence success a user-action gate. */
+  settleAgentLaunch(paneKey: string, settlement: AgentLaunchSettlement): boolean {
+    const existing = readEnrichedStatus(this.state.lastStatusByPaneKey.get(paneKey))
+    if (!existing?.launchMembership) {
+      return false
+    }
+    if (settlement === 'failed' || settlement === 'exited') {
+      const deleted = this.deleteStatusEntry(paneKey, { preserveAuthority: true })
+      if (!deleted) {
+        return false
+      }
+      this.commitStatusRowMutation(deleted, undefined)
+      this.scheduleStatusPersist()
+      this.notifyStatusChangeListeners()
+      this.emitStatusDropped(deleted.paneKey)
+      return true
+    }
+    const phase = settlement === 'committed' ? 'committed' : 'unconfirmed'
+    if (existing.launchMembership.phase === phase) {
+      return false
+    }
+    this.replaceLaunchMembership(existing, { ...existing.launchMembership, phase })
+    return true
+  }
+
+  /**
+   * Reconcile hydrated launch rows against owner inventory. Positive owner
+   * matches re-admit immediately; an incomplete inventory cannot retire absence.
+   */
+  reconcileAgentLaunchMembership(
+    owners: readonly unknown[],
+    options: { complete: boolean; connectionId?: string | null } = { complete: true }
+  ): { reAdmitted: number; retired: number } {
+    const admitted = new Map<string, AgentSessionOwnerBinding>()
+    for (const candidate of owners) {
+      const binding = ownerStatusBinding(candidate)
+      if (binding && isAgentSessionOwnerBinding(candidate)) {
+        admitted.set(launchMembershipKey(binding), candidate)
+      }
+    }
+    let reAdmitted = 0
+    let retired = 0
+    let changed = false
+    for (const [paneKey, rawEntry] of this.state.lastStatusByPaneKey) {
+      const entry = readEnrichedStatus(rawEntry)
+      if (!entry) {
+        continue
+      }
+      const membership = entry.launchMembership
+      if (!membership) {
+        continue
+      }
+      const inScope =
+        options.connectionId === undefined || (entry.connectionId ?? null) === options.connectionId
+      if (!inScope) {
+        continue
+      }
+      const owner = admitted.get(launchMembershipKey(membership.binding))
+      if (owner !== undefined) {
+        const canonicalPaneKey = makePaneKey(owner.surface.tabId, owner.surface.leafId)
+        let currentPaneKey = paneKey
+        let currentEntry = entry
+        if (canonicalPaneKey !== paneKey) {
+          if (this.state.lastStatusByPaneKey.has(canonicalPaneKey)) {
+            // A complete owner inventory proves the surface, but cannot authorize
+            // overwriting another row already occupying it.
+            continue
+          }
+          this.transferPaneAuthority(paneKey, canonicalPaneKey, owner.ptyId, Date.now(), {
+            authorityVerified: true
+          })
+          currentPaneKey = canonicalPaneKey
+          const movedEntry = readEnrichedStatus(
+            this.state.lastStatusByPaneKey.get(canonicalPaneKey)
+          )
+          if (!movedEntry) {
+            continue
+          }
+          currentEntry = movedEntry
+        }
+        const surfaceChanged =
+          currentEntry.terminalHandle !== owner.surface.terminalHandle ||
+          currentEntry.tabId !== owner.surface.tabId ||
+          currentEntry.worktreeId !== owner.surface.worktreeId
+        if (
+          membership.phase !== 'committed' ||
+          surfaceChanged ||
+          currentEntry.restoredUnconfirmed
+        ) {
+          const { restoredUnconfirmed: _restoredUnconfirmed, ...currentEntryWithoutRestore } =
+            currentEntry
+          const updated = {
+            ...currentEntryWithoutRestore,
+            paneKey: currentPaneKey,
+            tabId: owner.surface.tabId,
+            worktreeId: owner.surface.worktreeId,
+            terminalHandle: owner.surface.terminalHandle,
+            launchMembership: { ...membership, phase: 'committed' as const }
+          }
+          this.state.lastStatusByPaneKey.set(currentPaneKey, updated)
+          this.commitStatusRowMutation(currentEntry, updated)
+          this.emitEnrichedStatus(updated)
+          if (membership.phase !== 'committed') {
+            reAdmitted += 1
+          }
+          changed = true
+        }
+        continue
+      }
+      if (!options.complete) {
+        continue
+      }
+      const deleted = this.deleteStatusEntry(paneKey, { preserveAuthority: true })
+      if (deleted) {
+        this.commitStatusRowMutation(deleted, undefined, false)
+        this.emitStatusDropped(paneKey)
+        retired += 1
+        changed = true
+      }
+    }
+    if (changed) {
+      this.scheduleStatusPersist()
+      this.notifyStatusChangeListeners()
+    }
+    return { reAdmitted, retired }
+  }
+
+  private replaceLaunchMembership(
+    existing: EnrichedAgentHookEventPayload,
+    launchMembership: AgentStatusLaunchMembership,
+    launchToken?: string
+  ): EnrichedAgentHookEventPayload {
+    const updated: EnrichedAgentHookEventPayload = {
+      ...existing,
+      ...(launchToken ? { launchToken } : {}),
+      launchMembership
+    }
+    this.state.lastStatusByPaneKey.set(existing.paneKey, updated)
+    this.commitStatusRowMutation(existing, updated)
+    this.scheduleStatusPersist()
+    this.notifyStatusChangeListeners()
+    this.emitEnrichedStatus(updated)
+    return updated
+  }
+}
diff --git a/src/main/agent-hooks/server/server-persistence-validation.ts b/src/main/agent-hooks/server/server-persistence-validation.ts
index d47fe0cddeb..6afd55bad29 100644
--- a/src/main/agent-hooks/server/server-persistence-validation.ts
+++ b/src/main/agent-hooks/server/server-persistence-validation.ts
@@ -13,6 +13,7 @@ import {
 import { parsePaneKey } from '../../../shared/stable-pane-id'
 import type { AgentHookAuthorityEvidence, EnrichedAgentHookEventPayload } from './server-types'
 import { isValidPaneKey, isValidPiProviderSessionOnly } from './server-status-identity'
+import { parseAgentStatusLaunchMembership } from '../../../shared/agent-status-launch-membership'
 
 export function dropHydratedIdleClaudeSubagents(
   payload: ParsedAgentStatusPayload
@@ -91,6 +92,13 @@ export function sanitizeHydratedEntry(
   const providerSession = normalizeAgentProviderSession(record.providerSession) ?? undefined
   const providerSessionOnly = record.providerSessionOnly === true
   const retainedForLiveness = record.retainedForLiveness === true
+  const launchMembership =
+    record.launchMembership === undefined
+      ? undefined
+      : parseAgentStatusLaunchMembership(record.launchMembership)
+  if (record.launchMembership !== undefined && !launchMembership) {
+    return null
+  }
   const validRetainedIdentity = Boolean(
     retainedForLiveness && providerSession && payload.agentType && payload.agentType !== 'unknown'
   )
@@ -131,6 +139,7 @@ export function sanitizeHydratedEntry(
     providerSession,
     providerSessionOnly: providerSessionOnly ? true : undefined,
     retainedForLiveness: retainedForLiveness ? true : undefined,
+    ...(launchMembership ? { launchMembership } : {}),
     payload,
     receivedAt,
     stateStartedAt
diff --git a/src/main/agent-hooks/server/server-status-identity.ts b/src/main/agent-hooks/server/server-status-identity.ts
index 1694c4b1b67..7327f58459a 100644
--- a/src/main/agent-hooks/server/server-status-identity.ts
+++ b/src/main/agent-hooks/server/server-status-identity.ts
@@ -70,6 +70,7 @@ export function toAgentStatusIpcPayload(
     ...(entry.observation ? { observation: entry.observation } : {}),
     ...(entry.structuredHost ? { structuredHost: entry.structuredHost } : {}),
     ...(entry.terminalHandle ? { terminalHandle: entry.terminalHandle } : {}),
+    ...(entry.launchMembership ? { launchMembership: entry.launchMembership } : {}),
     ...entry.payload
   }
 }
diff --git a/src/main/agent-hooks/server/server-status-update.ts b/src/main/agent-hooks/server/server-status-update.ts
index fb165ce1c83..d6ecdb93db8 100644
--- a/src/main/agent-hooks/server/server-status-update.ts
+++ b/src/main/agent-hooks/server/server-status-update.ts
@@ -19,6 +19,7 @@ import {
 import { isStaleGrokTurnEnd } from './server-grok-status-rules'
 import { isToolProgressWorkingAfterInterrupt } from './server-status-identity'
 import { AgentHookServerStatusApplication } from './server-status-application'
+import { prepareLaunchMembershipPayload } from './server-launch-membership-payload'
 
