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WalkthroughThe standalone non-streaming route now sets backend, attempted-fallback, and exact settled-cost response headers. Unit tests cover populated headers, omitted cost, and fallback attribution. ChangesStandalone response metadata
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Inline comments:
In `@src/gateway/api/routes/_pipeline.py`:
- Around line 4795-4796: Update the response-cost header assignment in the
standalone success path to serialize the settled Decimal directly, removing the
as_float conversion while preserving the existing None check and exact decimal
precision.
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src/gateway/api/routes/_pipeline.py (1)
4902-4903: 📐 Maintainability & Code Quality | 🔵 TrivialRun the required full lint gate before merge. The repository requires
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This has been sitting a week with CI green and no review yet. Anything blocking it, or should I look at splitting it differently? |
run_standalone_non_stream already resolves the serving provider, the settled cost, and (when a routing policy fired) how many earlier candidates it fell over before this one, but none of it reached the caller: only X-Otari-Request-ID and X-Correlation-ID exist today. Add x-otari-backend, x-otari-response-cost, and x-otari-attempted-fallbacks to the standalone non-streaming response, right where rate-limit headers are already set. Backend and fallback-count are always known (0 fallbacks when no policy routed the request); the cost header is set only when log_usage actually settled one. Scoped to standalone-mode, non-streaming: hybrid/platform-mode headers, the streaming path, and attempted-retries (no retry counter exists anywhere in the codebase yet) are left for follow-up PRs. Refs mozilla-ai#401
str(as_float(actual_cost)) narrows through a float before serializing to the header, which can round large valid costs. Serialize the settled Decimal directly.
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AGENTS.md requires Otari-defined headers to skip the X- prefix per RFC 6648; these are our own new headers with nothing external depending on the old names yet, so renaming is the whole fix.
…uting-cost-headers # Conflicts: # tests/unit/test_pipeline_settlement.py
# Conflicts: # tests/unit/test_pipeline_settlement.py
…t, and replay them Name the three headers Otari-Backend, Otari-Attempted-Fallbacks and Otari-Response-Cost, as constants beside Otari-Request-ID. The cost header now carries the same six-decimal string as usage.cost_usd under the same rule, so an unpriced estimate no longer shows up as a cost. An alias hides its target, so Otari-Backend is withheld behind one; a routing policy does not hide its candidates and still names the backend. An idempotent replay repeats all three, since they describe the request. Documented in docs/api-reference.md. Refs mozilla-ai#401
🦕 Reviewsaur QuizA review comprehension quiz has been generated for this PR. Attempt 1 | (0/1 approval) | This link is for this PR's reviewers and expires when the PR is closed. Tip: To require this quiz before merging, enable it as a required status check. PR Walkthrough — what this change does, how it works, and what it influencesComplexity: normal — Diff touches five source files across config, pipeline, idempotency, docs and tests, adding conditional header logic and new test paths. What this change doesThe change adds three response headers (Otari-Backend, Otari-Attempted-Fallbacks, Otari-Response-Cost) to non-streaming responses produced by run_standalone_non_stream in standalone mode. Constants for the headers are defined in config.py and added to the _REPLAYED_HEADERS tuple. In _pipeline.py the headers are populated after the provider call using provider identity, attribution.position, and standalone_settlement cost_usd when conditions are met. Documentation is extended in api-reference.md, idempotency replay tests and settlement unit tests are updated to cover the new headers. How it works
Where it sitsEntry points: run_standalone_non_stream called from chat/completions, messages and responses routes What this influences
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Thanks for this, @AmirF194, and sorry it sat so long without a review. The scoping was careful, and the tests read well. We're closing it along with #401. Since you opened it, the gateway has started returning cost in the response body ( |
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Description
run_standalone_non_streamalready resolves the serving provider, the settled cost, and (when a routing policy fired) how many earlier candidates it fell over before this one, but none of it reaches the caller today: onlyOtari-Request-IDexists. This addsOtari-Backend,Otari-Response-Cost, andOtari-Attempted-Fallbacksto the standalone-mode non-streaming response, right next to the rate-limit headers that are already set there.Otari-Attempted-Fallbacksis always present (0 when no policy routed the request, since that's a true, known answer, not an unknown one).Otari-Backendis present unless the caller named an alias, which hides its target (a policy does not hide its candidates).Otari-Response-Costcarries the same string asusage.cost_usd, under the same rule, so an unpriced request carries none. An idempotent replay repeats all three. Documented indocs/api-reference.md.Scoped down from the full issue on purpose: hybrid/platform-mode headers and the streaming path are a different code path with different settlement timing, and the attempted-retries header has no data behind it yet (
_platform.py's 5xx retry predicate doesn't record anything queryable, per your own comment on this issue). All three are left for follow-up PRs rather than guessed at here.How to test it locally
Three new tests in
test_pipeline_settlement.py, next to the existingtest_standalone_non_stream_applies_rate_limit_headers: the three headers on a normal call, the cost header absent when nothing settled, and the fallback count read fromRoutingAttribution.position.PR Type
Relevant issues
Refs #401
Checklist
tests/unit,tests/integration).make lint,make typecheck,make test).uv run python scripts/generate_openapi.py).AI Usage
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Summary
Standalone non-streaming responses now include backend, attempted-fallback, and settled-cost information in response headers. Cost values preserve exact
Decimalprecision.Unit tests cover backend identity, unsettled costs, and fallback counts.