PMB (Personal Memory Brain) | Local first memory layer

What is PMB?

PMB (Personal Memory Brain) is a local-first persistent memory layer for AI coding agents over the Model Context Protocol. It provides Claude Code, Cursor, Codex, and other MCP-aware agents with a shared, durable memory of project decisions, lessons, facts, and goals that persists across sessions, stored entirely in a single SQLite file on your machine.

How to use PMB?

Install the package via pip (pip install pmb-ai), then connect it to your agent with a command like pmb connect claude-code. PMB works out of the box with Claude Code, Cursor, Codex, Windsurf, Zed, VS Code, and other MCP-compatible tools.

Key features of PMB

• 100% local — no cloud, no API keys, no telemetry
• Hybrid retrieval using BM25, vector search, and entity graph
• Achieves 94.5% evidence-recall@10 on the LoCoMo benchmark
• Persistent memory across all coding sessions
• Compatible with multiple MCP-aware agents

Use cases of PMB

• Retaining project decisions and rationale between coding sessions
• Storing lessons learned and domain facts for consistent agent behavior
• Enabling multiple AI agents to share and update the same project memory
• Building a durable, searchable knowledge base for long-running development workflows

FAQ from PMB

Where is my data stored?

All memory is kept in a single SQLite file on your local machine. No data is sent to the cloud or any third party.

What agents does PMB work with?

PMB is designed for any MCP-aware agent, including Claude Code, Cursor, Codex, Windsurf, Zed, and VS Code.

Do I need an API key or internet connection?

No. PMB requires no API keys, no cloud services, and no internet connectivity. It is entirely local.

How do I install PMB?

Install the Python package with pip install pmb-ai, then run pmb connect <agent-name> (e.g., pmb connect claude-code) to link it to your agent.

What license is PMB released under?

PMB is released under the Apache-2.0 license.