mcp-docs-rag MCP Server

RAG (Retrieval-Augmented Generation) for documents in a local directory

This is a TypeScript-based MCP server that implements a RAG system for documents stored in a local directory. It allows users to query documents using LLMs with context from locally stored repositories and text files.

Features

Resources

• List and access documents via `docs://` URIs
• Documents can be Git repositories or text files
• Plain text mime type for content access

Tools

• `list_documents` - List all available documents in the DOCS_PATH directory
  • Returns a formatted list of all documents
  • Shows total number of available documents
• `rag_query` - Query documents using RAG
  • Takes document_id and query as parameters
  • Returns AI-generated responses with context from documents
• `add_git_repository` - Clone a Git repository to the docs directory with optional sparse checkout
  • Takes repository_url as parameter
  • Optional document_name parameter to customize the name of the document (use simple descriptive names without '-docs' suffix)
  • Optional subdirectory parameter for sparse checkout of specific directories
  • Automatically pulls latest changes if repository already exists
• `add_text_file` - Download a text file to the docs directory
  • Takes file_url as parameter
  • Uses wget to download file

Prompts

• `guide_documents_usage` - Guide on how to use documents and RAG functionality
  • Includes list of available documents
  • Provides usage hints for RAG functionality

Development

Install dependencies:

npm install

Build the server:

npm run build

For development with auto-rebuild:

npm run watch

Setup

This server requires a local directory for storing documents. By default, it uses `~/docs` but you can configure a different location with the `DOCS_PATH` environment variable.

Document Structure

The documents directory can contain:

• Git repositories (cloned directories)
• Plain text files (with .txt extension)

Each document is indexed separately using llama-index.ts with Google's Gemini embeddings.

API Keys

This server uses Google's Gemini API for document indexing and querying. You need to set your Gemini API key as an environment variable:

export GEMINI_API_KEY=your-api-key-here

You can obtain a Gemini API key from the Google AI Studio website. Add this key to your shell profile or include it in the environment configuration for Claude Desktop.

Installation

To use with Claude Desktop, add the server config:

On MacOS: `~/Library/Application Support/Claude/claude_desktop_config.json`

On Windows: `%APPDATA%/Claude/claude_desktop_config.json`

On Linux: `~/.config/Claude/claude_desktop_config.json`

{
  "mcpServers": {
    "docs-rag": {
      "command": "npx",
      "args": ["-y", "@kazuph/mcp-docs-rag"],
      "env": {
        "DOCS_PATH": "/Users/username/docs",
        "GEMINI_API_KEY": "your-api-key-here"
      }
    }
  }
}

Make sure to replace `/Users/username/docs` with the actual path to your documents directory.

Debugging

Since MCP servers communicate over stdio, debugging can be challenging. We recommend using the MCP Inspector, which is available as a package script:

npm run inspector

The Inspector will provide a URL to access debugging tools in your browser.

Usage

Once configured, you can use the server with Claude to:

1. Add documents:

Add a new document from GitHub: https://github.com/username/repository

or with a custom document name:

Add GitHub repository https://github.com/username/repository-name and name it 'framework'

or with sparse checkout of a specific directory:

Add only the 'src/components' directory from https://github.com/username/repository

or combine custom name and sparse checkout:

Add the 'examples/demo' directory from https://github.com/username/large-repo and name it 'demo-app'

or add a text file:

Add this text file: https://example.com/document.txt

2. Query documents:

What does the documentation say about X in the Y repository?

3. List available documents:

What documents do you have access to?

The server will automatically handle indexing of documents for efficient retrieval.