Fix Cloud workspace and terminal names across checkpoint restore

[austinywang]

Cloud checkpoint/restore could capture old names while a local rename was still in flight, and delayed graph or machine-summary updates could replace restored names afterward. Checkpoints and forks now wait for pending name writes on that machine. Only the currently installed daemon graph can publish names to local projections, and machine summaries preserve canonical workspaces plus known pending resource overlays.

The daemon registry already persists workspace names and placement-local tab names; local session snapshots already store custom titles, provenance, and remote identities. Keep those sources of truth and the ordinary restore path. Synchronous local edits enter the shared queue before returning to the event loop. A newer edit supersedes an earlier failed edit for the same identity, while a failure for another name blocks capture. Other machines remain independent. No snapshot schema migration or parallel name cache is introduced.

The publication guard overlaps #12371 for #12361. This PR also covers checkpoint ordering, actual serialized workspace/panel metadata, stale status summaries, and clear-name delivery to the exact remote tab. Existing assertions now distinguish the terminal's raw PTY title from its placement-local name, and the clear-name fixture registers its provider before publishing a Cloud resource.

Integrated main through b178b2a372, retaining its configured Cloud destination placement and terminal attachment recovery changes. GitHub reports the combined branch as conflict-free. No AppDelegate behavior change remains in this PR.

Validation on a17f24260b (reverification of integrated HEAD ad667657c0 is running):

• CloudWorkspaceRestoreNamesTests: 5 tests / 10 scenarios passed, including Unicode names, separate terminal labels, daemon restart, stale full/delta/topology publications, repeated refresh, subsequent remote renames/clears, checkpoint ordering, and pending workspace overlays.
• SurfaceCatalogTests: 39 passed.
• WorkspaceTitleProvenanceTests: 12 passed, including delivery of an empty name to the exact daemon tab.
• ManagedPolicyCloudGateTests: 4 passed.
• CloudWorkspaceDestinationTests: 3 passed.
• Notification integration passed.
• Unfixed restore baseline: all six cases fail with 42 assertions showing old names replacing saved names, including in a subsequent save. The test-only evidence branch includes compilation repairs and no production fix.
• Test-only metadata regression: fails the two intended pending/deleted workspace assertions before the metadata fix.
• Tagged fleet build passed: Open dogfood build. No local xcodebuild tests or XCUITests were run.
• Swift file budgets, project normalization, test wiring, and git diff --check passed. No budget TSVs changed.
• Localization audit: no product strings or message catalogs changed relative to main.

Current-HEAD verification:

• Restore names, catalog, title provenance, Cloud policy, and Cloud destinations are queued/running.
• A new tagged fleet build is running. Swift budgets, project normalization, test wiring (884 files), and whitespace checks passed after integrating main.

Trade-offs and remaining verification:

• Checkpoint creation waits for pending name writes and propagates failures. Summary-only empty-workspace stubs wait for a daemon snapshot; known pending resource overlays remain visible.
• The dev-backend hostname was unreachable, so the native dogfood build uses production Cloud/auth endpoints. Automated verification did not create or checkpoint a Cloud machine.
• Remote GUI smoke was blocked before app startup by the fleet session's OSLaunchdErrorDomain Code=125: Domain does not support specified action; its lease was released. GUI startup and a live provider checkpoint/restore were not verified.
• Both current Vercel previews are queued for team build concurrency. Superseded queued deployments from this PR were canceled; the current commit's deployments remain queued.

Closes #12438.

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Project	Deployment	Actions	Updated
cmux166	Ready	Preview	Sep 13, 2026 7:01am UTC
cmux41	Ready	Preview	Sep 13, 2026 7:01am UTC

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• cmuxTests/CloudWorkspaceRestoreNamesTests.swift

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📝 Walkthrough

Walkthrough

The change coordinates cloud renames, waits for them before snapshot and fork requests, validates state publication, adds VMSnapshotResult, and tests restoration of workspace and terminal names across refresh paths.

Changes

Cloud restore consistency

Layer / File(s)	Summary
Rename coordination and routing Sources/Surfaces/CloudRenameCoordinator.swift, Sources/Surfaces/SurfaceCatalog.swift, Sources/Surfaces/Workspace+CloudPaneRouting.swift	Rename tasks are ordered per machine. Workspace and tab rename APIs return enqueued tasks.
Checkpoint rename dependency and snapshot model Sources/Cloud/VMClient.swift, Sources/Cloud/VMSnapshotResult.swift, cmuxTests/ManagedPolicyCloudGateTests.swift	VMClient waits for pending renames before snapshot and fork requests. VMSnapshotResult is defined as a standalone model.
Cloud state publication validation Sources/Surfaces/CmuxTuiSurfaceProvider+Refresh.swift, Sources/Surfaces/CmuxTuiSurfaceProviders.swift	Publication requires the active catalog provider and matching cloud state. Snapshot and delta event paths apply the same checks.
Restore and project integration tests cmuxTests/CloudWorkspaceRestoreNamesTests.swift, cmux.xcodeproj/project.pbxproj	Tests cover rename checkpoints, failures, refresh paths, daemon restarts, and later remote name changes. The project registers the new source and test files.

