fix(preflight): postpone a rate-limited account's candidates instead of banning them - #1957
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…of banning them #1949's account rule sets aside an account's remaining candidates after two consecutive 429s. When a walk runs out of candidates it is willing to probe it ENDS -- with probe budget in hand and the readiness target unmet -- and the stage fails closed; because deferral needs one ready route (#1947), nothing is served either. Sixteen sidecar artifacts were collected on 2026-09-06 across .github, argos, bandscope and naruon; fourteen ran the merged rule (argos 34013128112 and bandscope 34013146167 still carry the pre-#1949 report shape). Those fourteen fall into three classes, not two: eight boots at probed/skipped/ready 16/4/5-6 spend the whole budget in the first pass and are unchanged by this commit; ONE (argos 34014143870, 06:56Z) reads 12/12/3 -- it served, yet exhausted its candidates under target with four probes unspent; five read 6/18/0 and failed closed. The sixth ready route in the healthy class (llama-3.2-11b on the second NVIDIA key, catalog position 17, ready in exactly those eight artifacts) is reached only because four OpenRouter probes were set aside -- the rule's designed benefit, which this commit keeps. .github run 34016207820's six probes were refused 429 between 07:49:35.111Z and 07:49:35.767Z; because the walk round-robins three accounts, "two consecutive 429s" on one account is two requests about 310 ms apart (nvidia_nim at .111 and .422). keyverse#143's 08:20Z noema repeated the shape in a second repository. A refusal is not a verdict on the account: run 34016093772 was inside its own preflight during that burst and its llama-3.2-11b probes on the same two NVIDIA keys answered ready at 07:50:58.7Z and 07:50:59.0Z, 84 s after those keys refused. Not claimed: that the ten unspent probes would have found a ready route inside the burst. No artifact answers it, which is why this also records retry_after_s. The change rests on the structural defect alone. A set-aside candidate is now postponed to the end of the walk; once the first pass ends under target with budget left, the postponed candidates are probed in catalog order until the sixteen-probe budget is spent. Both passes share one stop condition, so probes per stage stay <= 16, and exhaustion uses a dedicated sentinel so a None candidate cannot truncate the walk. The second pass never draws on the shared escalation budget (#1458): a postponed candidate answering "budget too small" is rejected as escalation_reserved_for_first_pass, because otherwise candidates the previous design never probed take escalations from the priced stage that had them, and a measured two-stage run stops serving a route it used to serve. _safe_retry_after_seconds records a refused probe's Retry-After as retry_after_s when it is whole delta-seconds in range. It gates on isdecimal, not isdigit: the header is provider-controlled, "²".isdigit() is True while int() on it raises, and this runs inside the probe walk's exception handler whose callers catch only ReviewPreflightError -- so a ValueError there would kill the boot before any evidence file is written. No code waits on the value (ADR-0003). Cost, stated in the ADR and PR body against the 60-job ceiling work: about 120 ms per refused probe, up to 10 x 90 s ~= 15 minutes when the postponed tail is silent (gemma-4-31b answered TimeoutError in 15 of the 19 probes that reached it), and 8 -> 24 requests on the two-stage auto path, where the priced stage doubles from 4 probes to 8. All inside the probe budget ADR-0029 bounds. Report: postponed_probed_count added, skipped_count now means "postponed and never reached". ADR-0029 amended, and its two superseded sentences marked in place. Verified by a three-lens adversarial refutation before push (control flow, evidence and design, test fidelity): all three returned refuted=true with 20 findings, each reproduced against the artifacts before acting. The blocker above, the escalation-budget regression, the miscounted evidence table, the false "healthy-minute walk is unchanged" claim, the 310 ms spacing, the sibling run's real relationship to the burst and the superseded ADR sentences all come from that pass. Gate on this tree: 2945 passed, 1 skipped, 21 subtests; coverage 100% (0 missed); interrogate 100%. Negative control on origin/main's launcher with this test file: 8 failed, 93 passed. Refs #1948, #1949. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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| if ( | ||
| not budget_signature | ||
| or second_pass | ||
| or escalations_used >= REVIEW_PREFLIGHT_MAX_ESCALATIONS |
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🟡 Postponed reasoning routes stay unavailable
A postponed candidate with a budget-too-small response is rejected without REVIEW_PREFLIGHT_ESCALATED_TOKENS. The production free pool has no later stage, so preflight can fail while its escalation budget remains unused.
