Distillation

Date: Sep 16, 2026

• 🟡 (15:42) User supplied a continuation of the recall-aware Responses streaming implementation spanning approximately lines 9346-10695, covering terminal-item comparison, SSE frame parsing, recall execution, follow-up execution, synthetic response events, usage projection, cancellation, keepalive handling, visible-output indexing, stream limits, and pending recalls.
• 🔴 (15:42) User directed: “Always accumulate into the internal state for postResponse.” This requirement appears twice in the supplied implementation, near lines 10379 and 10483.
• 🟡 (15:42) Recall execution uses opts.onRecall; follow-up execution uses opts.runFollowUp, and asynchronous work is raced against an abort path via Promise.race([operation, abort]).
• 🟡 (15:42) Synthetic message item IDs follow the exact template msg_${state.id || "lore"}_${outputIndex}.
• 🟡 (15:42) The streaming implementation tracks principalEventEmitted, cancellation state, and keepaliveTimer; one resource-limit classification is "principal_resource_limit".
• 🟡 (15:42) Visible output placement uses visibleOutputSources with a binary-search comparison (visibleOutputSources[middle] ?? 0) < sourceIndex; stream-limit failures can throw SSEStreamLimitError.
• 🟡 (15:42) Recall continuation logic checks pendingRecalls.length === 0 before proceeding through the no-pending-recall path.