[teamleaderleo]

Automatic agent messages can keep a steer-capable turn open indefinitely while older prompts wait in its durable queue. Bound automatic steering to the first ten minutes of the original turn; after that, retain new agent messages in the normal queue and let existing work finish.

Leo asked: "Audit the last ~36 hours of Leo's agent fleet and remove the causes of the delays at the source."

agentSteerWindowMs defaults to 600000; zero queues automatic agent messages immediately. Human steering and explicit Send now remain available. Steer-only requests receive an explicit refusal when the window is closed. Budget deferral never takes the interrupt fallback. There is no new timer, forced completion, or task cancellation; the existing queue owns persistence and continuation. The age uses the persisted original turn start and the system clock.

Risk: normal. This bounds admission, not execution time; work already accepted must finish. Clock changes affect the wall-clock age calculation. Non-steering explicit interrupts keep their existing semantics.

Validation

Focused regression: cargo test -p acpmux --lib agent_steer_window -- --nocapture on hosted Linux or the supported fleet Rust lane. The fixture holds an active tool, accepts a fresh steer, ages the turn, mixes an older unsteered prompt with later steers (including interrupt fallback), then releases the tool normally. It checks order, prompt IDs, exactly-once delivery, one final result per turn, human/Send now behavior, and steer-only refusal.

Red/green exact-head receipts: pending.
Independent Claude Opus 5.5 exact-head review: pending.

Observed / Not run

Prepared regression and inspected all steering/queue paths at base 34e31e4. No local Rust build or suite. Remote runtime checks and final exact-head review are pending.

Changelog

Fixed: Automatic agent messages no longer extend the same running turn indefinitely and starve queued prompts.
Agent session: agent session

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Summary by cubic

Automatic agent messages can no longer keep a turn open indefinitely. After 10 minutes from the original turn start, they enter the durable queue behind existing prompts, while current work finishes normally.

• Human steering and explicit Send now remain available; steer-only requests are refused when the window has closed.
• Set agentSteerWindowMs to change the window; 0 queues automatic messages immediately. Deferred messages do not use the interrupt fallback.

^{Written for commit 111d4a9. 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 111d4a9: 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=pr27566 -f ref=lane/audit-coord-resume-20261029 -f platform=macos -f backend_mode=local

red: cmux-next checks (god files, concurrency, crash safety, l10n); no finished base run on 719c550 to compare; do not merge until green; see lane-rules

[blacksmith-sh]

Found 6 test failures on Blacksmith runners:

Failures

Test	View Logs
/tmp/tmp_faz7zyv/summary-fail.json (live):/summary-fail.json (live):	View Logs
/tmp/tmpzsvewtwh/summary-missing.json (live):/summary-missing.json (live):	View Logs
[new_workspaces] debug.new_workspace timed 0 of 50 new workspace rows/ [new_workspaces] debug.new_workspace timed 0 of 50 new workspace rows	View Logs
[new_workspaces] the window draws no frames/[new_workspaces] the window draws no frames	View Logs
[tabs] debug.tab_switch timed 0 of 40 switches/ [tabs] debug.tab_switch timed 0 of 40 switches	View Logs
[tabs] the window draws no frames/[tabs] the window draws no frames	View Logs

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[teamleaderleo]

Owned by an agent session · session

[teamleaderleo]

Closing as superseded; the branch is kept.

#27520 (merged, d530240) already does what this PR does, in the general form. A session with turnCapMs stops taking other agents' steers once its running turn is past the cap. Those messages wait in the durable queue and the next turn takes them together. The person's own steers and the queue's Send now still go in, the hub steers one notice into the turn, and it never cancels the turn. agentSteerWindowMs would be a second setting for the same bound.

The one thing here that #27520 lacks is a default for every session (10 min). That moves into the follow-up that routes every session's agent messages through an inbox: one digest at the next tool step, never a queued turn per message. That follow-up carries this PR's scenario (an older queued prompt must not starve behind later agent steers) as a test.