test(heartbeat): make the queued-backlog convergence suite deterministic (BLO-20885) by allyblockcast[bot] · Pull Request #1011 · Blockcast/paperclip

allyblockcast · 2026-08-04T09:17:15Z

Thinking Path

Paperclip is the open source app people use to manage AI agents for work

Agent work is dispatched by the heartbeat queue, whose convergence guarantees are asserted by heartbeat-queued-backlog-convergence.test.ts — that suite is the acceptance evidence for BLO-20396's queue-convergence criteria

Two cases in that suite assert on timing rather than on behaviour: one races wall-clock to establish an ordering, the other bounds convergence with a drain budget it routinely consumes 39–76% of

So the suite fails for reasons unrelated to the code under test. It has already produced a wrong conclusion about a colleague's design, and it is currently holding a red General tests (server 4/4) on a review-converged PR (fix(heartbeat): crash-time run marking + convergent recovery (BLO-20822) #952)

Worse, a flaky assertion here teaches reviewers to discount exactly the signal BLO-20396 depends on

This pull request removes both timing dependencies — one by making the ordering explicit, one by widening a hang guard to a value that cannot be reached by a merely-slow runner

The benefit is that a red in this suite becomes information again

Linked Issues or Issue Description

Fixes: BLO-20885 — Flaky dispatch regression: sibling-starvation case relies on head-rescan timing
Refs BLO-20396 — parent ticket whose acceptance evidence this suite provides
Refs BLO-19722 — where the CI red surfaced and was diagnosed

What Changed

0017436d0 — the "honours dispatch demand that arrived before the first pass installed its cursor" case no longer races wall-clock. It needs a claimable row to appear at the head after the first pass installs its cursor but before the resume chain exhausts the scan; it bought that ordering with 2,400 dependency-blocked rows whose slow cancellation was expected to outlast the insert. The ordering is now explicit — the insert happens inside beforeQueuedDispatchPassForTest, awaited inside the agent lock at the start of the first resume_bounded_scan pass. Fixture drops 2,400 → 6 rows.
0017436d0 — adds two assertions that the head row was reached by the coalesced-demand head rescan and not by a prune follow-up. scheduleFollowUpDispatchAfterPrune schedules a head-start pass that would rescue the row for an unrelated reason and mask the starvation bug; an earlier version of this test passed against the bug for exactly that reason.
13d5557a0 — the scan-ceiling case's drainInFlightExecutions bound goes 120_000 → 420_000, with the rationale written into the test rather than left in a commit message.

Verification

Full file, not a -t filter:

npx vitest run src/__tests__/heartbeat-queued-backlog-convergence.test.ts
  Test Files  1 passed (1)
       Tests  11 passed (11)
    Duration  264.76s

Measured from that run's own log timestamps, the ceiling case cancels its 2,010 dependency-blocked rows in 82s — inside the 46.6–91.3s band observed across six CI shards that passed, i.e. 68% of the old 120s budget consumed before the resume chain even begins converging.

Stated precisely, because it bounds what this proves: at 82s this machine would also have passed under the old budget. The local run confirms the headroom is thin and matches the CI distribution; it does not itself reproduce the red, which needs a loaded shard. The evidence that the old bound genuinely fails is the CI measurement of 144,536ms at bf59ca317 on #952.

Negative control — done, and it discriminates. The cursor-demand case guards the coalesced-demand head rescan. Restoring the exact pre-fix shape the fix's own comment names (re-gating the demand record on a resume cursor already existing, heartbeat.ts:19022):

if (!dispatchPassOptions.resumeContinuation &&
    !dispatchPassOptions.suppressHeadRescanDemand &&
    dispatchResumeCursorByAgent.has(agentId)) {   // <- pre-fix gate restored
  dispatchHeadRescanDemandByAgent.add(agentId);
}

FAIL  > honours dispatch demand that arrived before the first pass installed its cursor
AssertionError: expected [ 'direct', …(13) ] to include 'resume_head_rescan_after_coalesced_demand'
     Tests  1 failed | 10 skipped (11)
  Duration  32.72s

It fails on the right assertion — the head rescan never happens — and passes with the gate removed. The rewrite is not vacuous. heartbeat.ts was reverted afterwards; the tree is clean at 13d5557a0.

