ci: sparse-checkout the Claude wrapper regression job

[teamleaderleo]

Problem

"Claude wrapper regressions" takes a slot in the contended macOS pool for one Python lane. Of about 1.1 min per run, 30 s went to checking out the whole tree (17,529 files, 323 MB, including web/, docs/, ios/ and cmux-tui/). The tests themselves take 33 s.

Behavior

The job's checkout is now sparse: only Resources/bin, scripts/ci and tests (plus root files, which checkout's default cone mode always includes). That comes to about 500 files and 7 MB.

Validation

I ran run_python_test_lane.py --lane macos-claude-wrapper from a sparse clone with exactly those three directories and from the full tree. Both give the same result on Linux: every check passes except "computer use auth file", which calls the Mac-only /usr/bin/stat -f and fails the same way on Linux with the full tree. All 139 linux-guard tests pass. actionlint shows no new findings.

🤖 Generated with Claude Code

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Summary by cubic

Speeds up the "Claude wrapper regressions" CI job by checking out only the directories the lane reads instead of the full 17,529-file tree.

• Checkout now pulls only Resources/bin, scripts/ci, and tests (plus root files): about 740 files and 7 MB instead of 323 MB, saving roughly 30 s per run.
• The lane passes identically from a sparse clone and the full tree on Linux; the only failing check is Mac-only and fails the same way either way.

^{Written for commit 6a6f997. Summary will update on new commits.}

Summary by CodeRabbit

• Chores
  • Updated an automated validation job to retrieve only the project files it needs rather than the full repository.
  • The job now checks out selected resources, CI scripts, and tests, reducing the amount of repository content it processes.
  • This change affects the development and validation workflow only; it does not change app features, functionality, or the end-user experience.

[github-actions]

All contributors have signed the CLA ✍️ ✅
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[coderabbitai]

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository: manaflow-ai/cmux/.coderabbit.yaml

Review profile: ASSERTIVE

Plan: Advanced

Run ID: 73e31054-6054-42eb-88d2-c4a93cc19ebc

📥 Commits

Reviewing files that changed from the base of the PR and between 6877751 and 6a6f997.

📒 Files selected for processing (1)

• .github/workflows/ci.yml

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📝 Walkthrough

Walkthrough

The claude-wrapper job’s checkout step now uses sparse checkout for Resources/bin, scripts/ci, and tests.

Changes

Checkout scope

Layer / File(s)	Summary
Configure sparse checkout .github/workflows/ci.yml	The claude-wrapper job’s checkout step specifies Resources/bin, scripts/ci, and tests as sparse-checkout paths.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~5 minutes

Change: Other

Merge Risk: ⚪ Minimal · up to 6a6f9

The sparse checkout includes the lane inputs identified in the supplied context. No concrete behavior change requiring a pre-merge fix is established.