 export abstract class AgentHookServerStatusUpdate extends AgentHookServerStatusApplication {
   protected applyNormalizedStatus(
@@ -36,20 +37,19 @@ export abstract class AgentHookServerStatusUpdate extends AgentHookServerStatusA
       | EnrichedAgentHookEventPayload
       | undefined
     const rowBefore = mutationBefore ?? previous
-    const terminalHandle =
-      payload.terminalHandle ??
-      (previous?.terminalHandle && this.sameTerminalOwner(previous, payload)
-        ? previous.terminalHandle
-        : undefined)
-    const terminalOwnedPayload =
-      terminalHandle === payload.terminalHandle ? payload : { ...payload, terminalHandle }
-    if (previous && isStaleGrokTurnEnd(previous, terminalOwnedPayload)) {
+    const membershipOwnedPayload = prepareLaunchMembershipPayload({
+      payload,
+      origin,
+      previous,
+      sameTerminalOwner: (existing, incoming) => this.sameTerminalOwner(existing, incoming)
+    })
+    if (previous && isStaleGrokTurnEnd(previous, membershipOwnedPayload)) {
       // Why: Grok turn-end hooks may arrive after the next prompt, including across relay restart.
       this.commitStatusRowMutation(rowBefore, previous)
       return previous
     }
-    const connectionClearWatermark = terminalOwnedPayload.connectionId
-      ? this.connectionTimestampWatermarkById.get(terminalOwnedPayload.connectionId)
+    const connectionClearWatermark = membershipOwnedPayload.connectionId
+      ? this.connectionTimestampWatermarkById.get(membershipOwnedPayload.connectionId)
       : undefined
     // Why: renderer ordering rejects older rows; live evidence must sort after reconnect clears and restored rows across clock rollback.
     const restoredStatusWatermark = previous?.restoredUnconfirmed ? previous.receivedAt : undefined
@@ -58,15 +58,15 @@ export abstract class AgentHookServerStatusUpdate extends AgentHookServerStatusA
       (connectionClearWatermark ?? -1) + 1,
       (restoredStatusWatermark ?? -1) + 1
     )
-    if (terminalOwnedPayload.connectionId) {
-      this.connectionTimestampWatermarkById.set(terminalOwnedPayload.connectionId, now)
+    if (membershipOwnedPayload.connectionId) {
+      this.connectionTimestampWatermarkById.set(membershipOwnedPayload.connectionId, now)
     }
-    if (terminalOwnedPayload.providerSessionOnly) {
+    if (membershipOwnedPayload.providerSessionOnly) {
       // Why: identity-only rows survive replay but must not emit prompt telemetry or a fabricated status.
       onAccepted?.()
       const enriched = {
-        ...this.attachStatusTiming(terminalOwnedPayload, now),
-        observation: this.stampObservation(terminalOwnedPayload, origin, now)
+        ...this.attachStatusTiming(membershipOwnedPayload, now),
+        observation: this.stampObservation(membershipOwnedPayload, origin, now)
       }
       this.clearAssistantMessageRetry(enriched.paneKey)
       this.runtimeObservedStatusPaneKeys.delete(enriched.paneKey)
@@ -78,21 +78,21 @@ export abstract class AgentHookServerStatusUpdate extends AgentHookServerStatusA
       return enriched
     }
     const stateReconciledPayload =
-      terminalOwnedPayload.connectionId &&
-      terminalOwnedPayload.payload.agentType === 'codex' &&
-      terminalOwnedPayload.hookEventName
+      membershipOwnedPayload.connectionId &&
+      membershipOwnedPayload.payload.agentType === 'codex' &&
+      membershipOwnedPayload.hookEventName
         ? {
-            ...terminalOwnedPayload,
+            ...membershipOwnedPayload,
             payload: reconcileRemoteCodexState(
               this.state,
-              terminalOwnedPayload.paneKey,
-              terminalOwnedPayload.hookEventName,
-              terminalOwnedPayload.toolAgentId,
-              terminalOwnedPayload.payload,
+              membershipOwnedPayload.paneKey,
+              membershipOwnedPayload.hookEventName,
+              membershipOwnedPayload.toolAgentId,
+              membershipOwnedPayload.payload,
               previous?.payload
             )
           }
-        : terminalOwnedPayload
+        : membershipOwnedPayload
     const previousCodexRoot =
       stateReconciledPayload.payload.agentType === 'codex' &&
       stateReconciledPayload.toolAgentId &&
diff --git a/src/main/agent-hooks/server/server-types.ts b/src/main/agent-hooks/server/server-types.ts
index b4cf176b176..60876699f89 100644
--- a/src/main/agent-hooks/server/server-types.ts
+++ b/src/main/agent-hooks/server/server-types.ts
@@ -7,6 +7,7 @@ import type {
 import type { AgentStatusObservation } from '../../../shared/agent-status-observation'
 import type { AgentKind } from '../../../shared/telemetry-events'
 import type { LegacyPaneKeyAliasEntry } from '../../../shared/persisted-state-types'
+import type { AgentStatusLaunchMembership } from '../../../shared/agent-status-launch-membership'
 
 // Why: server-side enrichment — receivedAt = latest event arrival, stateStartedAt = when the current state first appeared; extra fields ride the shared map untouched (it only writes/clears).
 export type EnrichedAgentHookEventPayload = AgentHookEventPayload & {
@@ -25,6 +26,8 @@ export type EnrichedAgentHookEventPayload = AgentHookEventPayload & {
   retainedForLiveness?: true
   /** Persisted proof that a lead boundary was held working only by child agents. */
   claudeLeadBoundaryChildOnly?: true
+  /** Host-owned launch/adoption membership. This facet is not a turn or readiness claim. */
+  launchMembership?: AgentStatusLaunchMembership
 }
 
 export type PersistedAgentHookEventPayload = Omit<
diff --git a/src/main/orcad/orcad-entry.ts b/src/main/orcad/orcad-entry.ts
index 3dc84906c99..3a03febcd75 100644
--- a/src/main/orcad/orcad-entry.ts
+++ b/src/main/orcad/orcad-entry.ts
@@ -225,6 +225,27 @@ async function startOrcadRuntime(
     // PTY agent on this host, and the store is the only place `worktree.ps` and the mobile
     // projection read from — unwired, orcad lists no PTY agents at all.
     onTerminalAgentStatus: (event) => agentHookServer.ingestTerminalStatus(event),
+    onAgentSessionCommitted: (commit) => {
+      agentHookServer.admitAgentSessionOwner({
+        owner: commit.result.owner,
+        paneKey: commit.paneKey,
+        tabId: commit.tabId,
+        worktreeId: commit.worktreeId,
+        connectionId: commit.connectionId,
+        terminalHandle: commit.result.owner.surface.terminalHandle,
+        agentType: commit.agentType ?? commit.result.owner.claim.agent,
+        launchToken: commit.launchToken,
+        disposition: commit.result.disposition
+      })
+    },
+    onAgentSessionInventoryReconciled: (reconciliation) => {
+      agentHookServer.reconcileAgentLaunchMembership(reconciliation.owners, {
+        complete: reconciliation.complete,
+        ...(reconciliation.connectionId !== undefined
+          ? { connectionId: reconciliation.connectionId }
+          : {})
+      })
+    },
     // Why here too and not only on the desktop: orcad serves `worktree.ps` and `agentSession.*`,
     // so without these a headless host publishes its structured chats nowhere and lists no agents.
     getAgentStatusSnapshot: () =>
diff --git a/src/main/runtime/orca-runtime-create-terminal.ts b/src/main/runtime/orca-runtime-create-terminal.ts
index ec8a3e78941..26a5b8d0c6c 100644
--- a/src/main/runtime/orca-runtime-create-terminal.ts
+++ b/src/main/runtime/orca-runtime-create-terminal.ts
@@ -4,6 +4,7 @@ import * as dependencies from './orca-runtime-create-terminal-dependencies'
 import { createDesktopTerminal } from './orca-runtime-create-terminal-desktop'
 import { buildRuntimeAgentTeamsLaunchPlan } from './orca-runtime-agent-teams-launch-plan'
 import { createPtySpawnCommitReporter } from './orca-runtime-report-pty-spawn-commit'
+import { finalizeBackgroundTerminalCreate } from './orca-runtime-finalize-background-terminal'
 
