detect_rejection

Detect a client-issued rejection of a pending interrupt.

Default implementation scans the request for an mcp_approval_response item whose decision cannot be translated. This includes custom interrupt rejections and HumanInTheLoopMiddleware decisions not allowed for every action. When found, :meth:handle_create short-circuits the turn into response.failed(code="interrupt_rejected", …).

Override to plug in custom rejection protocols (e.g. recognising a sentinel function_call_output payload as a rejection).