Prompt for agents
The second-pass branch in _preflight_review_agents rejects every budget-signature response as escalation_reserved_for_first_pass. This preserves escalation capacity for a possible priced fallback, but the function does not know whether a fallback exists. The production orchestrator/free call has no fallback stage, so available escalation capacity is discarded and a postponed reasoning route that would succeed at REVIEW_PREFLIGHT_ESCALATED_TOKENS cannot make the stage viable. Preserve capacity only when a later stage actually needs it, or pass an explicit reservation policy from _preflight_with_fallback while allowing the sole free stage to use remaining escalations.
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| if not isinstance(raw, str) or not raw.strip().isdecimal(): | ||
| return None | ||
| seconds = int(raw.strip()) | ||
| return seconds if 0 <= seconds <= 86400 else None |
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🟡 Oversized retry headers abort startup
An oversized decimal Retry-After passes isdecimal() but makes int() raise at Python's digit limit. The error escapes preflight handling and prevents the evidence report.
| if not isinstance(raw, str) or not raw.strip().isdecimal(): | |
| return None | |
| seconds = int(raw.strip()) | |
| return seconds if 0 <= seconds <= 86400 else None | |
| stripped = raw.strip() | |
| if not isinstance(raw, str) or not stripped.isdecimal() or len(stripped) > 5: | |
| return None | |
| seconds = int(stripped) | |
| return seconds if 0 <= seconds <= 86400 else None |
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| "ready_count": len(viable), | ||
| "deferred_count": len(deferred), | ||
| "rejected_count": len(routes) - len(viable) - len(deferred), | ||
| "skipped_count": skipped, | ||
| "skipped_count": len(postponed) - postponed_probed, | ||
| "postponed_probed_count": postponed_probed, | ||
| "target_ready": REVIEW_PREFLIGHT_TARGET_READY, | ||
| "probe_budget": REVIEW_PREFLIGHT_MAX_PROBES, | ||
| "account_skip_after_429": REVIEW_PREFLIGHT_ACCOUNT_SKIP_AFTER_429, |
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🔍 Probe count hides escalation requests
probed_count counts candidates, while first-pass escalation sends an additional provider request. Operational evidence can understate actual request volume when interpreting the 16-probe budget.
(Refers to this code)
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| if second_pass: | ||
| postponed_probed += 1 | ||
| elif consecutive_429.get(account, 0) >= REVIEW_PREFLIGHT_ACCOUNT_SKIP_AFTER_429: | ||
| postponed.append(agent) | ||
| continue | ||
| # Cleared here; only a 429 answer below restores it, incremented. | ||
| streak_429 = consecutive_429.pop(account, 0) |
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📝 Info: Postponed accounting remains aligned
postponed_probed increments once per second-pass candidate. Every outcome appends one matching row, preserving report counts and deferred-agent pairing.
