Distillation

Date: Sep 16, 2026

• 🔴 (19:41) User stated that sparse numeric identities “never need more address space than the” applicable bound in packages/gateway/src/stream/openai-responses.ts, and that index + 1 always changes the value.
• 🟡 (19:41) accumulateResponsesSSEStream() appears at packages/gateway/src/stream/openai-responses.ts:1873; nearby logic tracks active content indexes with activeContentIndexByItem, applies frame limits using opts.maxFrames ?? DEFAULT_MAX_SSE_FRAMES, rejects malformed input with Error("malformed Responses stream event"), processes content-part and function-call-argument lifecycle events, applies events through applyResponsesEvent(state, event, parsed), and handles terminal events plus unfinished-item checks.
• 🔴 (19:42) User specified: “Always feed the accumulator” in the Anthropic-to-Responses projection path in packages/gateway/src/stream/openai-responses.ts.
• 🔴 (19:42) User stated the gateway-injected recall tool_use “never leaks to the client”; true Responses pass-through is safe only when no recall tool_use can appear in the stream.
• 🟡 (19:42) packages/gateway/src/stream/openai-responses.ts includes a true Responses upstream-to-client pass-through streamer around line 2374, SSE formatting via formatResponsesEvent(), spec-compliant : keepalive comments, abort/cancellation handling that cancels the upstream reader, and a Responses projection path around line 2713 that reuses the Anthropic accumulator to construct a complete response lifecycle.
• 🟡 (19:42) The projection path configures maxTotalBytes: opts.strict ? 4 * 1024 * 1024 : undefined, tracks currentOutputIndex, creates message item IDs as msg_${respId}_${currentOutputIndex}, and emits lifecycle events including response.output_item.added and response.content_part.added.
• 🟡 (19:42) Search of packages/gateway/src/pipeline.ts identified recall-continuation logic including streamResponsesRecallAware() at line 7794, continuation validation with AnthropicSSEValidator, recall-aware accumulation, continued output_index numbering, terminal response.completed rebuilding, duplicate/invalid output_index checks, item_reference lifecycle validation, and overflow handling with Error("Responses output_index overflow").
• 🟡 (19:43) packages/gateway/src/pipeline.ts:353-399 imports recall components including createRecallDiagnostics, MAX_RECALL_EXECUTIONS, MAX_RECALL_SEARCH_ITEMS, RecallChainBudget, RecallContinuationFailure, reportRecallContinuationFailure, RECALL_GATEWAY_TOOL, RECALL_TOOL_NAME, executeRecall, findRecallToolUse, hasRecallToolUse, isUsableRecallContinuation, hasOtherToolUse, clientHasRecallTool, runRecallFollowUpStreaming, runRecallFollowUpJSON, runRecallFollowUpStreamAccumulated, buildRecallAnchor, parseRecallAnchor, buildAnchoredRecallMarker, and expandRecallMarkers.
• 🟡 (19:43) packages/gateway/src/pipeline.ts:218 imports from ./stream/openai-responses.