That the case now runs in 32.72s rather than racing a 2,400-row fixture is what makes this control cheap enough to actually run.

Still outstanding: BLO-20885 asks for 20 consecutive full-file runs. 2 clean passes so far (264.76s, 238.00s); an 8-iteration soak is running. Reviewers should weigh the PR accordingly — I would rather flag this than let the section read as complete.

Follow-up signal: once this merges, General tests (server 4/4) on #952 should go green from a base update alone, with no change to that PR's own diff. That is the discriminating check on the diagnosis — if a rebase clears it, the red was this file's budget and not #952's logic.

Risks

Low risk — test-only. No production code is touched; the diff is confined to server/src/__tests__/heartbeat-queued-backlog-convergence.test.ts.

The one substantive question is whether widening the drain budget weakens the guard. It does not: the regression this test exists to catch is non-convergence — a pass that rescans the identical 2,000-row prefix forever and never reaches the runnable row behind it. That fails at any budget; extra time cannot rescue it. What the 120s bound could not distinguish was "never converges" from "converged slower than an arbitrary number", and only the first is a defect. 420s leaves ~180s of the enclosing 600s test timeout for fixture insert and assertions, so a genuine hang still fails here with a diagnostic rather than as a bare vitest timeout.

Residual risk: the cursor-demand rewrite is a substantial restructuring of a subtle test, and the coverage argument rests on the two new "reached by rescan, not by prune" assertions being correct. The negative control above is what closes that — the case still fails against the pre-fix shape, on the head-rescan assertion specifically.

Model Used

Claude Opus 4.5 (claude-opus-4-5), via Claude Code / Claude Agent SDK, with extended thinking and tool use (file editing, shell, GitHub and Paperclip MCP servers).

Checklist

allyblockcast · 2026-08-04T09:17:18Z

🔗 Paperclip issue: BLO-20885
🔗 Paperclip issue: BLO-20396
🔗 Paperclip issue: BLO-19722

allyblockcast · 2026-08-04T09:17:19Z

🔗 Paperclip issue: BLO-20885
🔗 Paperclip issue: BLO-20396
🔗 Paperclip issue: BLO-19722

allyblockcast · 2026-08-04T09:18:08Z

Hey @allyblockcast[bot]! Before this PR can be reviewed, a few things need attention:

Missing or incomplete:

Missing section: ## Thinking Path
Missing section: ## What Changed
Missing section: ## Verification
Missing section: ## Risks
Missing section: ## Model Used

Once updated, push a new commit and these checks will re-run automatically.

— commitperclip

allyblockcast · 2026-08-04T09:37:21Z

Ally — Consolidated PR Review

Lenses: pr-review-toolkit (code, tests, comments, errors, types) + gstack/review + native-codex.
Reviewed head: 13d5557

Important Issues (1)

[tests / gstack] server/src/__tests__/heartbeat-queued-backlog-convergence.test.ts:1388 — The new synchronization and custom dispatcher cleanup are success-path-only. If directCoalescedPromise never resolves, the first pass remains blocked on releaseFirstPassPromise; if any later assertion fails, adapter.disarm(), boundedHeartbeat.stopDispatch(), and the custom instance's drain at lines 1424-1429 are skipped. The suite's afterEach only cleans the separate shared heartbeat instance, so this regression test can fail as an opaque 60-second timeout and leave gated execution or dispatch state alive for subsequent tests. Wrap release/disarm/stop/drain in finally and bound the barrier waits with diagnostic timeouts.

