fix(chat): apply the Fast capability gate to the native passthrough - #2151
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No actionable comments were generated in the recent review. 🎉 ℹ️ Recent review info⚙️ Run configurationConfiguration used: Path: .coderabbit.yaml Review profile: ASSERTIVE Plan: Pro Plus Run ID: 📒 Files selected for processing (2)
Included review availability: Your plan provides up to 10 included reviews per hour; 9 remain after this review. 📝 WalkthroughWalkthroughChangesThe Chat adapter now applies resolved Fast-tier policy to passthrough and regular requests. Native Chat requests and provider-key failover retries pass the same policy and Fast-mode state. Tests cover capability gates, tier forwarding, forced modes, failover, and path parity. Chat service-tier policy
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: ⚪ Minimal · up to The change makes native chat passthrough honor provider and model Fast-capability declarations, preventing unsupported service-tier fields from being forwarded upstream. No actionable merge-blocking risk remains beyond normal checks and review. Sequence Diagram(s)sequenceDiagram
participant ChatNativeHandler
participant FastPolicyResolver
participant OpenAIChatAdapter
participant ProviderKeyFailover
ChatNativeHandler->>FastPolicyResolver: Resolve provider/model Fast policy
ChatNativeHandler->>OpenAIChatAdapter: Build request with policy and Fast mode
OpenAIChatAdapter-->>ChatNativeHandler: Forward or remove service_tier
ChatNativeHandler->>ProviderKeyFailover: Retry after key failure
ProviderKeyFailover->>OpenAIChatAdapter: Rebuild with the resolved policy
OpenAIChatAdapter-->>ProviderKeyFailover: Apply the same service-tier decision
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Inline comments:
In `@src/adapters/openai-chat.ts`:
- Around line 1313-1321: Update the tier fallback around tierDecision and the
service-tier serialization path to honor foreignCallerTiers consistently with
decideTier: when tierDecision is absent, resolve the caller tier through
decideTier using fastPolicyForModel, an undefined explicit decision, and
callerTier, rather than relying only on supportsServiceTierForModel and
canonicalFastTierMarker. Add a direct createOpenAIChatAdapter(...).buildRequest
regression test covering a foreign tier with foreignCallerTiers set to drop and
no tierDecision, verifying it is not serialized.
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src/adapters/openai-chat.tssrc/server/chat-native.tstests/fastwire-characterization-wire.test.tstests/openai-chat-native-policy.test.tstests/openrouter-provider-routing.test.ts
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리뷰 · 우선순위 60 / 80지금
Closes #1886은 과함. FastWire 우산임. 이건 네이티브 챗 패스스루 한 면만. #2147도 같은 우산을 닫으려 했음. 둘 다 Refs만. #2075는 이미 닫힘. types.ts/config.ts 안 건드림. 분할에 깔림 없음. 닫으라는 쪽 아님. 점수는 60임. 구멍은 맞음. 2.27 필수 아님. Fast A1은 이미 해결방안: 머지. #1886 Closes 빼고 Refs로. 특성화 테스트 "native chat passthrough honors exact-model false" 유지. Fast 일반화(#1875 B2)는 별 PR. 이 댓글은 grok-bot이 작성했습니다 |
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I cannot approve the current head because it is 16 commits behind the current dev tip (caf20353f). The existing diff and CI results therefore predate a material set of integration changes.
Please rebase this focused change onto the latest dev, resolve any conflicts without carrying unrelated commits, rerun the focused checks plus the full exact-head suite, and re-request review. This is a review-state blocker, not a rejection of the fix direction.
Native /v1/chat/completions decided service_tier from chatServiceTier alone, so a provider declaring supportsServiceTier: false - or an exact-model false - still had the field forwarded. That is fail-open onto upstreams that reject it or bill differently for it. Route the native passthrough through the same resolved Fast policy the rest of the chat path uses, so a fail-closed or per-model declaration is honored on every surface rather than only the translated ones. Carries @olddonkey's #2075, rebased onto current dev. The only manual resolution was an import list in openai-chat.ts where dev had since added AdapterTierMetadata alongside this PR's decideTier and ResolvedFastPolicy; both sides are kept. Closes #1886
canSerializeOpenAIChatServiceTier re-derived its own answer when the router supplied no tierDecision, returning true whenever foreign caller tiers could be forwarded at all. decideTier consults the resolved policy for the specific tier, so the two disagreed: a provider whose fastWire sets foreignCallerTiers: "drop" would still serialize a caller's flex. The fallback now calls decideTier and serializes only set/forward-caller, which makes the state machine the single authority on both paths. Found by CodeRabbit on #2151.
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Summary
Native
/v1/chat/completionsdecidedservice_tierfromchatServiceTieralone, so a provider declaringsupportsServiceTier: false— or an exact-modelfalse— still had the field forwarded. That is fail-open onto upstreams that reject the field or bill differently for it (#1886).Credit: @olddonkey's #2075, rebased onto current
dev.The native passthrough now runs through the same resolved Fast policy the rest of the chat path uses, so a fail-closed or per-model declaration is honored on every surface rather than only the translated ones.
Why this is here after being triaged below the line
Like #2150, I scored this below my absorb threshold from metadata — it showed
CONFLICTING, and I treated that as the reason not to look further. A re-scoring pass reading the diff put it at 67. The conflict was why it could not merge, not why it scored low, and those are different questions. Rebasing turned out to be one import line.The rebase, stated exactly
The only manual resolution was an import list in
src/adapters/openai-chat.ts:devhad since addedAdapterTierMetadatawhile this PR addsdecideTierandResolvedFastPolicy. Both sides are kept — no logic was dropped or reinterpreted. Everything else applied cleanly.Verification
src/fails the characterization test "native chat passthrough honors exact-model false" — which the author had flipped from a documented known-bug into a passing assertion, so it is the exact contract at stake.bun test --isolate tests— 13,552 pass, 0 fail, 10 skip (856 files).bun test --isolateonfastwire-characterization-wire,openrouter-provider-routing,fastwire-policy— 295 pass, 0 fail.bun run typecheck— clean (this is what confirms the import resolution).bun run privacy:scan— passed.Supersedes
Closes #2075 (@olddonkey) once merged, with attribution.
Checklist
Closes #1886
Summary by CodeRabbit
Bug Fixes
Tests