# Memory MCP
[](https://www.npmjs.com/package/@whenmoon-afk/memory-mcp)
[](https://opensource.org/licenses/MIT)
Local, persistent memory for Claude Desktop and MCP-compatible AI assistants.
> *Part of the [Substratia](https://substratia.io) memory infrastructure ecosystem.*
A lightweight MCP server that gives your AI durable, searchable memory — entirely on your machine. Built with TypeScript, SQLite + FTS5, and minimal dependencies.
## Quick Start
### Claude Desktop
Download `memory-mcp.mcpb` from [GitHub Releases](https://github.com/whenmoon-afk/claude-memory-mcp/releases) and double-click to install.
### Claude Code
```bash
claude plugin install github:whenmoon-afk/claude-memory-mcp
```
<details>
<summary><strong>Alternative: Manual JSON Config</strong></summary>
Add to your Claude Desktop config file:
**macOS**: `~/Library/Application Support/Claude/claude_desktop_config.json`
**Linux**: `~/.config/Claude/claude_desktop_config.json`
**Windows**: `%APPDATA%/Claude/claude_desktop_config.json`
```json
{
"mcpServers": {
"memory": {
"command": "npx",
"args": ["-y", "github:whenmoon-afk/claude-memory-mcp"]
}
}
}
```
Windows may need `"command": "cmd", "args": ["/c", "npx", "-y", "github:whenmoon-afk/claude-memory-mcp"]`
</details>
After installation, **restart Claude Desktop** (quit and reopen).
## Tools
| Tool | Description |
|------|-------------|
| `memory_store` | Store a memory with auto-summarization and entity extraction |
| `memory_recall` | Search memories with token-aware loading |
| `memory_forget` | Soft-delete a memory (preserves audit trail) |
## Features
- FTS5 full-text search (fast, no embeddings needed)
- Token budgeting for context-aware responses
- Automatic entity extraction and summarization
- Soft deletes with provenance tracking
- Hybrid relevance scoring (recency + importance + frequency)
## Environment Variables
| Variable | Default | Description |
|----------|---------|-------------|
| `MEMORY_DB_PATH` | Platform-specific | Database file location |
| `DEFAULT_TTL_DAYS` | `90` | Default memory expiration |
## Troubleshooting
### Tools not appearing in Claude Desktop?
1. Restart Claude Desktop completely (quit and reopen)
2. Verify config file syntax is valid JSON
3. Check that Node.js 18+ is installed: `node --version`
### "Connection closed" on Windows?
Windows requires either:
- The `cmd /c` wrapper method (see Windows config above), OR
- The full path to `npx.cmd` (e.g., `C:\Program Files\nodejs\npx.cmd`)
### Getting stale cached versions?
The `npx github:` method bypasses npm cache. Alternatively:
- Clear npm cache: `npm cache clean --force`
- Use global install for version control
### Slow startup with github: method?
First run requires downloading and installing dependencies (can take 30+ seconds). Subsequent runs are faster but still fetch from GitHub. For faster startup, use the global install method.
## Dependencies
- `@modelcontextprotocol/sdk` - MCP protocol implementation
- `better-sqlite3` - Fast native SQLite with FTS5
## Links
- **npm**: https://www.npmjs.com/package/@whenmoon-afk/memory-mcp
- **GitHub**: https://github.com/WhenMoon-afk/claude-memory-mcp
- **Issues**: https://github.com/WhenMoon-afk/claude-memory-mcp/issues
## Want Cloud Sync?
**[Substratia Pro](https://substratia.io)** (coming soon) adds:
- Cloud sync across all your devices
- Memory dashboard to view/edit what AI remembers
- Automatic backups and disaster recovery
- Team memory sharing
**[Join the waitlist](https://substratia.io)** to get early access.
## Related Projects
Part of the **Substratia** memory infrastructure ecosystem:
- **[momentum](https://github.com/WhenMoon-afk/momentum)** - Instant context recovery (<5ms) for Claude Code
- **[AgentForge](https://substratia.io/builder)** - Visual drag-and-drop agent config builder
- **[Substratia](https://substratia.io)** - Memory infrastructure for AI
## Support
- [GitHub Issues](https://github.com/WhenMoon-afk/claude-memory-mcp/issues) - Bug reports & feature requests
## Privacy Policy
**Local-only by default**: All memories are stored locally on your machine in `~/.memory-mcp/memory.db`. No data is sent anywhere unless you explicitly enable cloud sync.
**Cloud sync (optional)**: If you connect to Substratia Cloud, memories are synced to our servers. See our full privacy policy at https://substratia.io/privacy
**What we collect**:
- Local mode: Nothing. Zero telemetry.
- Cloud mode: Memory content you choose to sync, usage metrics for service improvement.
## Disclaimer
This project is provided as-is. It is actively maintained but may have breaking changes between minor versions.
## License
MIT