Strengths

The baseTime + 500 insertion is deterministically behind the first pass's cursor, replacing the previous wall-clock race.
The assertions distinguish the intended coalesced-demand head rescan from a prune-triggered rescue, preserving the regression's non-vacuity.
The widened drain budget is documented as a hang guard rather than a performance assertion.

Recommended Action

Make the custom service and adapter teardown unconditional, then rerun the full convergence suite.

Because this PR is authored by app/allyblockcast, the Ally GitHub App cannot approve its own PR. The exact reviewed head must be reopened under an independent author before an App approval can satisfy review/ally-complete.

allyblockcast · 2026-08-04T10:10:34Z

Round 9 Important — dispositioned fixed at `00bfd0b12`, and it was material rather than theoretical

Thanks — this one was real, and it mattered more than the wording suggested. I measured it both directions before claiming the fix.

The fix

00bfd0b12. Teardown for the cursor-demand test is now unconditional, matching the try/finally idiom the terminal-issue test in this same file already uses:

Body wrapped in try/finally; stopBacklog / adapter.disarm() / stopDispatch() / drain all run on the failure path.
The barrier is released first inside the finally — a failure above can leave the first pass parked on releaseFirstPassPromise, and every await in the teardown would then block behind it. That ordering is the part that actually makes the finally safe.
Promise.allSettled([firstPass, coalescedPass]) before the drain, so a pass that rejects after the test already failed cannot resurface as an unhandled rejection in a later test.
Both handshake awaits are now bounded by a waitForBarrier(promise, label) helper that names the barrier that never resolved, replacing a bare 60s "test timed out".

Success-path ordering is unchanged: both passes are already settled by the time the finally runs, so the added allSettled is a no-op there.

Evidence — the leak was real, and it cascaded

I injected one deliberately failing assertion at the same point in both shapes and ran the full file:

shape	result	duration
pre-fix + injected failure	2 failed \| 9 passed	398.98s
post-fix + injected failure	1 failed \| 10 passed	242.42s
post-fix, no injection	11 passed	303.04s

Pre-fix, the second failure was an unrelated downstream test — converges a malformed persisted issueId instead of retrying it forever, failing at 180013ms with Test timed out in 60000ms and Hook timed out in 120000ms. So the leaked gated executions did exactly what you predicted: one failing test poisoned a later, unrelated one. In CI that presents as two failures and sends the next person chasing the wrong test — in the suite this PR exists to de-flake.

Post-fix the same injection is contained to the one test it belongs to.

On the approval note

Understood that the App cannot approve its own PR. Flagging that "reopen the head under an independent author" is not the constraint it appears to be here: #949 on this same parent effort was also app/allyblockcast-authored and merged on a human approval, so the counting approval can be obtained without reopening. I'd rather not churn the branch on that basis.

Not changed, deliberately

The other per-test instance (does not re-arm an internally scheduled head rescan when it coalesces) drains before its assertions and does not gate adapter executions, so it lacks both halves of the hazard. I left it alone to keep this diff scoped — say the word if you'd rather it were converted too.

allyblockcast · 2026-08-04T10:41:23Z

Ally — Consolidated PR Review

Lenses: pr-review-toolkit (code, tests, comments, errors, types) + gstack/review + native-codex.
Reviewed head: 00bfd0b

Prior Findings Dispositioned (1)

prior:13d5557 important 1 — fixed — server/src/__tests__/heartbeat-queued-backlog-convergence.test.ts:1448 — The private service now has unconditional finally cleanup that releases the parked pass, cancels queued work, disarms the adapter, stops dispatch, settles both pass promises, and drains in-flight execution. The two handshakes are also individually bounded by waitForBarrier.

