fix(keepalive): expire the unproductive retry allowance into a cooldown, not a latch - #3440
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…wn, not a latch The #3433 fix granted a bounded number of re-dispatches after a zero-output run and then refused until the head changed. That refusal is the ORIGINAL deadlock moved two runs later: only the agent being refused could push the commit that would clear it. The allowance now expires into a 30-minute cooldown measured from the last completion. Time alone clears it and the hourly keepalive sweep wakes it, so nothing the gate forbids is needed to open it. A `completed_at` that cannot be parsed lets the dispatch through -- a gate that cannot measure itself must fail toward motion rather than hold the loop shut on the strength of its own blindness. The design came from the fleet's own parallel attempt at #3433 (#3435), which reached the cooldown before I did; that PR is superseded by the merged #3436 but was right about this. Its documentation gap is closed here too: docs/keepalive/GoalsAndPlumbing.md now carries the full decision table, the unmeasured-vs-unproductive distinction, and why the expiry is a timer. Deliberate-break gate: making the cooldown never expire fails test_dispatch_resumes_once_the_cooldown_has_elapsed and test_unmeasurable_cooldown_fails_toward_motion; restoring it passes. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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📝 WalkthroughWalkthroughRunner dispatches now retry zero-output completions up to a limit, then enter a 30-minute cooldown. Dispatch resumes after cooldown expiry or when the completion timestamp is invalid. The public constant, documentation, and tests reflect this behavior. ChangesRunner dispatch cooldown
Priority: ⬇️ Low Estimated code review effort: 3 (Moderate) | ~20 minutes Change: Bug fix Merge Risk: 🔵 Low · up to A future change could break repeated cooldown behavior after dispatch resumes without the test suite detecting it. Add the focused regression coverage before merging. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
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Inline comments:
In `@tests/scripts/test_runner_lib.py`:
- Around line 1044-1045: Extend the cooldown re-arming test after the resumed
dispatch: record a zero-output completion, assert the tally remains
UNPRODUCTIVE_COMPLETION_RETRY_LIMIT + 1, then immediately verify should_dispatch
is false with reason "unproductive-cooldown".
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docs/keepalive/GoalsAndPlumbing.mdscripts/runner_lib/__init__.pyscripts/runner_lib/core.pytests/scripts/test_runner_lib.py
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🔵 Needs a closer look
Add regression coverage for dispatching after cooldown and re-arming a fresh capped cooldown.
Pull request overview
Replaces the exhausted keepalive retry latch with a 30-minute cooldown and fail-open timestamp handling.
Changes:
- Adds cooldown-based retry recovery and caps unproductive streaks.
- Exports the cooldown constant.
- Adds regression coverage and documents the behavior.
File summaries
| File | Summary |
|---|---|
tests/scripts/test_runner_lib.py |
Tests cooldown, expiry, and invalid timestamps; re-arm behavior after a subsequent zero-output run still needs coverage. |
scripts/runner_lib/core.py |
Implements cooldown recovery and capped retry tracking. |
scripts/runner_lib/__init__.py |
Exports the cooldown constant. |
docs/keepalive/GoalsAndPlumbing.md |
Documents cooldown semantics, decision paths, and rationale. |
Review details
Suppressed comments (1)
scripts/runner_lib/core.py:1232
- The new cap/re-arm path is not exercised: the current tests cover entering cooldown and aging the timestamp, but never dispatch after cooldown, record another
produced_work=Falsecompletion, and assert that the next check starts a fresh cooldown while the tally remains capped. A regression here would still pass the suite despite the documented guarantee that each later zero-output run buys a new window.
# Past the allowance the streak stops climbing: the cooldown is re-armed from this
# completion's timestamp instead, so each new zero-output run buys one fresh window
# rather than an ever-growing count that means nothing.
record["unproductive_completions"] = min(
previous + 1, UNPRODUCTIVE_COMPLETION_RETRY_LIMIT + 1
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Automated Status SummaryHead SHA: a92f5d8
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Updated automatically; will refresh on subsequent CI/Docker completions. Keepalive checklistScopeNo scope information available Tasks
Acceptance criteria
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Review was right that the expiry test alone cannot tell a working re-arm from two regressions: a tally that keeps climbing (so each window is measured from an ever-staler completion) and an expired window that never closes again (so a permanently broken runner is re-dispatched forever). The new test records a second zero-output completion after the first cooldown expires and asserts both a fresh refusal and the capped tally. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Follow-up to #3436, and a correction to it.
The problem with what I merged
#3436 grants a bounded number of re-dispatches after a zero-output run, then refuses with
drainable: a new head commit; unproductive retries exhausted (3/2).That refusal is the original #3433 deadlock moved two runs later. The only actor that could
produce the head commit is the agent being refused. It passes questions 1 and 3 of the
latched-gate check and fails question 2: the mechanism that clears it cannot run while the
gate is closed.
The fleet's own parallel attempt at #3433, #3435, got this right before I did — it expires the
allowance into a timed cooldown. #3435 is superseded by the merged #3436 and now conflicts with
main, so rather than revive it I have ported the part it was right about.
What changed
Time alone clears it, and the hourly keepalive sweep wakes it.
completed_atlets the dispatch through. A gate that cannotmeasure itself must fail toward motion; holding the loop shut on the strength of its own
blindness is how instance nine of this defect class behaved.
window rather than an ever-growing number that means nothing.
docs/keepalive/GoalsAndPlumbing.mdgains the decision table, the unmeasured-vs-unproductivedistinction, and the reasoning above. fix(keepalive): stop the dispatch debounce latching on a zero-output run #3436 shipped with no documentation; that was a gap,
and fix(keepalive): retry successful runs without productive output #3435 had caught it.
Verification
tests/scripts/test_runner_lib.py+tests/workflows: 1122 passed, 10 skipped.which is the property that distinguishes a cooldown from a latch.
test_dispatch_resumes_once_the_cooldown_has_elapsedandtest_unmeasurable_cooldown_fails_toward_motion; restoring it passes.ruffandblackclean.🤖 Generated with Claude Code
Summary by CodeRabbit
New Features
Documentation