 export class OrcaRuntimeWithCreateTerminal extends OrcaRuntimeWithTerminalCreateDeduplication {
   async createTerminal(
@@ -175,123 +176,21 @@ export class OrcaRuntimeWithCreateTerminal extends OrcaRuntimeWithTerminalCreate
         } finally {
           releaseStablePaneCreate?.()
         }
-        if (!result.stablePaneOwner) {
-          reportPtySpawnCommitted()
-        }
-        const adoptedStablePane = Boolean(result.stablePaneOwner)
-        if (result.agentSessionEnsure) {
-          const canonicalSurface = result.agentSessionEnsure.owner.surface
-          preAllocatedHandle = canonicalSurface.terminalHandle
-          tabId = canonicalSurface.tabId
-          leafId = canonicalSurface.leafId
-          paneKey = dependencies.makePaneKey(tabId, leafId)
-        } else if (result.stablePaneOwner) {
-          preAllocatedHandle = result.stablePaneOwner.handle
-          tabId = result.stablePaneOwner.tabId
-          leafId = result.stablePaneOwner.leafId
-          paneKey = dependencies.makePaneKey(tabId, leafId)
-        }
-        try {
-          this.assertPtyDidNotExitBeforeRegistration(result.id, result.incarnationId)
-        } catch (error) {
-          if (error instanceof Error && error.message === 'agent_session_exited_during_start') {
-            this.releaseRejectedPtyRegistrationFence(result.id, result.incarnationId)
-          }
-          throw error
-        }
-        this.registerPreAllocatedHandleForPty(result.id, preAllocatedHandle)
-        if (result.wslDistro) {
-          this.preparePtyExecutionContext(result.id, result.wslDistro)
-        }
-        this.registerPty(result.id, workspace.id, workspace.connectionId, {
+        return finalizeBackgroundTerminalCreate(this, {
+          result,
+          workspace,
+          launchOpts,
+          presentation,
+          cwd,
+          preAllocatedHandle,
           tabId,
           leafId,
-          terminalHandle: preAllocatedHandle,
-          ...(result.incarnationId ? { incarnationId: result.incarnationId } : {})
-        })
-        if (launchOpts.structuredAgentSessionId) {
-          dependencies.agentSessionPtyWriteGate.bindPty(
-            result.id,
-            launchOpts.structuredAgentSessionId
-          )
-        }
-        const pty = this.getOrCreatePtyWorktreeRecord(result.id)
-        if (pty) {
-          pty.runtimeSessionOwned = true
-          if (!adoptedStablePane) {
-            if (launchOpts.title) {
-              const observedAt = this.nextTitleObservationSequence()
-              pty.title = launchOpts.title
-              pty.titleUpdatedAt = observedAt
-              this.setPtyManagementTitleFromObservedTitle(pty, launchOpts.title, observedAt)
-            } else {
-              pty.title = null
-              pty.titleUpdatedAt = null
-            }
-            pty.launchConfig = effectiveLaunchConfig
-              ? dependencies.copySleepingAgentLaunchConfig(effectiveLaunchConfig)
-              : null
-            pty.launchToken = launchToken ?? null
-            pty.launchIncarnationId = launchToken ? pty.incarnationId : null
-            pty.launchAgent = launchOpts.launchAgent ?? null
-          }
-          pty.tabId = tabId
-          pty.paneKey = paneKey
-        }
-        const handle = pty ? this.issuePtyHandle(pty) : preAllocatedHandle
-        if (pty && !adoptedStablePane && launchOpts.deferMobileSessionPublish !== true) {
-          this.publishPtyBackedMobileSessionTerminal(workspace.id, pty, {
-            tabId,
-            leafId,
-            title: launchOpts.title ?? null,
-            activate: presentation === 'focused',
-            selectIfNoActiveTab: presentation !== 'background',
-            ...(launchOpts.viewMode ? { viewMode: launchOpts.viewMode } : {}),
-            ...(cwd !== workspace.path ? { startupCwd: cwd } : {})
-          })
-        }
-        let surface: dependencies.RuntimeTerminalCreate['surface'] = 'background'
-        let warning: string | undefined
-        if (presentation !== 'background' && this.notifier?.revealTerminalSession) {
-          try {
-            await this.notifier.revealTerminalSession(workspace.id, {
-              ptyId: result.id,
-              title: launchOpts.title ?? null,
-              ...(cwd !== workspace.path ? { cwd } : {}),
-              ...(effectiveLaunchConfig ? { launchConfig: effectiveLaunchConfig } : {}),
-              ...(launchToken ? { launchToken } : {}),
-              ...(launchOpts.launchAgent ? { launchAgent: launchOpts.launchAgent } : {}),
-              ...(launchOpts.viewMode ? { viewMode: launchOpts.viewMode } : {}),
-              activate: presentation === 'focused',
-              ...(presentation ? { presentation } : {}),
-              ...dependencies.ownerSurfacing(opts.surfaceOwner !== false),
-              tabId,
-              leafId
-            })
-            surface = 'visible'
-          } catch (err) {
-            console.warn(`[terminal-create] failed to create inactive tab for ${result.id}:`, err)
-            warning = dependencies.createTerminalRevealWarning(handle, err)
-          }
-        } else if (presentation !== 'background') {
-          warning = dependencies.createTerminalRevealWarning(handle)
-        }
-        return {
-          handle,
-          tabId,
           paneKey,
-          ptyId: result.id,
-          worktreeId: workspace.id,
-          title: pty?.title ?? launchOpts.title ?? null,
-          ...this.getPtyExecutionHostMetadata(result.id),
-          surface,
-          ...(result.pid ? { processId: result.pid } : {}),
-          ...(result.agentSessionEnsure
-            ? { agentSessionDisposition: result.agentSessionEnsure.disposition }
-            : {}),
-          ...(adoptedStablePane ? { isReattach: true as const } : {}),
-          ...(warning ? { warning } : {})
-        }
+          launchToken,
+          effectiveLaunchConfig,
+          reportPtySpawnCommitted,
+          surfaceOwner: opts.surfaceOwner
+        })
       } finally {
         releaseStablePaneCreate()
       }
diff --git a/src/main/runtime/orca-runtime-finalize-background-terminal.ts b/src/main/runtime/orca-runtime-finalize-background-terminal.ts
new file mode 100644
index 00000000000..830c5f97371
--- /dev/null
+++ b/src/main/runtime/orca-runtime-finalize-background-terminal.ts
@@ -0,0 +1,172 @@
+// @ts-nocheck -- mechanically split from OrcaRuntimeService; behavior is covered by characterization tests.
+import * as dependencies from './orca-runtime-create-terminal-dependencies'
+import type { OrcaRuntimeWithCreateTerminal } from './orca-runtime-create-terminal'
+import type { RuntimeTerminalPresentation } from '../../shared/runtime-types'
+import type { SleepingAgentLaunchConfig } from '../../shared/agent-session-resume'
+
+export async function finalizeBackgroundTerminalCreate(
+  runtime: OrcaRuntimeWithCreateTerminal,
+  args: {
+    result: Awaited<ReturnType<NonNullable<dependencies.RuntimePtyController['spawn']>>>
+    workspace: Awaited<
+      ReturnType<OrcaRuntimeWithCreateTerminal['resolveTerminalWorkspaceLaunchScope']>
+    >
+    launchOpts: Awaited<
+      ReturnType<OrcaRuntimeWithCreateTerminal['resolveAgentTerminalCreateOptions']>
+    >
+    presentation: RuntimeTerminalPresentation | undefined
+    cwd: string
+    preAllocatedHandle: string
+    tabId: string
+    leafId: string
+    paneKey: string
+    launchToken: string | undefined
+    effectiveLaunchConfig: SleepingAgentLaunchConfig | undefined
+    reportPtySpawnCommitted: () => void
+    surfaceOwner?: boolean
+  }
+): Promise<dependencies.RuntimeTerminalCreate> {
+  const {
+    result,
+    workspace,
+    launchOpts,
+    presentation,
+    cwd,
+    launchToken,
+    effectiveLaunchConfig,
+    reportPtySpawnCommitted,
+    surfaceOwner
+  } = args
+  let { preAllocatedHandle, tabId, leafId, paneKey } = args
+  if (!result.stablePaneOwner) {
+    reportPtySpawnCommitted()
+  }
+  const adoptedStablePane = Boolean(result.stablePaneOwner)
+  if (result.agentSessionEnsure) {
+    const canonicalSurface = result.agentSessionEnsure.owner.surface
+    preAllocatedHandle = canonicalSurface.terminalHandle
+    tabId = canonicalSurface.tabId
+    leafId = canonicalSurface.leafId
+    paneKey = dependencies.makePaneKey(tabId, leafId)
+  } else if (result.stablePaneOwner) {
+    preAllocatedHandle = result.stablePaneOwner.handle
+    tabId = result.stablePaneOwner.tabId
+    leafId = result.stablePaneOwner.leafId
+    paneKey = dependencies.makePaneKey(tabId, leafId)
+  }
+  try {
+    runtime.assertPtyDidNotExitBeforeRegistration(result.id, result.incarnationId)
+  } catch (error) {
+    if (error instanceof Error && error.message === 'agent_session_exited_during_start') {
+      runtime.releaseRejectedPtyRegistrationFence(result.id, result.incarnationId)
+    }
+    throw error
+  }
+  runtime.registerPreAllocatedHandleForPty(result.id, preAllocatedHandle)
+  if (result.wslDistro) {
+    runtime.preparePtyExecutionContext(result.id, result.wslDistro)
+  }
+  runtime.registerPty(result.id, workspace.id, workspace.connectionId, {
+    tabId,
+    leafId,
+    terminalHandle: preAllocatedHandle,
+    ...(result.incarnationId ? { incarnationId: result.incarnationId } : {})
+  })
+  if (result.agentSessionEnsure && runtime.onAgentSessionCommitted) {
+    try {
+      runtime.onAgentSessionCommitted({
+        result: result.agentSessionEnsure,
+        paneKey,
+        tabId,
+        leafId,
+        worktreeId: workspace.id,
+        connectionId: workspace.connectionId,
+        launchToken,
+        agentType: launchOpts.launchAgent ?? result.agentSessionEnsure.owner.claim.agent
+      })
+    } catch (error) {
+      // Membership is bookkeeping. A failed status publication must never turn a committed execution into a failed terminal create.
+      console.warn('[terminal-create] launch membership publication failed:', error)
+    }
+  }
+  if (launchOpts.structuredAgentSessionId) {
+    dependencies.agentSessionPtyWriteGate.bindPty(result.id, launchOpts.structuredAgentSessionId)
+  }
+  const pty = runtime.getOrCreatePtyWorktreeRecord(result.id)
+  if (pty) {
+    pty.runtimeSessionOwned = true
+    if (!adoptedStablePane) {
+      if (launchOpts.title) {
+        const observedAt = runtime.nextTitleObservationSequence()
+        pty.title = launchOpts.title
+        pty.titleUpdatedAt = observedAt
+        runtime.setPtyManagementTitleFromObservedTitle(pty, launchOpts.title, observedAt)
+      } else {
+        pty.title = null
+        pty.titleUpdatedAt = null
+      }
+      pty.launchConfig = effectiveLaunchConfig
+        ? dependencies.copySleepingAgentLaunchConfig(effectiveLaunchConfig)
+        : null
+      pty.launchToken = launchToken ?? null
+      pty.launchIncarnationId = launchToken ? pty.incarnationId : null
+      pty.launchAgent = launchOpts.launchAgent ?? null
+    }
+    pty.tabId = tabId
+    pty.paneKey = paneKey
+  }
+  const handle = pty ? runtime.issuePtyHandle(pty) : preAllocatedHandle
+  if (pty && !adoptedStablePane && launchOpts.deferMobileSessionPublish !== true) {
+    runtime.publishPtyBackedMobileSessionTerminal(workspace.id, pty, {
+      tabId,
+      leafId,
+      title: launchOpts.title ?? null,
+      activate: presentation === 'focused',
+      selectIfNoActiveTab: presentation !== 'background',
+      ...(launchOpts.viewMode ? { viewMode: launchOpts.viewMode } : {}),
+      ...(cwd !== workspace.path ? { startupCwd: cwd } : {})
+    })
+  }
+  let surface: dependencies.RuntimeTerminalCreate['surface'] = 'background'
+  let warning: string | undefined
+  if (presentation !== 'background' && runtime.notifier?.revealTerminalSession) {
+    try {
+      await runtime.notifier.revealTerminalSession(workspace.id, {
+        ptyId: result.id,
+        title: launchOpts.title ?? null,
+        ...(cwd !== workspace.path ? { cwd } : {}),
+        ...(effectiveLaunchConfig ? { launchConfig: effectiveLaunchConfig } : {}),
+        ...(launchToken ? { launchToken } : {}),
+        ...(launchOpts.launchAgent ? { launchAgent: launchOpts.launchAgent } : {}),
+        ...(launchOpts.viewMode ? { viewMode: launchOpts.viewMode } : {}),
+        activate: presentation === 'focused',
+        ...(presentation ? { presentation } : {}),
+        ...dependencies.ownerSurfacing(surfaceOwner !== false),
+        tabId,
+        leafId
+      })
+      surface = 'visible'
+    } catch (err) {
+      console.warn(`[terminal-create] failed to create inactive tab for ${result.id}:`, err)
+      warning = dependencies.createTerminalRevealWarning(handle, err)
+    }
+  } else if (presentation !== 'background') {
+    warning = dependencies.createTerminalRevealWarning(handle)
+  }
+  return {
+    handle,
+    tabId,
+    paneKey,
+    ptyId: result.id,
+    worktreeId: workspace.id,
+    title: pty?.title ?? launchOpts.title ?? null,
+    ...runtime.getPtyExecutionHostMetadata(result.id),
+    surface,
+    ...(result.pid ? { processId: result.pid } : {}),
+    ...(result.agentSessionEnsure
+      ? { agentSessionDisposition: result.agentSessionEnsure.disposition }
+      : {}),
+    ...(adoptedStablePane ? { isReattach: true as const } : {}),
+    ...(warning ? { warning } : {})
+  }
+}
diff --git a/src/main/runtime/orca-runtime-preserved-branch-cleanup.ts b/src/main/runtime/orca-runtime-preserved-branch-cleanup.ts
index 33b4ace7772..a480e599ef0 100644
--- a/src/main/runtime/orca-runtime-preserved-branch-cleanup.ts
+++ b/src/main/runtime/orca-runtime-preserved-branch-cleanup.ts
@@ -6,6 +6,8 @@ import type {
   AgentSessionCreateOperation,
   OrchestrationCompatibilitySshAttachmentAuthority,
   RestoredOrchestrationAuthorityReceipt,
+  RuntimeAgentSessionCommit,
+  RuntimeAgentSessionInventoryReconciliation,
   RuntimeTerminalAgentStatusEvent
 } from './runtime-terminal-contracts'
 import type { TerminalSideEffectBatch } from '../../shared/terminal-side-effect-facts'
@@ -59,6 +61,14 @@ export class OrcaRuntimeWithPreservedBranchCleanup extends OrcaRuntimeWithTermin
     | ((event: RuntimeTerminalAgentStatusEvent) => void)
     | null
 
