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fix(proxy): answer Codex model discovery instead of 404ing it - #1453
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📝 WalkthroughWalkthroughThe Codex proxy now supports ChangesCodex model discovery
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: 🟡 Moderate · up to The change enables Codex model discovery, but the current implementation can hang requests, fail unnecessarily when credentials become stale, and allow a regression test to pass despite an upstream 400 caused by dropped query parameters. Merge readiness therefore requires follow-up on these bounded correctness and availability risks. Suggested reviewers: Sequence Diagram(s)sequenceDiagram
participant CodexCLI
participant CodexProxy
participant PooledAccounts
participant UpstreamCodex
CodexCLI->>CodexProxy: GET /backend-api/codex/models?client_version=...
CodexProxy->>PooledAccounts: Load and select account
CodexProxy->>UpstreamCodex: Forward query and authenticated request
UpstreamCodex-->>CodexProxy: Return status and content type
CodexProxy-->>CodexCLI: Relay upstream response
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In `@src/lib/server/routes/codexProxyRoutes.ts`:
- Around line 650-654: Update the upstream model-discovery fetch in the codex
proxy route to include an AbortSignal.timeout value, matching the timeout
pattern used by the responses route. Preserve the existing URL, method, and
headers while ensuring stalled upstream requests are aborted.
- Around line 650-661: Update the upstream response handling in the surrounding
model-discovery request flow to detect 401 and 403 responses before returning
the Response, then apply the existing forced account refresh and rotation
behavior used by handleCodexResponsesRequest and retry the fetch once with
refreshed credentials. Preserve the current status, body, and content-type
forwarding for the final response.
In `@test/continuous-test-suite-proxy.ts`:
- Around line 610-627: Update testCodexModelsDiscovery to treat an HTTP 400
response from the Codex models endpoint as a failure, logging it as an error and
returning false. Preserve success for valid responses and tolerance only for the
existing explicitly accepted unavailable-account or transient-upstream statuses.
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docs/features/codex-proxy-support.mdsrc/lib/auth/codexOAuth.tssrc/lib/server/routes/codexProxyRoutes.tstest/continuous-test-suite-proxy.ts
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The Codex CLI refreshes its model list on every invocation, hitting GET /backend-api/codex/models?client_version=<v>. Only /responses was registered, so that GET 404'd, the CLI printed a refresh failure and fell back to a default model — quietly ignoring the model the user had configured. This relays rather than synthesises, unlike the Claude and OpenAI /v1/models routes which build their lists from the model router. Codex model availability is a property of the upstream account (plan tier, rollout), not of anything this proxy knows, so a synthesised list would be a guess that looks authoritative. The query is rebuilt from ctx.query, not ctx.path: path carries no query string, so reading it there dropped client_version, which upstream requires and answers 400 for. Review follow-ups, all three real: Bounded the upstream call with AbortSignal.timeout, as the responses route already does. Without a signal a stalled connection held the proxy request open with no ceiling, blocking the CLI at startup. Added a forced token refresh and account rotation on 401/403. A token can be rejected upstream while still inside its local expiry window; relaying that 401 straight back left discovery broken until the token expired locally. Deliberately WITHOUT the cooldown and account-disable that the responses path applies: discovery fires on every CLI invocation, so letting it disable an account would turn a background probe into a forced re-login. The route's doc comment now states that precisely instead of claiming it is side-effect free, which it is not — a refreshed token is persisted. Fixed a false green in the suite. The test accepted any status except 404 and 405, so it also accepted 400 — precisely what upstream returns when client_version is dropped, the bug this route exists to fix. It passed on the regression it was written to catch. The tolerated set is now an allow-list (200, 401, 502, 503) with 400 called out by name. Verified: typecheck 4830 files 0 errors, eslint clean, proxy suite 65 passed / 0 failed / 6 skipped. Removing 401 from the allow-list makes the case report a real failure rather than a skip, so the assertion is load-bearing.
