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Surface Flex capacity failures as a distinct terminal error - #47967
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copyberry[bot] merged 1 commit intoSep 24, 2026
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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
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Surface Flex capacity failures as a distinct terminal error
What changed
flex_unavailablein HTTP 429 responses and streamederrorandresponse.failedevents. End normal turns without retries and reportFlex capacity unavailable.flexUnavailablethrough the core and app-server protocols and generated schemas and SDK types.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.