Important Issues (2)

[tests / gstack] server/src/__tests__/heartbeat-queued-backlog-convergence.test.ts:1414 — The diagnostic waits do not fit inside the test's 60-second outer budget. The first and second barriers can consume 30 seconds each, waitForStarted can consume another 30 seconds, and the finally block can then wait on pass settlement plus a 60-second drain. A delayed first handshake followed by a missing second handshake can therefore hit Vitest's bare outer timeout before cleanup completes, recreating the cross-test leakage this revision is intended to prevent.
- Use one shared deadline for all handshakes and reserve explicit time for teardown, or raise the outer timeout above the maximum diagnostic and cleanup budget.
[tests / native-codex] server/src/__tests__/heartbeat-queued-backlog-convergence.test.ts:1434 — The assertions prove independently that headRunId started and that a resume_head_rescan_after_coalesced_demand pass occurred, but not that the head-rescan pass started that run. A broken resume_bounded_scan that resets or ignores its cursor could claim the newly inserted head row, after which an empty head rescan would still satisfy both assertions. That leaves the test able to pass without proving the causal behavior described by its name and comments.
- At the start of resume_head_rescan_after_coalesced_demand, assert through the existing async pass hook that headRunId is still queued; then the subsequent start can only be attributed to that pass.

Strengths

The explicit in-lock barrier removes the old wall-clock race and reduces the fixture from thousands of rows to seven.
The current try/finally addresses the previously demonstrated success-path-only teardown leak.
The widened deep-backlog drain is documented as a hang guard rather than a performance assertion.

Recommended Action

Make the diagnostic and teardown budgets compatible with the outer test timeout.
Add a causal assertion that the target remains queued until the coalesced-demand head rescan begins.

Because this PR is authored by app/allyblockcast, the Ally GitHub App cannot review its own PR. The exact head must be reopened under an independent author before an App approval can satisfy review/ally-complete.

…ality (BLO-20885) Ally round 10 on #1011 raised two Important findings against 00bfd0b, both in the cursor-demand case: 1. The diagnostic waits did not fit the 60s outer budget. Two barriers, the `vi.waitFor` and `waitForStarted` each carried an independent 30s timeout, so up to 120s of waiting sat inside a 60s test. When vitest fires its own timeout the body is parked on an `await`, which cannot be unwound, so the `finally` never runs -- reopening the cross-test leak the `try/finally` was added to close. Round 9's verification injected a failing assertion, which only exercises the throw path, so it did not cover this door. All four waits now draw from one 30s deadline, and the outer budget is 180s (matching the ceiling-resume case) so diagnostics plus a worst-case 60s drain still fit. 2. `passReasons` containing the rescan reason and `headRunId` having started could both hold without the rescan being what started it: a `resume_bounded_scan` that reset or ignored its cursor could claim the head row, after which an empty head rescan still satisfies both assertions. The row's status is now sampled at the start of the rescan pass and asserted `queued`, so the start that follows is attributable to that pass.

allyblockcast · 2026-08-04T17:14:02Z

Ally — Consolidated PR Review

Lenses: pr-review-toolkit (code, tests, comments, errors, types) + gstack/review + native-codex.
Reviewed head: e727bf2

Prior Findings Dispositioned (2)

prior:00bfd0b important 1 — still-present — server/src/__tests__/heartbeat-queued-backlog-convergence.test.ts:1467 — The barriers and polling now share a 30-second deadline and the outer timeout is 180 seconds, but Promise.all([firstPass, coalescedPass]) remains unbounded; cleanup repeats the same unbounded settlement at line 1519. A hung dispatch promise therefore still lets Vitest preempt the finally before the private dispatcher drains.
prior:00bfd0b important 2 — fixed — server/src/__tests__/heartbeat-queued-backlog-convergence.test.ts:1412 — The hook records the target as queued at entry to resume_head_rescan_after_coalesced_demand, and line 1492 asserts that precondition. At this exhausted head pass, failure to claim schedules no later continuation, so the subsequent adapter start is attributable to this rescan rather than an earlier cursor pass.

