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141 lines
4.8 KiB
Text
141 lines
4.8 KiB
Text
---
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title: types
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sidebarTitle: types
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---
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# `fastmcp.utilities.types`
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Common types used across FastMCP.
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## Functions
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### `get_cached_typeadapter` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/utilities/types.py#L41" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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get_cached_typeadapter(cls: T) -> TypeAdapter[T]
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```
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TypeAdapters are heavy objects, and in an application context we'd typically
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create them once in a global scope and reuse them as often as possible.
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However, this isn't feasible for user-generated functions. Instead, we use a
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cache to minimize the cost of creating them as much as possible.
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### `issubclass_safe` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/utilities/types.py#L116" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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issubclass_safe(cls: type, base: type) -> bool
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```
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Check if cls is a subclass of base, even if cls is a type variable.
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### `is_class_member_of_type` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/utilities/types.py#L126" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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is_class_member_of_type(cls: Any, base: type) -> bool
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```
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Check if cls is a member of base, even if cls is a type variable.
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Base can be a type, a UnionType, or an Annotated type. Generic types are not
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considered members (e.g. T is not a member of list\[T]).
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### `find_kwarg_by_type` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/utilities/types.py#L148" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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find_kwarg_by_type(fn: Callable, kwarg_type: type) -> str | None
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```
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Find the name of the kwarg that is of type kwarg_type.
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Includes union types that contain the kwarg_type, as well as Annotated types.
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### `replace_type` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/utilities/types.py#L377" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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replace_type(type_, type_map: dict[type, type])
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```
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Given a (possibly generic, nested, or otherwise complex) type, replaces all
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instances of old_type with new_type.
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This is useful for transforming types when creating tools.
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**Args:**
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- `type_`: The type to replace instances of old_type with new_type.
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- `old_type`: The type to replace.
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- `new_type`: The type to replace old_type with.
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Examples:
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```python
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>>> replace_type(list[int | bool], {int: str})
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list[str | bool]
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>>> replace_type(list[list[int]], {int: str})
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list[list[str]]
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```
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## Classes
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### `FastMCPBaseModel` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/utilities/types.py#L34" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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Base model for FastMCP models.
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### `Image` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/utilities/types.py#L174" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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Helper class for returning images from tools.
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**Methods:**
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#### `to_image_content` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/utilities/types.py#L211" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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to_image_content(self, mime_type: str | None = None, annotations: Annotations | None = None) -> mcp.types.ImageContent
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```
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Convert to MCP ImageContent.
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### `Audio` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/utilities/types.py#L233" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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Helper class for returning audio from tools.
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**Methods:**
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#### `to_audio_content` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/utilities/types.py#L270" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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to_audio_content(self, mime_type: str | None = None, annotations: Annotations | None = None) -> mcp.types.AudioContent
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```
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### `File` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/utilities/types.py#L291" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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Helper class for returning audio from tools.
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**Methods:**
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#### `to_resource_content` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/utilities/types.py#L330" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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to_resource_content(self, mime_type: str | None = None, annotations: Annotations | None = None) -> mcp.types.EmbeddedResource
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```
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### `ContextSamplingFallbackProtocol` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/utilities/types.py#L414" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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