(Refers to this code)
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[P1] Please do not merge the second-pass change while it expands the priced-fallback path. The PR body, CHANGELOG, and ADR-0029 explicitly measure the two-stage The standing central model-action contract is A minimally bounded repair is to prove the postponed second pass applies only to the released free-pool contract and cannot increase or activate a priced stage. Preserve fail-closed zero-ready behavior and the raw preflight receipt; do not solve this by spending paid credit, widening provider/model/group configuration, or treating more probes as a security verdict. If that separation cannot be expressed without retaining the legacy local provider catalog, this change should wait behind the immutable CO gateway migration rather than encoding a larger paid fallback budget. |
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Independent verification of My figures, run here, match the author's exactly: full gate 2945 passed, 1 skipped, 21 subtests; Checks I ran as behaviour rather than reading:
The cost paragraph reads honestly — fast refusals at roughly 120 ms leave the second pass near free, silent postponed candidates can add up to ten recv timeouts, and both stay inside the probe budget rather than a clock. The lever named for a bad census ( Ready for the merge step by the third session. |
On the
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…e-skipped-candidates # Conflicts: # CHANGELOG.md
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Re-verified on What changed and what did not: the delta from the head I verified ( I still ran the suite on the new head rather than resting on that identity argument, because only a merged tree exercises this branch's launcher together with the contract tests #1958 added: 2946 passed, 1 skipped, 21 subtests, coverage 100% (13181 statements, 5326 branches, 0 missed), interrogate 100% — matching the author's figures, and one higher than the pre-merge 2945 for exactly the test that arrived with So the earlier verification stands in full: the probe budget holds across both passes (24 all-429 candidates → exactly 16 probes; mixed → 14 with ready at target), |
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Merged as Verified by the merging session's own run, not relayed. Because The ceiling is untouched, which I verified rather than accepted. The diff changes no Two defects the author's own adversarial verification caught and fixed before this head: Authorization, cited at the act from the standing directive: "60-job ceiling에 막혀 있을 거라 일을 하기 어렵다면 60-job ceiling을 만드는 workflow issues를 추적해서 해소하세요. 이 상황은 Chicken-and-eggs 상황이므로 Bypass merge가 허용됩니다." This addresses the ceiling rather than merely being blocked by it: a preflight that abandons ten of its sixteen probes inside a sub-second 429 burst spends a runner slot to produce nothing, and the boots measured for this change failed closed in exactly that way. Confined to the sidecar launcher, its tests, ADR-0029 and CHANGELOG; no workflow, pinned or policy file; not dirty. I checked the one thing that would have made this the owner's call rather than mine — whether it raises the per-boot request ceiling — and it does not. Author host 1, verification peer 1, merge by this session: three separate sessions. |
Changelog prepend siblings again: this branch's entry stays on top as the not-yet-merged change, with #1957's entry below it in merge order. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Resolves the CHANGELOG.md prepend collision with #1957 by keeping both sections: main's "Review sidecar preflight postpones a rate-limited account's candidates" is preserved verbatim, along with #1958's section merged in the previous round, and this branch's "Required status context guard" section is re-prepended above them. Verified after resolution: no conflict markers, 0 of main's CHANGELOG lines dropped, this branch's section present exactly once, both incoming sections preserved, and the diff against origin/main unchanged at CHANGELOG.md +5 and tests/test_branch_protection_required_context_jobs.py +130. #1957 touched no workflow file, so no pinned job name moved. Gates on the merged tree: 2949 passed / 1 skipped / 21 subtests, coverage 100% (0 missed), interrogate 100%. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
First post-merge sample: the second pass rescued a boot that would have failed closed
Its first pass is the burst class exactly: six probes, all
Every ready route came from the second pass. Under the merged rule this boot would have stopped at row 6 with the budget two-thirds unspent, and — because deferral requires one ready route — would have deferred nothing either. Instead it served three ready routes with eight deferred behind them, and the provisioning step passed. The run still failed, but downstream of preflight, which is the capacity class rather than this one. This is one boot, not a rate. What it does settle is the thing this pull request explicitly declined to claim. The body said: "Not claimed: that the ten unspent probes would have found a ready route inside that burst. No artifact answers it." One now does, for this boot: they did. The cost did not materialize here. The Cost table bounded the worst case at ten silent probes ≈ 15 minutes. These ten answered fast (
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Independent pre-merge specimen of the exact defect this fixes, plus a triage caveat for anyone reading post-merge failures.
Six 429s in 678 ms (12:00:31.883 → 12:00:32.561), two per account across The caveat. That run executed at 12:00Z — 23 minutes after this PR merged (11:37:30Z) — so it reads at a glance like the fix not working. It isn't. The run was created at 10:24:07Z and waited ~94 minutes for a runner. The report itself distinguishes the two versions unambiguously: a pre-#1957 report has no So for the next few hours of triage: classify a preflight failure against the launcher version implied by the run's One adjacent datum on why the pool state is genuinely volatile rather than dead: Generated by Claude Code |
Discriminator (c) answered: the healthy-minute walk is unchanged in productionThe last open check on this change was whether an ordinary-minute boot costs anything under the new code.