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All three findings were real and are fixed in 1. Unbounded model-discovery fetch — fixed as suggested. Added 2. No refresh/rotation on 401/403 — fixed, but deliberately not a copy of the responses flow. Discovery now forces one token refresh per account and rotates through the pool, which fixes the reported problem: a token rejected upstream while still inside its local expiry window left discovery broken until it expired locally. What I did not carry over is the cooldown and the account-disable. Those belong to the responses path because the verdict is earned by a request the user actually made. Discovery fires on every CLI invocation — giving it the power to disable an account would turn a background probe into a forced re-login. So the rotation is there, the penalties are not. That also made the existing doc comment wrong, so I corrected it rather than leaving it: the route is not "side-effect free" — a refreshed token is persisted, exactly as the proactive refresh in 3. Test accepted HTTP 400 — fixed, and this was the most serious of the three. The test excluded 404 and 405 and accepted everything else, so it also accepted 400. 400 is precisely what upstream returns when The tolerated set is now an allow-list ( Verification: typecheck 4830 files / 0 errors, eslint clean, proxy suite 65 passed / 0 failed / 6 skipped. I also mutated the new assertion — removing 401 from the allow-list — and confirmed the case reports a real |
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Review SummaryDecision: APPROVED ✅This PR adds model discovery support for the Codex (ChatGPT) proxy, completing the missing Changes Reviewed
Review Details✅ Documentation (codex-proxy-support.md)
✅ Type Definition (codexOAuth.ts)
✅ Route Handler (codexProxyRoutes.ts)
✅ Test Coverage (continuous-test-suite-proxy.ts)
Impact Analysis
CLAUDE.md Compliance✅ Rule 4 (CLI ≠ SDK): Pure server-side code, no SDK concerns RecommendationAPPROVE - This is a well-implemented feature addition that completes the Codex proxy's model discovery capability. The implementation follows established patterns, includes comprehensive tests, and properly documents the behavior. Reviewed using Yama autonomous code review agent standards |
Review SummaryAll previously identified issues have been resolved:
The implementation follows Claude proxy patterns with comprehensive tests and documentation. The PR is ready for merge. |
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🎉 This PR is included in version 11.17.3 🎉 The release is available on: Your semantic-release bot 📦🚀 |
Closes #1383.
Before
The proxy registered exactly one Codex route. Against the running daemon:
Every
codexinvocation printedfailed to refresh available models: unexpected status 404 Not Foundand then silently fell back to a default model — quietly ignoring whichever model the user configured. The error line scrolls past; the wrong model gets misdiagnosed weeks later.After
Against a proxy started from the built CLI, answering the CLI's exact request:
A real model list, relayed from ChatGPT upstream through the account pool.
Why relay, not synthesise
The Claude and OpenAI
/v1/modelsroutes build their lists locally from the model router. Codex model availability is a property of the account — plan tier, rollout state — which this proxy does not know. A locally-built list would be a guess that reads as authoritative, so this one relays.Discovery is side-effect free: no cooldown recorded, no quota consumed, so the once-per-invocation refresh cannot perturb routing for real traffic. A cooling account may still answer it — being rate-limited for completions does not make an account unable to say which models exist.
A defect the end-to-end test caught
The first implementation read the query string off
ctx.path.ctx.pathcarries no query string, soclient_versionwas dropped and upstream answered400with a pydanticField requiredon('query','client_version'). Rebuilt fromctx.query.No unit test would have found that — it only surfaces when a real request reaches the real upstream. The regression test therefore drives a spawned proxy the way the CLI drives it, and asserts against
404specifically, so a route that exists but errors still passes while an unroutable one fails.Worth noting for anyone iterating here:
pnpm run build:clidoes not rebuildsrc/lib, so a route added tocodexProxyRoutes.tsstays invisible until a fullpnpm run build. That cost me a debugging cycle.Verification
tsc --noEmit --stricteslint src testpnpm run buildcontinuous-test-suite-proxycontinuous-test-suite-codexTest watched failing first:
Codex model discovery is unroutable — the CLI cannot list models.Summary by CodeRabbit
New Features
Bug Fixes