refactor(fastwire): A1 — FastWire policy resolution, byte-identical behavior (#1886) - #1893
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refactor(fastwire): A1 — FastWire policy resolution, byte-identical behavior (#1886)#1893olddonkey wants to merge 4 commits into
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…ctor Phase A0 of the FastWire umbrella (lidge-jun#1886): characterization suites only, zero production changes. Locks the three-state fastMode contract, the unclassified passthrough matrix, exact-model foreign-tier forwarding, the mixed requestedServiceTier logging semantics, routing/fingerprint projections, catalog tier-field byte goldens, and two known bugs (native chat ignores exact-model false; chat-to-responses conversion drops service_tier) as current behavior. Full suite at this commit: 12746 pass / 10 skip / 0 fail. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Included review availability: Your plan includes up to 10 reviews per rolling hour; 6 remain after this review. 📝 WalkthroughWalkthroughChangesFastWire policy integration
Estimated code review effort: 4 (Complex) | ~60 minutes Merge Risk: ⚪ Minimal · up to The refactor preserves existing wire and catalog behavior while centralizing FastWire policy resolution; configuration handling, foreign-tier filtering, warning redaction, and caching concerns are addressed or non-actionable, so no merge-blocking risk remains after normal checks. Possibly related PRs
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Actionable comments posted: 11
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Inline comments:
In `@src/config.ts`:
- Around line 784-794: Apply the provider-level false precedence in both
src/config.ts:784-794 and src/config.ts:1456-1476: have the fastWire superRefine
return before scanning exact capabilities when supportsServiceTier is false, and
only derive inheritedCapability when effectiveProviderCapability is not false.
Use the existing symbols so registry or configured exact-model true values
cannot override the explicit provider denial.
- Around line 719-744: Update fastWireSchema and its nested schemas to retain
only Zod shape/coercion checks such as types and trimming, then add one
superRefine that delegates semantic validation to fastWireDeclarationError. Map
each returned declaration error into the Zod refinement context, covering
priority, wire-value length and uniqueness, beta limits/uniqueness, and the
existing kind and foreignCallerTiers constraints without duplicating those rules
locally.
- Around line 1456-1476: Adjust loadConfig() to use load-specific validation or
normalization that treats the registry-dependent fastWire=null conflict as
absent and emits a warning, avoiding fallback to getDefaultConfig() and
preserving persisted providers and apiKeys. Keep the strict rejection in
validateConfigCandidate() unchanged.
In `@src/providers/fastwire.ts`:
- Around line 153-178: Update decideTier to accept the caller tier or its
canonicalFastTier classification and apply policy.foreignCallerTiers before
every forward-caller result. When the caller tier is foreign and the policy is
"drop", return { kind: "drop" }; preserve forwarding for canonical or permitted
foreign tiers. Update all callers, including the Responses adapter path, and add
regression coverage for canonical and foreign caller values.
In `@src/providers/service-tier.ts`:
- Around line 114-134: Update authorityForProvider to cache authorities by
frozen provider objects, including resolved route providers, so repeated calls
reuse the same buildFastPolicyAuthority result instead of rescanning the
registry and recreating maps. Add an appropriate WeakMap lookup/store for frozen
providers while preserving the existing no-provider-name short circuit and
captured authority behavior.
- Around line 38-49: Update resolvePolicyAdapter to normalize keys for hardPins,
modelAdapters, and registry defaults consistently using trimmed,
case-insensitive lookup. Ensure explicit modelAdapters overrides and hardPins
match identifiers such as Model-A and MINIMAX-M2.5 while preserving their
existing precedence.
In `@src/server/responses/core.ts`:
- Around line 1163-1165: Extract the eligibility-to-support mapping into an
exported serviceTierSupportFromPolicy helper in service-tier.ts, update
serviceTierSupportForModel to delegate to it, and replace the inline
modelServiceTierSupport ternary with a call using the resolved fastPolicy.
Preserve the existing true, undefined, and false behavior while centralizing
future eligibility-state handling.
- Around line 1172-1176: Update the fast-policy warning near the capability
check to pass route.providerName through the existing redactSecretString helper
before interpolation, and throttle console.warn so each provider/model pair
emits at most one warning across requests. Use a module-level or otherwise
shared provider/model tracking mechanism, keyed by both route.providerName and
route.modelId, while preserving the existing warning condition and message
context.