The cost in this boot is real but not from this changeProvisioning took 14:06:21Z → 14:21:17Z (14m56s), with probes spanning 14:11:57.781Z to 14:20:52.245Z. The reason is visible in the rows: four probes answered All four are in the first pass. The old launcher probed the same sixteen candidates in a healthy boot, so this cost is pre-existing and would have been paid identically before this change. What the Cost table warned about was ten additional silent probes in a second pass; here the second pass did not run at all. Cross-checks from the same artifact
Where the after-samples standFive boots now carry the field: ready 3, 1, 1, 1 in four burst boots whose second pass ran, and ready 6 in this healthy boot where it did not. Reporting only the best of them would overstate the effect; the honest summary is that the change converts 🤖 Measured by Claude Code |
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Post-merge production result, as promised. The provisioning shape this PR targets is gone from the window; what remains is a different class. All The 18 cancelled are concurrency supersedes, not outcomes. Of the 7 that reached a terminal verdict, 4 succeeded — the first being The three failures, by annotation:
Zero of the three are the That matters for where the next fix goes. The residual class is the serving stall: one route admitted, One caveat on the sample: 14 of the 42 are still queued and 3 in progress, so this is the first ~50 minutes of post-fix evidence, not a settled rate. I'll re-read once my own queued heads ( Generated by Claude Code |
Mechanism note: the second pass gains breadth, not timeWorth pinning before anyone reasons about this later, because the two explanations look alike and only one is possible. Measured on the burst boot ( All sixteen probes finish inside one second. Against that, the refusal window measured on a single route lasted 3 m 32 s: So when a burst boot ends with one to three ready routes, that is not the burst having passed. It is the second pass probing different candidates — the ones the account rule had set aside, which in these artifacts are the gemma and llama rows rather than the deepseek and OpenRouter rows that were refused. The gain is breadth within the burst, not elapsed time. This also states more precisely why the delayed second pass stays out of scope. A delay would add a second, different benefit that this change does not provide, and the measured burst length says such a delay could plausibly help. What blocks it is unchanged: Credit for the correction to the lane that measured the 66 ms gap; my earlier figure of about 1.2 s for ten refused probes was the cost of the second pass, not its offset, and the two are easy to conflate. 🤖 Measured by Claude Code |
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Correction to my earlier comment, and the first post-merge preflight artifact — which confirms this fix works. The correction first. I wrote that the residual failures are "one route admitted, Related, and it affects how those annotations should be read: I am also downgrading the "~1800 s clustering" reading I recorded privately and never posted: since those durations span an internal failover walk rather than one model call, they are not evidence of an upstream per-call ceiling. Now the artifact.
Every one of those moved the way this PR intended: the postponed tail is probed, transient 429s defer instead of banning the account, the full budget is spent, and the walk finds a ready route where the pre-fix walk stopped at zero. This is the direct A/B I said I would produce. Where it still falls short is One measurement from the same log, offered because it pins a number this discussion keeps estimating. Preflight probes of Updated tally, terminal Generated by Claude Code |
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Summary
#1949's account rule ("after two consecutive 429s, set the account's remaining candidates aside") has a second effect its design did not measure: when a walk runs out of candidates it is willing to probe, it ends — with probe budget still in hand and the readiness target unmet — and the stage fails closed. This PR keeps the rule's benefit and removes that failure mode. A set-aside candidate is postponed to the end of the walk, not banned; once the first pass ends under target with budget left, the postponed candidates are probed in catalog order until the sixteen-probe budget is spent.Evidence