+  /** C10 admission callback; bookkeeping failures never gate terminal creation. */
+  protected readonly onAgentSessionCommitted: ((commit: RuntimeAgentSessionCommit) => void) | null
+
+  /** Complete owner inventories are the only restart-retirement authority. */
+  protected readonly onAgentSessionInventoryReconciled:
+    | ((reconciliation: RuntimeAgentSessionInventoryReconciliation) => void)
+    | null
+
   protected readonly onTerminalSideEffects: ((batch: TerminalSideEffectBatch) => void) | null
 
   protected terminalSideEffectLocalConsumerAvailable = false
diff --git a/src/main/runtime/orca-runtime-refresh-pty-worktree-records-with-controller-inventory.ts b/src/main/runtime/orca-runtime-refresh-pty-worktree-records-with-controller-inventory.ts
index aca67f67ba2..1589ee9cc1b 100644
--- a/src/main/runtime/orca-runtime-refresh-pty-worktree-records-with-controller-inventory.ts
+++ b/src/main/runtime/orca-runtime-refresh-pty-worktree-records-with-controller-inventory.ts
@@ -3,11 +3,7 @@ import { OrcaRuntimeWithRefreshPtyWorktreeRecordsFromController } from './orca-r
 import type { ResolvedWorktree } from './runtime-worktree-path-identity'
 import type { PtyControllerInventory } from './runtime-pty-controller-contract'
 import { FLOATING_TERMINAL_WORKTREE_ID } from '../../shared/constants'
-import {
-  LOCAL_EXECUTION_HOST_ID,
-  parseExecutionHostId,
-  toSshExecutionHostId
-} from '../../shared/execution-host'
+import { LOCAL_EXECUTION_HOST_ID, toSshExecutionHostId } from '../../shared/execution-host'
 import {
   PTY_CONTROLLER_LIST_PROVIDER_MARGIN_MS,
   PTY_CONTROLLER_LIST_TIMEOUT_MS
@@ -21,14 +17,15 @@ import {
   inferWorktreeIdFromPtyId,
   runtimeWorktreeIdsEqual
 } from './runtime-worktree-path-identity'
-import {
-  indexPersistedPtySurfaceBindings,
-  indexPersistedPtyWorktreeBindings
-} from './runtime-worktree-binding-index'
 import { parseAppSshPtyId } from '../../shared/ssh-pty-id'
 import { NO_OBSERVING_PROVIDER_REASON } from '../../shared/pty-liveness-verdict'
 import { buildControllerTerminalIdentities } from './orca-runtime-build-controller-terminal-identities'
 import { retireOrchestrationAuthorityAbsentFromInventory } from './runtime-restored-orchestration-authority-sweep'
+import { reconcileRuntimeAgentSessionInventory } from './runtime-agent-session-inventory-reconciliation'
+import {
+  getPersistedPtyIndexes,
+  type RuntimePersistedPtyIndexes
+} from './runtime-persisted-pty-indexes'
 
 export class OrcaRuntimeWithRefreshPtyWorktreeRecordsWithControllerInventory extends OrcaRuntimeWithRefreshPtyWorktreeRecordsFromController {
   protected async refreshPtyWorktreeRecordsWithControllerInventory(
@@ -117,36 +114,16 @@ export class OrcaRuntimeWithRefreshPtyWorktreeRecordsWithControllerInventory ext
     }
     const sessions = sessionsResult.value.processes
     const queriedHostIds = new Set<ExecutionHostId>(sessionsResult.value.hostIds)
-    if (connectionId === undefined) {
-      for (const session of sessions) {
-        const hostId = getPtyExecutionHost(session.id)
-        if (hostId && hostId !== 'foreign' && parseExecutionHostId(hostId)?.kind === 'ssh') {
-          queriedHostIds.add(hostId)
-        }
-      }
-    }
+    reconcileRuntimeAgentSessionInventory({
+      sessions,
+      connectionId,
+      queriedHostIds,
+      knownHostIds: this.listKnownExecutionHostIds(),
+      onReconciled: this.onAgentSessionInventoryReconciled ?? undefined
+    })
     const { controllerIdentityByPtyId } = buildControllerTerminalIdentities(sessions)
     const findResolvedWorktree = createIncrementalResolvedWorktreeLookup(resolvedWorktrees)
-    const persistedIndexesByHostId = new Map<
-      ExecutionHostId,
-      {
-        worktreeIdByPtyId: ReadonlyMap<string, string>
-        surfaceByPtyId: ReturnType<typeof indexPersistedPtySurfaceBindings>
-      }
-    >()
-    const getPersistedIndexes = (hostId: ExecutionHostId) => {
-      const existing = persistedIndexesByHostId.get(hostId)
-      if (existing) {
-        return existing
-      }
-      const persistedSession = this.store?.getWorkspaceSession?.(hostId)
-      const indexes = {
-        worktreeIdByPtyId: indexPersistedPtyWorktreeBindings(persistedSession),
-        surfaceByPtyId: indexPersistedPtySurfaceBindings(persistedSession)
-      }
-      persistedIndexesByHostId.set(hostId, indexes)
-      return indexes
-    }
+    const persistedIndexesByHostId = new Map<ExecutionHostId, RuntimePersistedPtyIndexes>()
     const allLivePtyIds = new Set(sessions.map((session) => session.id))
     const selectedLivePtyIds = new Set<string>()
     for (const session of sessions) {
@@ -156,9 +133,14 @@ export class OrcaRuntimeWithRefreshPtyWorktreeRecordsWithControllerInventory ext
       const sessionConnectionId =
         parseAppSshPtyId(session.id)?.connectionId ??
         (typeof connectionId === 'string' ? connectionId : null)
-      const persistedIndexes = getPersistedIndexes(
-        sessionConnectionId ? toSshExecutionHostId(sessionConnectionId) : LOCAL_EXECUTION_HOST_ID
-      )
+      const persistedHostId = sessionConnectionId
+        ? toSshExecutionHostId(sessionConnectionId)
+        : LOCAL_EXECUTION_HOST_ID
+      const persistedIndexes = getPersistedPtyIndexes({
+        cache: persistedIndexesByHostId,
+        store: this.store,
+        hostId: persistedHostId
+      })
       const controllerIdentity = controllerIdentityByPtyId.get(session.id)
       const persistedWorktreeId = persistedIndexes.worktreeIdByPtyId.get(session.id)
       const providerWorktree = session.worktreeId
@@ -303,7 +285,7 @@ export class OrcaRuntimeWithRefreshPtyWorktreeRecordsWithControllerInventory ext
         }
       }
     }
-    // Why: runs after the hasPty rescue so a still-addressable pane keeps its receipt.
+    // Runs after the hasPty rescue so addressable panes keep their receipt.
     retireOrchestrationAuthorityAbsentFromInventory(this.restoredOrchestrationAuthorityByPtyId, {
       queriedHostIds,
       allLivePtyIds,
diff --git a/src/main/runtime/orca-runtime-state-fields.ts b/src/main/runtime/orca-runtime-state-fields.ts
index 876de03fe76..38f04ce0833 100644
--- a/src/main/runtime/orca-runtime-state-fields.ts
+++ b/src/main/runtime/orca-runtime-state-fields.ts
@@ -3,7 +3,11 @@ import { OrcaRuntimeWithLinearCommands } from './orca-runtime-linear-commands'
 import type { RuntimeStore } from './runtime-store-contract'
 import type { StatsCollector } from '../stats/collector'
 import type { IPtyProvider } from '../providers/types'
-import type { RuntimeTerminalAgentStatusEvent } from './runtime-terminal-contracts'
+import type {
+  RuntimeAgentSessionCommit,
+  RuntimeAgentSessionInventoryReconciliation,
+  RuntimeTerminalAgentStatusEvent
+} from './runtime-terminal-contracts'
 import type { TerminalSideEffectBatch } from '../../shared/terminal-side-effect-facts'
 import type { AgentStatusIpcPayload } from '../../shared/agent-status-types'
 import type { StructuredAgentSessionStatusSink } from '../native-chat/agent-session-wire/structured-agent-session-status-feed'
@@ -45,6 +49,10 @@ export class OrcaRuntimeWithStateFields extends OrcaRuntimeWithLinearCommands {
       getSshProvider?: (connectionId: string) => IPtyProvider | undefined
       onPtyStopped?: (ptyId: string) => void
       onTerminalAgentStatus?: (event: RuntimeTerminalAgentStatusEvent) => void
+      onAgentSessionCommitted?: (commit: RuntimeAgentSessionCommit) => void
+      onAgentSessionInventoryReconciled?: (
+        reconciliation: RuntimeAgentSessionInventoryReconciliation
+      ) => void
       onTerminalSideEffects?: (batch: TerminalSideEffectBatch) => void
       // Why: agent status mostly arrives via hooks (agent-hooks/server), not OSC
       // terminal output. worktree.ps reads this at query time so mobile shows the
@@ -226,6 +234,8 @@ export class OrcaRuntimeWithStateFields extends OrcaRuntimeWithLinearCommands {
     this.getSshProviderFn = deps?.getSshProvider ?? null
     this.onPtyStopped = deps?.onPtyStopped ?? null
     this.onTerminalAgentStatus = deps?.onTerminalAgentStatus ?? null
+    this.onAgentSessionCommitted = deps?.onAgentSessionCommitted ?? null
+    this.onAgentSessionInventoryReconciled = deps?.onAgentSessionInventoryReconciled ?? null
     this.buildAgentHookPtyEnv = deps?.buildAgentHookPtyEnv ?? null
     this.getDesktopWindowStatusFn = deps?.getDesktopWindowStatus ?? (() => 'openable')
     this.prepareAiVaultSessionResumeFn = deps?.prepareAiVaultSessionResume ?? null
diff --git a/src/main/runtime/orca-runtime-tests/terminal-creation-and-readiness-part-02.spec.ts b/src/main/runtime/orca-runtime-tests/terminal-creation-and-readiness-part-02.spec.ts
index ddff4bc693b..e919fd32471 100644
--- a/src/main/runtime/orca-runtime-tests/terminal-creation-and-readiness-part-02.spec.ts
+++ b/src/main/runtime/orca-runtime-tests/terminal-creation-and-readiness-part-02.spec.ts
@@ -242,7 +242,36 @@ describe('OrcaRuntimeService', () => {
     expect(internals.ptysById.has('pty-exited-during-start')).toBe(false)
   })
 
