[krisztian-gajdar]

Summary

examples/coding-agent-opencode/conformance.py recorded a capacity refusal as a behaviour failure. On a rate-capped endpoint, tool_choice_required failed with RESOURCE_EXHAUSTED: the upstream is busy, please retry. The refusal came as an error event in the stream, and the check did not retry it. The same request sent alone passed.

What changes

• What is retried. A request refused as busy or rate-limited:
  • a 429 or 503 whose code is QUEUE_FULL, RESOURCE_EXHAUSTED or rate_limit_exceeded;
  • or an error event with one of those codes that ends a stream before any output.
• How long it waits.
  • Each wait is the Retry-After header, else the error's retry_after_s, capped at 60 s. Retry-After may be delay-seconds or a future HTTP date. A past, unparseable, negative or non-finite value counts as absent.
  • Without either, the wait is 5 s, doubling with each retry.
  • A request is retried at most 4 times and waits at most 180 s in all.
• What the report records.
  • Each retry is recorded with its error and wait in the case's observed.
  • Each case has a retries count, and the table shows it.
• When it gives up.
  • A case still refused as busy after the cap has the new status capacity, not fail. So does a case whose stream ends in a busy error event after some output; that one is not retried.
  • The summary counts capacity apart, and it makes the exit code 1.
  • Cases that depend on a busy request are capacity too: tool_result_round_trip, finish_reason_tool_calls and usage_on_final_chunk.
  • In include_reasoning, a refusal or other non-busy failure is reported before a busy result, so a conclusive failure is not hidden as capacity.
• What is not retried. Every other error. This is narrower than before: the old check retried any 429, and any 503 except MODEL_LOADING. Now a 429 insufficient_quota or a 503 transport_failure fails at once.
• Warm-up. The gateway answers 503 provisioning while it starts a worker. The old blanket 503 retry covered that. The warm-up now waits out provisioning as it does MODEL_LOADING, so a cold gateway is still waited for.
• README. The paragraph on busy handling is rewritten. The note under the recorded relay run no longer says the check "does not retry"; it says the refusal was a stream error event, which the check at that commit did not retry.

Tests

All in tests/test_conformance.py, against the existing scripted stub:

• The existing busy case (503 QUEUE_FULL twice) now asserts that the case passes, has retries == 2 and a wait of 0 from Retry-After: 0.

• The old 429 case, which expected fail, is replaced by a parametrized exhaustion case. It covers:

  • a 429 without Retry-After (waits 5/10/20/40);
  • a past HTTP-date Retry-After, a nan one and a -3 one, all ignored;
  • Retry-After: 60 and 600, both capped at 60, so the 180 s cap stops it after 3 retries;
  • a busy error event with retry_after_s: 12.

  Each must end as capacity with the matching waits and retry count.

• Retry success: a 429 with Retry-After: 7 twice, one with a Retry-After date 30 s ahead, and one busy error event before output. All end recorded / supported.

• A refused include_reasoning with a busy plain request is fail. A busy plain request alone is capacity.

• Not retried:

  • 429 insufficient_quota, 503 transport_failure, 500 RESOURCE_EXHAUSTED and an inference_error event all fail with 0 retries and no sleep;
  • a busy event after output is capacity with 0 retries.

• An endpoint that is always busy gives 10 capacity, 1 recorded and 0 fail. main() returns 1 and prints 10 capacity.

• The mid-stream error test now uses a non-busy inference_error. A busy event before output is now retried.

• The warm-up test is parametrized over MODEL_LOADING and provisioning.

Sleeps are monkeypatched, so the suite does not wait.

Mutation check

19 mutants of conformance.py, each caught by at least one test:

Mutant	Caught by
error events not treated as busy	test_a_busy_error_event_before_any_output_is_retried
any 429/503 code retried	test_model_loading_is_waited_out[provisioning] (and the not-retried cases)
Retry-After ignored	test_busy_refusals_are_retried_and_recorded
body retry_after_s ignored	test_a_busy_error_event_before_any_output_is_retried
no 180 s total cap	test_a_request_still_busy_after_the_cap_is_a_capacity_failure[60]
no attempt cap	test_a_request_still_busy_after_the_cap_is_a_capacity_failure[no hint]
retry after output	test_a_busy_error_event_after_output_is_not_retried
no backoff doubling	test_a_request_still_busy_after_the_cap_is_a_capacity_failure[no hint]
no 60 s per-wait cap	test_a_request_still_busy_after_the_cap_is_a_capacity_failure[600]
busy reported as fail in _fail_on_error	test_an_endpoint_that_stays_busy_fails_on_capacity_not_behaviour
exit code ignores capacity	test_an_endpoint_that_stays_busy_fails_on_capacity_not_behaviour
warm-up without provisioning	test_model_loading_is_waited_out[provisioning]
retries not counted	test_busy_refusals_are_retried_and_recorded
tool_choice_required busy as fail	test_a_request_still_busy_after_the_cap_is_a_capacity_failure
round trip busy as fail	test_an_endpoint_that_stays_busy_fails_on_capacity_not_behaviour
include_reasoning busy as fail	test_an_endpoint_that_stays_busy_fails_on_capacity_not_behaviour
Retry-After dates ignored	test_a_retry_after_date_is_waited_until
past Retry-After dates used as negative waits	test_a_request_still_busy_after_the_cap_is_a_capacity_failure[past date]
busy result reported before a refusal	test_a_busy_request_does_not_hide_a_refusal

