Screaming Frog MCP (headless)

uv tool install screaming-frog-mcp

{
  "mcpServers": {
    "screaming-frog-mcp": {
      "command": "uv",
      "args": [
        "tool",
        "install",
        "screaming-frog-mcp"
      ]
    }
  }
}

Screaming Frog ships its own MCP server in version 24, and that one does more: screenshots, crawl comparison, an optional Node runtime. This is the deliberately smaller alternative, built for crawls nobody is watching. There is no script runner, no package installation and no filesystem write access, and an allowlist environment variable can restrict which domains an agent is permitted to crawl at all. The tool that earns its place is aggregate_crawl_data, which computes counts and group-by breakdowns inside the server, so answering how many pages return a 404 costs one number rather than a full CSV export read into context. It drives the Screaming Frog command line and its saved crawl database directly, so a licensed install is required.