perf(cloud): create New Machine in process by austinywang · Pull Request #18700 · manaflow-ai/cmux

austinywang · 2026-10-09T00:03:51Z

Summary

New Machine now creates supported Cloud machines through the authenticated VM client in the app process. The create response carries a snapshot-v2, trusted-carrier attach receipt (route, token field, session, daemon build, and readiness), so the app admits the machine directly, reuses the existing private-network and userspace WireGuard lifecycle, and skips the cmux vm new subprocess, full fleet refresh, and redundant attach request. CLI-created machines and unsupported New Machine arguments keep the existing CLI path.

The flow keeps one app-<operation UUID> idempotency key for each logical create, preserves the reserved workspace identity, and continues to use the coordinator's cancellation tombstones, stale-completion fences, cleanup, retry-after-open/attach failure, and account-scope checks. A missing or invalid receipt falls back to the existing provider discovery/attach path. No system VPN or new WireGuard stack was added.

Impact map and measurements

The current branch was compared with merged PRs #16787 and #17339, and with historical #13368 and #13030. The active #18672/#16665 activation behavior remains the owner of hub-absent and hub-warming retries; this change does not gate activation or create on a new hub implementation.

Existing provider warm-up, parallel private-network resolution, snapshot-v2 image/attach behavior, and the userspace WireGuard hub/dialer remain in place. The changed path is the app-side handoff after provider create: the receipt populates the registry and marks the trusted carrier, then the existing link method consumes that route once.

Historical control-plane evidence (PR #13368, Freestyle dev backend, n=10) gives the useful before/after bound:

create to attach-ready	Before	Combined baked-image/contract path
client p50	3.31 s	1.80 s
client p90	5.70 s	2.27 s
client maximum	7.37 s	2.31 s

That benchmark reported p90 rather than p95 and described cold startup as about 13 s versus 6–7 s warm before the combined work. PR #17339 measured provider allocation at 1.7–2.7 s and the optimized network-resolution stage at 276–350 ms; that provider allocation remains the material lower bound here. The current request targets the remaining app-side overhead and avoids another attach request, so warm runs should stay near the provider-bound roughly 2 s baseline while cold runs are bounded by provider allocation and hub readiness.

A new live cold/warm p50/p95 run was not safe to execute in this checkout: the authenticated Cloud account currently reports its 40/40 vCPU/memory pool as occupied, and repository policy forbids reloading the user's running cmux to run a tagged dogfood flow. The exact p95 is therefore explicitly left as a hosted/dogfood follow-up rather than inferred from p90/max data.

Testing

Current head: a84f99ab50d73d6bc2f79d37bc50635dd356b1c4.

Exact-head CI is running; package and app-host results are pending.
Local static verification: six selected checks passed, including app-source/test wiring, project normalization, package groups, feature flags, and localization defaults. Separate Swift syntax verification parsed all 35 changed files successfully. git diff --check passed.
Red regression evidence: 7e8efc180d9 executed 309 Cloud package tests and failed exactly the two new default-session assertions. The repair uses cloud while retaining explicit receipt sessions. Hosted verification of the stale-discovery regression is pending.
Cloud shortcut CI repairs reuse Austin Wang's existing work in fix: cmux ssh browser loads pages and forwards localhost to the ssh host #18956, including fixture isolation, closed-window lifetime, and optimistic selection handling.
Earlier web VM/attach checks and tagged build results covered older commits. They do not establish verification of this head; current CI is the source for updated results.
CI is green. Fleet job 78161443025234210159af29 built and published tag pr-18700-cloud-create-v1 (artifact digest 68e7f09860e3e415bd1ec22f52d8ff43354242ce0c0c791fa6b8c09806ec9228), and the tagged app is launched for dogfood. Live cold/warm p50/p95 measurements remain a separate follow-up.

Changelog

Changed: New Machine uses the in-process authenticated create receipt to reach Cloud terminals without redundant app-side subprocess, catalog refresh, or attach work.

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Note

Medium Risk
Touches VM create/link/session handoff and workspace lifecycle; mistakes could mis-dial daemons or duplicate workspaces, but fallbacks to CLI/attach and broad test coverage mitigate scope.

Overview
New Machine for supported vm new / vm open invocations now runs in-process via InProcessMachineCreateLauncher and VMClient.create, with stable app-<operation UUID> idempotency keys passed through MachineCreateCoordinator. Unsupported arguments still use the CLI launcher.

