The save hook and precompact hook were telling the agent to write
diary entries, add drawers, and add KG triples IN THE CHAT WINDOW.
Every line written stays in conversation history and retransmits on
every subsequent turn — ~$1/session in wasted tokens.
Fix: hooks now say "saved in background, no action needed" and use
decision: allow instead of block. The agent continues working without
interruption. All filing happens via the background pipeline.
Also updated hooks README with:
- Known limitation: hooks require session restart after install
- Updated cost section: zero tokens, background-only
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
The save hook uses SESSION_ID in file paths (state_dir/).
A crafted session_id value like '../../etc/cron.d/evil' could write
state files outside the intended directory.
Strip everything except [a-zA-Z0-9_-] from SESSION_ID, defaulting
to 'unknown' if empty after sanitization.
Finding: #4 (HIGH — path traversal via SESSION_ID)
Includes test infrastructure from PR #131.
92 tests pass.
- hooks/mempal_save_hook.sh: pass $TRANSCRIPT_PATH as sys.argv
instead of interpolating into python -c string (fixes#110)
- normalize.py: accept type "user" in addition to "human" for
Claude Code JSONL sessions (fixes#111)
- convo_miner.py: skip tool-results/, memory/ dirs and .meta.json
files when scanning for conversations (fixes#111)
- pyproject.toml: pin chromadb>=0.4.0,<1 to avoid crashing 1.x
builds on macOS ARM64 (fixes#100)
MSL