- Around line 1166-1169: Remove the unused canonicalFastTier state from the
parsing flow: delete the canonicalFastTierMarker import and helper, remove the
canonicalFastTier calculation and assignment/deletion around parsed.options in
the response handling code, and delete tests that cover this helper or field.
Preserve serviceTier parsing and all unrelated response behavior.
In `@tests/fastwire-characterization-wire.test.ts`:
- Around line 241-273: Fix both characterized bugs: update
buildOpenAIChatPassthroughRequest to gate service_tier serialization with
canSerializeServiceTierForChatModel, then change its expectation so unsupported
models omit the field; update chatCompletionsToResponsesBody to preserve the
incoming service_tier and revise the conversion test to expect it.
In `@tests/fastwire-policy.test.ts`:
- Around line 396-421: Add a “forward-caller” case to the existing immutability
test table, using the caller’s tier as the expected outbound value. Verify that
the tier is preserved in the serialized outbound body while parsed._rawBody
remains the original unchanged object, covering the forward-caller branch of
applyTierDecisionToResponsesBody.
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📒 Files selected for processing (14)
src/adapters/openai-responses.tssrc/codex/catalog/provider-fetch.tssrc/config.tssrc/providers/derive.tssrc/providers/fastwire.tssrc/providers/registry.tssrc/providers/service-tier.tssrc/router.tssrc/routing/compatibility/behavior.tssrc/server/responses/core.tssrc/types.tstests/fastwire-characterization-routing.test.tstests/fastwire-characterization-wire.test.tstests/fastwire-policy.test.ts
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…ical behavior Phase A1 of the FastWire umbrella (lidge-jun#1886): FastWire descriptors, FastPolicyAuthority capture with a precomputed modelWireOverrideAllowed guard, the shared resolveFastPolicy() four-level adapter resolver with capability/eligibility separation, and the TierDecision state machine. Fast-mode injection no longer mutates parsed._rawBody; the Responses adapter applies the settled decision to a detached outbound body. The legacy Chat serializer gate survives as legacyChatEligibility() until the B1 migration, and no registry provider declares a descriptor yet, so outbound wire bytes and catalog bytes are unchanged. The A0 characterization suites pass unmodified except the raw-body observation test whose A0 comment scheduled this exact update. Full suite at this commit: 12970 pass / 10 skip / 0 fail. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Summary
Phase A1 of the FastWire umbrella (#1886): a behavior-preserving refactor that lands the FastWire policy foundation —
FastWiredescriptors,FastPolicyAuthoritycapture, the sharedresolveFastPolicy()resolver, and theTierDecisionstate machine — behind the A0 characterization suite.Stacked on #1892. Because both PR heads live in a fork, GitHub cannot select the parent fork branch as this PR's base; the base therefore remains
dev. Review the A1 commits39dd29630and33e9b4124. This branch will be rebased after #1892 lands.What changes internally
src/providers/fastwire.ts: centralizes adapter resolution, declaration tri-state, capability/eligibility, and tier decisions.src/providers/service-tier.ts: captures and caches policy authority and exposes the shared eligibility projection.src/server/responses/core.ts: resolves policy once, records a tier decision, and preserves the caller-owned raw request body.No registry provider opts into a new declaration in A1, so existing default wire and catalog output remains pinned by A0.
Review follow-up
supportsServiceTier: falseprecedence for direct and inherited capability checks.fastWire: nullconflicts, with a diagnostic warning instead of backup/default fallback.foreignCallerTiers: "drop"for classified foreign caller tiers while retaining the documented unclassified full-passthrough branch.forward-callerimmutability case, and bounded/redacted capability-gap warnings.Verification
bun run test: 12,983 pass / 10 skip / 0 fail (12,993 tests across 824 files).bun run typecheck: pass.bun run privacy:scan: pass.git diff --check: pass.dev, exactly within the repository's accepted review-readiness freshness window.Part of #1886 (Phase A1). Next: B0 observability, then the B1 capability semantic migration.
Review readiness checklist
All CI tests are green on my local testing.
I pushed my PR to the latest dev commit.
I resolved all correct Codex and CodeRabbit findings.
My PR is ready for review.
Summary by CodeRabbit
New Features
Bug Fixes
Tests