WebFetch MCP Server

A Model Context Protocol (MCP) server that fetches web pages, converts HTML to markdown, and uses Claude to answer questions about the content. Get AI-powered summaries and analysis of any web page from any MCP client.

View on mpak registry | Built by NimbleBrain

Install

Install with mpak:

mpak install @nimblebraininc/webfetch

Configuration

Get your API key from Anthropic Console, then configure:

mpak config set @nimblebraininc/webfetch anthropic_api_key YOUR_API_KEY

Claude Code

claude mcp add webfetch -- mpak run @nimblebraininc/webfetch

Claude Desktop

Add to your claude_desktop_config.json:

{
  "mcpServers": {
    "webfetch": {
      "command": "mpak",
      "args": ["run", "@nimblebraininc/webfetch"]
    }
  }
}

See the mpak registry page for full install options.

Tools

web_fetch

Fetch a web page and answer questions about its content. The page is fetched, converted to markdown, and sent to Claude Haiku for analysis.

Parameter	Type	Required	Description
url	string	Yes	URL to fetch. HTTP URLs are auto-upgraded to HTTPS.
prompt	string	Yes	Question or instruction about the page content.

Example call:

{
  "name": "web_fetch",
  "arguments": {
    "url": "https://example.com",
    "prompt": "What is this page about? Summarize the main points."
  }
}

Example response:

This page is the IANA example domain, reserved for use in documentation
and examples. It contains a simple heading and a paragraph explaining
that the domain is established for illustrative purposes.

Features:

• Automatic HTTP to HTTPS upgrade
• HTML cleaned and converted to markdown (strips scripts, styles, nav, headers, footers)
• 15-minute in-memory cache for repeated fetches of the same URL
• Cross-host redirect detection (returns redirect URL for you to follow)
• Content truncation for very large pages

Quick Start

Local Development

git clone https://github.com/NimbleBrainInc/mcp-webfetch.git
cd mcp-webfetch

# Install dependencies
uv sync

# Set API key
export ANTHROPIC_API_KEY=your-key-here

# Run the server (stdio mode)
uv run python -m mcp_webfetch.server

The server supports HTTP transport with:

• Health check: GET /health
• MCP endpoint: POST /mcp

Development

# Install with dev dependencies
uv sync --group dev

# Run all checks (format, lint, typecheck, unit tests)
make check

# Run unit tests
make test

# Run with coverage
make test-cov

About

WebFetch MCP Server is published on the mpak registry and built by NimbleBrain. mpak is an open registry for Model Context Protocol servers.

• mpak registry
• NimbleBrain
• MCP specification
• Discord community

License

MIT