Priority: ➖ Normal

Estimated code review effort: 3 (Moderate) | ~30 minutes

Change: Bug fix · Severity of issue fixed: Medium

Sequence Diagram(s)

sequenceDiagram
  participant RenameOperation
  participant CloudRenameCoordinator
  participant VMClient
  participant CloudService
  RenameOperation->>CloudRenameCoordinator: enqueue rename
  VMClient->>CloudRenameCoordinator: waitForPendingRenames
  CloudRenameCoordinator-->>VMClient: complete or report failure
  VMClient->>CloudService: create snapshot or fork

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Merge Risk: ⚪ Minimal · up to 41df5

The incremental test changes do not leave a supported merge-blocking risk.

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Important

Pre-merge checks failed

Please resolve all errors before merging. Addressing warnings is optional.

❌ Failed checks (2 errors, 1 warning)

Check name	Status	Explanation	Resolution
Cmux Algorithmic Complexity	❌ Error	Sources/Surfaces/CloudRenameCoordinator.swift:58 adds a production checkpoint barrier that filters the entire pendingNames dictionary and then sorts the matching workspace/tab/terminal rename reco…	Maintain pending rename tasks in a per-machine generation-ordered queue or indexed structure while retaining the identity dictionary for name lookup. Then waitForPendingRenames(on:) can read the machine-specific ordered tasks without scan…
Cmux Swift Package Boundaries	❌ Error	The PR adds independently testable domain logic directly to the app target. Sources/Surfaces/CloudRenameCoordinator.swift imports only Foundation and implements the per-machine rename queue, generat…	Extract the queue logic into a small SwiftPM target such as CmuxCloudRename. Expose CloudRenameCoordinator as the first public type, with a package-owned key or machine-ID value API that does not depend on SurfaceMachineID; keep `Surf…
Docstring Coverage	⚠️ Warning	Docstring coverage is 37.14% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 35 functions across 9 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (22 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	The pull request meets the coding requirements for #12438. CloudRenameCoordinator orders workspace, tab, and terminal renames, waits for pending writes before snapshot and fork requests, propagates …
Out of Scope Changes check	✅ Passed	The changed production files implement the name persistence path for #12438. Moving VMSnapshotResult and CloudRenameCoordinator preserves existing sources of truth and supports the new checkpoint …
Cmux Swift Actor Isolation	✅ Passed	No changed production declaration matches an explicit failure condition. CloudRenameCoordinator is explicitly @MainActor, so its mutable queues are isolated. VMClient accesses it from the backgr…
Cmux Swift Blocking Runtime	✅ Passed	PASS. The authoritative diff adds no semaphore, blocking wait, sleep, delayed dispatch, timer, polling loop, main-queue sync, or manual lock. The production coordinator uses await Task.value for ren…
Cmux Browser Automation Off-Main	✅ Passed	The check is not applicable to this pull request. The authoritative diff changes no browser-automation rule-scoped files: Sources/TerminalController.swift and `Packages/macOS/CmuxControlSocket/Sourc…
Cmux Expensive Synchronous Load	✅ Passed	The production diff adds cloud rename coordination, provider publication guards, and async checkpoint barriers. It does not add or move RestorableAgentSessionIndex.load(), SharedLiveAgentIndex loa…
Cmux Cache Substitution Correctness	✅ Passed	PASS — The diff does not replace a fresh authoritative persistence, history, undo, or snapshot read with a cached value. Snapshot and fork now wait for the in-flight rename tasks tracked by CloudRenam…
Cmux No Hacky Sleeps	✅ Passed	PASS: The authoritative PR diff changes nine Swift files and one Xcode project file. It introduces no TypeScript, JavaScript, shell, or non-Swift build/runtime script changes. The only non-Swift chang…
Cmux Swift Concurrency	✅ Passed	The diff does not introduce a prohibited legacy async pattern. Added production code contains no new Dispatch queues/groups, Combine state, completion-handler API, or Task.detached usage. The new coor…
Cmux Swift @Concurrent	✅ Passed	PASS. The PR introduces no @concurrent annotations and no new nonisolated async functions. The new async coordinator is explicitly @MainActor and only serializes and awaits rename tasks. The pro…
Cmux Swiftpm Lockfiles	✅ Passed	PASS. The reviewed diff changes no Package.swift, Package.resolved, or .gitignore file. The only Xcode project changes add Swift source and test file references; they do not change `XCRemoteSwif…
Cmux Swift Logging	✅ Passed	PASS: The pull-request diff adds no print, debugPrint, dump, NSLog, ad hoc file/stdout logging, or Logger declarations. The logging-focused diff scan found no added or removed diagnostic sta…
Cmux User-Facing Error Privacy	✅ Passed	PASS: The production diff adds coordination and state guards, but it adds no user-facing error, alert, command-output, or API-error text. The only new user-visible path is the existing `VMClient.snaps…
Cmux Full Internationalization	✅ Passed	No internationalization failure is introduced. The production diff adds or moves Swift logic and a data model, plus developer comments; it adds no user-facing Swift text, localization keys, API copy, …
Cmux Swiftui State Layout	✅ Passed	The pull request does not introduce a SwiftUI view or SwiftUI state/layout pattern covered by the rule. The added code uses cloud coordination, provider logic, catalog methods, and tests. No added Swi…
Cmux Architecture Rethink	✅ Passed	PASS: The diff does not introduce a rule-listed timing repair such as sleeps, delayed dispatch, polling, locks, semaphores, or notification waits. CloudRenameCoordinator was moved from SurfaceCatalog …
Cmux Swift Auxiliary Window Close Shortcuts	✅ Passed	The pull request does not add or materially change any NSWindow, NSPanel, NSWindowController, SwiftUI Window, or WindowGroup. The changed code covers Cloud rename coordination, provider stat…
Cmux Source Artifacts	✅ Passed	The diff adds or updates only Swift source files, Swift tests, and the Xcode project configuration. The three new files are hand-written product/test code. The project changes register those source an…
Cmux No Test Or Debug Seam In Production Source	✅ Passed	No new test/debug seam was added under Sources. The only visibility widenings are installSnapshotIfNewer, publish, and publishDelta; tests call these existing production behaviors through `@test…
Cmux No Ambient Global State	✅ Passed	No ambient global-state violation was introduced. The coordinator was moved from SurfaceCatalog.swift and remains a constructable @MainActor type with private instance state. `CloudRenameCoordinat…
Title check	✅ Passed	The title clearly and concisely identifies the main change: fixing Cloud workspace and terminal names during checkpoint restore.
Description check	✅ Passed	The description provides a detailed summary, rationale, testing results, verification status, trade-offs, and remaining risks. It does not include the template's explicit Demo Video, Review Trigger, o…