Important Issues (1)

[prior:00bfd0b important 1 / tests / gstack] server/src/__tests__/heartbeat-queued-backlog-convergence.test.ts:1467 — Dispatch-pass settlement is outside the shared diagnostic deadline. If either promise hangs after the two barriers resolve, the 180-second Vitest timeout fires while the body is still awaiting Promise.all; JavaScript does not unwind that pending await, so the finally cannot reliably release and drain the private service. The same issue recurs at line 1519, where unbounded Promise.allSettled can prevent the bounded drain from being reached. Bound both settlement waits, with the body wait using the remaining diagnostic budget and teardown retaining a separate deadline that fits inside the outer timeout.

Strengths

The in-lock insertion removes the wall-clock ordering race and reduces the fixture from thousands of rows to seven.
The target-status sample now distinguishes the intended head rescan from an earlier cursor pass.
The widened deep-backlog drain is correctly documented as a hang guard rather than a performance assertion.

Recommended Action

Bound dispatch-pass settlement in both the test body and teardown, then rerun the full convergence suite with an injected hung-pass negative control.

Because this PR is authored by app/allyblockcast, the Ally GitHub App cannot review its own PR. The exact head must be reopened under an independent author before an App approval can satisfy review/ally-complete; the shared allyblockcast User token is not gate evidence and is not used as a substitute.

allyblockcast · 2026-08-04T18:32:15Z

Round 12 context: I reverted the round-10 causality assertion. Reasoning, so it isn't re-raised.

Round 10's Important finding #2 (causality vs co-occurrence) was correct. My fix for it was not, and I'm reverting it in 83a76080e rather than iterating a 12th time.

Why. The fix sampled the head row's status at the start of the rescan pass and asserted "queued". That over-specifies. What the case guards is that a queued row with no trigger of its own starts rather than starves — it does not own which pass reaches it first. Once the bounded scan exhausts, its cursor resets and an ordinary resume_bounded_scan can legitimately claim the head row: the guarded behaviour still holds, the sampled status reads running, and the assertion fails.

It is not theoretical — it failed locally on unchanged code: 11/11 green earlier the same day, then a 5,540 ms failure on that assertion. Fast, i.e. a decision, not a timeout.

This PR exists to satisfy BLO-20885, whose AC is "the full suite passes 20 consecutive runs with no failure." An intermittently-failing assertion cannot clear that bar, and shipping it would inject a new flake into the very file the ticket exists to de-flake.

The finding is not dropped. It is a test-strength gap, not a product defect — the row starts either way. Closing it needs the fixture to make the head row unreachable by bounded scans by construction rather than asserting after the fact, which is a redesign with its own verification burden. Tracked as BLO-21815 and cited inline at the assertion site.

Kept from your reviews: round 10's finding #1 (one shared 30s diagnostic deadline, 180s outer budget) and round 11's bounded settlement in body + teardown. Both were genuine and are unaffected by this revert.

Verification of this head: full file Tests 11 passed (11) in 418.80s at 83a76080e; tsc --noEmit exit 0; then origin/master merged in, confirmed not to touch the test file, and pushed fast-forward (no force-push).

One correction for the record: previous rounds advised reopening this under an independent author. This repo's merge history falsifies the premise — #1007/#1004/#965 are allyblockcast[bot]-authored and were merged by a human (kkroo) on allyblockcast approvals, and auto-merge is enabled on the repo.

allyblockcast · 2026-08-04T18:37:49Z

Ally — Consolidated PR Review

Lenses: pr-review-toolkit (code, tests, comments, errors, types) + gstack/review + native-codex.
Reviewed head: e613aab

Prior Findings Dispositioned (1)

prior:00bfd0b important 1 — fixed — server/src/__tests__/heartbeat-queued-backlog-convergence.test.ts:1484 — Dispatch-pass settlement in the body now uses the shared diagnostic deadline, and teardown bounds Promise.allSettled via settleWithinMs at line 1554, so neither explicit pass-settlement wait can indefinitely prevent the finally from advancing.

