DocsFetcher MCP Server

An MCP server that fetches package documentation from multiple language ecosystems for LLMs like Claude without requiring API keys.

Features

• Supports multiple programming languages (JavaScript, Python, Java, .NET, Ruby, PHP, Rust, Go, Swift)
• Fetches documentation for packages by name or URL
• Crawls documentation sites to extract comprehensive information
• Extracts README, API docs, code examples, and repository info
• Provides structured data for LLM summarization
• Includes specialized prompts for documentation analysis
• No API key required - works natively with Claude Desktop and Cursor IDE

Installation

Claude Desktop

1. Open Claude Desktop → Settings → Developer
2. Click “Edit Config” and add:

{
  "mcpServers": {
    "docsFetcher": {
      "command": "npx",
      "args": [
        "-y",
        "@smithery/cli@latest",
        "run",
        "@cdugo/mcp-get-docs",
        "--config",
        "'{}'"
      ]
    }
  }
}

Cursor IDE Configuration

1. Open Cursor IDE → Settings → MCP -> Add New MCP Servier
2. Add:

    Name: docsFetcher
    Command: npx -y @smithery/cli@latest run @cdugo/mcp-get-docs --config "{}"

Prerequisites

• Node.js 18 or later

Running Locally

git clone https://github.com/cdugo/package-documentation-mcp
cd package-documentation-mcp
npm install
npm run build

Once installed, you can run the server locally with:

# From the project root directory
npm start

For development with auto-restart on file changes:

npm run dev

The server will start on the default port (usually 3000). You should see output like:

 DocsFetcher MCP Server running!
 Ready to fetch documentation

To specify a custom port:

PORT=8080 npm start

Available Tools

1. fetch-url-docs: Fetch docs from a specific URL
2. fetch-package-docs: Fetch docs for a package with optional language specification
3. fetch-library-docs: Smart tool that works with either package name or URL
4. fetch-multilingual-docs: Fetch docs for a package across multiple language ecosystems

Available Prompts

1. summarize-library-docs: Create a comprehensive library summary
2. explain-dependency-error: Generate dependency error explanations

Example Queries

Basic Library Information

• “What is Express.js and how do I use it?”
• “Tell me about the React library”
• “How do I use requests in Python?”

Multi-language Support

• “Show me documentation for lodash in JavaScript”
• “Compare pandas in Python and data.table in R”

Using Tools

• “@fetch-package-docs with packageName=‘express’ and language=‘javascript’”
• “@fetch-package-docs with packageName=‘requests’ and language=‘python’”
• “@fetch-multilingual-docs with packageName=‘http’ and languages=[‘javascript’, ‘python’, ‘rust’]”

Using Prompts

• “@summarize-library-docs with libraryName=‘express’”
• “@explain-dependency-error with packageName=‘dotenv’”

Troubleshooting

Local Installation

• Server not showing up: Verify absolute path in configuration
• Connection errors: Restart Claude Desktop or Cursor IDE
• Fetch failures: Some packages may have non-standard documentation
• Language support: If a language isn’t working, try using the package’s direct URL

License

MIT