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Surface Flex capacity failures as a distinct terminal error (#47967)

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## What changed

- Recognize `flex_unavailable` in HTTP 429 responses and streamed `error` and `response.failed` events. End normal turns without retries and report `Flex capacity unavailable.`
- Expose `flexUnavailable` through the core and app-server protocols and generated schemas and SDK types.
- Keep Flex capacity failures eligible for Guardian review and sampler retries, with a distinct telemetry classification.
- Map unexpected HTTP responses to `HttpConnectionFailed`, preserving their status codes.

## Testing

Add regression coverage for terminal Flex failures over HTTP, SSE, and WebSocket, HTTP 504 status preservation after a stream retry, and protocol serialization. Update Guardian retry and sampler recovery tests to cover Flex failures.

GitOrigin-RevId: f2e03a6d2d36a6d9748c35952e40397f8670d121
This commit is contained in:
Steve Coffey
2026-09-24 23:33:38 +00:00
committed by copyberry
parent 8f103417ef
commit dafb133c5b
39 changed files with 259 additions and 11 deletions
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sdk/python/src/openai_codex/generated/v2_all.py
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@@ -543,6 +543,7 @@ class CodexErrorInfoValue(Enum):
session_budget_exceeded = "sessionBudgetExceeded"
usage_limit_exceeded = "usageLimitExceeded"
rate_limit_exceeded = "rateLimitExceeded"
flex_unavailable = "flexUnavailable"
server_overloaded = "serverOverloaded"
cyber_policy = "cyberPolicy"
misalignment_policy_violation = "misalignmentPolicyViolation"