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ra-h-os/docs/8_mcp.md
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“BeeRad”andClaude Opus 4.5 f383d770ca docs: update documentation for RA-H Light
- Rewrite 0_overview.md for 2-panel UI + MCP focus
- Delete 1_architecture.md (agent hierarchy no longer applies)
- Delete 3_context-and-memory.md (agent context no longer applies)
- Rewrite 4_tools-and-workflows.md for MCP tools only
- Rewrite 6_ui.md for 2-panel layout
- Delete 7_voice.md (voice removed)
- Update 8_mcp.md with correct tool list (11 tools)
- Rewrite 9_open-source.md for RA-H Light
- Update README.md with new doc structure

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
2026-01-29 16:06:54 +11:00

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# MCP Server
> How to connect Claude Code and other AI assistants to your knowledge base.
**How it works:** RA-H Light runs a local MCP (Model Context Protocol) server. This lets any MCP-compatible assistant — like Claude Code — search your notes, add new knowledge, and manage your knowledge graph. Everything stays local; nothing goes to the cloud.
---
## Quick Start
1. Start RA-H Light: `npm run dev`
2. Configure your AI assistant (see below)
3. Use naturally: "Search RA-H for my notes on X" or "Add this to RA-H"
---
## Available Tools
| Tool | Description |
|------|-------------|
| `rah_add_node` | Create a new node (title/content/dimensions) |
| `rah_search_nodes` | Search existing nodes |
| `rah_update_node` | Update an existing node |
| `rah_get_nodes` | Get nodes by ID |
| `rah_create_edge` | Create relationship between nodes |
| `rah_query_edges` | Query existing edges |
| `rah_update_edge` | Update edge metadata |
| `rah_create_dimension` | Create a new dimension |
| `rah_update_dimension` | Update dimension description |
| `rah_delete_dimension` | Delete a dimension |
| `rah_search_embeddings` | Semantic search across embeddings |
---
## Claude Code Configuration
Add to your `~/.claude.json` or Claude Code settings:
```json
{
"mcpServers": {
"ra-h": {
"command": "node",
"args": ["/path/to/ra-h_os/apps/mcp-server/stdio-server.js"]
}
}
}
```
Replace `/path/to/ra-h_os` with the actual path to your RA-H Light installation.
**Note:** RA-H Light must be running (`npm run dev`) for the MCP server to work.
---
## HTTP Transport
For assistants that support HTTP transport:
**URL:** `http://127.0.0.1:44145/mcp`
```json
{
"mcpServers": {
"ra-h": {
"url": "http://127.0.0.1:44145/mcp"
}
}
}
```
To start the HTTP server standalone:
```bash
node apps/mcp-server/server.js
```
---
## Example Usage
Once connected, you can ask your AI assistant:
```
"Search RA-H for what I wrote about product strategy"
"Add this conversation summary to RA-H as a new node"
"Find all nodes with the 'research' dimension"
"Create an edge between node 123 and node 456"
"What are my most connected nodes?"
```
---
## Security
- The MCP server only binds to `127.0.0.1` — localhost only
- No authentication required (local access only)
- All data persisted to `~/Library/Application Support/RA-H/db/rah.sqlite`
---
## Health Check
```bash
curl http://127.0.0.1:44145/status
```
---
## Key Files
| File | Purpose |
|------|---------|
| `apps/mcp-server/server.js` | HTTP MCP server |
| `apps/mcp-server/stdio-server.js` | STDIO MCP server (for Claude Code) |
---
## Troubleshooting
### "Connection refused"
1. Make sure RA-H Light is running: `npm run dev`
2. Check the port isn't blocked: `lsof -i :44145`
3. Verify the server started: check terminal output
### "Tools not showing"
1. Restart your AI assistant after configuring
2. Verify the path in your config is correct
3. Check `node apps/mcp-server/stdio-server.js` runs without errors
### "Permission denied"
1. Make sure the stdio-server.js file is readable
2. Check Node.js is in your PATH