[teamleaderleo]

Leo, on the "The app refused the agent connection." card under a failed "Set up a Cloud machine" step: "what happened here on this build?"

What happened

A Cloud first send from a New Tab chat whose folder chip named a folder that was not one of the pane's folders. AgentPaneHandOff.cloud (folderInScope) correctly refused it with transport.path_outside_roots before anything reached Cloud, but:

• the reply's message is the generic transportFailedMessage ("The app refused the agent connection."), which cloudStartEnded showed as is;
• startupChecklist marks "machine" failed whenever no step began, so the card blamed "Set up a Cloud machine";
• nothing was logged under app.cloud (CloudStartChat never ran), so the log showed no Cloud failure at all.

Change

• cloudStartEnded: a transport.* code is worded by its code (cloudRefusalText): transport.path_outside_roots reads "This folder isn't open in this tab; pick it to send it to Cloud." (new cloudStartup.folderNotOpen, 21 locales), any other through transportErrors.errorMessage. It sets refusedHere.
• startupChecklist: a refusedHere start marks no step failed.
• AgentPaneHandOff.cloud logs the pane's own refusals (transport.*, cloud_attachments, unsupported) under app.cloud.

folderInScope is not widened. Why the chip's folder was not a root is the follow-up PR (a New Tab recent project nobody clicked is never granted for Cloud).

Small, contained fix (light path): one subagent review, tests in cloudStartProgress.test.ts and CloudStartView.test.tsx.

Risk: low. Only the failed Cloud start card's words and step marks change, plus one log line.

Agent session: agent session

🤖 Generated with Claude Code

---

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---

Summary by cubic

Makes a Cloud start refused on this Mac show why it was refused, stop blaming the "Set up a Cloud machine" step, and log the refusal under app.cloud.

• A transport.* refusal now shows reason-specific wording instead of the generic "The app refused the agent connection."; a folder outside the tab reads "This folder isn't open in this tab; pick it to send it to Cloud."
• A refusal made by the pane before reaching Cloud marks no checklist step failed.
• The pane's own refusals are logged under app.cloud.

^{Written for commit fd36da4. Summary will update on new commits.}

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[github-actions]

cmux status _{(one comment, edited in place; each line is updated by the job that owns it)}

Review fd36da4: HQ feed card · gallery before/after runs · checks

App of this head (app.zip, kept 1 day)

gh workflow run reload-build.yml -R manaflow-ai/cmux --ref feat-cmux-next -f tag=pr34406 -f ref=claude/cloud-start-refusal-reason -f platform=macos -f backend_mode=local

Gallery before/after for fd36da4: 16 states rendered, 17 images differ, 1290 more touched states not rendered. Images are in the run's artifact, not on this public PR; the independent review of this head reads them on its own, so the PR needs no hand-made screenshots of these states.

gh run download 41746647626 -R manaflow-ai/cmux -n gallery-advisory-34406-fd36da45c27d16de60c618d949d73feee4f0fdf4 (then read gallery-review.json)

States

State	Theme	Status	Diff	Picked by
agent-pane.cloud-start/sent	Apple System Colors	changed	0.0165%	own CloudStartView.tsx
agent-pane.cloud-start/sent	Apple System Colors Light	changed	0.0148%	own CloudStartView.tsx
agent-pane.cloud-start/machine	Apple System Colors	changed	0.0387%	own CloudStartView.tsx
agent-pane.cloud-start/machine	Apple System Colors Light	changed	0.0308%	own CloudStartView.tsx
agent-pane.cloud-start/copying	Apple System Colors	changed	0.0202%	own CloudStartView.tsx
agent-pane.cloud-start/copying	Apple System Colors Light	unchanged	0%	own CloudStartView.tsx
agent-pane.cloud-start/opening	Apple System Colors Light	changed	0.0406%	own CloudStartView.tsx
agent-pane.cloud-start/opening	Apple System Colors	changed	0.0233%	own CloudStartView.tsx
agent-pane.cloud-start/failed	Apple System Colors Light	unchanged	0%	own CloudStartView.tsx
agent-pane.cloud-start/failed	Apple System Colors	unchanged	0%	own CloudStartView.tsx
agent-pane.cloud-start/checklist-machine	Apple System Colors Light	changed	0.015%	own CloudStartView.tsx
agent-pane.cloud-start/checklist-machine	Apple System Colors	changed	0.0129%	own CloudStartView.tsx
agent-pane.cloud-start/checklist-clone	Apple System Colors Light	changed	0.0398%	own CloudStartView.tsx
agent-pane.cloud-start/checklist-clone	Apple System Colors	changed	0.0354%	own CloudStartView.tsx
agent-pane.cloud-start/checklist-setup-cached	Apple System Colors Light	changed	0.0148%	own CloudStartView.tsx
agent-pane.cloud-start/checklist-setup-cached	Apple System Colors	changed	0.0142%	own CloudStartView.tsx
agent-pane.url-chip/globe	Apple System Colors Light	unchanged	0%	names Localizable.xcstrings
agent-pane.url-chip/globe	Apple System Colors	unchanged	0%	names Localizable.xcstrings
agent-pane.url-chip/cached-favicon	Apple System Colors Light	unchanged	0%	names Localizable.xcstrings
agent-pane.url-chip/cached-favicon	Apple System Colors	unchanged	0%	names Localizable.xcstrings
agent-pane.url-chip/token-url	Apple System Colors Light	unchanged	0%	names Localizable.xcstrings
agent-pane.url-chip/token-url	Apple System Colors	unchanged	0%	names Localizable.xcstrings
agent-pane.url-chip/pull-request-polished	Apple System Colors Light	changed	0%	names Localizable.xcstrings
agent-pane.url-chip/pull-request-polished	Apple System Colors	unchanged	0%	names Localizable.xcstrings
agent-pane.url-chip/pull-request-polished-draft	Apple System Colors Light	changed	0%	names Localizable.xcstrings
agent-pane.url-chip/pull-request-polished-draft	Apple System Colors	unchanged	0%	names Localizable.xcstrings
agent-pane.url-chip/pull-request-polished-merged	Apple System Colors	changed	0%	names Localizable.xcstrings
agent-pane.url-chip/pull-request-polished-merged	Apple System Colors Light	unchanged	0%	names Localizable.xcstrings
agent-pane.url-chip/pull-request-polished-long-title	Apple System Colors Light	unchanged	0%	names Localizable.xcstrings
agent-pane.url-chip/pull-request-polished-long-title	Apple System Colors	unchanged	0%	names Localizable.xcstrings
agent-pane.url-chip/pull-request-theme-colors	Apple System Colors Light	changed	0%	names Localizable.xcstrings
agent-pane.url-chip/pull-request-theme-colors	Apple System Colors	unchanged	0%	names Localizable.xcstrings