+  it('does not publish launch membership from a bare create-operation spawn result', async () => {
+    const onAgentSessionCommitted = vi.fn()
+    const operationId = `${Date.now()}-${'ab'.repeat(16)}`
+    const runtime = new OrcaRuntimeService(store, undefined, { onAgentSessionCommitted })
+    const spawn = vi.fn().mockResolvedValue({
+      id: 'pty-bare-operation-replay',
+      incarnationId: 'incarnation-bare-operation-replay'
+    })
+    runtime.setPtyController({
+      spawn,
+      write: () => true,
+      kill: () => true,
+      getForegroundProcess: async () => null
+    })
+
+    await runtime.createTerminal(`path:${TEST_WORKTREE_PATH}`, {
+      command: 'codex',
+      launchAgent: 'codex',
+      presentation: 'background',
+      agentSessionCreateOperationId: operationId
+    })
+
+    expect(spawn).toHaveBeenCalledWith(
+      expect.objectContaining({ agentSessionCreateOperationId: operationId })
+    )
+    expect(onAgentSessionCommitted).not.toHaveBeenCalled()
+  })
+
   it('adopts repeated structured OMP resumes while preserving the exact file locator', async () => {
+    const onAgentSessionCommitted = vi.fn()
     let canonicalOwner:
       | {
           claim: AgentSessionExecutionClaim
@@ -276,7 +305,7 @@ describe('OrcaRuntimeService', () => {
         }
       }
     })
-    const runtime = new OrcaRuntimeService(store)
+    const runtime = new OrcaRuntimeService(store, undefined, { onAgentSessionCommitted })
     runtime.setPtyController({
       spawn,
       write: () => true,
@@ -296,6 +325,13 @@ describe('OrcaRuntimeService', () => {
 
     expect(first.disposition).toBe('created')
     expect(second.disposition).toBe('adopted')
+    expect(onAgentSessionCommitted).toHaveBeenCalledTimes(2)
+    expect(onAgentSessionCommitted.mock.calls[0]?.[0]).toMatchObject({
+      result: { disposition: 'created', owner: { statusBinding: canonicalOwner?.statusBinding } }
+    })
+    expect(onAgentSessionCommitted.mock.calls[1]?.[0]).toMatchObject({
+      result: { disposition: 'adopted', owner: { statusBinding: canonicalOwner?.statusBinding } }
+    })
     expect(second.terminal).toMatchObject({
       handle: first.terminal.handle,
       tabId: first.terminal.tabId,
diff --git a/src/main/runtime/runtime-agent-session-inventory-reconciliation.test.ts b/src/main/runtime/runtime-agent-session-inventory-reconciliation.test.ts
new file mode 100644
index 00000000000..1a8015e76ff
--- /dev/null
+++ b/src/main/runtime/runtime-agent-session-inventory-reconciliation.test.ts
@@ -0,0 +1,51 @@
+import { afterEach, describe, expect, it, vi } from 'vitest'
+import { agentSessionOwners } from '../ipc/pty/pane/agent-session-owners'
+import { reconcileRuntimeAgentSessionInventory } from './runtime-agent-session-inventory-reconciliation'
+
+const owner = {
+  claim: {
+    digestVersion: 1 as const,
+    keyId: 'key',
+    identityDigest: 'a'.repeat(43),
+    worktreeScopeDigest: 'b'.repeat(43),
+    agent: 'codex' as const
+  },
+  generation: 'generation-1',
+  phase: 'live' as const,
+  ptyId: 'local-pty',
+  surface: {
+    worktreeId: 'wt-1',
+    tabId: 'tab-1',
+    leafId: '11111111-1111-4111-8111-111111111111',
+    terminalHandle: `term_${'a'.repeat(32)}`
+  },
+  statusBinding: {
+    runId: 'run-1',
+    attachment: { executionId: 'execution-1' },
+    role: 'root' as const
+  }
+}
+
+afterEach(() => {
+  agentSessionOwners.release(owner.ptyId)
+})
+
+describe('runtime launch-owner inventory reconciliation', () => {
+  it('includes the current-runtime local owner when the local provider omits owner metadata', () => {
+    agentSessionOwners.register(owner)
+    const onReconciled = vi.fn()
+
+    reconcileRuntimeAgentSessionInventory({
+      sessions: [{ id: owner.ptyId, cwd: '/workspace', title: 'shell' }],
+      connectionId: null,
+      queriedHostIds: new Set(['local']),
+      knownHostIds: new Set(['local']),
+      onReconciled
+    })
+
+    expect(onReconciled).toHaveBeenCalledWith(
+      expect.objectContaining({ complete: true, connectionId: null })
+    )
+    expect(onReconciled.mock.calls[0]?.[0].owners).toEqual([owner])
+  })
+})
diff --git a/src/main/runtime/runtime-agent-session-inventory-reconciliation.ts b/src/main/runtime/runtime-agent-session-inventory-reconciliation.ts
new file mode 100644
index 00000000000..5a23be1abec
--- /dev/null
+++ b/src/main/runtime/runtime-agent-session-inventory-reconciliation.ts
@@ -0,0 +1,45 @@
+import type { PtyProcessInfo } from '../providers/types'
+import type { ExecutionHostId } from '../../shared/execution-host'
+import { getPtyExecutionHost } from '../../shared/terminal-execution-host'
+import { parseExecutionHostId } from '../../shared/execution-host'
+import type { RuntimeAgentSessionInventoryReconciliation } from './runtime-terminal-contracts'
+import { agentSessionOwners } from '../ipc/pty/pane/agent-session-owners'
+
+/** Add host ids discovered in an aggregate inventory and publish its coverage. */
+export function reconcileRuntimeAgentSessionInventory(args: {
+  sessions: readonly PtyProcessInfo[]
+  connectionId?: string | null
+  queriedHostIds: Set<ExecutionHostId>
+  knownHostIds: ReadonlySet<ExecutionHostId>
+  onReconciled?: (reconciliation: RuntimeAgentSessionInventoryReconciliation) => void
+}): void {
+  if (args.connectionId === undefined) {
+    for (const session of args.sessions) {
+      const hostId = getPtyExecutionHost(session.id)
+      if (hostId && hostId !== 'foreign' && parseExecutionHostId(hostId)?.kind === 'ssh') {
+        args.queriedHostIds.add(hostId)
+      }
+    }
+  }
+  if (!args.onReconciled) {
+    return
+  }
+  const owners = [
+    ...args.sessions.flatMap((session) => session.agentSessionOwners ?? []),
+    ...(args.connectionId === undefined || args.connectionId === null
+      ? agentSessionOwners.list().filter((owner) => getPtyExecutionHost(owner.ptyId) === null)
+      : [])
+  ]
+  const complete =
+    args.connectionId !== undefined ||
+    [...args.knownHostIds].every((hostId) => {
+      const kind = parseExecutionHostId(hostId)?.kind
+      return kind === 'runtime' || args.queriedHostIds.has(hostId)
+    })
+  try {
+    args.onReconciled({ owners, complete, connectionId: args.connectionId })
+  } catch (error) {
+    // Inventory-derived bookkeeping must not make a terminal listing fail.
+    console.warn('[runtime] launch membership reconciliation failed:', error)
+  }
+}
diff --git a/src/main/runtime/runtime-hook-agent-row-selection.ts b/src/main/runtime/runtime-hook-agent-row-selection.ts
index 67c1b698a1d..fc640300497 100644
--- a/src/main/runtime/runtime-hook-agent-row-selection.ts
+++ b/src/main/runtime/runtime-hook-agent-row-selection.ts
@@ -6,6 +6,7 @@ import {
   type ParsedAgentStatusPayload
 } from '../../shared/agent-status-types'
 import type { AgentProviderSessionMetadata } from '../../shared/agent-session-resume'
+import type { AgentStatusLaunchMembership } from '../../shared/agent-status-launch-membership'
 import type { RuntimeTerminalAgentStatus } from '../../shared/runtime-types'
 import { mapExplicitAgentStateToRuntimeTerminalStatus } from './runtime-worktree-status-projection'
 
@@ -20,6 +21,7 @@ export type RuntimeAgentRowSnapshot = {
   updatedAt: number
   evidenceObservedAt?: number
   providerSession?: AgentProviderSessionMetadata
+  launchMembership?: AgentStatusLaunchMembership
 }
 
 function isLiveObservation(row: AgentStatusIpcPayload): boolean {
@@ -128,6 +130,7 @@ export function selectFreshAgentRowForMobileTab(args: {
     stateStartedAt: match.stateStartedAt ?? match.receivedAt,
     updatedAt: match.receivedAt,
     ...(match.providerSession ? { providerSession: match.providerSession } : {}),
+    ...(match.launchMembership ? { launchMembership: match.launchMembership } : {}),
     ...(match.evidenceObservedAt !== undefined
       ? { evidenceObservedAt: match.evidenceObservedAt }
       : {})
diff --git a/src/main/runtime/runtime-mobile-agent-status-builder.test.ts b/src/main/runtime/runtime-mobile-agent-status-builder.test.ts
index f9e21d7e323..34a3b97da8e 100644
--- a/src/main/runtime/runtime-mobile-agent-status-builder.test.ts
+++ b/src/main/runtime/runtime-mobile-agent-status-builder.test.ts
@@ -4,6 +4,16 @@ import type { RuntimeAgentRowSnapshot } from './runtime-hook-agent-row-selection
 import { buildRuntimeMobileAgentStatus } from './runtime-mobile-agent-status-builder'
 
 const PROVIDER_SESSION = { key: 'session_id' as const, id: 'session-1' }
+const LAUNCH_MEMBERSHIP = {
+  binding: {
+    runId: 'run-1',
+    attachment: { executionId: 'execution-1' },
+    role: 'root' as const
+  },
+  disposition: 'created' as const,
+  phase: 'committed' as const,
+  committedAt: 10
+}
 const TAB: RuntimeMobileSessionTerminalTab = {
   type: 'terminal',
   id: 'tab::leaf',
@@ -21,7 +31,8 @@ describe('mobile agent status builder', () => {
       payload: { state: 'working', prompt: 'ship it', agentType: 'codex' },
       stateStartedAt: 10,
       updatedAt: 10,
-      providerSession: PROVIDER_SESSION
+      providerSession: PROVIDER_SESSION,
+      launchMembership: LAUNCH_MEMBERSHIP
     }
 
     const result = buildRuntimeMobileAgentStatus(null, TAB, 'term-1', retained, () => [], {
@@ -32,7 +43,10 @@ describe('mobile agent status builder', () => {
 
