Distillation

Date: Sep 16, 2026

• 🔴 (13:47) User directed that Responses events must “Always accumulate into the internal state for postResponse.” This requirement appears in packages/gateway/src/pipeline.ts near line 10368.
• 🟡 (13:47) The additional packages/gateway/src/pipeline.ts excerpt (lines 10047–10910) includes principal-stream handling with principalReader, principalReadFinished, principalTransportRetries, and an outcome type containing "principal_unexpected".
• 🟡 (13:47) The excerpt manages deferred output visibility and recall processing through pendingRecalls: PendingResponsesRecall[], promoteDeferredCandidate(outputIndex), resolvingVisibleTool, visible/source output indices, and a "post_output" classification.
• 🟡 (13:47) Responses SSE parsing throws Error(\malformed JSON in Responses event ${event}`)for malformed event JSON and can throwSSEStreamLimitError` when stream limits are exceeded.
• 🟡 (13:47) Continuation handling creates contState with makeResponsesAccState(), tracks deferredContinuationBytes, accounts for continuation streams after each follow-up, and skips continuation payloads when !cd || cd === "[DONE]".