Memory MCP Server

A lightweight MCP (Model Context Protocol) server for persistent agent memory using SQLite and Bun.

Features

• store_memory: Store key-value pairs with optional JSON metadata
• retrieve_memory: Retrieve a memory by its key
• list_memories: List all memories with optional limit
• delete_memory: Delete a memory by its key

Prerequisites

• Bun v1.3.9 or higher

Installation

bun install

Build

bun build src/index.ts --outdir=build --target=bun

Run

bun run src/index.ts

Or use the built version:

bun run build/index.js

Configuration

Environment Variables

• MEMORY_DB_PATH: Path to the SQLite database file (default: ./memory.db)

MCP Settings Integration

To use this MCP server with Roo Code or Claude Desktop, add the following configuration to your MCP settings file:

Roo Code (Windows): %APPDATA%\roo-code\settings\mcp_settings.json Claude Desktop (Windows): %APPDATA%\Claude\claude_desktop_config.json

{
  "mcpServers": {
    "memory": {
      "command": "bun",
      "args": ["/path/to/local-mcp/build/index.js"],
      "env": {
        "MEMORY_DB_PATH": "/path/to/local-mcp/memory.db"
      }
    }
  }
}

Replace /path/to/local-mcp with the absolute path to this directory.

Usage Examples

Once configured, you can use the memory tools in your MCP client:

Store a memory

store_memory with key="user_preference", value="dark_mode", metadata='{"category":"ui"}'

Retrieve a memory

retrieve_memory with key="user_preference"

List all memories

list_memories

List limited memories

list_memories with limit=10

Delete a memory

delete_memory with key="user_preference"

Project Structure

local-mcp/
├── src/
│   ├── db/
│   │   └── index.ts          # Database initialization and types
│   ├── tools/
│   │   ├── store-memory/     # Store memory tool
│   │   ├── retrieve-memory/  # Retrieve memory tool
│   │   ├── list-memories/    # List memories tool
│   │   └── delete-memory/    # Delete memory tool
│   └── index.ts              # Main server entry point
├── build/                    # Compiled output
├── memory.db                 # SQLite database (created automatically)
├── .env.example              # Environment variables template
├── package.json
├── tsconfig.json
└── README.md

Database Schema

CREATE TABLE memories (
  key TEXT PRIMARY KEY,
  value TEXT NOT NULL,
  metadata TEXT,
  created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
  updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);

License

MIT