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970e14725b
OpenAI Responses API supports background: true for async/deferred runs (returns 202 with response_id + GET /responses/<id> polling). Implementing the full background contract requires queue/poll infrastructure that OmniRoute does not have as a forward proxy. Previously the translator rejected such requests with HTTP 400 "Unsupported Responses API feature: background mode is not supported by omniroute". This breaks clients that opportunistically set background=true for long-running tasks (Capy Captain Pro, Codex agents) even when the underlying execution would complete in a normal HTTP timeout window. Degrade silently: strip the background flag and run synchronously. The client receives the full response in one round-trip with status=completed. Clients that strictly require the async contract still observe a completed response on the first poll and can adapt. The existing test that asserted background=true throws is split into two: - the unsupported-tool-type branch keeps the throw assertion - the background branch now asserts the flag is stripped and translation completes with the expected messages Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>