_{Pick other states with a Gallery: entry.id, entry.id/variant line in the PR body.}

Not verified: macOS jobs did not run: compile and app tests were skipped on fd36da45c2; ci-status is green without them.

CI passes on fd36da45c2 (run 41746647688 attempt 1).
macOS jobs did not run: compile and app tests were skipped: Fast static checks skipped (the macos job needs both to succeed). Re-run CI once they pass, before merging.

Written by scripts/ci/classify_failures.py (ci-failure-attribution.yml); signatures are its SIGNATURES table. A machine verdict is the runner's fault, not this PR's; yours means the failing file is one this PR changes, also red on main that main's latest full suite fails the same way, seen on other PRs that it failed on another pull request's run lately.

Shipped in:

• cmux NEXT nightly 1.0.0-nightly.4175186455101 (a7072f8788)

[teamleaderleo]

Review (subagent claude-opus-5-5 medium): SHIP at fd36da4

Checked the Swift logging (isolation, import os), the TS narrowing on CloudStartAnswer, the import graph, the new xcstrings entry, the tests, and that a real Cloud failure keeps the host's words and its failed step.

Follow-ups (fixed forward in the follow-up PR on the same area):

• Web refusedHere covers only transport.*; Swift also counts cloud_attachments and unsupported. An attachment refusal still marks "Set up a Cloud machine" failed.
• unavailable_now and the sandboxRuns refusal are not logged under app.cloud.
• No Swift unit test for AgentPaneHandOff.refusedHere.

[blacksmith-sh]

Found 36 test failures on Blacksmith runners:

Failures

Test	View Logs
main.DeveloperIdAppTests.test_download_prints_the_active_profile_only/ test_download_prints_the_active_profile_only	View Logs
stubs: /System/Library/Frameworks/Security.framework/Versions/A/Security has no stub/ Security has no stub	View Logs
stubs: CoreFoundation.tbd: install-name /System/Library/Frameworks/ CoreFoundation.framework/Versions/A/CoreFoundation, missing 1: ['_CFRetain']/ CoreFoundation, missing 1: ['_CFRetain']	View Logs
stubs: CoreFoundation.tbd: install-name /System/Library/Frameworks/ CoreFoundation.framework/Versions/A/CoreFoundation, missing 1: ['_log2']/ CoreFoundation, missing 1: ['_log2']	View Logs
test_a_build_host_runs_every_piece_niced_and_capped (main.WebLintPrePushTests.test_ a_build_host_runs_every_piece_niced_and_capped)/ test_a_build_host_runs_every_piece_niced_and_capped (main.WebLintPrePushTests.test_ a_build_host_runs_every_piece_niced_and_capped)	View Logs
test_a_clean_pushed_commit_passes_whatever_the_working_tree_holds (main.WebLintPreP ushTests.test_a_clean_pushed_commit_passes_whatever_the_working_tree_holds)/ test_a_clean_pushed_commit_passes_whatever_the_working_tree_holds (main.WebLintPreP ushTests.test_a_clean_pushed_commit_passes_whatever_the_working_tree_holds)	View Logs
test_a_clean_swift_only_push_runs_only_the_pieces_that_read_it (main.WebLintPrePush Tests.test_a_clean_swift_only_push_runs_only_the_pieces_that_read_it)/ test_a_clean_swift_only_push_runs_only_the_pieces_that_read_it (main.WebLintPrePush Tests.test_a_clean_swift_only_push_runs_only_the_pieces_that_read_it)	View Logs
test_a_clone_with_no_reviewed_remote_lints_no_check_code (main.WebLintPrePushTests. test_a_clone_with_no_reviewed_remote_lints_no_check_code)/ test_a_clone_with_no_reviewed_remote_lints_no_check_code (main.WebLintPrePushTests. test_a_clone_with_no_reviewed_remote_lints_no_check_code)	View Logs
test_a_dry_run_lists_exactly_what_a_run_spawns (main.WebLintPrePushTests.test_a_dry _run_lists_exactly_what_a_run_spawns)/ test_a_dry_run_lists_exactly_what_a_run_spawns (main.WebLintPrePushTests.test_a_dry _run_lists_exactly_what_a_run_spawns)	View Logs
test_a_file_in_a_folder_above_a_package_is_check_code (main.WebLintPrePushTests.tes t_a_file_in_a_folder_above_a_package_is_check_code)/ test_a_file_in_a_folder_above_a_package_is_check_code (main.WebLintPrePushTests.tes t_a_file_in_a_folder_above_a_package_is_check_code)	View Logs

...and 26 more test failures. View all on Blacksmith

^{Need help on this PR? Tag @codesmith-bot with what you need.}