[teamleaderleo]

Bead: cx-1mbnu

In some agent chats, the "Claude Code 2.1.299 is available (you have 2.1.296)" card's Update button did nothing. The card sent tab.open to run the update in a terminal tab. AgentPaneModel refuses tab.open when a pane has no New Tab page and wasn't built with allowsTabConversion. That covers a chat started from a prewarmed New Tab page (the spare pool, which adopts with allowsTabConversion: false and drops newTab once it becomes a chat) and chats outside a tab (Start Agent panel, onboarding, floating chat). The page dropped the refusal. Other chats opened a terminal tab and ran the update there, which is what the BEFORE recording shows; even then, the chat kept running the old CLI until it was restarted.

Update now runs the update in the chat:

• The card says "Updating Claude Code…" with a spinner while acpmux runs the agent CLI's own updater on this Mac (_acpmux/harness/update).
• When it finishes: "Claude Code 2.1.299 is installed. Restart the chat to use it." with Restart Chat.
• Restart Chat restarts only this chat's agent (_acpmux/sessions/restart_harness with sessions: [this chat]). If a turn is running, the restart waits for the turn to end, and the card says so.
• Errors show inline in the card with Try Again. If an updater exits 0 but the CLI still reports the old version, that counts as a failure. A restart that fails says so and keeps Restart Chat.
• The card keeps Restart Chat after the update even if health is read again (on a reconnect, for example) and now reads current. Not Now is disabled while the update runs, so it can't drop the Restart Chat that follows.
• If the agent service still running is older than the app, the card says to quit and reopen cmux instead of showing "method not found". If the update outlives its 35-minute limit, the card says it may still finish.

Limits:

• Update and Restart run only for a chat on this Mac and only from a click (the pane's gesture gate). A chat on another machine gets "unsupported".
• Restart Chat refuses any chat this pane didn't start or show (transport.sessions). Without that check, a page could adopt another chat's id with chat.persistSession and restart that chat's agent.
• acpmux accepts the new methods only from its local socket, so neither the app's page nor a peer can call them directly.
• An update that needs sudo still points to Settings > Agents.

Testing

• Red, then green:
  • acpmux harness_update_runs_named_updaters_now_and_never_one_that_needs_sudo (hosted; red e2a1cf19361c).
  • Web HarnessHealthNotice.test.tsx: red e2a1cf19361c 4 pass / 4 fail (updating, updated then restart, restart held for the turn, failed then Try Again); red 97f6e6138261 7 / 3 (card survives a health re-read, Not Now waits, a failed restart); green at head 10 / 0.
  • acpmux restart_harness_restarts_named_chats_and_reports_one_that_cannot_spawn (hosted; red b380d89e3dfa: a named Home Chief chat was skipped and a failed restart dropped, {"after_turn":0,"restarted":0}; green 0c4c6ea97006). The reply is now {restarted, after_turn, failed, errors: [{session, error}]}, and a Chief chat named in sessions restarts.
  • Swift AgentPaneHarnessCardTests (Restart Chat refuses a chat the pane doesn't show): red d5c51780c082, green 3a25cb81013a.
• bun run check passed before the review fixes; it runs in CI on the head. test/ui-rules.test.ts passes on the merged head, the crash ratchet is OK, and the god-file check is clean.
• Base merged at 2834e655ab03 (includes cmux-next: name the owner of ControlWorkspaceInfoCache's publish hop (clears the concurrency red) #20485).
• Follow-up: cx-1mbnu.1 (a deferred restart can stay pending when the turn lock is held without a turn).
• Pending at open: hosted Rust red/green receipts, Windows check, Swift compile on the merged head.
• Before/after recording (Showcase below): cmux NEXT DEV builds on a capture mini, a chat opened with New Agent Chat, Claude Code 2.1.296 in a user-owned npm install.
  • After (93c16bfa95b6, mac fleet build): Update, then "Updating Claude Code…" with a spinner, then "Claude Code 2.1.299 is installed", then Restart Chat. The card goes and the chat answers on the new version.
  • Before (0ea5185b91c0): Update opened a terminal tab next to the chat that ran npm install -g @anthropic-ai/claude-code@latest and installed 2.1.299. This chat came from New Agent Chat, which can open tabs; the "does nothing" case needs a spare-adopted or out-of-tab chat (see above).

Changelog

• Fixed: The Update button on an agent chat's "new version available" card now updates the agent CLI, then offers to restart the chat on the new version.

Showcase

Full quality: pr20569-before-base.mp4

Full quality: pr20569-after-head.mp4

Open the live gallery

🤖 Generated with Claude Code

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[github-actions]

all web/size checks green

[github-actions]

Not verified: macOS jobs did not run: compile and app tests were skipped on d8850f6ae4; ci-status is green without them.

CI passes on d8850f6ae4 (run 38662530913 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.

[github-actions]

CI fast guards passes on d8850f6ae4 (https://github.com/manaflow-ai/cmux/actions/runs/38662530913). This covers only the fast guards, not CI: CI's result is the ci-status check, and the CI failure attribution comment names any failing test.

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[github-actions]

cmux-next tour of ba0d0ba9d6f58398afa736fa755f5752aee922c1 (run)

The tour job failed before the tour ran (build or setup); the run log has the output.

The tour produced no media.

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[teamleaderleo]

Visual preview of d8850f6: in the maintainers' private review feed.

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[teamleaderleo]

Merge receipt for head d8850f6: fleet Release compile green (BUILD SUCCEEDED); hosted Rust verify green (run 38662530945: lint, tests on Linux and macOS, _named_ tests); build x86_64-pc-windows-gnu green; cmux-next fast tier, cmux-next checks, size cap, crash ratchet and web/react-apps-check green. Remaining reds are waived kinds: 'action export areas' (bot job cancelled at checkout) and the cancelled report-only gallery renders. The pub use route_switch::HarnessRestarts; re-export is back now that #20686 split hub/mod.rs.