@estebanforge/pi-agentmemory

Pi-native cross-session memory for Pi, backed by agent-memory.dev. The agent recalls past decisions, bugs, and preferences across sessions automatically, with no MCP server in the loop. This package is the client; it talks directly to the agentmemory REST API.

Requires the agentmemory server. This extension does not bundle the server. Install agent-memory.dev once (see Prerequisites); thereafter the extension starts it automatically when needed and reuses an already-running one. See Auto-start.

Prerequisites

Install and start the agentmemory server on your machine:

npm install -g @agentmemory/agentmemory
agentmemory

Or run it without installing: npx -y @agentmemory/agentmemory@latest.

By default the REST API listens on http://localhost:3111 (the web viewer is on http://localhost:3113). See the agent-memory.dev docs and the source on GitHub for auth, Docker, and configuration.

Install

pi install npm:@estebanforge/pi-agentmemory

Start (or restart) Pi in a project. On session start the extension health-checks the server and lights up the footer status.

What it does

Three tools, one command, and a recall/observe lifecycle wired into Pi hooks.

Tools

Tool	Description
memory_health	Check whether the agentmemory server is reachable and healthy
memory_search	Search memory for prior decisions, preferences, bugs, and workflows
memory_save	Save a durable fact, convention, or bug fix into memory

Command

Command	Description
/agentmemory	Show server health + flags, or toggle a flag (/agentmemory [toggle <flag>])

Hooks

Hook	What it does
session_start	Derives the session ID, health-checks the server, sets the footer status
before_agent_start	Fires a background smart-search for the prompt and appends tool guidance to the system prompt
context	Awaits the search results and injects them as a user message before the LLM call
agent_end	Observes the conversation turn back into agentmemory for future recall

How it works

The recall path is deferred to keep prompt latency low. On before_agent_start the extension kicks off a smart-search against agentmemory and returns immediately; the context hook then awaits the result and prepends it as a user message just before the LLM is called. After the turn, agent_end writes the exchange back to agentmemory as an observation, so later sessions can recall it.

No MCP server required. The extension talks directly to the agentmemory REST API (health, smart-search, remember, observe).

Auto-start

The extension brings the server up on demand so you rarely start it by hand. On session start, and whenever memory_search / memory_save run, it:

1. Health-checks GET /agentmemory/health. If healthy, do nothing.
2. If down, checks whether agentmemory is installed. If so, starts it (detached, so it outlives Pi). If not, falls back to npx -y @agentmemory/agentmemory@latest.
3. Polls health for up to ~20s (first run downloads its engine), then proceeds or reports a clear error.

Closing Pi leaves the server running; reopening Pi, or opening a second Pi at the same time, detects it via the health check and does not start it again. A single Pi process also starts it only once per outage, even if several memory tools fire while it is down.

Two flags control this (edit in pi config):

Flag	Default	Effect
agentmemory-autostart	true	Master switch. false disables auto-start entirely; the extension then only health-checks and reports if the server is down.
agentmemory-npx-fallback	true	If agentmemory is not on PATH, start it via npx. false starts only a globally-installed server and otherwise reports that it is not installed. Use this if npx is too slow for you.

Security note: npx -y @agentmemory/agentmemory@latest downloads and runs the latest published package (unpinned) on first use. This is the official no-install path, but it is remote code execution. Install the CLI globally or set agentmemory-npx-fallback=false if that is not acceptable in your environment.

Configuration

Set via environment variables:

Variable	Default	Purpose
AGENTMEMORY_URL	http://localhost:3111	agentmemory server base URL
AGENTMEMORY_SECRET	(none)	Bearer token for auth
AGENTMEMORY_REQUIRE_HTTPS	(none)	Set 1 to reject plaintext HTTP + secret on non-loopback hosts

Security

A plaintext bearer-auth guard (security.ts) watches for a secret sent over plain HTTP to a non-loopback host. It warns once by default, and throws if AGENTMEMORY_REQUIRE_HTTPS=1. Use HTTPS or an SSH tunnel when carrying a bearer token over the network.

Compatibility

• Pi (@earendil-works/pi-coding-agent), pi-tui, and typebox, as optional peer dependencies resolved by the Pi runtime.
• The agentmemory server (agent-memory.dev), default http://localhost:3111.

License

MIT