Full details: Cmux Algorithmic Complexity

Explanation

Sources/Surfaces/CloudRenameCoordinator.swift:58 adds a production checkpoint barrier that filters the entire pendingNames dictionary and then sorts the matching workspace/tab/terminal rename records by generation. This is O(P log P) for P pending user-owned identities, with no documented bound or benchmark. The path is used by VM snapshot and fork creation, so it can handle a large pending batch. The change introduces this slower algorithm; it is not test-only or pre-existing debt.

Resolution

Maintain pending rename tasks in a per-machine generation-ordered queue or indexed structure while retaining the identity dictionary for name lookup. Then waitForPendingRenames(on:) can read the machine-specific ordered tasks without scanning all machines and sorting the batch. Alternatively, add a documented lower threshold or benchmark that proves the O(P log P) barrier is acceptable for the expected scale.

Full details: Cmux Swift Package Boundaries

Explanation

The PR adds independently testable domain logic directly to the app target. Sources/Surfaces/CloudRenameCoordinator.swift imports only Foundation and implements the per-machine rename queue, generation handling, pending-name state, cancellation checks, and failure semantics without AppKit, SwiftUI, Ghostty, or lifecycle APIs. The new tests instantiate it directly and exercise checkpoint ordering and failure behavior. The PR adds no SwiftPM package or target. The provider and SurfaceCatalog changes are app composition, but the new coordinator matches the rule's core-logic and isolated-test signals.

Resolution

Extract the queue logic into a small SwiftPM target such as CmuxCloudRename. Expose CloudRenameCoordinator as the first public type, with a package-owned key or machine-ID value API that does not depend on SurfaceMachineID; keep SurfaceCatalog, provider closures, and VMClient wiring in the app target. Move the coordinator tests into the package test target, then adapt the app callers to the package API.

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Actionable comments posted: 1

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Inline comments:
In `@cmuxTests/CloudWorkspaceRestoreNamesTests.swift`:
- Line 100: Update restoredNamesSurviveRefresh to be asynchronous and await
CmuxTuiSurfaceProvider.stop() outside any defer block. Ensure provider cleanup
is awaited on both successful and error paths, using explicit cleanup or an
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📒 Files selected for processing (10)

• Sources/Cloud/VMClient.swift
• Sources/Cloud/VMSnapshotResult.swift
• Sources/Surfaces/CloudRenameCoordinator.swift
• Sources/Surfaces/CmuxTuiSurfaceProvider+Refresh.swift
• Sources/Surfaces/CmuxTuiSurfaceProviders.swift
• Sources/Surfaces/SurfaceCatalog.swift
• Sources/Surfaces/Workspace+CloudPaneRouting.swift
• cmux.xcodeproj/project.pbxproj
• cmuxTests/CloudWorkspaceRestoreNamesTests.swift
• cmuxTests/ManagedPolicyCloudGateTests.swift

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