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Crash recovery: pace recovered launches, record the account pin on its own, journal Dock closes - #15375
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…ose journaling Three leftovers from crash recovery (#15363), each pinned by a test that fails on main: - Recovery starts every lost session at once. The tests expect only a few to start now (sessions from a workspace on screen, then the most recently active) and the rest to open their workspace and start on first visit. Adds the start plan seam, which still starts everything. - A routed launcher that appends arguments after the forwarded tail leaves no launcher prefix, so the resumed session lost its account pin. The tests expect the wrapper to record the pin from the launcher's own routing headers and the routed restore to use it. - Closing a Claude pane in the Dock does not journal agent.session.ended. Adds the Dock's journal seam; the close path does not use it yet. Refs #15363 Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Crash recovery started every lost session together, so a heavy user's relaunch spawned dozens of agents at the same moment. Recovery now starts a few right away: sessions from a workspace on screen, then the most recently active. The rest open their workspace now and resume on its first visit, the way startup restore treats background workspaces. Their panels carry the session from the start, so a second recovery still skips them. A session resumed through its recorded launcher still starts now, since its launch claim is taken when the command is typed. Refs #15363 Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
The pin a routed Claude restore reapplies came from the launcher prefix, which is what is left of the launcher's argv after stripping the tail it forwarded to Claude. A routed launcher that appends arguments after that tail breaks the match, so no prefix was recorded and the resumed session went back to the pool. The wrapper now records the pinned account itself. It reads the pin from the routing headers the launcher wrote into its private settings file for this launch, so the pin no longer depends on how the launcher was invoked. The hook keeps it with the launch record, and the routed restore passes it as `--account`. A prefix pin still applies to records that predate this. The value is launch metadata only and is never replayed into a resumed process's environment. Refs #15363 Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Closing a workspace pane records agent.session.ended for the Claude session it carried (#15324), but a Dock pane close did not, so a Claude pane closed in the Dock could come back after a crash. The close journaling moves off Workspace onto a small protocol both panel owners conform to, and the Dock calls it from the teardown every close takes. A panel the Dock hands to another container is detached first and is not journaled. Refs #15363 Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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Included review availability: This review used your included allowance. Your plan provides up to 10 included reviews per hour; 0 remain after this review. 📝 WalkthroughWalkthroughThe change captures routed Claude account pins for session restore. It also schedules some recovered sessions to start on first workspace visit and journals agent sessions closed from Dock panels. ChangesClaude account routing
Agent session recovery
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~45 minutes Change: Bug fix · Severity of issue fixed: Medium Sequence Diagram(s)sequenceDiagram
participant Recovery as AgentSessionRecovery
participant Plan as AgentRecoveryStartPlan
participant Tabs as TabManager
participant Workspace
Recovery->>Plan: rank recovery candidates
Recovery->>Tabs: create workspaces with immediate or deferred startup
Tabs->>Workspace: pass first-visit startup option
Tabs->>Workspace: admit queued restores when workspace is selected
Suggested reviewers: Merge Risk: 🟡 Moderate · up to A closed Claude session can remain eligible for recovery and reappear after an unclean exit when a Dock panel retains stale managed state. Address this conditional recovery risk before merging. Security Architecture ReviewSecurity architecture risk: 🔵 Low · up to The changes add useful controls for account routing and crash recovery, but the new account-pin path relies on the provenance of a settings file that has not been established. The identified exposure is limited to local account selection; no broader access or credential disclosure is demonstrated. Retained concerns
Security review detailsSecurity Blast Radius
Security Findings and Attack Paths
Trust Boundaries and Controls
Resilience and Maintainability Implications
Hardening Proposals
Important Pre-merge checks failedPlease resolve all errors before merging. Addressing warnings is optional. ❌ Failed checks (3 errors, 1 warning)
✅ Passed checks (21 passed)
Full details: Cmux Expensive Synchronous LoadExplanation The PR moves the per-candidate Resolution Move working-directory validation off the main actor. Precompute validated directories in a Full details: Cmux Algorithmic ComplexityExplanation The PR adds an O(n log n) full sort in Resolution Replace the full-candidate sort with a linear-time plan. Scan candidates once, classify visible and recorded-launcher candidates, and maintain the top Full details: Cmux Architecture RethinkExplanation The deferred recovery path adds a second owner for startup-restore admission. The PR adds mutable Resolution Make ✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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Dogfood build of cmux DEV pr-15375-41b53b82.app The link opens this exact commit in the cmux dev menu bar app. The build starts on each push and the page waits until it is ready; a newer push replaces it. It signs in against production, so Cloud or backend changes still need a tagged build with a development backend. Dogfood tours of
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…hrough queued hooks A deferred recovered session still started at once: a panel that carries a restore record is admitted when its workspace commits, and admission starts the terminal headless whether or not the workspace is loaded. Recovery now stages those panels with admission deferred, and the workspace admits them when it is first selected. The app test checks the held terminals and the release on visit. The wrapper's recorded account pin never reached the session-start capture: Claude's lifecycle hooks are queued, and each queued layer keeps only an allowlist of environment keys. Claude's queued hooks now carry the routed launch metadata (the pin and the marker pair), and the app's hook ingress accepts it. The capture still validates each value before recording it. Refs #15363 Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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Actionable comments posted: 3
- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @cmuxTests/AgentHookDeliveryQueueTests.swift:
- Line 657: Update AgentHookDeliveryQueueTests to verify that
AgentHookDeliveryProcess.deliveryEnvironment preserves
CMUX_AGENT_LAUNCH_ROUTED_CLAUDE_ACCOUNT for relay-backed events, and add the key
to relayDeliveryKeys so the delivered process environment includes the account
pin.
