pi-memorix

Pi extension that bridges Memorix memory hooks into Pi's session lifecycle.

Wires Memorix into Pi's session lifecycle for automatic memory capture and recall. File writes, commands, and session summaries are captured as observations automatically. With the MCP server configured, the LLM also loads previous session context and searches memories at the start of each conversation.

What it does

Pi event	Memorix hook	Behavior
session_start	SessionStart	Loads previous session context, injects it on the first turn
before_agent_start	UserPromptSubmit	Fetches memories relevant to the current prompt
tool_result	PostToolUse	Auto-captures write/edit/bash results as Memorix observations
session_before_compact	PreCompact	Saves context before /compact wipes the thread
session_shutdown	Stop	Stores a session summary when Pi exits

Also adds a /mem <query> command for quick memory search from within Pi.

Installation

1. Install Memorix:

npm install -g memorix

2. Install this extension:

pi install npm:pi-memorix

To try it without making it permanent: pi -e npm:pi-memorix

3. Wire the MCP server — required for memory recall (context injection at session start):

Add this entry to ~/.pi/agent/mcp.json under mcpServers:

"memorix": {
  "command": "memorix",
  "args": ["serve"],
  "directTools": true
}

Without this, auto-capture still works (PostToolUse, Stop) but the LLM has no tools to recall past memories. Skip this only if you want silent capture with no recall.

4. (Optional) Enable auto-install of the git hook so commit-time capture is set up automatically for every repo you open:

Create ~/.pi/agent/memorix.json:

{ "autoGitHook": true }

With this enabled, the extension installs the hook the first time you open a repo that doesn't have it yet. To install manually instead:

memorix git-hook   # run once per repo

Bootstrapping an existing repo

For repos with existing history, seed Memorix from past commits before the git hook takes over:

memorix ingest log             # last 10 commits
memorix ingest log --count 50  # go further back

Run once per repo. The git hook handles new commits from that point on.

Usage

Once installed, the extension runs automatically with every Pi session. Steps 3 and 4 are optional — the extension's lifecycle hooks work without them. The MCP server (step 3) adds the ability for the LLM to call memorix_search and memorix_store directly on top of the automatic capture.

The /mem command lets you search project memory without leaving Pi:

/mem how does auth work
/mem recent session context
/mem what changed in the API layer

Debug mode

MEMORIX_PI_DEBUG=1 pi

Logs all hook activity to stderr. To verify hooks are firing:

[memorix-pi] SessionStart: loaded 1234 chars
[memorix-pi] PostToolUse — memorix stored observation
[memorix-pi] Auto-installed git hook in /your/repo
[memorix-pi] Stop: session saved to memorix

To see what was stored after a session:

cd your-repo && memorix recent

Maintenance

# Health check — project identity, data, conflicts
memorix doctor

# Preview and remove low-quality auto-captured noise
memorix cleanup --dry
memorix cleanup --force

# Inspect what's expiring; archive old memories
memorix retention

# Project info and rules sync status
memorix status

Notes

• Memorix requires a .git directory in the project root to identify the project. Outside git repos, hooks are silently skipped.
• All Memorix failures are silent by default — Pi never crashes because of this extension.
• If memorix is not found on PATH, the extension disables itself after the first failed spawn.