     expect(result).toEqual(
       expect.objectContaining({
-        agentStatus: expect.objectContaining({ providerSession: PROVIDER_SESSION })
+        agentStatus: expect.objectContaining({
+          providerSession: PROVIDER_SESSION,
+          launchMembership: LAUNCH_MEMBERSHIP
+        })
       })
     )
   })
diff --git a/src/main/runtime/runtime-mobile-agent-status-builder.ts b/src/main/runtime/runtime-mobile-agent-status-builder.ts
index 5ce39d49d6a..533950e6d35 100644
--- a/src/main/runtime/runtime-mobile-agent-status-builder.ts
+++ b/src/main/runtime/runtime-mobile-agent-status-builder.ts
@@ -114,7 +114,8 @@ export function buildRuntimeMobileAgentStatus(
           : {}),
         tabId: tab.parentTabId,
         terminalTitle,
-        ...providerSession
+        ...providerSession,
+        ...(liveRow.launchMembership ? { launchMembership: liveRow.launchMembership } : {})
       },
       ownerAgent,
       ownerOptions
@@ -153,7 +154,8 @@ export function buildRuntimeMobileAgentStatus(
       tabId: tab.parentTabId,
       terminalTitle,
       stateHistory: [],
-      ...providerSession
+      ...providerSession,
+      ...(hookRow.launchMembership ? { launchMembership: hookRow.launchMembership } : {})
     }
   }
 }
diff --git a/src/main/runtime/runtime-mobile-agent-status-projection.ts b/src/main/runtime/runtime-mobile-agent-status-projection.ts
index b21fd8bb3ff..5542280ed80 100644
--- a/src/main/runtime/runtime-mobile-agent-status-projection.ts
+++ b/src/main/runtime/runtime-mobile-agent-status-projection.ts
@@ -6,6 +6,7 @@ import {
   type AgentStatusIpcPayload
 } from '../../shared/agent-status-types'
 import type { AgentProviderSessionMetadata } from '../../shared/agent-session-resume'
+import type { AgentStatusLaunchMembership } from '../../shared/agent-status-launch-membership'
 import { terminalTitleBlocksExplicitAgentStatus } from './runtime-worktree-status-projection'
 import type { HookLiveAgentRow } from './runtime-terminal-contracts'
 import type { RuntimePtyWorktreeRecord } from './runtime-terminal-state-records'
@@ -57,7 +58,8 @@ export function renewRuntimeMobileAgentStatusFromPtyTitle(
     ...(status.worktreeId ? { worktreeId: status.worktreeId } : {}),
     ...(status.tabId ? { tabId: status.tabId } : {}),
     ...(status.terminalTitle ? { terminalTitle: status.terminalTitle } : {}),
-    ...(status.providerSession ? { providerSession: status.providerSession } : {})
+    ...(status.providerSession ? { providerSession: status.providerSession } : {}),
+    ...(status.launchMembership ? { launchMembership: status.launchMembership } : {})
   })
   const titleConfirmsState =
     (pty.lastAgentStatus === 'working' && status.state === 'working') ||
@@ -108,6 +110,7 @@ export type RuntimeHookAgentRowLookup = {
   providerSession: AgentProviderSessionMetadata | null
   providerSessionAgentType: string | null
   providerSessionReceivedAt: number | null
+  launchMembership: AgentStatusLaunchMembership | null
   agentType: string | null
   agentIsLive: boolean
   live: HookLiveAgentRow | null
@@ -158,9 +161,12 @@ export function selectRuntimeHookAgentRowForPane(
             ? { evidenceObservedAt: live.evidenceObservedAt }
             : {}),
           stateStartedAt: live.stateStartedAt ?? live.receivedAt,
-          ...(live.worktreeId ? { worktreeId: live.worktreeId } : {})
+          ...(live.worktreeId ? { worktreeId: live.worktreeId } : {}),
+          ...(live.launchMembership ? { launchMembership: live.launchMembership } : {})
         }
-      : null
+      : null,
+    launchMembership:
+      live?.launchMembership ?? agent?.launchMembership ?? session?.launchMembership ?? null
   }
 }
 
diff --git a/src/main/runtime/runtime-persisted-pty-indexes.ts b/src/main/runtime/runtime-persisted-pty-indexes.ts
new file mode 100644
index 00000000000..13da46b5347
--- /dev/null
+++ b/src/main/runtime/runtime-persisted-pty-indexes.ts
@@ -0,0 +1,29 @@
+import type { ExecutionHostId } from '../../shared/execution-host'
+import type { RuntimeStore } from './runtime-store-contract'
+import {
+  indexPersistedPtySurfaceBindings,
+  indexPersistedPtyWorktreeBindings
+} from './runtime-worktree-binding-index'
+
+export type RuntimePersistedPtyIndexes = {
+  worktreeIdByPtyId: ReadonlyMap<string, string>
+  surfaceByPtyId: ReturnType<typeof indexPersistedPtySurfaceBindings>
+}
+
+export function getPersistedPtyIndexes(args: {
+  cache: Map<ExecutionHostId, RuntimePersistedPtyIndexes>
+  store: RuntimeStore | null
+  hostId: ExecutionHostId
+}): RuntimePersistedPtyIndexes {
+  const existing = args.cache.get(args.hostId)
+  if (existing) {
+    return existing
+  }
+  const persistedSession = args.store?.getWorkspaceSession?.(args.hostId)
+  const indexes = {
+    worktreeIdByPtyId: indexPersistedPtyWorktreeBindings(persistedSession),
+    surfaceByPtyId: indexPersistedPtySurfaceBindings(persistedSession)
+  }
+  args.cache.set(args.hostId, indexes)
+  return indexes
+}
diff --git a/src/main/runtime/runtime-terminal-contracts.ts b/src/main/runtime/runtime-terminal-contracts.ts
index 227788af7e1..c3ab1492185 100644
--- a/src/main/runtime/runtime-terminal-contracts.ts
+++ b/src/main/runtime/runtime-terminal-contracts.ts
@@ -1,6 +1,7 @@
 import type { ParsedAgentStatusPayload } from '../../shared/agent-status-types'
 import type {
   AgentLaunchPreferences,
+  AgentSessionClaimedSpawnResult,
   AgentSessionExecutionClaim,
   RuntimeCreateAgentSessionResult
 } from '../../shared/agent-session-host-authority'
@@ -56,6 +57,25 @@ export type TerminalCreateOptions = {
   deferMobileSessionPublish?: boolean
 }
 
+/** Notification emitted after the execution host commits or adopts a claimed owner. */
+export type RuntimeAgentSessionCommit = {
+  result: AgentSessionClaimedSpawnResult
+  paneKey: string
+  tabId: string
+  leafId: string
+  worktreeId: string
+  connectionId: string | null
+  launchToken?: string
+  agentType?: TuiAgent
+}
+
+export type RuntimeAgentSessionInventoryReconciliation = {
+  owners: readonly unknown[]
+  complete: boolean
+  /** `undefined` is an aggregate census; null is the local host; a string is one SSH host. */
+  connectionId?: string | null
+}
+
 /** Identity a fenced spawn can be re-found by in the execution host's own inventory. */
 export type AgentSessionCreateReclaimIdentity = {
   worktreeId: string
@@ -104,7 +124,12 @@ export type RuntimeTerminalAgentStatusEvent = {
 
 export type HookLiveAgentRow = Pick<
   RuntimeAgentRowSnapshot,
-  'payload' | 'updatedAt' | 'evidenceObservedAt' | 'stateStartedAt' | 'worktreeId'
+  | 'payload'
+  | 'updatedAt'
+  | 'evidenceObservedAt'
+  | 'stateStartedAt'
+  | 'worktreeId'
+  | 'launchMembership'
 >
 
 export type RuntimePtyDataAdmission = Readonly<{
diff --git a/src/main/runtime/runtime-worktree-agent-rows.ts b/src/main/runtime/runtime-worktree-agent-rows.ts
index 20c17f9b01a..ee681bc0e58 100644
--- a/src/main/runtime/runtime-worktree-agent-rows.ts
+++ b/src/main/runtime/runtime-worktree-agent-rows.ts
@@ -62,7 +62,8 @@ export function attachRuntimeWorktreeAgentRows(args: {
       interrupted: source.interrupted,
       stateStartedAt: source.stateStartedAt,
       updatedAt: source.updatedAt,
-      ...(source.structuredHost === 'owned' ? { structuredHostOwned: true as const } : {})
+      ...(source.structuredHost === 'owned' ? { structuredHostOwned: true as const } : {}),
+      ...(source.launchMembership ? { launchMembership: source.launchMembership } : {})
     }
     const rows = rowsByWorktree.get(summary.worktreeId)
     if (rows) {
@@ -81,10 +82,16 @@ export function attachRuntimeWorktreeAgentRows(args: {
     let hasForegroundWorkingAgent = false
     const monitoringSources: RuntimeWorktreeAgentSource[] = []
     for (const row of rows) {
-      if (!isFreshNonDoneAgentStatus(row, now)) {
+      const committedLaunch = row.launchMembership?.phase === 'committed'
+      if (!committedLaunch && !isFreshNonDoneAgentStatus(row, now)) {
         continue
       }
       summary.hasHostSidebarActivity = true
+      if (committedLaunch) {
+        // Membership means the host committed an execution; it is neither a
+        // turn nor a pending interaction and must not make the worktree busy.
+        continue
+      }
       if (row.state === 'working') {
         if (row.workingMode === 'monitoring') {
           const source = rowSources.get(row.paneKey)
diff --git a/src/main/runtime/runtime-worktree-agent-source.ts b/src/main/runtime/runtime-worktree-agent-source.ts
index 984f20e0955..06e972896e7 100644
--- a/src/main/runtime/runtime-worktree-agent-source.ts
+++ b/src/main/runtime/runtime-worktree-agent-source.ts
@@ -1,5 +1,6 @@
 import type { StructuredHostStatus } from '../../shared/agent-hook-listener/listener-event'
 import type { ParsedAgentStatusPayload } from '../../shared/agent-status-types'
+import type { AgentStatusLaunchMembership } from '../../shared/agent-status-launch-membership'
 