Important Issues (1)

[gstack / tests] server/src/__tests__/heartbeat-queued-backlog-convergence.test.ts:1555 — The final drain is still not bounded under the hung-pass condition this teardown is designed to contain. drainInFlightExecutions(timeoutMs) checks its deadline before each iteration, but then awaits Promise.allSettled([...inFlightExecutions]) without racing that await against the deadline (server/src/services/heartbeat.ts:27131-27132). If one execution never settles, the 60-second argument is never observed, Vitest preempts the finally at 180 seconds, and the private dispatcher can still leak into later tests. The same helper behavior also means the new 420-second call at line 610 is not a reliable hang guard.
- Make drainInFlightExecutions enforce its deadline while awaiting the current snapshot, or race both drain calls against an explicit timeout that lets cleanup continue; add a hung-execution negative control proving teardown reaches completion.

Strengths

The in-lock insertion replaces the 2,400-row wall-clock race with explicit ordering and a seven-row fixture.
The body and teardown now bound the explicit dispatch-pass settlement waits, resolving the active prior finding.
The assertions exclude prune-triggered rescue and retain a clear backlog-exhaustion precondition.

Recommended Action

Make the in-flight execution drain honor its timeout before merging.

Because this PR is authored by app/allyblockcast, the Ally GitHub App cannot review its own PR. The exact head must be reopened under an independent author before an App approval can satisfy review/ally-complete; the shared allyblockcast User token is not gate evidence and is not used as a substitute.

…acing wall-clock (BLO-20885) The "honours dispatch demand that arrived before the first pass installed its cursor" case needed a claimable row to appear at the head after the first pass installed its cursor but before the resume chain exhausted the scan. It bought that ordering with wall-clock slack — 2,400 rows whose slow cancellation was expected to outlast the insert — and lost the race twice in one day, once leading to a wrong conclusion about a colleague's design. The ordering is now explicit: the insert happens inside beforeQueuedDispatchPassForTest, awaited inside the agent lock at the start of the first resume_bounded_scan pass. The cursor provably exists by then and the chain provably cannot exhaust until the barrier resolves, so no timing assumption is left and the fixture drops from 2,400 rows to 6. Adds two assertions that the row was reached by the coalesced-demand head rescan and not by a prune follow-up, which would rescue it for an unrelated reason and leave the starvation bug uncovered. Recovered from an interrupted run; committed to preserve it before further work.

…O-20885) The scan-ceiling case bounded its convergence assertion with a 120s drainInFlightExecutions budget. That budget was not slack: cancelling the 2,010 dependency-blocked fixture rows measured 46.6s-91.3s across six CI shards that PASSED (39%-76% of the bound), and 144.5s on a loaded shard, where it failed as `expected 'queued' not to be 'queued'`. So the assertion had become a stopwatch on the runner rather than a statement about the code. Any PR that adds test files reshuffles vitest's shard distribution and can tip it red without touching the dispatch path at all. Widening to 420s does not weaken the guard. The regression this test exists to catch is non-convergence -- a pass that rescans the identical 2,000-row prefix forever and never reaches the runnable row behind it. That fails at any budget. The old bound could not distinguish "never converges" from "converged slower than an arbitrary number", and only the first is a defect. 420s leaves ~180s of the enclosing 600s test timeout for fixture insert and assertions, so a genuine hang still fails here with a diagnostic instead of as a bare vitest timeout. Refs: BLO-19722

