Triage Memory Core summarize_sessions Token Exhaustion (n_ctx 4096 Error)

Architectural Paradox

While we successfully truncated payload extraction for DreamService.mjs native topological generation, the direct MCP boundary summarize_sessions continues to crash when long-running sessions exceed the strict 4096 context window of the local OpenAiCompatible MLX engine.

Error Signature: error executing cascade step: CORTEX_STEP_TYPE_MCP_TOOL: Tool Error: Session summarization failed. Message: OpenAiCompatible Status 400: {"error":"The number of tokens to keep from the initial prompt is greater than the context length (n_keep: 80566>= n_ctx: 4096). Try to load the model with a larger context length, or provide a shorter input."}

Telemetry Payload

• Origin Session ID: ce92f035-b064-457e-be12-aad58dcffb53
• Failed Tool: mcp_neo-mjs-memory-core_summarize_sessions

Final Resolution (Executed)

Rejected Initial Hypothesis: We specifically rejected the "Final 3 Tuples Truncation" mechanism for SessionService, as it would result in unacceptable architectural amnesia during summarization (negative ROI). The Map-Reduce logic was fundamentally sound and designed explicitly to preserve lossless memory.

Root Cause Analyzed: The 80k+ token explosion was tracked to add_memory schema trust boundaries. Autonomous LLM agents were occasionally serializing multi-kilobyte script mutations and injecting them into the toolsUsed array under the AddMemoryRequest schema. This bypassed the Map-Reduce content splitting, appending gigabytes of file dumps unconditionally into the preamble.

Architectural Fix:

1. SessionService.mjs was refactored with defensive programming: we strictly parse, cast, and aggressively truncate (to 50 chars) all variables feeding toolsUsed from the metadata before joining them into the prompt preamble.
2. We added comprehensive unit coverage mocking 50K payload bombs (SessionSummarization.spec.mjs) to validate defensive extraction.
3. openapi.yaml was re-authored to explicitly ban JSON payloads in the toolsUsed property, restricting agents to single-word identifiers.