Ref

npx ref-tools-mcp@latest

{
  "mcpServers": {
    "ref-tools-mcp": {
      "command": "npx",
      "args": [
        "ref-tools-mcp@latest"
      ]
    }
  }
}

Ref indexes public and private technical documentation and exposes two tools: one that finds the right page for a query and one that reads a URL back as markdown. The design goal is context economy — rather than letting a model crawl a documentation site and spend its window on navigation chrome, it receives the relevant passage. It runs as a hosted HTTP endpoint or locally through npx, and both paths need an API key from the service.