Distillation

Date: Sep 16, 2026

• 🔴 (10:58) User supplied a continuation of packages/gateway/test/openai-responses-stream.test.ts, approximately lines 4064–4890. The tests cover principal Responses streaming behavior including single emission of response.created, replacement of provider failure diagnostics with a fixed public failure envelope, rejection of non-monotonic failure sequences, handling diagnostics before response.created, parameterized provider events "error" and "response.error", crossed diagnostic aliases, safe live output, terminal statuses "response.incomplete" and "failed", malformed terminal output, and usage-bearing terminal responses.
• 🔴 (10:59) User supplied the next continuation of packages/gateway/test/openai-responses-stream.test.ts, approximately lines 4896–5290. The tests cover failure delivery under backpressure, synthesis of response.failed when the upstream ends without a terminal event, upstream cancellation, immediate forwarding of readable live bytes, terminal usage { input_tokens: 12, output_tokens: 3 }, finalization when the client cancels immediately after the terminal event, filtering synthetic message frames and trailing data: [DONE], propagation/finalization after new Error("upstream exploded"), and behavior with an upstream stream that remains open.
• 🔴 (10:59) User stated the upstream stream used in the test around packages/gateway/test/openai-responses-stream.test.ts:5278 never closes on its own.