fix(google): retry transient 429/5xx for AI Studio direct requests - #1851
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📝 WalkthroughWalkthroughThe Google HTTP layer adds configurable invalid-400 repair, raw quota inspection, and direct Gemini retries. Provider-specific fetch executors now pass through adapter, image, server, and upstream retry paths. Tests cover retries, failover, pacing, protocol selection, raw errors, and adapter wiring. ChangesGoogle retry and provider executor flow
Estimated code review effort: 3 (Moderate) | ~25 minutes Sequence Diagram(s)sequenceDiagram
participant ServerResponses
participant GoogleAdapter
participant fetchDirectGeminiWithRetry
participant ProviderFetch
participant GeminiAPI
ServerResponses->>GoogleAdapter: pass providerFetch with provider context
GoogleAdapter->>fetchDirectGeminiWithRetry: send AI Studio request
fetchDirectGeminiWithRetry->>ProviderFetch: execute request
ProviderFetch->>GeminiAPI: fetch upstream request
GeminiAPI-->>ProviderFetch: success, 503, or 429 response
ProviderFetch-->>fetchDirectGeminiWithRetry: return provider response
fetchDirectGeminiWithRetry->>GeminiAPI: retry eligible transient response
fetchDirectGeminiWithRetry-->>GoogleAdapter: response or raw final provider error
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Inline comments:
In `@src/adapters/google-http.ts`:
- Around line 104-116: The raw-mode retry flow in fetchGoogleWithRetry must keep
quota-exhausted 429 responses single-shot: inspect the 429 body via res.clone(),
and return the original response without retrying when isQuotaExhaustedBody
classifies it as exhausted, while preserving retries for other transient 429s.
Add a direct-Gemini regression test covering fetchDirectGeminiWithRetry, and
flag any provider/adapter contract drift in src/**.
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src/adapters/google-http.tssrc/adapters/google.tstests/google-vertex-http.test.ts
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Wibias
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Wibias
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I found two merge-blocking issues in the current implementation.
- P1: Direct Gemini retries delay existing API-key pool failover.
fetchDirectGeminiWithRetry() sends plain transient 429s through fetchGoogleWithRetry(), which retries the same request and therefore the same API key up to three times before the server sees the 429. The Responses server already owns multi-key 429 failover: on the first 429 it cools the failed key and rotates to the next available key. With this PR, an AI Studio provider with apiKeyPool can hit key A three times before key B is tried.
Expected sequence:
key A -> 429
rotate
key B -> retry
Current sequence:
key A -> 429
key A -> 429
key A -> 429
server sees 429
key B -> retry
Hard quota exhaustion is now correctly single-shot after the latest fix, but ordinary rate-limit 429s still have this problem. Please preserve server-owned key-pool rotation priority over same-key adapter retries. Add an integration regression with two Gemini keys where A returns 429 and B returns 200, asserting A is sent exactly once and B exactly once.
- P1: Direct Gemini now bypasses the canonical provider transport for physical retry attempts.
The AI Studio adapter now installs fetchResponse, and fetchDirectGeminiWithRetry() ultimately performs each attempt through fetchWithAttemptDeadline(), which calls global fetch() directly. Previously direct Gemini used the server's providerFetch(...) path. That path applies provider transport policy such as upstreamHttpVersion, provider/injected fetch implementations, and request pacing.
The server does one pacing wait before entering activeAdapter.fetchResponse, but second and third attempts happen inside the adapter and therefore do not traverse the canonical per-send provider transport. A configured upstreamHttpVersion can also be silently ignored by this path. As a side effect, server-level attempt instrumentation can still report one logical send while the adapter performs multiple physical requests.
Please make every physical AI Studio retry use the same canonical provider executor/transport as the initial request. A clean solution would be to pass an executor through AdapterFetchContext, move this retry to the server transport layer, or use a shared retry primitive that wraps the existing provider executor rather than global fetch. Add regressions for AI Studio retries with upstreamHttpVersion, request pacing, and API-key pool rotation.
The core retry idea is good: raw final errors, single-shot direct 400s, bounded retries, response-body cancellation, abort propagation, and hard-quota classification are all appropriate after the latest fix.
One process note: this review is anchored to b8f109a89570ff0d122045ce585cfd694975991c. The branch is currently 11 commits behind dev, while the repository readiness policy permits at most 10 commits behind. Please update/rebase onto current dev and rerun exact-head CI after fixing the two issues above.
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AI Studio direct (generativelanguage.googleapis.com) requests went through the
default server fetch path, which retries connection resets but never HTTP error
statuses. During capacity spikes the upstream returns 503 UNAVAILABLE ("This
model is currently experiencing high demand") and every affected turn failed
immediately (sendCount=1 in the request log), while Vertex and Antigravity
already had Kiro-style bounded retry.
Route direct AI Studio through the shared Google retry wrapper with the existing
surface preserved: raw Provider error <status>: <body> text (no classification)
and single-shot 400 semantics (no request-shape compatibility replay).
