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Open dropped Cloud terminals optimistically - #15938
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Dropping a Cloud terminal row into a local workspace should reserve its pane before the machine answers, adopt that pane in place, keep repeated drops idempotent, and roll back on failure, a stale reply or sign-out. A Desktop drop into a workspace that already shows it focuses that view. These fail today: the drop awaits the machine before any pane exists and opens a second view of an already-open surface. Refs #15910 Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
A Cloud tree drop awaited the machine's attach before any pane existed, so the drop stalled for the whole round trip. The explicit open-here action already reserved panes; the drop path did not. The drop now uses the same reservation owner: each Cloud terminal gets a pane at the drop spot immediately, with its projection recorded under the stable terminal and tab ids, and the provider adopts that pane in place. Displays and browsers keep their immediate connecting pane, and a mixed workspace group no longer waits on its first terminal. A failed or stale attach, a closed pane, and sign-out or a team switch remove only the dropped pane and restore the layout and selection captured at drop time; late replies are fenced by reservation identity. A placement already open in the target workspace is focused instead of opened again. Closes #15910 Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Review follow-ups for the optimistic drop: - A resource on this Mac is never "already open": its drop moves the one pane, so the idempotency check skips local resources. - Rolling back one member reselects and focuses a surviving member of the same drop before falling back to the pre-drop tab. - The reservation and the attach both honor an in-flight Cloud delete, like the awaited projection path. - A lead pane that rolls back mid-group hands the drop spot to the next member instead of leaving it an orphaned tab destination. - Replacing a machine's provider rolls back its pending drops, as unregistering it does. Refs #15910 Co-Authored-By: Claude Opus 5.5 <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; 2 remain after this review. 📝 WalkthroughWalkthroughCloud surface drops can reserve terminal panes before attachment completes and reuse matching projections already open in the destination workspace. Failed or stale attachment and provider removal roll back pending reservations and restore selection and focus. ChangesCloud surface drops
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~45 minutes Change: Bug fix · Severity of issue fixed: Medium Sequence Diagram(s)sequenceDiagram
participant WorkspaceSurfaceResourceDrop
participant SurfaceCatalog
participant Workspace
participant SurfaceProvider
WorkspaceSurfaceResourceDrop->>SurfaceCatalog: projectGroup with an optimistic pane host
SurfaceCatalog->>Workspace: reserve a Cloud terminal pane
Workspace->>SurfaceProvider: materialize the terminal for the reserved pane
SurfaceProvider-->>Workspace: return the materialized projection
Workspace-->>SurfaceCatalog: complete the reservation or roll it back
Merge Risk: ⚪ Minimal · up to Cloud drops reserve panes immediately, reuse existing placements, and clean up failed attachments without closing remote terminals. No concrete merge-blocking issue was identified; normal build and test checks remain necessary. Security Architecture ReviewSecurity architecture risk: 🟡 Moderate · up to Pane and provider identities are protected against late replies, but the dropped terminal’s saved remote workspace and tab are not bound to its reservation. This weakens stale-placement rejection before buffered input is attached. The demonstrated scope is placement consistency on an already accessible machine; access to another terminal or account is not established. Retained concerns
Security review detailsSecurity Blast Radius
Security Findings and Attack Paths
Trust Boundaries and Controls
Resilience and Maintainability Implications
Important Pre-merge checks failedPlease resolve all errors before merging. Addressing warnings is optional. ❌ Failed checks (2 errors, 2 warnings)
✅ Passed checks (21 passed)
Full details: Linked Issues checkExplanation Issue [ Resolution Implement the Cloud display drop path with an immediate truthful projection and connecting state. Adopt the display in the reserved pane without duplicates. Roll back failed, canceled, stale, signed-out, and cross-team drops while preserving layout and selection. Add focused display tests for projection, reconciliation, rollback, repeated drops, and already-open drops. Full details: Cmux Algorithmic ComplexityExplanation The PR adds nested full scans on the production Cloud drop batch path. Resolution Add a source-of-truth index for open-placement lookup, keyed by resource, destination workspace, and remote tab where applicable, or build one dictionary/set in one pass before processing the group and update it when reservations are recorded or removed. Replace the per-member Full details: Cmux Architecture RethinkExplanation The change splits Cloud terminal reservation lifecycle ownership. Resolution Make the reservation coordinator the single owner of the pending-to-attached or rolled-back state transition. Move the drop failure policy and pre-drop layout snapshot into an explicit reservation/drop transaction or an explicit reservation mode owned by the workspace coordinator. Route both normal reservations and tree drops through one attach implementation with a policy parameter for retry versus remove-on-failure. Keep reservation identity, provider identity, and catalog projection identity as the admission invariants. Remove ✨ Finishing Touches 💡 1📝 Generate docstrings 💡
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…mistic # Conflicts: # cmux.xcodeproj/project.pbxproj
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Review comments at @cmuxTests/CloudSurfaceDropOptimisticTests.swift:
- Around line 108-111: Replace the fixed Task.yield loop in the late-answer test
with a completion signal that resolves when the attach provider returns; await
that signal before checking expectOriginalLayout and catalog.projections. Keep
the existing assertions and test the late-answer path only after provider
completion.