The control plane POST /api/vm response can include an attach snapshot-v2 receipt (route, session, token, daemon build) plus separate resource fields. The Mac decodes this into VMSummary.createAttach, registers the machine from the receipt, and consumes the full endpoint on first link—avoiding a fleet refresh and redundant attach round trip when possible. Native links and vm-tui-connect forward the receipt’s daemon session (default cloud) instead of hard-coded cmux.

Workspace creation keeps the reserved loading pane: manual input is admitted before graph discovery, retries reuse the same reservation (including after window moves), upstream diagnostics are sanitized in the UI, and focus/reveal logic respects admission vs later navigation.

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Summary by cubic

New Machine for supported Cloud create/open flows now runs in the app process via InProcessMachineCreateLauncher and VMClient.create instead of shelling out to cmux vm new. Unsupported flows keep the existing CLI path.

The create response carries a snapshot-v2 trusted-carrier attach receipt (route, token, session, daemon build, readiness), so the app registers the provider directly and skips the subprocess, full fleet refresh, and redundant attach request.

Creates use a stable app-<operation UUID> idempotency key per logical create, so retries reuse the same reserved workspace pane.
The receipt keeps the token, daemon session, and vCPU/memory reservations; native links and vm-tui-connect forward the backend session instead of locally reconstructed defaults. Without a receipt, links use the Cloud daemon session default.
Manual input is admitted before graph discovery; failed discovery retries on the same pane without creating an implicit workspace or closing a user-focused terminal, and a create completing after cancellation is fenced at admission.
Upstream errors are sanitized from create presentation.

^{Written for commit 3b2503c. Summary will update on new commits.}

Summary by CodeRabbit

New Features
- Supported machine creation and opening can run directly in the app, using the requested workspace and opening a terminal when there’s a unique match.
- Machine creation responses can include connection details, allowing the app to connect using available network addresses and supported configurations.
Bug Fixes
- Creation retries now use a consistent operation identifier to help prevent duplicate machines.
- Failure messages no longer expose diagnostic details, and reserved workspace creation preserves existing user terminals.

Merge-main commit by scripts/merge-main.sh. Merged by scripts/merge-main.sh: origin/main at 85e3c90, the newest commit with green CI fast guards (1 newer skipped). Merge-main-previous-head: 018428a Merge-main-base: 85e3c90

Merge-main commit by scripts/merge-main.sh. Merged by scripts/merge-main.sh: origin/main at 31dd543. Merge-main-previous-head: a199bfa Merge-main-base: 31dd543

Merge-main commit by scripts/merge-main.sh. Merged by scripts/merge-main.sh: origin/main at 6003437. Merge-main-previous-head: 45b4ad1 Merge-main-base: 6003437

Merge-main commit by scripts/merge-main.sh. Merged by scripts/merge-main.sh: origin/main at a255d80. Merge-main-previous-head: a46d8e0 Merge-main-base: a255d80

coderabbitai · 2026-10-09T00:04:03Z

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Passes: CI passes on 3b2503c4e5.

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Inline comments:
Review comments at @cmuxTests/InProcessMachineCreateLauncherTests.swift:
- Line 49: Update the assertion in the idempotencyKey test to compare the key
for operationID with the key for a different UUID, verifying distinct inputs
produce distinct keys and avoiding identical operands.

Review comments at
@Packages/macOS/CmuxCloud/Sources/CmuxCloud/VMClient/VMClient.swift:
- Around line 1664-1671: Remove the synthesized snapshot-v2 fallback from the
createAttach assignment that decodes obj["attach"]; set createAttach only from
Self.decodeCreateAttach(obj["attach"]) so it remains nil when the server omits
attach. Do not reconstruct the route or session locally.

Review comments at @Sources/Cloud/InProcessMachineCreateLauncher.swift:
- Around line 198-201: Remove the duplicate network-address enrichment block in
the create flow near the call to dependencies.record; rely on
CmuxTuiSurfaceProviderRegistry.recordCreatedMachine to fill missing IPv4 and
IPv6 addresses from the attach data.

Review comments at @Sources/Cloud/MachineCreateCoordinator.swift:
- Around line 53-54: Update the CancellableLaunch signature to accept the
operation UUID and pass attempt.operationID directly when invoking the launch
closure. Update NewMachineSheetPresenter.launchCreate to use that parameter
instead of reading MachineCreateCoordinator.shared.launchingOperationID, and
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Sources/Cloud/NewMachineSheetPresenter.swift
Sources/Surfaces/CmuxTuiSurfaceProviderRegistry.swift
cmux.xcodeproj/project.pbxproj
cmuxTests/InProcessMachineCreateLauncherTests.swift
web/app/api/vm/route.ts
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austinywang · 2026-10-09T20:21:39Z

Follow-up review fix pushed in 86feaa18f900:

Reserved Cloud workspace adoption now selects the unique .cloudVMLoading panel by identity instead of using the workspace's current focusedPanelId, so a user terminal added and focused while creation is pending is preserved.
Added reservedCreationDoesNotCloseFocusedUserPane to cover loading-card plus focused-user-pane adoption.