Sixteen sidecar artifacts were collected on 2026-09-06 across
.github,argos,bandscopeandnaruon. Fourteen ran the merged rule; two (argos34013128112,bandscope34013146167) still carry the pre-#1949report shape and are excluded. The fourteen fall into three classes.probed / skipped / readyllama-3.2-11bon the second NVIDIA key, catalog position 17, ready in exactly these 8) is reached only because four OpenRouter probes were set aside — the rule's designed benefitargos34014143870, 06:56Z)rejected 6, all 429).githubStrix run 34016207820, sidecar stderr: six probes (deepseek-v4-flashand-proon both NVIDIA keys, two OpenRouter free routes) refused 429 between 07:49:35.111Z and 07:49:35.767Z. Because the walk round-robins three accounts, "two consecutive 429s" on one account is two requests about 310 ms apart (nvidia_nimat .111 and .422). Ten of sixteen probes went unspent, and since deferral requires one ready route (#1947) nothing was served either. The five boots of this class began probing between 07:24:50Z and 08:04:41Z.keyverse#143,noema-reviewat 08:20Z: six probes, 08:20:12.947Z to 08:20:13.316Z, all 429,ready 0, stepProvision contextual-orchestrator review sidecarfailed. (Read from the job log, not the attached artifact set.)llama-3.2-11bprobes on the same two NVIDIA keys answered ready at 07:50:58.7Z and 07:50:59.0Z — 84 seconds after those keys refused 429. That boot endedprobed 16 / ready 5.#1949boots failed similar windows for a different reason (.githubruns 34006939646 / 34008191123 / 34008575125, 04:24–05:11Z: the same six 429s, then six gemma 404s,ready 0atprobed 12). This is the ban meeting a 24-candidate list whose tail it can no longer reach.Not claimed: that the ten unspent probes would have found a ready route inside the burst. No artifact answers it, because nothing records how long a refusal lasts — hence
retry_after_sbelow. The change rests on the structural defect: ending a walk under target with two thirds of the budget in hand.Change (
scripts/ci/contextual_orchestrator_review_launcher.py)postponedlist instead of being dropped. When the first pass runs out of candidates withready < REVIEW_PREFLIGHT_TARGET_READYandprobed < REVIEW_PREFLIGHT_MAX_PROBES, the walk continues overpostponedin catalog order (no account rule there) until the budget is spent. Both passes share one stop condition, so probes per stage stay ≤ 16. Exhaustion uses a dedicated sentinel, notNone, so aNonecandidate cannot truncate the walk.REVIEW_PREFLIGHT_MAX_ESCALATIONSis one counter for the whole run, carried into the priced fallback stage (#1458). A postponed candidate answering with the budget-too-small signature is rejected asescalation_reserved_for_first_passinstead of escalating; otherwise candidates the previous design never probed take escalations from the priced stage that had them, and a measured two-stage run stops serving a route it used to serve._safe_retry_after_seconds(exc): records a refused probe'sRetry-Afterasretry_after_swhen it is whole delta-seconds in range. It gates onisdecimal, notisdigit— the header is provider-controlled,"²".isdigit()is True whileint("²")raises, and this runs inside the probe walk's exception handler whose callers catch onlyReviewPreflightError, so aValueErrorthere would kill the boot before any evidence file is written. No code waits on the value (ADR-0003); it exists so the next census can say whether a delayed second pass is worth proposing.postponed_probed_countadded;skipped_countnow means "postponed and never reached", socandidate_count − probed_count − skipped_countkeeps its meaning.Cost (stated for the 60-job ceiling trade-off)
#1661run 34008191123, both keys'deepseek-v4-proat 90.06 s and 90.10 s)This spends budget that was already allocated; it does not raise any ceiling. No constant changes in this PR (