Transient 500/502/503/504 and plain rate-limit 429s are now retried up to 3
attempts with Retry-After honoring and jittered backoff.
Covered by focused tests: a transient 503 retries into success, a final 400
keeps its raw body and is not replayed, and rate-limit 429s stay bounded at 3
attempts with the raw body returned on exhaustion.
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| executor: providerFetch(route.provider, options.codexWsRuntimeIdentity, { | ||
| providerName: route.providerName, | ||
| modelId: route.modelId, | ||
| }), |
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When request pacing is enabled for Vertex or Antigravity, this branch first calls waitForProviderRequestSlot and then passes a paced providerFetch to the Google adapter; fetchWithAttemptDeadline invokes that executor, which acquires a second slot for the same physical send. Every initial request is therefore delayed by a full pacing interval, and if that interval exceeds connectMs, the second wait is aborted by the response-header deadline before any network request is made. Let the adapter executor perform the admission exactly once per physical attempt, without retaining the outer pre-wait for this path.
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| export function fetchDirectGeminiWithRetry(request: AdapterRequest, ctx: AdapterFetchContext = {}): Promise<Response> { | ||
| return fetchGoogleWithRetry("Gemini", request, { ...ctx, returnRawErrors: true }, { repairInvalid400: false }); |
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For a single-key AI Studio provider without the opt-in retryOn429 setting, a transient 429 still surfaces after one attempt: createGoogleAdapter deliberately leaves direct mode without fetchResponse, while the canonical fetchWithTransientRetry path retries only 5xx statuses. Consequently, this newly tested helper and its quota-vs-rate-limit classification are never used by a real direct request. Integrate that classification into the server path while preserving immediate key-pool rotation, and cover the actual server request rather than only this standalone export.
AGENTS.md reference: AGENTS.md:L276-L278
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Close the five regressions that turned dev-head CI red at aaf0469: - core.ts: scope the lidge-jun#1851 transient-5xx retry to the direct Google adapter. The generic openai-chat path returned to reset-only retry, so combo failover hops on the first 5xx again instead of burning three same-target attempts per hop (6 combo e2e failures, 2 sidecar-auth timeouts). - commandcode-provider.test.ts: lidge-jun#1800 surfaces the curated effort table; the sibling test still expected [] (its hyphenated twin was updated). - bridge-raw-reasoning-hidden.test.ts: lidge-jun#2007 routes visible raw reasoning through the expandable summary channel; two tests still asserted the retired content-channel shape. - codex-app-server-processes.test.ts + cli-restore-back.test.ts: lidge-jun#1931 intentionally refreshes the ocx-side catalog/cache during explicit sync while Codex integration is OFF; the source-inspection and message assertions now track that contract (Codex config mtime is still asserted untouched). - gui models-empty-provider test: lidge-jun#1991 renamed the dialog button to "Custom windows"; the test still clicked "Context windows". Plus the WP-V stabilization audit plan doc for the campaign unit.
Summary
generativelanguage.googleapis.com, e.g.google-peace/ personal AI Studio providers) failed immediately withProvider error 503: ... This model is currently experiencing high demandduring upstream capacity spikes. The request log showedsendCount: 1with no retry, while Vertex and Antigravity already had Kiro-style bounded transient retry.fetchWithResetRetryon the server, which retried connection resets only and never HTTP error statuses. Transient 5xx responses were returned to the client on the first attempt.fetchWithTransientRetry), retrying transient 5xx (500/502/503/504/520/521/522) up to 3 attempts with jittered exponential backoff andRetry-Afterhonoring.providerFetch, ensuring that provider transport policies (upstreamHttpVersion,requestPacing, custom fetch executors) and attempt logging (recovery: "transient-5xx") apply consistently across retries.429 Too Many Requests: multi-key providers withapiKeyPoolfail over immediately on the first 429 without delaying rotation with redundant single-key retries.AdapterFetchContextwithexecutor?: typeof globalThis.fetchso adapter-managed fetch flows (e.g. Vertex AI, Antigravity, image bridge) also use the canonical provider transport.Verification
bun run typecheck— passed.bun run privacy:scan— passed.bun test tests/google-vertex-http.test.ts tests/server-key-failover-e2e.test.ts tests/upstream-http-version.test.ts tests/request-pacing.test.ts— 57 passed, 0 failed (including key-pool 429 single-shot failover,upstreamHttpVersionprotocol pinning on Google attempts, and request pacing slot verification).bun test tests/google-adapter.test.ts tests/google-hardening.test.ts tests/google-vertex-stream.test.ts tests/google-vertex-thought-signature.test.ts tests/google-antigravity-wire.test.ts tests/google-wire-compiler.test.ts tests/google-tool-schema.test.ts tests/google-models-listing.test.ts tests/gemini-37-flash-migration.test.ts tests/identity-neutralize.test.ts— 265 passed, 0 failed.Checklist
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Improvements
Bug Fixes