Validation on the final commit:

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git diff --check
swift build --disable-sandbox --package-path Packages/macOS/CmuxCloud --target CmuxCloud
swift test --disable-sandbox --package-path Packages/macOS/CmuxCloud --filter CloudMachineCreateArgumentParserTests (3/3)
Exact-SHA app test: CloudMachineWorkspaceAdoptionTests run, currently in progress.

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Inline comments:
Review comments at @cmuxTests/InProcessMachineCreateLauncherTests.swift:
- Around line 27-28: Complete the InProcessMachineCreateLauncher.Dependencies
fixture by supplying the required refresh closure. For the created == true test
case, make provider return a valid provider after recording or discovery so run
reaches the injected open failure instead of throwing noProvider.

Review comments at @Sources/Cloud/InProcessMachineCreateLauncher.swift:
- Around line 109-111: Move the host-manager identity guard in the open flow to
immediately after the liveWorkspace lookup, before provider.refresh() and
catalog resolution, so invalid destinations are rejected before remote work
begins. If workspace moves during creation are supported, instead build
CloudWorkspaceCreationHost from workspace.owningTabManager at open time.

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Packages/macOS/CmuxCloud/Sources/CmuxCloud/Machines/CloudMachineCreateArgumentParser.swift
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Packages/macOS/CmuxCloud/Sources/CmuxCloud/VMClient/VMClient.swift
Packages/macOS/CmuxCloud/Tests/CmuxCloudTests/CloudMachineCreateArgumentParserTests.swift
Sources/AppDelegate.swift
Sources/Cloud/InProcessMachineCreateLauncher.swift
Sources/Cloud/MachineCreateCoordinator.swift
Sources/Cloud/NewMachineSheetPresenter.swift
Sources/Surfaces/CloudWorkspaceCreationHost.swift
Sources/Surfaces/CmuxTuiSurfaceProviderRegistry.swift
cmuxTests/CloudFeatureFlagTests.swift
cmuxTests/CloudInitialWorkspaceNamingTests.swift
cmuxTests/CloudMachineWorkspaceAdoptionTests.swift
cmuxTests/InProcessMachineCreateLauncherTests.swift
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austinywang · 2026-10-09T20:33:38Z

The PR head is now 63f3d562e5e, which supersedes 86feaa18f900 with the final lifecycle hardening:

Reserved adoption uses the unique loading-card panel identity, preserving a user-focused terminal added while creation is pending.
In-process open now fences the registry scope and rejects ambiguous remote workspace or starter-terminal selection instead of attaching an arbitrary resource.
The loading-card regression remains covered by reservedCreationDoesNotCloseFocusedUserPane.

Validation:

Swift syntax, package build, parser tests (3/3), and git diff --check passed.
Direct fleet build for 63f3d562e5e completed successfully on aws-m4pro-4.
Exact-SHA app suites InProcessMachineCreateLauncherTests and CloudMachineWorkspaceAdoptionTests are running against the current PR head.

austinywang · 2026-10-10T02:37:06Z

Addressed the latest review findings in c4ae416dd39:

Completed the InProcessMachineCreateLauncher.Dependencies fixture and updated coordinator test closures for the explicit operation-ID API, fixing the app-test target compile failure.
Require a live placement workspace and owning manager before scheduling native creation.
Validate the workspace owner before remote refresh, rebuild the host if the workspace moved windows, and revalidate after each refresh.
Retry one failed provider graph refresh with force: true; if the graph remains unknown, fail closed rather than creating a duplicate remote workspace.
The created-machine error test now reaches its injected open failure while still asserting upstream diagnostics never reach presentation.

Exact-SHA validation for the final head is queued: focused app suites.

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Inline comments:
Review comments at @Sources/Cloud/InProcessMachineCreateLauncher.swift:
- Line 86: Update the flow around refreshCurrentGraph so
CloudWorkspaceCreationHost admits and reserves the local pane once the machine
ID is known, before awaiting remote graph refresh. Then refresh and attach to
that reservation while preserving the existing cancellation and scope fences, so
openingHost can present the manual input surface without waiting for graph
refresh.