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Sources/Surfaces/CloudSurfaceDrop.swiftSources/Surfaces/CloudTerminalPaneReservation.swiftSources/Surfaces/CmuxTuiSurfaceProvider+Lifecycle.swiftSources/Surfaces/CmuxTuiSurfaceProviders.swiftSources/Surfaces/SurfaceCatalog+Groups.swiftSources/Surfaces/SurfaceCatalog.swiftSources/Surfaces/SurfaceProvider.swiftSources/WorkspaceSurfaceResourceDrop.swiftcmux.xcodeproj/project.pbxprojcmuxTests/CloudDesktopOpenActionTests.swiftcmuxTests/CloudDesktopOpenFixture.swiftcmuxTests/CloudSurfaceDropOptimisticTests.swiftcmuxTests/CloudWorkspaceRowOpenProvider.swift
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The sign-out test asserted after a fixed number of yields, which does not guarantee the attachment had answered. The fixture provider now signals when its attachment returns, and the test awaits that before asserting. Refs #15910 Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
The Desktop navigation fixture's cold drop still used the removed implicit count. It expects the single view the drop opens. Refs #15910 Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Hosted runs showed two problems: - A rolled-back tab drop restored the pre-drop tab, then lost it one run-loop turn later. Closing a tab schedules a focus handoff to its neighbor, and the restore skipped `focusPanel` whenever Bonsplit already reported the target as focused. The restore now always runs the workspace focus transaction, which supersedes that handoff. - Split-drop tests hung until the suite time limit in the windowless Cloud row fixture. The drop tests now use a real main window, as the existing drop focus tests do. Every provider signal wait is bounded by a deadline, so a missing signal fails at its own line. Refs #15910 Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
CloudLinkFirstValue.result is optional; a missing value is a failure. Refs #15910 Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
An instance method cannot run before every stored property is set. Refs #15910 Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
…mistic # Conflicts: # cmux.xcodeproj/project.pbxproj
…mistic # Conflicts: # cmux.xcodeproj/project.pbxproj
The same change as #16232 (7a51764), carried so this PR can restore main's cmuxTests build in one piece. #15381 made LastSurfaceClosePreferenceTests and WorkspaceCloseTabsContextMenuTests call drainMainQueue(timeout:), but the shared helper takes no arguments. Refs #15488 Co-authored-by: Leo Li <cheerleaderleo@outlook.com> Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
The same change as #16242 (90851e5), carried so this PR can restore main's cmuxTests build in one piece. #15381 called CMUXCLI.vmReadyPollInterval from the app-hosted CLIVMTransferTests, where CMUXCLI names the app's routing type, not the CLI. The policy check moves to cmuxCLITests, which builds the CLI target. Refs #15488 Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
#15420 (d0dd226) resolved a merge in this test by dropping `let controller = workspace.bonsplitController` while the divider assertions below still use `controller`, so main's cmuxTests don't compile: cmuxTests/PaneResizeShortcutTests.swift:66:39: error: cannot find 'controller' in scope The binding comes back just before its first use. Refs #15488 Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
#16158's budget test passes budget.admit(...) straight to #expect. Xcode 26.3's macro expands the argument inside a closure where budget is immutable ("cannot use mutating member on immutable value"), so the macOS 15 lane fails at TEST BUILD. Bind each result first. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
…ope) (#16260) * fix: share OpenCodePaths with the CLI through CMUXAgentLaunch #16229 made CLI/cmux.swift call OpenCodePaths, but the enum lived in Sources/SessionIndexModels.swift, which only the app target compiles, so the CLI target fails with "cannot find 'OpenCodePaths' in scope". Move the unchanged path logic into CMUXAgentLaunch, which the app, the CLI and cmuxTests already import, and make its two entry points public. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> * Pass the temporary-config flag to the Codex provider override parser #16201 made providerOverrides(from:) skip provider entries when the caller uses a temporary CODEX_HOME, but read `usesTemporaryConfig`, a parameter of build(configToml:usesTemporaryConfig:) that is not in scope there, so the CLI no longer compiles. Pass the flag through. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> * test: match temporary Codex config argument scope * Make OpenCodePaths a value type to satisfy package conventions Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> * ci: cmux-tui artifact publishing runs in its own artifacts environment (#16267) * test(ci): cmux-tui artifact publishing must run in the artifacts environment #16171 put the cmux-tui publish job in the release environment, whose policy allows only main and v* tags, so helper-branch pin publishes fail before any step runs. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> * fix(ci): cmux-tui artifact publishing runs in the artifacts environment The artifacts environment holds only the R2 upload credentials and allows main, feat-cmux-next and cmux-tui-pin-* helper branches, so daemon pin publishes work again while signing, Sparkle, Homebrew and Apple secrets stay in release (main and v* tags only). Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> --------- Co-authored-by: Claude Opus 5.5 (1M context) <noreply@anthropic.com> * fix(cloud): make Cloud workspace reconciliation always settle (#16158) * test(cloud): reusing a projection at its current placement changes nothing Reconcile reprojects every missing placement through SurfaceCatalog.project. When the reused pane already carries that placement, attachRemoteView still removes and reinserts it, bumps the projection revision twice, and requests the next reconcile of the same machine. Any disagreement between the plan and project() then becomes a main-actor livelock, which is how nightly b36a9b3 spun at 98% CPU and grew to tens of GB (fixed at the plan level by #16025). Fails on main: projectionVersions advances by 2. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> * fix(cloud): reattaching a projection's current placement is a no-op attachRemoteView rewrote a reused projection even when its remote workspace and tab were already the requested ones: it removed and reinserted it (clearing and resetting the panel directory, rerunning sidebar git probes, bumping the guest routing revision twice) and requested another reconcile of the machine. Since reconcile itself reprojects through project(), any plan that reports a shown pane as missing became an endless main-actor loop. Return early when the coordinates are unchanged, and apply a real change as one projections assignment so observers never see the pane unprojected. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> * fix(cloud): setting a projection's current remote placement is a no-op Same guard as attachRemoteView for setRemotePlacement: skip views whose coordinates already match, and apply real changes as one projections assignment. Unchanged placements no longer bump the projection revision or post a catalog change that wakes the device layout coordinator. The test now states its fixture precondition explicitly. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> * test(cloud): reconciling one graph stops when every pass requests another A consumer that requests another reconcile without changing the accepted graph keeps CloudWorkspaceProjectionCoordinator's loop running forever on the main actor, which is how nightly b36a9b3 hung at 100% CPU and grew to tens of GB. Fails on main: the loop runs until the test stub stops asking (1000 passes). Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> * fix(cloud): bound reconciliation passes over one accepted graph CloudWorkspaceProjectionCoordinator re-ran reconcile while anything kept requesting it, with no progress check. Any consumer that asks for another pass without changing the graph (attachRemoteView before this PR, a plan that reports a shown pane as missing in #16025) held the main actor forever: nightly b36a9b3 pinned a core, grew to tens of GB, and could not even run its updater. Count passes over the same accepted CloudVMState. A converging graph needs two or three; after eight, stop, report a Sentry warning, and wait for the next graph or request, which starts a new count. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> * fix(cloud): bound reconciliation by progress, not by passes over one graph Review of the previous bound: counting every pass over an unchanged graph could stop a reconcile that was still making progress (a staggered restore of several bound workspaces re-requests the same graph), stranding panes until the next graph. CloudWorkspaceReconcileBudget now stops after three consecutive passes that start from the same graph, projection revision and bindings (a pass that changed nothing cannot make the next one different), with a hard ceiling of 64 passes per graph for a loop that rewrites projections every pass, as nightly b36a9b3 did. Non-convergence is reported once per graph. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> * fix(cloud): report projection non-convergence once per daemon generation Review: keying the dedupe on the full CloudVMState retained a whole graph per machine for the process lifetime (cancel never cleared it) and still reported once per revision. Key on the cursor generation, include generation and revision in the event, and clear it when the machine is cancelled. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> * chore(l10n): document the French Actions discovery titles as invariant Same change as #16175: main's localization parity check fails on actions.discovery.menuTitle and dialogTitle (fr is identical to English), which blocks this PR's static preflight and every gate behind it. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> --------- Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com> * fix(tests): name the app's window-chrome sidebar options explicitly #11539 reverted #14991's qualification in SidebarWidthPolicyTests, so SidebarMaterialOption.sidebar is ambiguous between CmuxSettings and the app's typealias to WindowChromeSidebarMaterialOption. Use the WindowChrome names again, as #14991 did. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> --------- Co-authored-by: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Co-authored-by: Leo Li <cheerleaderleo@outlook.com> Co-authored-by: Austin Wang <austinwang115@gmail.com>
#16196 added ClaudeHookSessionStoreRecoveryTests with `@testable import cmux_cli`. cmux_cli is the cmux-cli executable, which cmuxCLITests does not link and cannot host, so the target stopped compiling ("Unable to find module dependency: CmuxControlSocketAtomicsC / CmuxSimulatorSystem"), and adding those packages would only move the failure to link time. The two tests now seed the hook state file, run a real `cmux hooks claude session-start` against a mock socket, and read what the CLI left on disk, like the rest of cmuxCLITests: - a malformed sibling record no longer discards a valid session mapping, and a salvageable file is not quarantined; - each of two unreadable state files is moved to its own quarantine backup with its original bytes, and the store keeps working afterwards. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
#16245 moved the vm poll-interval check into cmuxCLITests with `@testable import cmux_cli`, which cannot compile or link for the same reason as the hook store tests: cmux_cli is the CLI executable. The pure policy now lives in CLI/VMReadyPollInterval.swift, compiled into both the CLI and cmuxCLITests (the CMUXCLI+AutoNaming precedent), and CMUXCLI.vmReadyPollInterval delegates to it. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Every hook save prunes records older than the state retention window, so the 1970 timestamps from the in-process test made the valid record vanish for a reason unrelated to decode recovery. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Merge-main commit by scripts/merge-main.sh. Merged by scripts/merge-main.sh: origin/main at df1d958, the newest commit with green CI fast guards (1 newer skipped). Resolved conflicts: - cmux.xcodeproj/project.pbxproj: union of added entries, then normalize-pbxproj.py Merge-main-previous-head: 856ea4a Merge-main-base: df1d958
#15279's review fix (a6c6a00) limited --mark-read to delivered messages, because the store treats a queued message marked read as handled and never delivers it. The merge of main (with #15863) into that branch kept main's version of runAgentInbox, so the filter was lost while the test expecting it landed. Restore the filter, the lease wording in the wake hook comment, and say in help and docs that queued messages stay queued. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Carries the stale-fixture repair from #16355. Co-authored-by: Lawrence Chen <54008264+lawrencecchen@users.noreply.github.com>
Carries the complete fixture repair from #16355. Co-authored-by: Lawrence Chen <54008264+lawrencecchen@users.noreply.github.com>