🚥 Pre-merge checks | ✅ 25

✅ Passed checks (25 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the main change: adding sparse checkout to the Claude wrapper regression CI job.
Description check	✅ Passed	The description explains the problem, resulting behavior, performance impact, and validation results. It does not use the template headings exactly and omits the checklist and review-trigger sections,…
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Cmux Cloud Persistent Session And Early Input	✅ Passed	PASS. The authoritative diff changes only .github/workflows/ci.yml for the claude-wrapper job. It adds checkout sparse paths (Resources/bin, scripts/ci, and tests) and a comment. It does not…
Cmux Swift Actor Isolation	✅ Passed	PASS. The pull request changes only .github/workflows/ci.yml and adds actions/checkout sparse-checkout paths. It introduces no production Swift changes or actor-isolation behavior.
Cmux Swift Blocking Runtime	✅ Passed	PASS: The PR changes only .github/workflows/ci.yml. The diff adds sparse-checkout paths and comments; it introduces no Swift code or production runtime synchronization.
Cmux Browser Automation Off-Main	✅ Passed	PASS. The pull request changes only .github/workflows/ci.yml to add sparse checkout paths for the Claude wrapper job. The diff contains no browser socket commands, WebKit/AppKit routing, worker-rout…
Cmux Expensive Synchronous Load	✅ Passed	PASS: The authoritative PR diff changes only .github/workflows/ci.yml. It adds sparse-checkout paths to the claude-wrapper CI job and contains no Swift changes or agent-history loading behavior. T…
Cmux Cache Substitution Correctness	✅ Passed	PASS: The pull request changes only .github/workflows/ci.yml and adds sparse-checkout paths to the Claude wrapper job. It introduces no production Swift, TypeScript, or JavaScript change and no pers…
Cmux No Hacky Sleeps	✅ Passed	PASS. The pull request changes only .github/workflows/ci.yml and adds sparse-checkout paths plus comments. The rule explicitly excludes GitHub Actions workflow YAML, and the added lines contain no s…
Cmux Algorithmic Complexity	✅ Passed	The pull request changes only .github/workflows/ci.yml. The diff adds an actions/checkout sparse-checkout configuration and comments for the claude-wrapper CI job. It does not change production …
Cmux Swift Concurrency	✅ Passed	The pull request changes only .github/workflows/ci.yml. It adds sparse-checkout paths to the Claude wrapper CI job and changes no Swift code or async behavior. The Swift concurrency check is therefo…
Cmux Swift @Concurrent	✅ Passed	The pull request changes only .github/workflows/ci.yml. The authoritative diff contains no Swift, Objective-C, or related source changes, so the @concurrent check is not applicable.
Cmux Swift Package Boundaries	✅ Passed	The pull request changes only .github/workflows/ci.yml. It adds sparse-checkout paths to a CI job and introduces no production Swift changes or Swift package-boundary changes. The custom check is th…
Cmux Swiftpm Lockfiles	✅ Passed	PASS. The pull request changes only .github/workflows/ci.yml by adding sparse checkout paths for the Python Claude wrapper lane. The diff contains no Package.swift, Package.resolved, `.gitignore…
Cmux Swift Logging	✅ Passed	PASS. The pull request changes only .github/workflows/ci.yml and adds sparse-checkout configuration. It adds no production Swift code or logging statements, so the Swift logging failure conditions d…
Cmux User-Facing Error Privacy	✅ Passed	PASS. The PR changes only .github/workflows/ci.yml. It adds sparse checkout paths and a developer-facing CI comment for the claude-wrapper job. No app UI, product CLI, API response, or user-facing…
Cmux Full Internationalization	✅ Passed	The PR changes only .github/workflows/ci.yml. It adds checkout configuration and a CI-only comment for the claude-wrapper job. It does not add or change Swift UI text, app catalogs, web UI text, A…
Cmux Swiftui State Layout	✅ Passed	PASS: The pull request changes only .github/workflows/ci.yml. It adds GitHub Actions sparse-checkout paths and contains no SwiftUI, ObservableObject, @Published, GeometryReader, list-row store, or r…
Cmux Architecture Rethink	✅ Passed	PASS. The pull request changes only .github/workflows/ci.yml. It adds checkout sparse paths and a comment to the CI job. It introduces no Swift code or architecture changes, and it does not introduc…
Cmux Swift Auxiliary Window Close Shortcuts	✅ Passed	PASS. The pull request changes only .github/workflows/ci.yml. The diff contains no Swift or window implementation changes, so the auxiliary-window close-shortcut rule does not apply.
Cmux Source Artifacts	✅ Passed	PASS. The only changed path is .github/workflows/ci.yml. The diff adds a hand-written checkout configuration and comments for sparse-checkout; it does not add local output, generated files, caches…
Cmux No Test Or Debug Seam In Production Source	✅ Passed	PASS: The authoritative pull-request diff changes only .github/workflows/ci.yml. It adds sparse-checkout configuration to the claude-wrapper job and changes no Swift file under a production `Sourc…

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Commit to this branch
• Create a new PR

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[teamleaderleo]

Independent subagent review at 6877751 found no blocking defects.

• What the lane reads: run_python_test_lane.py imports only test_execution_registry.py and reads tests/test-execution.toml.
• What the test reads from the repo: only Resources/bin/cmux-claude-wrapper. It copies that file into temp directories. Every computer-use sandbox path, and every dirname "$0" lookup, resolves under the temp copy, never the repo.
• Sparse vs full checkout: a cone-mode sparse clone and a full checkout give the same lane result. The only failure, "computer use auth file", fails on Linux in both, because the wrapper uses BSD stat.
• Guards: none pins this job's with:, and the full linux-guard lane passes.
• Nit: the checkout comes to about 736 tracked files, not the "about 500" in the comment. The wording doesn't affect behaviour.

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