test(router): pin credits_used to the header the synced contract now declares - #182
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…declares `RouterRunResult.credits_used` landed guarded by a tripwire asserting the vendored Router contract did NOT declare `X-Comfy-Credits-Used`, with the instruction to reconcile once a spec sync declared it. That sync merged 35 seconds earlier, so the tripwire was already stale on arrival and the suite went red on the next run against main. Reconcile it as the tripwire prescribed: move `credits_used` into `_CONTRACT_HEADER_LIFTS`, where it is now checked from both ends -- the contract declares the name, and `_run_result` actually reads that name. The tripwire itself is retired, having reached the end of the lifecycle its own docstring described. Pinning it surfaced a second latent gap: the shared probe value `"x"` is not a finite decimal, so `_credits_used` normalises it to `None` and a perfectly correct lift looked like it was reading some other name. The probe is now per-field and each entry is a value the contract would really send. Replace the retired tripwire with a completeness check, so the next field cannot go unpinned the same way: every `RouterRunResult` field must be either listed with the header it is lifted from or named as deliberately not a lift. Verified by mutation: dropping `credits_used` from the list, and reverting either the `Idempotent-Replayed` or `X-Comfy-Credits-Used` lift to a wrong name, each fail a distinct test.
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📝 WalkthroughWalkthroughRouter contract tests now use field-specific header probes, including for ChangesRouter contract coverage
Priority: ⬇️ Low Estimated code review effort: 2 (Simple) | ~10 minutes Change: Other Suggested reviewers: Merge Risk: 🔵 Low · up to The SDK behavior remains covered, but this test can miss the header-classification regression it is meant to prevent. Use a valid probe independent of the lift table before merging. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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🔍 Cursor Review — Consolidated panel
Triggered by @mattmillerai.
Found 4 finding(s).
| Severity | Count |
|---|---|
| 🟡 Medium | 1 |
| ⚪ Nit | 3 |
Panel: 6/6 reviewers contributed findings.
…ting it Review follow-ups on the contract-pinning block, all test-only. _NON_HEADER_FIELDS exempts a field from BOTH pins, and nothing checked that a field listed there is genuinely not header-derived. That made it the convenient escape hatch for exactly the shape this PR exists to close: a field lifted from a header the vendored spec has not declared yet fails test_every_lifted_header_is_declared_by_the_contract if filed honestly, and passes silently if filed as an exemption. So the exemption is now tested -- hand _run_result every header that could move a field (the ones pinned here plus every other name the contract declares on the 200) and an exempt field must read the same as it does against no headers at all. Also: - The two categories are combined with a union, so a field named in BOTH satisfied the equality and a contradictory classification passed silently. Assert they are disjoint, as the docstring's "either ... or" already claimed. - Probe headers are now httpx.Headers rather than a plain dict, mirroring what production hands _run_result. A dict's .get is case-sensitive, so a spec sync that only re-cased a declared name would have failed these tests even though the SDK still reads it correctly -- pressure toward a no-op source edit. - Each probe is now the spec's own declared example, rendered as the wire string. dropped_params was a comma-free simplification of an example whose single entry contains a comma, which is the property its parser exists to preserve, and request_id was an invented id. X-Comfy-Router-Fallback-Provider is the one header declaring no example; the comment now says so rather than claiming more than it delivers. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
`test_every_lifted_header_is_declared_by_the_contract` was the only test in this block without a docstring, in a file where every sibling explains what it pins and why re-reading the source would not do. Records that this is the "Router actually sends this name" half of the pair, and that it is the half `credits_used` shipped without. Test-only; no assertion changes. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
…declares Ports #182 so this sync goes green: the vendored spec now declares X-Comfy-Credits-Used, so credits_used moves from the undeclared-lift tripwire into _CONTRACT_HEADER_LIFTS.
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Reviewed header contract reconciliation, distinguishing probe values, dataclass completeness and exemption guard. No blocking findings.