git diff origin/main -- scripts/ci/contextual_orchestrator_review_launcher.py | grep '^[-+]REVIEW_PREFLIGHT_'is empty), and the sidecar script and composite action are untouched, soORCHESTRATOR_CATALOG_LIMITkeeps its default too.REVIEW_PREFLIGHT_MAX_PROBESis 16, hard-coded, with no environment override anywhere inscripts/or.github/. Both passes share one budget — a single loop condition,len(viable) >= TARGET_READY or len(routes) >= MAX_PROBES, over onerouteslist — so probes per stage stay ≤ 16 on every input. And ADR-0029 onmain, written when#1949merged, already accepted exactly this envelope: "the sidecar sends up to 16 probes per stage where it sent 12 … a fully silent hour costs at most 16 × 90 s = 24 minutes". The ~15-minute worst case above sits below that accepted bound. What rises is consumption toward the existing ceiling in bad hours (about 6 → up to 16 per stage when everything is refused), which is the change itself:#1949's rule made the walk spend less than its budget and then fail; this spends what was being thrown away. Narrowing the envelope itself is a one-constant change toREVIEW_PREFLIGHT_MAX_PROBES, independent of this PR.The silent case is not hypothetical: the postponed tail contains
google/gemma-4-31b-it, which answeredTimeoutErrorin 15 of the 19 probes that reached it, so replaying the burst's catalog puts two ~90 s probes in its second pass. Everything stays inside the probe budget ADR-0029 bounds (a count, never a clock),postponed_probed_countplus the provisioning step's duration make the trade visible per boot, andREVIEW_PREFLIGHT_MAX_PROBESis the lever if the census says the exchange is bad.Tests (
tests/test_contextual_orchestrator_review_runtime_preflight.py)test_preflight_postpones_a_rate_limited_account_and_spends_the_leftover_budget(rewrite of the skip test): every account 429 → first pass 6 probes, second pass 10,probed 16 / postponed_probed 10 / skipped 8 / ready 0, probe order = catalog order, stage still fails.test_preflight_burst_of_429s_does_not_end_the_walk_before_a_ready_route: the sixteenth probe reaches the first llama route →ready 1 / deferred 9 / rejected 6; it also asserts that two second-pass probes land on the silentgemma-4-31broutes, so the Cost table has a regression test. Its docstring states it does not claim the real burst would have been rescued.test_preflight_second_pass_does_not_spend_the_shared_escalation_budget: postponed candidates answering "budget too small" are rejected asescalation_reserved_for_first_passwithescalations_used == 0and one attempt each.test_preflight_records_only_a_usable_retry_after_delay(13 cases incl."²","¹²", Arabic-Indic"٣٠"→ 30, HTTP-date, negative, out-of-range, empty, absent, non-mapping) andtest_preflight_retry_after_survives_a_raising_header_mapping.test_preflight_walk_treats_a_none_candidate_as_a_candidate: the sentinel change, pinned.test_preflight_deferral_pairs_rows_with_probed_agents_after_skips: updated for the second pass (ready 4 / deferred 6 / skipped 0 / postponed_probed 3); the row/catalog misalignment it guards still starts at the fourth row._artifact_order_candidatesnow answersgemma-4-31bwithTimeoutError(its real answer in 15 of 19 probes) instead of an instant empty completion, so the dominant cost class is modelled.This PR was put through a three-lens adversarial refutation before push (loop control flow, evidence and design, test fidelity). It returned
refuted: trueon all three with 20 findings; every one was reproduced against the artifacts before acting. The blocker (isdigit/inton a provider header), the escalation-budget regression, the miscounted evidence table, the false "healthy-minute walk is unchanged" claim, the burst window and 310 ms spacing, the sibling run's real relationship to the burst, and the superseded ADR sentences all come from that pass.Not in this PR
A delayed second pass — that is what
retry_after_sis being collected to decide, and guessing a constant now is the mistake ADR-0003 exists to prevent. Also left alone: the fixture answersllama-3.2-90bOK while the artifacts showTimeoutErroron both keys in 17 of 17 probes; correcting it dropstest_preflight_reaches_both_keys_llama_routes_under_the_artifact_orderbelow itsready_count == 8assertion, which matches production, where no 2026-09-06 artifact reached eight ready routes (the best was six). That is a question about#1949's readiness target, raised on#1948. The shared per-key rate ledger (#1948) remains the lever above this layer.Developer experience
One list, one flag and one counter in the walk, one reserved-escalation branch, and a five-line header reader; the loop head changes from
for agent in agentsto an iterator that continues over the postponed list.User experience
A review whose sidecar meets a burst of rate limits on its first probes keeps looking instead of giving up with most of its probe budget unused, so fewer pull requests lose their review slot to a fraction of a second of refusals.
🤖 Generated with Claude Code