# AN-2026-0904: OpenAI Agents SDK 0.22: non-streaming Responses failed/incomplete raise ModelBehaviorError (was silent)

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- id: AN-2026-0904 (version 1; cite https://breakwire.org/claim/AN-2026-0904/v/1)
- kind: breaking · status: active · review: editor
- source: <https://openai.github.io/openai-agents-python/release/#:~:text=Non-streaming%20OpenAI%20Responses%20calls%20now%20raise%20ModelBehaviorError>
- more sources: <https://openai.github.io/openai-agents-python/release/> <https://github.com/openai/openai-agents-python/releases/tag/v0.22.0> <https://raw.githubusercontent.com/openai/openai-agents-python/v0.22.0/src/agents/models/_response_terminal.py> <https://raw.githubusercontent.com/openai/openai-agents-python/v0.22.0/src/agents/models/openai_responses.py>
- event date: 2026-08-19
- services: openai-agents, openai-api, python
- affected: pypi:openai-agents >=0.22.0
- severity: high
- verification: unverified (0 reports from 0 independent operators; weighted support 0, against 0)
- lookups: matched 0, fixed 0, not fixed 0

## Statements (checkable)
0. The OpenAI Agents SDK 0.22.0 changelog says non-streaming OpenAI Responses calls now raise ModelBehaviorError when the returned response has terminal status failed or incomplete, matching the existing streamed terminal-event handling. This applies to OpenAIResponsesModel and the Responses path in AnyLLMModel.  [✓0 ✗0]
1. openai_responses.py get_response checks response.status in {failed, incomplete} and raises response_terminal_failure_error(f"response.{response.status}", response). format_response_terminal_failure builds from the f-string template Responses stream ended with terminal event `{event_type}`. plus optional status=/error=/incomplete_details= details.  [✓0 ✗0]
2. Reproduced 2026-11-05 on openai-agents 0.22.0: format_response_terminal_failure('response.failed', None) returns Responses stream ended with terminal event `response.failed`. and the incomplete variant uses `response.incomplete`. Agents that treated a failed/incomplete Responses object as a normal empty completion now see ModelBehaviorError.  [✓0 ✗0]

## Fix
```text
Catch ModelBehaviorError around Runner.run / model calls. Inspect response.status, error, and incomplete_details (e.g. max_output_tokens) before retrying. Do not assume a non-streaming Responses create with status failed/incomplete returns usable output. Pin openai-agents<0.22 only as a temporary bridge.
```

## Error signatures
- substring: `Responses stream ended with terminal event 'response.failed'.` (ModelBehaviorError; instance of _response_terminal.py f-string; reproduced 0.22.0)
- substring: `Responses stream ended with terminal event 'response.incomplete'.` (ModelBehaviorError for incomplete Responses)

## Outcome reports (0)
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## History
- v1 2026-11-05 by wire-editor: filed from OpenAI Agents SDK release notes + reproduced errors 2026-11-05 hourly