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Resolve the conflict in tests/test_router_spec_contract.py. main retired the stale tripwire with a standalone declared-name test for credits_used; this branch instead lists credits_used in _CONTRACT_HEADER_LIFTS, where the parametrized declared-name and reads-the-name tests both cover it with a probe that _credits_used accepts. Keep the branch's side, which pins the same declared-name assertion and also the read side.
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Review comments at @tests/test_router_spec_contract.py:
- Line 560: Update the probe construction in the test that compares
`_run_result` with and without headers so result-bearing headers always receive
parser-valid values independently of `_CONTRACT_HEADER_LIFTS`. In particular,
provide a decimal value for `X-Comfy-Credits-Used`; keep the fallback for other
declared headers so misclassifying a field cannot make the exemption assertion
pass when both results are `None`.
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…ation The exemption test built its probes from _CONTRACT_HEADER_LIFTS, so misfiling a lift (e.g. credits_used) into _NON_HEADER_FIELDS also dropped its valid probe. The header was then sent as the generic fallback its parser rejects, the field read None both ways, and the misfiling passed the test meant to catch it. Move the probes into a header-keyed _HEADER_PROBES table that both pins and the exemption test read from.
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ELI-5
The SDK reads a few facts about a model run out of the HTTP response headers Comfy Router sends back — which provider actually served it, whether it was an idempotency replay, and what it cost. A test file pins each of those header names against the vendored copy of Router's own contract, so a typo can't silently make a field read as "absent" forever.
credits_usedwas the one field that wasn't pinned. When it was added, the vendored contract didn't declareX-Comfy-Credits-Usedyet, so it shipped behind a deliberate tripwire test that asserted the header was still undeclared — a reminder that would go red the moment a spec sync declared it, with instructions to reconcile. The sync that declared it merged 35 seconds before the lift did. So the tripwire was stale on arrival, andmainwent red. #145 has since replaced the tripwire onmainwith a standalone declared-name test forcredits_used, which turnedmaingreen again. This PR does the full reconciliation the tripwire asked for: it pinscredits_usedlike every other lift.What changed
Test-only. No production code is touched.
credits_usedmoves into_CONTRACT_HEADER_LIFTS, so it is now checked from both ends like every other lift: the vendored contract declares the name, and_run_resultdemonstrably reads that name._CONTRACT_HEADER_LIFTSand get it pinned like the rest"), and with the header now declared it asserted a falsehood. On currentmain, fix: return a model run's native bytes instead of raising on a non-JSON 200 #145 had already replaced it with a standalonetest_credits_used_header_is_declared_by_the_contract. That test exists only because the old shared"x"probe could not exercisecredits_used. Mergingmainin, this branch keeps its parametrized pins instead:test_every_lifted_header_is_declared_by_the_contract[credits_used-X-Comfy-Credits-Used]makes the same declared-name assertion, and the per-field probe adds the read side.credits_usedimmediately surfaced a second latent gap:test_the_lift_actually_reads_the_declared_nameset every header to the literal"x", but"x"is not a finite decimal, so_credits_usednormalises it toNone— a completely correct lift looked like it was reading some other name. Each header's probe is now the spec's own declaredexample, rendered as the wire string (X-Comfy-Router-Fallback-Provideris the one header declaring no example). The probes sit in their own header-keyed_HEADER_PROBEStable, which_CONTRACT_HEADER_LIFTSand the exemption test both read (see the second review round)._CONTRACT_HEADER_LIFTS, which means a field that simply isn't listed is checked by nothing at all — which is precisely howcredits_usedslipped through.test_every_header_derived_field_is_pinned_against_the_contractcloses the list from the other end: everyRouterRunResultfield must be either listed with the header it is lifted from, or named in_NON_HEADER_FIELDSas deliberately not a lift.Review round
