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Treat model-not-found provider errors as terminal failures (#56445)

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## Why

Provider errors with code `model_not_found` should end the turn immediately and preserve the provider's message instead of triggering retries.

## What changed

- Recognize `model_not_found` in HTTP 400, 403, and 404 responses and in streamed `error` and `response.failed` events.
- Preserve the provider message and any available HTTP status, and expose `modelNotFound` through the app-server protocol and generated schemas and SDK types.

## Testing

Add coverage for HTTP classification, statusless stream errors, and terminal failures without retries across HTTP, SSE, and WebSocket responses. Verify that `thread/read` preserves the error reported by the live notification.

GitOrigin-RevId: 88f824ac03c8c9669915b1e40c67b76c08326fbe
This commit is contained in:
Charlie Marsh
2026-10-23 11:43:14 +00:00
committed by copyberry
parent ca9d103f39
commit 60adfa8513
39 changed files with 190 additions and 67 deletions
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codex-rs/app-server-protocol/schema/json/v2/ThreadMetadataUpdateResponse.json
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@@ -64,6 +64,7 @@
"rateLimitExceeded",
"flexUnavailable",
"serverOverloaded",
"modelNotFound",
"cyberPolicy",
"misalignmentPolicyViolation",
"tooManyDenials",