 export type RuntimeWorktreeAgentSource = {
   paneKey: string
@@ -19,4 +20,6 @@ export type RuntimeWorktreeAgentSource = {
   updatedAt: number
   /** Projected by the structured session host; `owned` rows stay fresh past the staleness window. */
   structuredHost?: StructuredHostStatus
+  /** Presence proof from the execution host, independent of turn state. */
+  launchMembership?: AgentStatusLaunchMembership
 }
diff --git a/src/main/runtime/runtime-worktree-pty-agent-sources.ts b/src/main/runtime/runtime-worktree-pty-agent-sources.ts
index 058d378df11..4ab4b5a9504 100644
--- a/src/main/runtime/runtime-worktree-pty-agent-sources.ts
+++ b/src/main/runtime/runtime-worktree-pty-agent-sources.ts
@@ -51,7 +51,8 @@ export function collectRuntimeWorktreePtyAgentSources(args: {
       stateStartedAt: entry.stateStartedAt,
       // A replay advances delivery order, not the age of the evidence shown by worktree.ps.
       updatedAt: entry.evidenceObservedAt ?? entry.receivedAt,
-      ...(entry.structuredHost ? { structuredHost: entry.structuredHost } : {})
+      ...(entry.structuredHost ? { structuredHost: entry.structuredHost } : {}),
+      ...(entry.launchMembership ? { launchMembership: entry.launchMembership } : {})
     })
   }
   const sources: RuntimeWorktreeAgentSource[] = []
@@ -65,6 +66,7 @@ export function collectRuntimeWorktreePtyAgentSources(args: {
     // holds the session drops the row itself on close, so its presence is the liveness evidence.
     if (
       source.structuredHost === undefined &&
+      source.launchMembership?.phase !== 'committed' &&
       tabId !== undefined &&
       mirroredWorktreeId === undefined &&
       (source.connectionId === null || isWslHookRelayConnectionId(source.connectionId)) &&
diff --git a/src/main/startup/main-process-runtime-service.ts b/src/main/startup/main-process-runtime-service.ts
index a0a65d54e7a..7c153cd80ce 100644
--- a/src/main/startup/main-process-runtime-service.ts
+++ b/src/main/startup/main-process-runtime-service.ts
@@ -79,6 +79,27 @@ export function initializeMainProcessRuntime(): OrcaRuntimeService {
     getSshProvider: (connectionId) => getSshPtyProvider(connectionId),
     onPtyStopped: clearProviderPtyState,
     onTerminalAgentStatus: (event) => agentHookServer.ingestTerminalStatus(event),
+    onAgentSessionCommitted: (commit) => {
+      agentHookServer.admitAgentSessionOwner({
+        owner: commit.result.owner,
+        paneKey: commit.paneKey,
+        tabId: commit.tabId,
+        worktreeId: commit.worktreeId,
+        connectionId: commit.connectionId,
+        terminalHandle: commit.result.owner.surface.terminalHandle,
+        agentType: commit.agentType ?? commit.result.owner.claim.agent,
+        launchToken: commit.launchToken,
+        disposition: commit.result.disposition
+      })
+    },
+    onAgentSessionInventoryReconciled: (reconciliation) => {
+      agentHookServer.reconcileAgentLaunchMembership(reconciliation.owners, {
+        complete: reconciliation.complete,
+        ...(reconciliation.connectionId !== undefined
+          ? { connectionId: reconciliation.connectionId }
+          : {})
+      })
+    },
     // Why: serve can be promoted in place, so wire the listener from startup; runtime enables desktop-only scanners only for a ready renderer.
     onTerminalSideEffects: (batch: TerminalSideEffectBatch) => {
       if (state.mainWindow && !state.mainWindow.isDestroyed()) {
diff --git a/src/renderer/src/hooks/ipc-events/agent-status-event-applicator.ts b/src/renderer/src/hooks/ipc-events/agent-status-event-applicator.ts
index a4872822252..228d68bcc88 100644
--- a/src/renderer/src/hooks/ipc-events/agent-status-event-applicator.ts
+++ b/src/renderer/src/hooks/ipc-events/agent-status-event-applicator.ts
@@ -240,10 +240,11 @@ export function createAgentStatusEventApplicator(args: {
         ...(ownershipConnectionId !== undefined ? { connectionId: ownershipConnectionId } : {})
       },
       metadata:
-        data.providerSession || data.launchToken
+        data.providerSession || data.launchToken || data.launchMembership
           ? {
               ...(data.providerSession ? { providerSession: data.providerSession } : {}),
-              ...(data.launchToken ? { launchToken: data.launchToken } : {})
+              ...(data.launchToken ? { launchToken: data.launchToken } : {}),
+              ...(data.launchMembership ? { launchMembership: data.launchMembership } : {})
             }
           : undefined
     }
diff --git a/src/renderer/src/store/slices/agent-status-contract.ts b/src/renderer/src/store/slices/agent-status-contract.ts
index eaab5bb78ae..ce8d88f7475 100644
--- a/src/renderer/src/store/slices/agent-status-contract.ts
+++ b/src/renderer/src/store/slices/agent-status-contract.ts
@@ -8,6 +8,7 @@ import type {
   ParsedAgentStatusPayload
 } from '../../../../shared/agent-status-types'
 import type { AgentStatusObservation } from '../../../../shared/agent-status-observation'
+import type { AgentStatusLaunchMembership } from '../../../../shared/agent-status-launch-membership'
 import type {
   AgentProviderSessionMetadata,
   ResumableTuiAgent,
@@ -115,6 +116,7 @@ export type AgentStatusMetadata = {
   launchConfig?: SleepingAgentLaunchConfig
   launchToken?: string
   terminalResumeEligible?: false
+  launchMembership?: AgentStatusLaunchMembership
 }
 
 export type AgentStatusUpdate = {
diff --git a/src/renderer/src/store/slices/agent-status-live-entry-builder.ts b/src/renderer/src/store/slices/agent-status-live-entry-builder.ts
index b161e51bc04..ede692f153b 100644
--- a/src/renderer/src/store/slices/agent-status-live-entry-builder.ts
+++ b/src/renderer/src/store/slices/agent-status-live-entry-builder.ts
@@ -6,13 +6,10 @@ import {
   type AgentStateHistoryEntry,
   type AgentStatusEntry
 } from '../../../../shared/agent-status-types'
-import {
-  agentProviderSessionsEqual,
-  getAgentResumeArgv,
-  isResumableTuiAgent,
-  type AgentProviderSessionMetadata,
-  type SleepingAgentLaunchConfig,
-  type SleepingAgentSessionRecord
+import type {
+  AgentProviderSessionMetadata,
+  SleepingAgentLaunchConfig,
+  SleepingAgentSessionRecord
 } from '../../../../shared/agent-session-resume'
 import {
   resolveAgentStatusIdentity,
@@ -25,10 +22,10 @@ import type {
   AgentStatusRouting,
   AgentStatusTiming
 } from './agent-status-contract'
-import { registryEntryMatchesStatus } from './agent-status-launch-config'
-import { findAgentPaneWorktreeId, getTabIdFromPaneKey } from './agent-status-pane-key-tab-binding'
+import { findAgentPaneWorktreeId } from './agent-status-pane-key-tab-binding'
 import { mergeCurrentOrchestrationContext } from './agent-status-orchestration-context'
 import { deriveAgentStatusLiveFacts } from './agent-status-live-facts'
+import { deriveAgentStatusLiveEntryLaunchContext } from './agent-status-live-entry-launch-context'
 
 export type AgentStatusLiveEntryBuild = {
   entry: AgentStatusEntry
@@ -162,61 +159,26 @@ export function buildAgentStatusLiveEntry(
     payloadMergedOrchestration ??
     runtimeMergedOrchestration ??
     (payload.state === 'done' ? existing?.orchestration : undefined)
-  const canReuseExistingProviderSession =
-    existing?.agentType === identity.agentType &&
-    (existing.state !== 'done' || payload.state === 'done')
-  const providerSession =
-    metadata?.providerSession ??
-    (canReuseExistingProviderSession ? existing.providerSession : undefined)
-  const existingProviderSession = canReuseExistingProviderSession
-    ? existing.providerSession
-    : undefined
-  const providerSessionChanged =
-    Boolean(metadata?.providerSession && existingProviderSession) &&
-    !agentProviderSessionsEqual(
-      identity.agentType,
-      metadata?.providerSession,
-      existingProviderSession
-    )
-  const statusTabId = routing?.tabId ?? existing?.tabId ?? getTabIdFromPaneKey(paneKey) ?? undefined
-  const statusTerminalHandle = routing?.terminalHandle ?? existing?.terminalHandle
-  const registryEntry = state.agentLaunchConfigByPaneKey[paneKey]
-  const registryMatched = registryEntryMatchesStatus({
-    entry: registryEntry,
+  const launchContext = deriveAgentStatusLiveEntryLaunchContext({
+    state,
     paneKey,
-    agentType: identity.agentType,
-    tabId: statusTabId,
-    terminalHandle: statusTerminalHandle,
-    launchToken: metadata?.launchToken,
-    providerSession,
-    existingProviderSession,
-    providerSessionChanged
+    payload,
+    existing,
+    identity,
+    routing,
+    metadata
   })
-  const matchedRegistryLaunchConfig = registryMatched ? registryEntry?.launchConfig : undefined
-  const existingSleepingRecord = state.sleepingAgentSessionsByPaneKey[paneKey]
-  const retainsResumableRecoveryIdentity =
-    payload.state === 'done' &&
-    isResumableTuiAgent(identity.agentType) &&
-    providerSession !== undefined &&
-    getAgentResumeArgv(identity.agentType, providerSession) !== null
-  const matchedSleepingLaunchConfig =
-    (payload.state !== 'done' || retainsResumableRecoveryIdentity) &&
-    existingSleepingRecord?.launchConfig &&
-    existingSleepingRecord.agent === identity.agentType &&
-    providerSession &&
-    agentProviderSessionsEqual(
-      identity.agentType,
-      existingSleepingRecord.providerSession,
-      providerSession
-    )
-      ? existingSleepingRecord.launchConfig
-      : undefined
-  const launchConfigSource =
-    (payload.state !== 'done' && !providerSessionChanged && metadata?.launchToken
-      ? metadata?.launchConfig
-      : undefined) ??
-    matchedRegistryLaunchConfig ??
-    matchedSleepingLaunchConfig
+  const {
+    statusTabId,
+    statusTerminalHandle,
+    launchMembership,
+    registryEntry,
+    registryMatched,
+    providerSession,
+    providerSessionChanged,
+    retainsResumableRecoveryIdentity,
+    launchConfigSource
+  } = launchContext
   const entry: AgentStatusEntry = {
     state: payload.state,
     workingMode: payload.workingMode,
@@ -264,6 +226,7 @@ export function buildAgentStatusLiveEntry(
     ...(metadata?.terminalResumeEligible === false
       ? { terminalResumeEligible: false as const }
       : {}),
+    ...(launchMembership ? { launchMembership } : {}),
     ...(promptInteractionKey ? { promptInteractionKey } : {}),
     ...(payload.restoredUnconfirmed ? { restoredUnconfirmed: true } : {}),
     acceptedStatusSeq: (existing?.acceptedStatusSeq ?? 0) + 1,
diff --git a/src/renderer/src/store/slices/agent-status-live-entry-launch-context.ts b/src/renderer/src/store/slices/agent-status-live-entry-launch-context.ts
new file mode 100644
index 00000000000..114a924d6c2
--- /dev/null
+++ b/src/renderer/src/store/slices/agent-status-live-entry-launch-context.ts
@@ -0,0 +1,110 @@
+import type { AppState } from '../types'
+import {
+  agentProviderSessionsEqual,
+  getAgentResumeArgv,
+  isResumableTuiAgent,
+  type AgentProviderSessionMetadata,
+  type SleepingAgentLaunchConfig
+} from '../../../../shared/agent-session-resume'
+import type { AgentStatusEntry, AgentStatusPayload } from './agent-status-contract'
+import type { AgentStatusMetadata, AgentStatusRouting } from './agent-status-contract'
+import type { resolveAgentStatusIdentity } from '../../../../shared/agent-status-identity'
+import { registryEntryMatchesStatus } from './agent-status-launch-config'
+import { getTabIdFromPaneKey } from './agent-status-pane-key-tab-binding'
+
+export type AgentStatusLiveEntryLaunchContext = {
+  statusTabId: string | undefined
+  statusTerminalHandle: string | undefined
+  launchMembership: AgentStatusMetadata['launchMembership']
+  registryEntry: AppState['agentLaunchConfigByPaneKey'][string] | undefined
+  registryMatched: boolean
+  providerSession: AgentProviderSessionMetadata | undefined
+  providerSessionChanged: boolean
+  retainsResumableRecoveryIdentity: boolean
+  launchConfigSource: SleepingAgentLaunchConfig | undefined
+}
+
+export function deriveAgentStatusLiveEntryLaunchContext(args: {
+  state: AppState
+  paneKey: string
+  payload: AgentStatusPayload
+  existing: AgentStatusEntry | undefined
+  identity: ReturnType<typeof resolveAgentStatusIdentity>
+  routing?: AgentStatusRouting
+  metadata?: AgentStatusMetadata
+}): AgentStatusLiveEntryLaunchContext {
+  const { state, paneKey, payload, existing, identity, routing, metadata } = args
+  const statusTabId = routing?.tabId ?? existing?.tabId ?? getTabIdFromPaneKey(paneKey) ?? undefined
+  const statusTerminalHandle = routing?.terminalHandle ?? existing?.terminalHandle
+  const launchMembership =
+    metadata?.launchMembership ??
+    (existing?.launchMembership &&
+    routing?.terminalHandle !== undefined &&
+    routing.terminalHandle === existing.terminalHandle
+      ? existing.launchMembership
+      : undefined)
+  const registryEntry = state.agentLaunchConfigByPaneKey[paneKey]
+  const canReuseExistingProviderSession =
+    existing?.agentType === identity.agentType &&
+    (existing.state !== 'done' || payload.state === 'done')
+  const providerSession =
+    metadata?.providerSession ??
+    (canReuseExistingProviderSession ? existing.providerSession : undefined)
+  const existingProviderSession = canReuseExistingProviderSession
+    ? existing.providerSession
+    : undefined
+  const providerSessionChanged =
+    Boolean(metadata?.providerSession && existingProviderSession) &&
+    !agentProviderSessionsEqual(
+      identity.agentType,
+      metadata?.providerSession,
+      existingProviderSession
+    )
+  const registryMatched = registryEntryMatchesStatus({
+    entry: registryEntry,
+    paneKey,
+    agentType: identity.agentType,
+    tabId: statusTabId,
+    terminalHandle: statusTerminalHandle,
+    launchToken: metadata?.launchToken,
+    providerSession,
+    existingProviderSession,
+    providerSessionChanged
+  })
+  const matchedRegistryLaunchConfig = registryMatched ? registryEntry?.launchConfig : undefined
+  const existingSleepingRecord = state.sleepingAgentSessionsByPaneKey[paneKey]
+  const retainsResumableRecoveryIdentity =
+    payload.state === 'done' &&
+    isResumableTuiAgent(identity.agentType) &&
+    providerSession !== undefined &&
+    getAgentResumeArgv(identity.agentType, providerSession) !== null
+  const matchedSleepingLaunchConfig =
+    (payload.state !== 'done' || retainsResumableRecoveryIdentity) &&
+    existingSleepingRecord?.launchConfig &&
+    existingSleepingRecord.agent === identity.agentType &&
+    providerSession &&
+    agentProviderSessionsEqual(
+      identity.agentType,
+      existingSleepingRecord.providerSession,
+      providerSession
+    )
+      ? existingSleepingRecord.launchConfig
+      : undefined
+  const launchConfigSource =
+    (payload.state !== 'done' && !providerSessionChanged && metadata?.launchToken
+      ? metadata?.launchConfig
+      : undefined) ??
+    matchedRegistryLaunchConfig ??
+    matchedSleepingLaunchConfig
+  return {
+    statusTabId,
+    statusTerminalHandle,
+    launchMembership,
+    registryEntry,
+    registryMatched,
+    providerSession,
+    providerSessionChanged,
+    retainsResumableRecoveryIdentity,
+    launchConfigSource
+  }
+}
diff --git a/src/shared/agent-hook-listener/listener-event.ts b/src/shared/agent-hook-listener/listener-event.ts
index 48797d09d8f..9f395cf29ca 100644
--- a/src/shared/agent-hook-listener/listener-event.ts
+++ b/src/shared/agent-hook-listener/listener-event.ts
@@ -1,6 +1,7 @@
 import type { ParsedAgentStatusPayload } from '../agent-status-types'
 import type { AgentHookSource } from '../agent-hook-relay'
 import type { AgentProviderSessionMetadata } from '../agent-session-resume'
+import type { AgentStatusLaunchMembership } from '../agent-status-launch-membership'
 
