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feat(vertex): resolve each API key's project with project "auto" - #7296
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An express-mode Vertex API key belongs to one Google Cloud project, but the projectless express endpoint routes to a default region where global-only models such as gemini-4-argon return 404. lidge-jun#7266 fixed this for a single configured provider.project, which cannot serve an apiKeyPool whose keys belong to different projects: every key but one then gets 403. provider.project: "auto" resolves the project of the key each request actually sends. One countTokens call for a nonexistent model to the fixed aiplatform.googleapis.com authority returns a NOT_FOUND that names projects/<number>/; that number is cached per key digest (64-entry LRU), concurrent first requests share one probe, and the request then takes the ordinary project endpoint and per-project replay namespace. A probe that does not reveal a project is not cached and that request uses express, so Google's own 401/403/429 still drives key-pool failover. ADC rejects "auto". Configurations without "auto" are unchanged.
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Merge Risk: 🟡 Moderate · up to
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| Check name | Status | Explanation | Resolution |
|---|---|---|---|
| Docstring Coverage |  |
Docstring coverage is 76.92% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 13 functions across 5 files. (3 skipped: … | Write docstrings for the functions missing them to satisfy the coverage threshold. |
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Check name Status Explanation Description Check Check skipped - CodeRabbit’s high-level summary is enabled. Title check The title clearly and concisely describes the main change: adding Vertex API-key project resolution through project "auto". Linked Issues check Check skipped because no linked issues were found for this pull request. Out of Scope Changes check Check skipped because no linked issues were found for this pull request.
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Docstring coverage is 76.92% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 13 functions across 5 files. (3 skipped: 3 unsupported.)
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Write docstrings for the functions missing them to satisfy the coverage threshold.
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Actionable comments posted: 2
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Inline comments:
Review comments at @src/adapters/google-vertex-key-project.ts:
- Line 1: Replace the Node-only createHash usage in the cache-key hashing logic
with Bun.CryptoHasher configured for SHA-256, preserving the existing base64url
digest format.
Review comments at @src/adapters/google.ts:
- Line 1215: Update the endpoint selection around vertexEndpoint so resolving
provider.project does not move an Express Mode API-key request to a
project-scoped endpoint. Keep the Express endpoint for these keys, and select
the project endpoint only when the request uses bearer authentication or a
supported authorization key.
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docs-site/src/content/docs/fr/reference/configuration/providers.mddocs-site/src/content/docs/ja/reference/configuration/providers.mddocs-site/src/content/docs/ko/reference/configuration/providers.mddocs-site/src/content/docs/reference/configuration/providers.mddocs-site/src/content/docs/ru/reference/configuration/providers.mddocs-site/src/content/docs/tr/reference/configuration/providers.mddocs-site/src/content/docs/zh-cn/reference/configuration/providers.mddocs-site/src/content/docs/zh-tw/reference/configuration/providers.mdscripts/test-layout/layout.jsonsrc/adapters/google-vertex-endpoint.tssrc/adapters/google-vertex-key-project.tssrc/adapters/google.tssrc/types/provider.tsstructure/providers/google.mdtests/adapters/google/google-vertex-key-project.test.tstests/fixtures/test-layout-expected.json
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Correctness/resource review at 9403064. Per-key endpoint selection needs to preserve the request transport/cancellation and bounded-body contracts. The two regressions below are on the new discovery path; no live Vertex requests or credential probes were run. The existing 404-message experiment is not a documented stable discovery/no-billing contract, so please also retain dated primary evidence and the explicit-auto opt-in limitation. Functional hosted CI is not present in the current-head rollup I inspected; bot/hygiene success alone is not that coverage.
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Inline comments:
Review comments at @src/adapters/google.ts:
- Around line 1213-1218: Remove incoming?.providerFetch from the options passed
to resolveVertexApiKey in the Responses runTurn path, allowing the resolver to
use its provider egress transport without inference admission hooks. Preserve
the abort signal, provider, and providerName options.
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Re-review at 02d4026: The probe uses the selected egress/HTTP-version context, bounded 4096-byte decoding/deadlines, and per-waiter cancellation with last-waiter abort. Both original transport/cancellation and unbounded-body findings are addressed.
Independent capped Linux/Bun 1.4.3 focused validation: 20 passed, 0 failed in isolated homes. I am withdrawing review 5563137459 as superseded. The opt-in undocumented Vertex discovery/no-billing capability and destination review remain separate from these regression fixes; no live key probe was sent.
Current-head required CI/readiness remain outstanding. No workflow approval, live runtime change, new scan or merge was performed.
Specific original blocker(s) fixed at 02d4026; 20 focused tests independently pass. Separate current-head CI, readiness and required owner/boundary review remain outstanding; this withdrawal is not whole-PR approval.
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Inline comments:
Review comments at
@docs-site/src/content/docs/reference/configuration/providers.md:
- Line 398: Update the `project?` documentation row to clarify that successful
project discoveries are cached, while unresolved keys may be probed again on
subsequent requests; preserve the existing explanation of express mode and ADC
behavior.
