2nd/10_Wiki/Topics/2026-05-02_second-brain-trace-mode_implementation.md

id, category, confidence_score, tags, last_reinforced

id	category	confidence_score	tags	last_reinforced
P-REINFORCE-WIKI-18722064	Unified	0.95	architecture-principles	2026-05-02

Development Log: Second Brain Trace Mode

Purpose

Make Second Brain usage visible and testable in AI answers.

Implementation Summary

• Added src/features/secondBrainTrace.ts.
• Added trace scoring over active Second Brain Markdown files.
• Added user-facing trace Markdown with usage status, referenced documents, unused documents, and grounding metrics.
• Added debug JSON output when debug mode is enabled.
• Added Trace and Dbg sidebar buttons.
• Connected trace context into AgentExecutor.
• Added tests for retrieval, rendering, debug JSON, and no-use cases.

Changed Files

• src/features/secondBrainTrace.ts
• src/agent.ts
• src/sidebarProvider.ts
• tests/secondBrainTrace.test.ts
• docs/records/ConnectAI/planning/2026-05-02_second-brain-trace-mode.md
• docs/records/ConnectAI/development/2026-05-02_second-brain-trace-mode_implementation.md

Verification

• ./node_modules/.bin/tsc --noEmit
• npm run compile
• ./node_modules/.bin/jest --runInBand

Result

When Trace mode is on, answers can now include:

• 2nd Brain usage status
• Reason for use or non-use
• Referenced note paths and excerpts
• Searched but unused notes
• Retrieval and grounding metrics
• Optional debug JSON