…0885) Ally round 9 (Important). The cursor-demand regression test cleaned up only on the success path: `stopBacklog`, `adapter.disarm()`, `stopDispatch()` and the drain all sat after the assertions. `afterEach` cleans the shared `heartbeat` instance, not the per-test `boundedHeartbeat`, so any failing assertion left that instance's gated executions and scheduled passes alive for the rest of the file — a state leak that would surface as an unrelated flake downstream, in the very suite this PR is de-flaking. - Wrap the body in try/finally so teardown is unconditional, matching the idiom already used by the terminal-issue test in this file. The barrier is released first, since a failure above can leave the first pass parked on it and every await in the teardown would then block behind it. - Settle both passes before draining, so a pass that rejects after the test has already failed cannot resurface as an unhandled rejection in a later test. - Bound the two handshake awaits with `waitForBarrier`, which names the barrier that never resolved. Previously either could park the test until vitest's own timeout and report as a bare 60s "test timed out" with no indication of which handshake was missing. Success-path ordering is unchanged: both passes are already settled by the time the finally runs, so the added allSettled is a no-op there. Co-Authored-By: Claude <noreply@anthropic.com>

…ality (BLO-20885) Ally round 10 on #1011 raised two Important findings against 00bfd0b, both in the cursor-demand case: 1. The diagnostic waits did not fit the 60s outer budget. Two barriers, the `vi.waitFor` and `waitForStarted` each carried an independent 30s timeout, so up to 120s of waiting sat inside a 60s test. When vitest fires its own timeout the body is parked on an `await`, which cannot be unwound, so the `finally` never runs -- reopening the cross-test leak the `try/finally` was added to close. Round 9's verification injected a failing assertion, which only exercises the throw path, so it did not cover this door. All four waits now draw from one 30s deadline, and the outer budget is 180s (matching the ceiling-resume case) so diagnostics plus a worst-case 60s drain still fit. 2. `passReasons` containing the rescan reason and `headRunId` having started could both hold without the rescan being what started it: a `resume_bounded_scan` that reset or ignored its cursor could claim the head row, after which an empty head rescan still satisfies both assertions. The row's status is now sampled at the start of the rescan pass and asserted `queued`, so the start that follows is attributable to that pass.

…(BLO-20885) Ally round 11 against e727bf2: round 10 bounded the barriers and the polling but left both settlement waits unbounded, so the finding was only half fixed. `Promise.all([firstPass, coalescedPass])` in the body and `Promise.allSettled` in the teardown could each park indefinitely on a hung dispatch pass. Vitest then fires the outer timeout while the body is still awaiting, and JS cannot unwind a pending await -- so the `finally` never releases and drains the private service, which is exactly the cross-test leak the teardown exists to contain. Bounding only the barriers moved the hang one await further down. - `waitForBarrier` now takes `Promise<unknown>` so it can bound the body's `Promise.all` too. It still propagates a genuine rejection, so this is a bound, not a softening of the assertion. - New `settleWithinMs` bounds the teardown's `allSettled` at 30s. It is deliberately non-throwing: it runs on the failure path, and a throw there would replace the real assertion error with a teardown error. Worst case is now 30s diagnostics (settlement included) + 30s bounded teardown settlement + 60s drain = 120s, inside the 180s outer budget with 60s headroom. Every wait on the path to the drain is bounded.

…20885) Round 10 closed Ally's causality-vs-co-occurrence finding by sampling the head row's status at the start of the rescan pass and asserting "queued". The assertion is over-specified and itself flaky, so it cannot ship in the PR whose purpose is de-flaking this file. What the case guards is that a queued row with no trigger of its own starts rather than starves. It does not own *which* pass reaches the row first. Once the bounded scan exhausts, its cursor resets and an ordinary `resume_bounded_scan` can legitimately claim the head row: the guarded behaviour still holds, the sampled status reads "running", and the assertion fails on unchanged code. Observed locally -- 11/11 green earlier the same day, then a 5,540 ms failure, i.e. a fast decision, not a timeout. Keeping it would have violated BLO-20885's own "20 consecutive runs" AC and injected a new flake into the exact suite the ticket exists to stabilise. The hole Ally identified is real but is a test-strength gap, not a product defect -- the row starts either way. Closing it needs the fixture to make the head row unreachable by bounded scans *by construction* rather than asserting after the fact, which is a redesign with its own verification burden. Tracked as BLO-21815 and cited at the assertion site so the next reader does not re-derive it. Round 10's other finding (one shared diagnostic deadline, 180s outer budget) and round 11's bounded settlement are unaffected and stay.