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# Conflicts: # Resources/Localizable.xcstrings # cmuxCLITests/CLIVMReadyPollIntervalTests.swift # cmuxCLITests/ClaudeHookSessionStoreRecoveryTests.swift # cmuxTests/CLINotifyProcessIntegrationRegressionTests.swift # cmuxTests/CLIVMTransferTests.swift # cmuxTests/CloudWorkspaceLiveProjectionTests.swift # cmuxTests/LastSurfaceClosePreferenceTests.swift # cmuxTests/WorkspaceCloseTabsContextMenuTests.swift # cmuxTests/WorkspaceGroupTests.swift
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# Conflicts: # Sources/Update/NotificationPopoverRow.swift # Sources/Update/UpdateTitlebarAccessory.swift # cmuxTests/PaneResizeShortcutTests.swift
# Conflicts: # Sources/Update/NotificationPopoverRow.swift
# Conflicts: # cmux.xcodeproj/project.pbxproj # cmuxTests/CloudTreeHeaderActionsTests.swift
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Summary
Dragging a Cloud terminal row into a local workspace stalled until the machine answered:
Workspace.handleSurfaceResourceDropprojected the group without an optimistic host, so the pane was created only after the provider's link and surface-resolution round trips. The explicit "open here" action already reserved panes; the drop did not.Drops now use the same reservation owner (
Workspace.reserveCloudTerminalPane). Each Cloud terminal gets its pane at the drop spot at once, showing the connecting state, with its projection recorded under the stable terminal and tab ids. The provider then adopts that same pane (materialize(…, adopting:)), so reconciliation never adds a tab or pane. Displays and browsers keep their immediate connecting pane, and a whole-workspace drop no longer waits on its first terminal before the rest appear.Trade-offs:
CloudDesktopOpenActionTestsasserted the old behavior and is updated.Closes #15910
CI repairs
Merged
origin/mainat90e1689ffc9dand imported the existing test-target repairs from #16306 with their original authorship. These fix the VM poll-policy test's target, the mutating Swift Testing assertion, and the CLI hook recovery test harness. The merge also keeps a single pane-resize controller binding.At
baaf96e27c, CI run 36811287794 passed macOS compile admission and Swift package tests. App-host shards and CLI tests are still running; this is not yet an all-green result. Localpython3 scripts/verify-local.pypassed all 16 selected checks. No native tests ran locally.Independent correctness review of
f53be4c80bf..baaf96e27cfound no actionable issues. The optional canonical autoreview helper timed out twice with a process-cleanup permission error and did not produce a passing receipt. All eight GitHub review threads were resolved at this push.Testing
Focused regression suite
cmuxTests/CloudSurfaceDropOptimisticTests(new), using a provider whose attachment the test releases. It covers:CloudDesktopOpenActionTestscovers the idempotent Desktop drop.451ba79990772b9c83041ec87d805c2e85ed8b01on15910-red-proofis current main plus only the test changes. Run 36715153727 executed 13 tests in 2 suites and failed with 29 issues, all on the expected symptoms. No pending reservation exists before the machine answers. A failed or stale attach is not rolled back (the stale reply left 3 panes, against 1 expected). Sign-out leaves the pane. A whole-workspace drop reserves 0 terminals. Dropping an already-open Desktop opens a second view.950fc92b03e693b36b143c41644526ccddd98836, run 36734714091.CloudSurfaceDropOptimisticTestspassed all 13 cases in 4.5 s, including every split and tab variant.CloudDesktopOpenActionTests,CloudNativeLayoutProjectionTestsandCloudSurfaceOwnershipTestspassed. TwoCloudWorkspaceRowOpenTestscases (row click, not drop) hit their 120 s limit while awaitingSurfaceCatalog.project(...), and the suite's other cases passed after the host relaunched. That matches the pre-existing wedge in CloudMachineWorkspaceAdoptionTests hangs the full 300s allowance three times per job attempt #16020, which is seen on unrelated PRs. This PR callsprojectGroupwithout an optimistic host on that path, and there the loop is behavior-identical to main.python3 scripts/verify-local.py(wire-app-sources, test-wiring, feature-flags) and--only swift-syntax --swift-changedpass.scripts/swift_file_length_budget.pypasses. No local native build was run.Localization: no user-facing strings added.
Changelog
Fixed: Dragging a Cloud terminal or display into a workspace shows it immediately while it connects, removes it cleanly if the connection fails, and focuses it instead of duplicating it when it's already open there.
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