Validation

• CI=1 uv run --frozen pytest -q in examples/coding-agent-opencode: 60 passed.
• ruff check and ruff format --check on the two changed Python files: clean.
• mise run lint and mise run typecheck: pass.
• tools/ci/check_public_tree.py: pass.

No request was sent to a live endpoint.

Overlap

#735 edits other parts of this example: other README sections, run_gate.sh, tests/test_run_gate.py, tests/test_openrouter_recipe.py and recipes/openrouter. This PR touches only conformance.py, tests/test_conformance.py and two README passages: the busy-handling paragraph and the note under the recorded relay run. Those passages are outside #735's hunks. Whichever PR merges second merges main.

Summary by CodeRabbit

• New Features
  • Conformance checks wait for model-loading or gateway-provisioning states to clear, then retry eligible busy and rate-limited requests with bounded delays.
  • Retry counts and capacity outcomes are included in reports and summaries. Persistent busy responses, including those that prevent dependent checks from being judged, are classified as capacity outcomes and result in a nonzero exit status.
  • Other errors are not retried, and busy stream errors after output are recorded as capacity outcomes.
• Documentation
  • Updated the guide with warm-up conditions, retry limits and delays, and error handling.

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📝 Walkthrough

The conformance check now retries selected busy responses within configured limits. It records retry details, classifies persistent busy outcomes as capacity, and includes retry and capacity counts in reports and command results.

Changes: Conformance capacity handling

Layer / File(s)	Summary
Retry policy and request execution examples/coding-agent-opencode/conformance.py, examples/coding-agent-opencode/tests/test_conformance.py	The shared request wrapper parses retry hints, applies bounded waits, and records retry details and elapsed time. Tests cover retry schedules, capacity limits, and errors that are not retried.
Capacity outcomes and reporting examples/coding-agent-opencode/conformance.py, examples/coding-agent-opencode/tests/test_conformance.py, examples/coding-agent-opencode/README.md	Busy outcomes propagate as capacity through dependent checks. Warm-up recognizes provisioning. Reports include retry and capacity counts, and the command exits nonzero for capacity outcomes. The README describes these behaviors and updates its Cloud result commentary.

Sequence Diagram(s)

sequenceDiagram
  participant Check as Conformance check
  participant Endpoint as Model endpoint
  participant Report as CLI report
  Check->>Endpoint: Send request
  Endpoint-->>Check: Return busy response or error event
  Check->>Endpoint: Retry eligible request within configured limits
  Check->>Report: Include retry and capacity counts

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Suggested reviewers: dragosboca

Priority: ⬇️ Low

Merge Risk: ⚪ Minimal · up to bc388

The retry behavior matches the documented wait limit and delay precedence. No identified issue needs resolution before merging.

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Title check		The title clearly and concisely describes the main change: the agent-loop conformance check now waits and retries when the endpoint is busy.

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Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 47 functions across 2 files. (1 skipped: 1 unsupported.)

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Actionable comments posted: 1

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examples/coding-agent-opencode/conformance.py-631-633: 1

631-633: 🎯 Functional Correctness | 🟡 Minor | ⚡ Quick win

⚠️ Unverified finding
Verification ran but could not confirm this finding. It is shown for review, not as a verified issue.

Do not let a busy result conceal a conclusive error.

If with_flag returns a non-busy refusal and without_flag remains busy, this branch reports capacity before Lines 634-643 examine the refusal. The report then hides a known failure of include_reasoning. Check non-busy errors first, and use capacity when the busy result actually prevents a verdict.

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Inline comments:
Review comments at @examples/coding-agent-opencode/conformance.py:
- Line 208: Update the Retry-After parsing at the retry_after assignment to
handle both delay-seconds and valid future HTTP-date values, using the date’s
remaining time as the requested delay. Fall back to the existing exponential
backoff when the header is absent or invalid, and preserve the existing cap on
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[krisztian-gajdar]

The additional (unverified) finding on include_reasoning is also fixed in bc3884b. A non-streamed failure or a non-busy refusal is now reported before a busy result, so capacity is used only when a busy request is what prevents a verdict. test_a_busy_request_does_not_hide_a_refusal covers both orders: a refused flag with a busy plain request gives fail, and a busy plain request alone gives capacity. The reorder mutant is caught.