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| // provider.proxy) must reject the caller rather than being swallowed into an express fallback. | ||
| const fetchImpl = selectProbeFetch(opts); | ||
| const timeoutMs = opts.timeoutMs ?? PROBE_TIMEOUT_MS; | ||
| const entry = inflight.get(key) ?? startInflight(key, apiKey, fetchImpl, timeoutMs); |
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When two provider entries share an API key but use different proxy or provider.fetch routes, overlapping first requests both use this digest-only inflight entry, so only the first entry's fetchImpl is executed and the second entry's explicit egress policy is silently ignored for the authenticated probe. Keep the resolved-project cache per key if desired, but scope in-flight coalescing by the provider/egress identity so one provider cannot send another provider's probe through its proxy or custom transport.
AGENTS.md reference: AGENTS.md:L446-L452
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| let vertexEndpoint = selectVertexEndpoint(provider, Boolean(apiKey)); | ||
| if (apiKey && vertexEndpoint.kind === "project" && vertexEndpoint.project === VERTEX_PROJECT_AUTO) { | ||
| // Unresolved keys use express for this request so Google's status drives key failover. | ||
| const project = await resolveVertexApiKeyProject(apiKey, { |
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With project: "auto" and an uncached key, this call sends x-goog-api-key to Google before vertexInferenceUrl validates the caller-controlled model ID and configured location on line 1239. Inputs such as model a/b or location attacker.example/capture, which tests/adapters/google/gcp-adc.test.ts:212-229 expects to be rejected before any credential is attached, now cause an authenticated countTokens request first (and repeat it after lookup failures); validate the model path and location before starting discovery.
AGENTS.md reference: AGENTS.md:L446-L452
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| const base = customFetch ?? defaultOutboundFetch; | ||
| const providerName = options.providerName ?? "google-vertex"; | ||
| return ((input: Parameters<typeof fetch>[0], init?: RequestInit) => { | ||
| const egressInit = providerEgressSendInit({ providerName, provider }, base, input); |
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This introduces a distinct provider-egress request path, but structure/INDEX.md:172 maps src/adapters/ changes to structure/transports/inventory.md, whose per-provider egress table at lines 155-176 still omits Vertex project discovery. Add the probe's honored/refused routing contract to that inventory; updating only structure/providers/google.md leaves the mapped transport contract incomplete.
AGENTS.md reference: structure/AGENTS.md:L49-L52
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Summary
A Vertex key pool whose express-mode API keys belong to different Google Cloud projects cannot reach global-only models such as
gemini-4-argontoday. The projectless express endpoint routes to a default region and returns 404. #7266 fixed this for one configuredprovider.project, but with a pool, every key outside that project then gets 403.This adds an explicit opt-in:
provider.project: "auto"resolves the project of the key each request actually sends.countTokenscall for a nonexistent model goes to the fixedaiplatform.googleapis.comauthority (manual redirects, 10 s timeout). Google's NOT_FOUND namesprojects/<number>/locations/..., and that number is the project. The probe runs no model.locationdefaulting toglobal."auto". GCP project ids are at least 6 characters, so"auto"cannot collide with a real one. Configurations without"auto"are byte-identical to today.Example:
Before:
gemini-4-argonreturns 404 for every key (express), or 403 for keys outside the configured project. After: each key reaches/v1/projects/<its number>/locations/global/....Design notes
buildRequest. It follows the global proxy environment, but like the token exchange it does not take a per-providerproxy.Verification
bun test tests/adapters/google/google-vertex-key-project.test.ts: 20 pass, 0 fail (including bounded 4 KiB 404 body ceiling, oversized continuous stream cancellation, stalled 404 body timeout, invalid UTF-8 rejection, IncomingMeta.providerFetch and provider.proxy egress routing, abort-before-probe, and coalesced waiter cancellation without cancelling sibling waiters). Coverage: each pool key resolves its own project; regional location; a single probe per key, including concurrent first requests; 401/403/429/503 and network failures fall back to express without caching; rotation to another key resolves that key's project; per-project replay keys; an explicit project or no project never probes; ADC rejects"auto". With thegoogle.tschange reverted, 8 of these fail.bun teston the Vertex suites (gcp-adc,gcp-sa-adapter,google-vertex-stream,google-vertex-http,google-vertex-thought-signature,vertex-catalog, and the new file): 142 pass, 0 fail.OCX_TEST_NO_QUEUE=1 bun test tests/adapters/google/: 834 pass, 4 fail. These are the same four Antigravity roster/discovery cases fix(vertex): honor project and location for API-key inference #7266 documents as failing identically on unmodified dev when the directory runs in one process.bun test tests/ci-workflows/ tests/test-layout.test.ts tests/test-layout-tooling.test.ts: 1574 pass, 7 fail. A cleanorigin/devworktree (8640c2f) shows the identical 7 failures on this machine (pinned test-runner and spawnSync cases).bun run typecheck,bun run structure:check,bun run privacy:scan: exit 0.gemini-4-argonreturned 200 for each, and each request went to its ownprojects/<number>/locations/globalendpoint.bun run testwas not run locally because of the runner-environment failures above. That coverage is left to CI.Checklist
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Summary by CodeRabbit
New Features
project: "auto"to resolve each key’s project independently, allowing key pools to span multiple projects. Successful lookups are cached; if resolution fails, requests use the express endpoint."auto"and continue to use the configured project or supported environment-variable fallback.Documentation