fastmcp/docs/python-sdk/fastmcp-types.mdx
2026-06-27 10:36:03 -04:00

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---
title: types
sidebarTitle: types
---
# `fastmcp.types`
Reusable type annotations for FastMCP tool parameters.
These types can be used in tool function signatures to influence how
parameters are presented in UIs (e.g. `fastmcp dev apps`) and
serialized in JSON Schema.
Example:
```python
from fastmcp import FastMCP
from fastmcp.types import Textarea
mcp = FastMCP("demo")
@mcp.tool()
def run_query(sql: Textarea) -> str:
...
```