Still test-only. Four findings from the automated review panel, all on the pinning block above:
_NON_HEADER_FIELDSwas an unverified escape hatch (the one Medium). Listing a field there exempts it from both pins, and nothing checked the exemption was honest — which made it the convenient way to land exactly the shape this PR exists to close, since a field lifted from a header the spec has not declared yet failstest_every_lifted_header_is_declared_by_the_contractif it is filed truthfully.test_an_exempt_field_is_really_unmoved_by_the_headers_it_skipsnow tests the claim: hand_run_resultevery header that could move a field — the ones pinned here, plus every other name the contract declares on the200— and an exempt field must read the same as it does against no headers at all.httpx.Headers, not a plain dict — which is what production hands_run_result. A dict's.getis case-sensitive;httpx.Headersis not. A spec sync that only re-cased a declared name would have failed these tests even though the SDK still reads it correctly, and the only way back to green would have been a no-op edit to the source spelling.dropped_params' probe was a comma-free simplification of an example whose single entry contains a comma — precisely the property its parser exists to preserve. Probes are now copied from the spec verbatim (request_id's was an invented id too), so the comment's claim that each is "a value the contract itself would send" is literal rather than aspirational.test_every_lifted_header_is_declared_by_the_contract), which is also what clears CodeRabbit's docstring-coverage check on the touched functions. It records that this is the "Router actually sends this name" half of the pair — the halfcredits_usedshipped without. No assertion changed.Each of the first two was mutation-checked the same way as the table below: misfiling
request_idinto_NON_HEADER_FIELDSfails the new exemption test, naming it in both collections fails the new disjointness assert, and re-casing a declared header tox-comfy-request-idnow stays green where it previously went red.Review round 2
_CONTRACT_HEADER_LIFTS. Misfilingcredits_usedinto_NON_HEADER_FIELDStherefore also dropped its decimal probe, so the header got the generic"probe"fallback._credits_usedrejects that value, so the field readNoneboth with and without the header, and the misfiling passed. The probes now live in a header-keyed_HEADER_PROBEStable, separate from the lift classification. Mutation-checked: movingcredits_usedinto_NON_HEADER_FIELDSnow failstest_an_exempt_field_is_really_unmoved_by_the_headers_it_skips.Why the contract now declares it
spec/router-openapi.yamldefinesX-Comfy-Credits-UsedasRouterCreditsUsedHeader,type: string,required: false. That matches what the field already documents and what it already does — it is carried as the wire string and never coerced to a number — so no production change follows from the sync.Verification
Mutation-tested, because a test that only passes proves very little here. Each of these fails a distinct test, and each was confirmed by actually making the edit and running the suite:
credits_usedfrom_CONTRACT_HEADER_LIFTStest_every_header_derived_field_is_pinned_against_the_contractX-Comfy-Idempotent-Replayedtest_the_lift_actually_reads_the_declared_name[replayed-...]X-Comfy-Creditstest_the_lift_actually_reads_the_declared_name[credits_used-...]The second row is the regression that made
replayedpermanentlyFalseagainst a real deployment. It was already covered by unit tests; it is now also pinned against the contract itself, which is the check that would have caught it without anyone thinking to write a test for that specific name.Residual
Not fixed by this PR, and worth a human's attention:
main.credits_usedbeing surfaced fromX-Comfy-Credits-Used, andreplayedbeing read fromIdempotent-Replayedrather than theX-Comfy--prefixed spelling, both landed in feat(models): surface X-Comfy-Credits-Used on RouterRunResult #166 (merged 2026-09-20), along with tests covering the"0"-vs-Nonedistinction, the absent-header case, the replay regression, and both the sync and asyncrun_detailedpaths. Nothing in that set needed redoing; this PR only closes the contract-pinning gap that feat(models): surface X-Comfy-Credits-Used on RouterRunResult #166's own tripwire flagged and that the spec sync then tripped.mainwas red from 2026-09-20 until fix: return a model run's native bytes instead of raising on a non-JSON 200 #145 replaced the stale tripwire. chore: sync vendored Comfy Router spec (cloud@427cc43) #177 (spec sync) and feat(models): surface X-Comfy-Credits-Used on RouterRunResult #166 merged 35 seconds apart, and neither PR's CI run could see the other's change — a semantic conflict that branch-level CI structurally cannot catch. Worth considering whether the merge queue or a required up-to-date-with-base check should cover this class; that is a repo-infrastructure decision, not something to settle in this PR.v0.4.0, which predates feat(models): surface X-Comfy-Credits-Used on RouterRunResult #166; both thecredits_usedaddition and thereplayedfix sit under## [Unreleased]in the changelog. Anyone installingcomfy-sdkfrom PyPI today still gets aRouterRunResultwith nocredits_usedand a permanently-Falsereplayed. Cutting a release is a human call and is out of scope here.X-Committed-Spend-*trio is still not surfaced. The contract declaresX-Committed-Spend-Current,-Limitand-Remainingon the same200; the SDK lifts none of them. That is a different quantity fromcredits_used(in-flight commitment, not the price of this run) and is deliberately out of scope. Note the new completeness guard does not force the issue — it only checks that fields which exist are pinned, so it will stay green while these remain unsurfaced.Idempotent-Replayed: true, the header "restates what the original run cost". The SDK's docstring never encoded the stricter claim, so there is nothing to correct in code — but if any sibling SDK or doc page encoded it, it needs revisiting. I did not audit for that.Unexercised artifacts
model_provider=fal|wavespeed|higgsfield|runware) were not exercised against production: a real run is a billable, state-changing call, and I hold no credentials for it. Everything here is verified against the vendored contract and the repo's fake-server fixtures. The end-to-end claim that production stamps these headers as the contract says rests on the contract and on the operator's own prod run, not on anything I ran.Provenance
pytest: 1016 passed, 9 skipped (onmainbefore this change: 1 failed, 1012 passed);ruff check .: passed;ruff format --check .: 57 files already formatted;mypy src: no issues in 21 source files;scripts/check_drift.py: models in sync, all 18 router error types covered, bound path correct;scripts/check_public_repo_hygiene.py: no internal-only references. Mutation checks per the table above and per## Review round, each run individually and reverted. Re-verified atbbe527a(the docstring commit adds no test, so the counts are unchanged;ruff check,ruff format --check,mypy srcandtests/test_router_spec_contract.py(75 passed) re-run after it). Confirmed against the base:mainis still red ontest_an_undeclared_lift_stays_undeclared_until_someone_reconciles_it[credits_used-X-Comfy-Credits-Used], the stale tripwire this PR retires. Re-verified after mergingmain(at9d0d6aa, which brings in fix: return a model run's native bytes instead of raising on a non-JSON 200 #145 and feat(models): add models.list() and models.schema() for Router model discovery #202) at78e6290:pytest1138 passed, 9 skipped;ruff check .passed;ruff format --check .60 files already formatted;mypy srcno issues in 22 source files;scripts/check_drift.pyandscripts/check_public_repo_hygiene.pyOK. Re-verified at1c8fd7d(review round 2):pytest1138 passed, 9 skipped;ruff check .passed;ruff format --check .60 files already formatted;mypy srcno issues in 22 source files;scripts/check_public_repo_hygiene.pyOK; the round-2 mutation check run and reverted. Local runs only — the authoritative result is this PR's own CI.mainby feat(models): surface X-Comfy-Credits-Used on RouterRunResult #166 before this branch was cut — see## Residual. Both review rounds added test coverage only; no production code is touched by any commit on this branch. The merge withmainresolved a conflict intests/test_router_spec_contract.pyby keeping this branch's side, which supersedes fix: return a model run's native bytes instead of raising on a non-JSON 200 #145's standalonecredits_useddeclared-name test.Summary by CodeRabbit