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---
title: generative
sidebarTitle: generative
---
# `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())
## Classes
### `GenerativeUI` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/fastmcp_slim/fastmcp/apps/generative.py#L53" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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:**
#### `lifespan` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/fastmcp_slim/fastmcp/apps/generative.py#L196" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
```python
lifespan(self) -> AsyncIterator[None]
```