# Symbolic Canvas Auto Hook — Closure Report

## Goal
Add an opt-in `openclaw-mem-engine` auto hook that builds symbolic-canvas Mermaid/JSON observe receipts from agent-end events without mutating canonical memory or injecting prompt context.

## Implemented
- `extensions/openclaw-mem-engine/symbolicCanvasAuto.js`
  - bounded config resolver
  - user/assistant message trace adapter
  - disabled/failed/too-few skip receipts
  - writes `trace.json`, `canvas.json`, `canvas.mmd`
- `extensions/openclaw-mem-engine/index.ts`
  - `symbolicCanvas.autoBuild` config parse/resolve
  - disabled-by-default hook registration on `agent_end`
  - compact lifecycle receipt logging
- `extensions/openclaw-mem-engine/openclaw.plugin.json`
  - public config schema + UI hints
- Public docs/skills:
  - `docs/symbolic-canvas.md`
  - `extensions/openclaw-mem-engine/README.md`
  - `skills/symbolic-canvas.ops.md`

## Safety boundary
- No `memory_store` calls.
- No `MEMORY.md` writes.
- No prompt injection.
- No model calls.
- Rollback is config-only: set `symbolicCanvas.autoBuild.enabled=false`.

## Verifiers
- Node tests: `handoffs/receipts/2026-05-16_symbolic-canvas-auto-hook/node-tests.txt`
- Python symbolic-canvas tests: `handoffs/receipts/2026-05-16_symbolic-canvas-auto-hook/pytest-symbolic-canvas.txt`
- Dry-run live helper receipt: `handoffs/receipts/2026-05-16_symbolic-canvas-auto-hook/dry-run-receipt.json`
- Counterfactual skip receipts: `handoffs/receipts/2026-05-16_symbolic-canvas-auto-hook/counterfactual-receipts.json`
- TypeScript compiler probe: `handoffs/receipts/2026-05-16_symbolic-canvas-auto-hook/tsc-check.txt`

## TSC note
The repo has no clean standalone TypeScript compile surface for `index.ts`; the probe fails on pre-existing default-import / missing OpenClaw SDK typing / existing object-narrowing issues. It did not surface a symbolic-canvas syntax-specific failure. Runtime helper and schema behavior are covered by node tests and dry-run receipt.

## Topology impact
Changed only when `symbolicCanvas.autoBuild.enabled=true` is configured. Default remains disabled.