 export type AgentHookEventPayload = {
   paneKey: string
@@ -50,6 +51,8 @@ export type AgentHookEventPayload = {
    *  Lets a reader rejoin the row to its terminal after the pane key moved. Never persisted:
    *  a handle belongs to the runtime that issued it. */
   terminalHandle?: string
+  /** Host-internal launch admission facet. Provider transports cannot author this field. */
+  launchMembership?: AgentStatusLaunchMembership
   payload: ParsedAgentStatusPayload
 }
 
diff --git a/src/shared/agent-status-ipc-payload.ts b/src/shared/agent-status-ipc-payload.ts
index 3bff35272c2..38eb8fe2361 100644
--- a/src/shared/agent-status-ipc-payload.ts
+++ b/src/shared/agent-status-ipc-payload.ts
@@ -15,6 +15,7 @@ import type {
   AgentStatusOrchestrationContext,
   ParsedAgentStatusPayload
 } from './agent-status-types'
+import type { AgentStatusLaunchMembership } from './agent-status-launch-membership'
 
 /** A PTY the pane-key migration could not move, reported for operator triage. */
 export type MigrationUnsupportedPtyEntry = {
@@ -39,6 +40,8 @@ export type AgentStatusIpcPayload = ParsedAgentStatusPayload & {
   paneKey: string
   launchToken?: string
   terminalHandle?: string
+  /** Host-owned committed/adopted execution membership, independent of turn state. */
+  launchMembership?: AgentStatusLaunchMembership
   tabId?: string
   worktreeId?: string
   /** Identifies the SSH connection the event arrived on, or null for local.
diff --git a/src/shared/agent-status-launch-membership.ts b/src/shared/agent-status-launch-membership.ts
new file mode 100644
index 00000000000..f7add3acb34
--- /dev/null
+++ b/src/shared/agent-status-launch-membership.ts
@@ -0,0 +1,104 @@
+/**
+ * Host-owned membership for an execution that Orca committed or adopted.
+ *
+ * Membership is deliberately separate from the legacy status state. A row can
+ * therefore be present before a provider has emitted a turn observation without
+ * manufacturing `working`, `waiting`, or completion evidence.
+ */
+
+import type { AgentStatusExecutionBinding } from './agent-status-run'
+
+/** C5's canonical binding; C10 stores and projects it but never mints one. */
+export type AgentStatusLaunchBinding = AgentStatusExecutionBinding
+
+export type AgentStatusLaunchMembership = {
+  binding: AgentStatusLaunchBinding
+  disposition: 'created' | 'adopted'
+  phase: 'committed' | 'unconfirmed'
+  committedAt: number
+}
+
+const MAX_ID_LENGTH = 128
+
+function isBoundedId(value: unknown): value is string {
+  if (
+    typeof value !== 'string' ||
+    value.length === 0 ||
+    value.length > MAX_ID_LENGTH ||
+    value !== value.trim()
+  ) {
+    return false
+  }
+  for (let index = 0; index < value.length; index += 1) {
+    const code = value.charCodeAt(index)
+    if (code <= 0x1f || code === 0x7f) {
+      return false
+    }
+  }
+  return true
+}
+
+function isRecord(value: unknown): value is Record<string, unknown> {
+  return typeof value === 'object' && value !== null && !Array.isArray(value)
+}
+
+export function parseAgentStatusLaunchBinding(value: unknown): AgentStatusLaunchBinding | null {
+  if (!isRecord(value)) {
+    return null
+  }
+  const attachment = value.attachment
+  if (
+    !isRecord(attachment) ||
+    !isBoundedId(value.runId) ||
+    !isBoundedId(attachment.executionId) ||
+    (value.role !== 'root' && value.role !== 'child')
+  ) {
+    return null
+  }
+  if (value.continuityOf !== undefined && !isBoundedId(value.continuityOf)) {
+    return null
+  }
+  return {
+    runId: value.runId,
+    attachment: { executionId: attachment.executionId },
+    role: value.role,
+    ...(value.continuityOf !== undefined ? { continuityOf: value.continuityOf } : {})
+  }
+}
+
+export function parseAgentStatusLaunchMembership(
+  value: unknown
+): AgentStatusLaunchMembership | null {
+  if (!isRecord(value)) {
+    return null
+  }
+  const binding = parseAgentStatusLaunchBinding(value.binding)
+  if (
+    !binding ||
+    (value.disposition !== 'created' && value.disposition !== 'adopted') ||
+    (value.phase !== 'committed' && value.phase !== 'unconfirmed') ||
+    typeof value.committedAt !== 'number' ||
+    !Number.isFinite(value.committedAt) ||
+    value.committedAt <= 0
+  ) {
+    return null
+  }
+  return {
+    binding,
+    disposition: value.disposition,
+    phase: value.phase,
+    committedAt: value.committedAt
+  }
+}
+
+export function launchMembershipsEqual(
+  left: AgentStatusLaunchMembership,
+  right: AgentStatusLaunchMembership
+): boolean {
+  return (
+    left.binding.runId === right.binding.runId &&
+    left.binding.attachment.executionId === right.binding.attachment.executionId &&
+    left.binding.role === right.binding.role &&
+    left.binding.continuityOf === right.binding.continuityOf
+  )
+}
diff --git a/src/shared/agent-status-types.ts b/src/shared/agent-status-types.ts
index 3a062f7069d..3a77cbf3510 100644
--- a/src/shared/agent-status-types.ts
+++ b/src/shared/agent-status-types.ts
@@ -5,6 +5,7 @@
 import type { AgentProviderSessionMetadata } from './agent-session-resume'
 import type { OrchestrationFleetAttention } from './orchestration-fleet-attention'
 import type { AgentStatusRowFacets } from './agent-status-observation'
+import type { AgentStatusLaunchMembership } from './agent-status-launch-membership'
 import type { TuiAgent } from './tui-agent'
 import {
   normalizeInteractivePromptField,
@@ -141,6 +142,8 @@ export type AgentStatusEntry = {
   interrupted?: boolean
   /** True when this `done` is a session boundary, not a completed turn. See AgentStatusPayload. */
   sessionBoundary?: boolean
+  /** Host-owned committed/adopted execution membership; not completion evidence. */
+  launchMembership?: AgentStatusLaunchMembership
   /** Orchestration dispatch context for panes spawned by another agent.
    *  Why: parent/child hierarchy is pane-level state, not worktree lineage — workers often share the coordinator's worktree. */
   orchestration?: AgentStatusOrchestrationContext
diff --git a/src/shared/runtime-worktree-contracts.ts b/src/shared/runtime-worktree-contracts.ts
index c56bc3a17e6..9d862bf2fce 100644
--- a/src/shared/runtime-worktree-contracts.ts
+++ b/src/shared/runtime-worktree-contracts.ts
@@ -1,4 +1,5 @@
 import type { AgentStatusState, AgentType, AgentWorkingMode } from './agent-status-types'
+import type { AgentStatusLaunchMembership } from './agent-status-launch-membership'
 import type { BaseRefSearchResult, Repo } from './repo-types'
 import type { CreateWorktreeResult, RemoveWorktreeResult } from './worktree/create-types'
 import type {
@@ -28,6 +29,8 @@ export type RuntimeWorktreeAgentRow = {
   /** The structured session host still runs this row's provider child, so it is fresh regardless
    *  of age. Optional on the wire: old hosts never send it. */
   structuredHostOwned?: true
+  /** Host-owned committed/adopted execution membership; not completion evidence. */
+  launchMembership?: AgentStatusLaunchMembership
 }
 
 export type RuntimeWorktreePsSummary = {