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fastmcp.apps.generative

GenerativeUI — a Provider that adds LLM-generated UI capabilities. Registers tools and resources from prefab_ui.generative so that an LLM can write Prefab Python code, execute it in a sandbox, and render the result as a streaming interactive UI. Requires fastmcp[apps] (prefab-ui). Usage:: from fastmcp import FastMCP from fastmcp.apps.generative import GenerativeUI mcp = FastMCP(“My Server”) mcp.add_provider(GenerativeUI())

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Classes

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GenerativeUI

A Provider that adds generative UI capabilities to a server. Registers:
  • A generate_ui tool that accepts Prefab Python code, executes it in a Pyodide sandbox, and returns the rendered PrefabApp. Supports streaming via ontoolinputpartial.
  • A components tool that searches the Prefab component library.
  • The generative renderer resource with CSP for Pyodide CDN access.
Example:: from fastmcp import FastMCP from fastmcp.apps.generative import GenerativeUI mcp = FastMCP(“My Server”) mcp.add_provider(GenerativeUI()) Methods:

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lifespan 

lifespan(self) -> AsyncIterator[None]