Frontend Model Context Protocol

Example Use Cases

• 1

  Local state access without syncing data to a backend first

• 2

  Interact with UI elements like highlighted text or form inputs

• 3

  Expose frontend functions that call authenticated backend endpoints using the current user's browser session

Description

FrontendMCP extends the Model Context Protocol to browser environments by providing a relay and transport layer that allows MCP servers to run in client-side applications. It enables exposing client-only capabilities such as local state, browser APIs, and UI logic to backend LLMs and MCP clients. The project includes prehosted relay servers and reference implementations for self-hosting, facilitating seamless integration between frontend and backend MCP clients.