ra-h-os/docs/8_mcp.md

MCP Server

Connect Claude Code and other AI assistants to your knowledge base.

How it works: RA-OS includes an 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.

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Quick Start (Recommended)

The easiest way is using the npm package:

{
  "mcpServers": {
    "ra-h": {
      "command": "npx",
      "args": ["ra-h-mcp-server"]
    }
  }
}

Add this to your ~/.claude.json (Claude Code) or Claude Desktop settings.

Requirements:

• Node.js 18+ installed

That's it. The database is created automatically on first connection. No need to keep RA-OS running.

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Alternative: Local Development

If you're developing RA-OS and want to use the local server:

Standalone (No Web App Required)

{
  "mcpServers": {
    "ra-h": {
      "command": "node",
      "args": ["/path/to/ra-h_os/apps/mcp-server-standalone/index.js"]
    }
  }
}

First install dependencies:

cd apps/mcp-server-standalone
npm install

HTTP Transport (Web App Required)

If you want real-time UI updates when nodes are created:

1. Start RA-OS: npm run dev
2. Configure:

{
  "mcpServers": {
    "ra-h": {
      "url": "http://127.0.0.1:44145/mcp"
    }
  }
}

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Available Tools

Tool	Description
rah_get_context	Get graph overview — stats, hub nodes, dimensions, recent activity. Called first automatically.
rah_add_node	Create a new node (title/content/dimensions)
rah_search_nodes	Search existing nodes by keyword
rah_update_node	Update an existing node
rah_get_nodes	Get nodes by ID
rah_create_edge	Create relationship between nodes
rah_update_edge	Update an edge explanation
rah_query_edges	Query existing edges
rah_list_dimensions	List all dimensions
rah_create_dimension	Create a new dimension
rah_update_dimension	Update/rename dimension
rah_delete_dimension	Delete a dimension

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What to Expect

Once connected, the MCP server instructs Claude to:

1. Call rah_get_context first to understand your graph (hub nodes, dimensions, stats)
2. Proactively identify valuable information in conversations and offer to save it
3. Search before creating to avoid duplicates
4. Require edge explanations — every connection needs a reason

You don't need to ask Claude to use your knowledge base — it will offer when it spots something worth saving.

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Example Usage

Once connected, you can ask your AI assistant:

"What's in my knowledge graph?"
"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"

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Key Files

File	Purpose
apps/mcp-server-standalone/	Standalone server (direct SQLite, recommended)
apps/mcp-server/server.js	HTTP MCP server
apps/mcp-server/stdio-server.js	STDIO bridge to HTTP server

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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

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Troubleshooting

"Database not found"

The MCP server auto-creates the database on first connection (v1.1.0+). If you're on an older version, run RA-OS once to create it:

npm run dev

"Tools not showing" (npm package)

1. Make sure Node.js 18+ is installed: node --version
2. Try running manually: npx ra-h-mcp-server
3. Restart Claude Code

"Connection refused" (HTTP method)

1. Make sure RA-OS is running: npm run dev
2. Check the port: lsof -i :44145