Review comments at @Sources/AgentSessionCloseJournal.swift:
- Line 76: Update AgentSessionPanelHost and journalClosedAgentSessions to obtain
the close-time binding through agentSessionBindingForClose(panelId:), with the
protocol extension defaulting to the effective binding. Implement the method in
DockSplitStore to prefer managedAgentResumeBinding(panelId:) and fall back to
surfaceResumeBindingsByPanelId, so the close journal records managed agent
sessions.
Review comments at @Sources/TabManager.swift:
- Line 1452: Update makeWorkspaceForCreation to declare
initialTerminalStartsOnFirstVisit with the appropriate default and forward it to
Workspace; update both test overrides of this factory to accept and forward the
parameter so their signatures match.
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CLI/CMUXCLI+AgentHookAdmission.swiftPackages/macOS/CMUXAgentLaunch/Sources/CMUXAgentLaunch/AgentLaunchEnvironmentPolicy.swiftPackages/macOS/CMUXAgentLaunch/Sources/CMUXAgentLaunch/AgentRestorePlanner.swiftPackages/macOS/CMUXAgentLaunch/Sources/CMUXAgentLaunch/AgentSessionRecoveryPlanner.swiftPackages/macOS/CMUXAgentLaunch/Sources/CMUXAgentLaunch/SubrouterClaudeResumeRouting.swiftPackages/macOS/CMUXAgentLaunch/Tests/CMUXAgentLaunchTests/AgentSessionRecoveryTests.swiftPackages/macOS/CMUXAgentLaunch/Tests/CMUXAgentLaunchTests/SubrouterClaudeRestoreRoutingTests.swiftResources/bin/cmux-claude-wrapperSources/AgentHookDeliveryEvent.swiftSources/AgentSessionCloseJournal.swiftSources/AgentSessionRecovery.swiftSources/DockSplitStore+PanelDestruction.swiftSources/DockSplitStore.swiftSources/TabManager.swiftSources/Workspace+PanelLifecycle.swiftSources/Workspace.swiftcmuxTests/AgentHookDeliveryQueueTests.swiftcmuxTests/AgentSessionRecoveryAppTests.swifttests/test_claude_wrapper_subrouter_resume_marker.py
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Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
When Dock process detection shows a tmux binding, the agent-hook binding waits in managedAgentResumeBindingsByPanelId, and a close read only the effective one. The host now lists every binding that can name the session. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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Cross-model review (Codex gpt-5.6-sol)
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Reviewed the repaired exact head
Policy triage: the mechanical XCTest warning is not actionable here. These are signature repairs inside existing XCTest suites, not new test coverage or a new XCTest suite. — Mochi |
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Merge receipt for |
d2877b2 tests: find the Settings window by identifier; Settings UI tests run again (manaflow-ai#15061) 62ee70e Remove the duplicated Claude stop-failure strings from Localizable.xcstrings (manaflow-ai#15414) f9204c4 Crash recovery: pace recovered launches, record the account pin on its own, journal Dock closes (manaflow-ai#15375) d2a290b Let an explicit cmux ssh open's control options reach an idle carrier (manaflow-ai#15285)
1 participant
Closes #15363. Follow-ups from #14870 and #15324.
Recovered launches are paced
After an unclean exit, crash recovery used to start every lost session at once. A heavy user's relaunch could spawn dozens of agents at the same moment. Now only a few start right away: first sessions from a workspace that's on screen, then the most recently active (
AgentRecoveryStartPlan, default 3). The rest get their workspace right away, but their terminal is staged with restore admission deferred. It is admitted, and the agent resumes, the first time the workspace is selected. Each recovered panel carries its session from the start, so running recovery again still skips sessions that haven't started. A session resumed through its recorded launcher always starts right away, because its launch claim is taken when the command is typed.The account pin no longer depends on argv
Recovery reapplied the account pin from the launcher prefix. That prefix comes from stripping, off the launcher's argv, the tail it forwarded to Claude. If a routed launcher appends arguments after that tail, the match fails, no prefix is recorded, and the resumed session goes back to the pool. The wrapper now records the pin itself. It reads the pin from the routing headers the launcher wrote into its private settings file for that launch. Claude's queued lifecycle hooks carry it (along with the routed-launch marker pair, which they used to drop) to the session-start capture. That capture keeps the pin in the launch record (
CMUX_AGENT_LAUNCH_ROUTED_CLAUDE_ACCOUNT), and the routed restore passes it as--account. Records that predate this still get their pin from the prefix. The pin is only launch metadata: it is never replayed into a resumed process's environment. A value that could be read as an option, or that contains shell or control characters, is ignored.Dock closes are journaled on the shared path
Close journaling moves from
WorkspaceontoAgentSessionPanelHost, which bothWorkspaceandDockSplitStoreconform to. The Dock calls it fromdiscardPanelStateAndClose, the teardown every Dock close goes through. A panel the Dock hands to another container is detached before that runs, so it isn't journaled.Tests
The first commit adds the regression tests, and they fail on main:
AgentRecoveryStartPlanTestsandAgentSessionRecoveryAppTests.recoveryStartsOnlyAFewSessionsAtOnceSubrouterClaudeRestoreRoutingTests.recordedAccountPinSurvivesWithoutLauncherPrefixandrecordedAccountPinIsRestoreMetadataOnly, plus the wrapper cases intests/test_claude_wrapper_subrouter_resume_marker.pyAgentSessionRecoveryAppTests.closedDockClaudePaneJournalsItsEndAfter review,
recoveryStartsOnlyAFewSessionsAtOncenow also checks that the deferred terminals are held and that one is released when its workspace is selected.AgentHookDeliveryQueueTests.queuedClaudeHookCarriesRoutedLaunchMetadatacovers the queued hook ingress.🤖 Generated with Claude Code
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