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austinywang · 2026-10-10T07:50:53Z

CI is green for 3b2503c4e5e32626168d9471845aee1b784e10e6 (run 38086715811, attempt 2).

The rerun executed 1,432 app-host tests in 93 suites; all passed.
All four moved-pane retry cases passed, including explicit and inline retry after a window move.
All New Machine layout cases passed, including long names and Base/Size/Network alignment.
The Cloud package lane executed 309 tests; all passed.
The final repair preserves bound remote identity, exact reservation matching, and current-window rebinding on retry.
All review threads are resolved. The earlier main-layout correction remains: main 14c4e1284c5 passed those layout tests in run 38047400680.

A tagged dev build is now being submitted for dogfood. No merge has been performed.

Dev build:

Fleet job 78161443025234210159af29 built the exact SHA with tag pr-18700-cloud-create-v1 and completed successfully.
Published artifact digest: 68e7f09860e3e415bd1ec22f52d8ff43354242ce0c0c791fa6b8c09806ec9228.
The tagged app is launched and its isolated debug socket responds; the user’s running cmux was not replaced or relaunched.

…timization # Conflicts: # Sources/Cloud/CloudTreeNodeActions+WorkspaceLifecycle.swift # Sources/Surfaces/CloudWorkspaceCreationCoordinator.swift

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Merge-main commit by scripts/merge-main.sh. Merged by scripts/merge-main.sh: origin/main at f7095c9, 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: 7b972a2 Merge-main-base: f7095c9

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Co-authored-by: Austin Wang <38676809+austinywang@users.noreply.github.com>

Keep post-create workspace admission safe when discovery has not populated the graph, and resolve a reserved workspace through its current owner during retries.

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austinywang added 8 commits October 8, 2026 16:21

Merge main (85e3c90) into task-cloud-startup-optimization

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test(cloud): pin create attach contract

a199bfa

Merge main (31dd543) into task-cloud-startup-optimization

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Merge main (31dd543) into task-cloud-startup-optimization

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perf(cloud): create New Machine in process

45b4ad1

Merge main (6003437) into task-cloud-startup-optimization

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Merge main (a255d80) into task-cloud-startup-optimization

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fix(cloud): include token in create attach receipt

a4ee92e

fix(cloud): fence cancelled create receipts

8bfad3a

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test(cloud): cover upstream errors in create recovery

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fix(cloud): address in-process create review findings

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austinywang added 2 commits October 9, 2026 13:12

fix(cloud): fence provider fallback by creation scope

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fix(cloud): preserve focused pane during reserved adoption

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fix(cloud): fence in-process workspace adoption

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fix(cloud): repair launcher review regressions

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austinywang added 2 commits October 10, 2026 01:30

test(cloud): enable hosted accessibility fixtures

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Merge remote-tracking branch 'origin/main' into task-cloud-startup-op…

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test(cloud): use hosted accessibility frames for machine sheet

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test(cloud): order hosted pop-ups by visual row

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test(cloud): keep native machine sheet controls in fixtures

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test(cloud): locate hosted machine menus by role

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test(cloud): match hosted machine menus by labels

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test(cloud): reproduce reconnect and stale discovery regressions

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austinywang added 10 commits October 10, 2026 13:10

fix(cloud): use Cloud session and force post-create discovery

c2a10d5

Co-authored-by: Austin Wang <38676809+austinywang@users.noreply.github.com>

test: stabilize cloud shortcut coverage

40d2ce5

fix: release closed cloud managers and avoid duplicate tmux panes

e88bb60

test: restore shared cloud fixture binding environment

9cdb34e

test: avoid waiting for duplicate cloud creation event

2bca6ba

fix: preserve optimistic cloud workspace focus

898412c

test: keep delayed cloud reveal visible

b97dedb

fix(cloud): admit unknown graphs and moved workspaces

069bca9

Keep post-create workspace admission safe when discovery has not populated the graph, and resolve a reserved workspace through its current owner during retries.

docs(cloud): clarify graph discovery fallback

68c8731

test(cloud): guard unknown graphs and reserved retry identity

7d28bd9

cursor Bot reviewed Oct 10, 2026

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Comment thread Sources/Cloud/InProcessMachineCreateLauncher.swift Outdated

austinywang added 4 commits October 10, 2026 13:34

test(cloud): cover pane retries and retain bound identity

aba3295

fix(cloud): retain bound identity and retry moved panes safely

a84f99a

test(cloud): register the destination window for moved-pane retries

ec4b609

test(cloud): stabilize moved retry and sheet fixture timing

3b2503c

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Summary

Impact map and measurements

Testing

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