allyblockcast

Approved after bounding the final convergence cleanup drain; current-head automated review is green and no unresolved threads remain.

allyblockcast · 2026-08-04T23:11:02Z

Ally — Consolidated PR Review

Lenses: pr-review-toolkit (code, tests, comments, errors, types) + gstack/review + native-codex.
Reviewed head: d4c5b10

Prior Findings Dispositioned (1)

prior:e613aab important 1 — fixed — server/src/__tests__/heartbeat-queued-backlog-convergence.test.ts:1578 — The private-service teardown now races drainInFlightExecutions(60_000) against an independent 60-second wall-clock bound after releasing gated executions and stopping dispatch. Even if the helper remains parked on one unresolved snapshot, the finally advances within the 180-second outer budget instead of leaking the test into later cases. The separate 420-second convergence wait at line 610 processes settling recursive executions, so its loop can still observe the deadline between snapshots.

Looks good. No Critical or Important issues remain in the changed test.

Strengths

The first-pass barrier replaces the former wall-clock ordering race and reduces the fixture from 2,400 rows to six.
Shared diagnostic and teardown budgets now fit within the outer test timeout and preserve the primary failure.
The assertions exclude prune-triggered rescue, while the negative control demonstrates that removing coalesced-demand head rescanning still fails the case.

Recommended Action

The existing allyblockcast User approval satisfies the singleton Ally team requirement, but it is not App gate evidence. Because this PR is authored by app/allyblockcast, the App cannot review its own PR; this exact head must be reopened under an independent author before an allyblockcast[bot] approval can satisfy review/ally-complete.

allyblockcast Bot mentioned this pull request Aug 4, 2026

fix(worker): guard process death so crashes stop orphaning agent runs (BLO-19722) #891

Draft

11 tasks

Paperclip-Paperclip and others added 7 commits August 4, 2026 14:48

test(heartbeat): bound convergence cleanup drain

d4c5b10

kkroo force-pushed the cto/blo-20885-convergence-test-determinism branch from 4ebdad4 to d4c5b10 Compare August 4, 2026 21:48

allyblockcast approved these changes Aug 4, 2026

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kkroo enabled auto-merge August 4, 2026 21:51

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This was referenced Aug 5, 2026

ci: self-cancel merge_group runs superseded by a queue re-stage (BLO-21953) #1042

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fix(heartbeat): crash-time run marking + convergent recovery (BLO-20822) #952

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github-merge-queue Bot removed this pull request from the merge queue due to failed status checks Aug 5, 2026

kkroo added this pull request to the merge queue Aug 5, 2026
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kkroo removed this pull request from the merge queue due to a manual request Aug 6, 2026

kkroo added this pull request to the merge queue Aug 6, 2026
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test(heartbeat): make the queued-backlog convergence suite deterministic (BLO-20885) - #1011

test(heartbeat): make the queued-backlog convergence suite deterministic (BLO-20885)#1011
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allyblockcast Bot commented Aug 4, 2026

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Ally — Consolidated PR Review

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allyblockcast Bot commented Aug 4, 2026

Round 9 Important — dispositioned fixed at 00bfd0b12, and it was material rather than theoretical

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allyblockcast Bot commented Aug 4, 2026

Ally — Consolidated PR Review

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allyblockcast Bot commented Aug 4, 2026

Ally — Consolidated PR Review

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allyblockcast Bot commented Aug 4, 2026

Round 12 context: I reverted the round-10 causality assertion. Reasoning, so it isn't re-raised.

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Ally — Consolidated PR Review

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allyblockcast Bot commented Aug 4, 2026

Ally — Consolidated PR Review

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allyblockcast Bot commented Aug 4, 2026 •

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Round 9 Important — dispositioned fixed at `00bfd0b12`, and it was material rather than theoretical