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Accept callables in Tool.from_tool() (#3235)

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* Accept callables in Tool.from_tool()

* chore: Update SDK documentation

* Add end-to-end client test for decorated function transform

---------

Co-authored-by: marvin-context-protocol[bot] <225465937+marvin-context-protocol[bot]@users.noreply.github.com>
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Jeremiah Lowin 2026-02-19 11:31:13 -05:00 • committed by GitHub
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5 changed files with 105 additions and 9 deletions
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4
docs/python-sdk/fastmcp-tools-tool.mdx
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@ -106,10 +106,10 @@ Schedule this tool for background execution via docket.
#### `from_tool` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/tools/tool.py#L364" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
```python
from_tool(cls, tool: Tool) -> TransformedTool
from_tool(cls, tool: Tool | Callable[..., Any]) -> TransformedTool
```
#### `get_span_attributes` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/tools/tool.py#L395" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
#### `get_span_attributes` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/tools/tool.py#L412" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
```python
get_span_attributes(self) -> dict[str, Any]

8
docs/python-sdk/fastmcp-tools-tool_transform.mdx
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@ -62,7 +62,7 @@ y=2)` will call the parent tool with `x=1` and `y=2`.
- `RuntimeError`: If called outside a transformed tool context.
### `apply_transformations_to_tools` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/tools/tool_transform.py#L977" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
### `apply_transformations_to_tools` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/tools/tool_transform.py#L979" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
```python
apply_transformations_to_tools(tools: dict[str, Tool], transformations: dict[str, ToolTransformConfig]) -> dict[str, Tool]
@ -213,7 +213,7 @@ functions.
#### `from_tool` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/tools/tool_transform.py#L369" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
```python
from_tool(cls, tool: Tool, name: str | None = None, version: str | NotSetT | None = NotSet, title: str | NotSetT | None = NotSet, description: str | NotSetT | None = NotSet, tags: set[str] | None = None, transform_fn: Callable[..., Any] | None = None, transform_args: dict[str, ArgTransform] | None = None, annotations: ToolAnnotations | NotSetT | None = NotSet, output_schema: dict[str, Any] | NotSetT | None = NotSet, serializer: Callable[[Any], str] | NotSetT | None = NotSet, meta: dict[str, Any] | NotSetT | None = NotSet) -> TransformedTool
from_tool(cls, tool: Tool | Callable[..., Any], name: str | None = None, version: str | NotSetT | None = NotSet, title: str | NotSetT | None = NotSet, description: str | NotSetT | None = NotSet, tags: set[str] | None = None, transform_fn: Callable[..., Any] | None = None, transform_args: dict[str, ArgTransform] | None = None, annotations: ToolAnnotations | NotSetT | None = NotSet, output_schema: dict[str, Any] | NotSetT | None = NotSet, serializer: Callable[[Any], str] | NotSetT | None = NotSet, meta: dict[str, Any] | NotSetT | None = NotSet) -> TransformedTool
```
Create a transformed tool from a parent tool.
@ -293,7 +293,7 @@ async def custom_output(**kwargs) -> ToolResult:
```
### `ToolTransformConfig` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/tools/tool_transform.py#L923" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
### `ToolTransformConfig` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/tools/tool_transform.py#L925" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
Provides a way to transform a tool.
@ -301,7 +301,7 @@ Provides a way to transform a tool.
**Methods:**
#### `apply` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/tools/tool_transform.py#L956" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
#### `apply` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/tools/tool_transform.py#L958" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
```python
apply(self, tool: Tool) -> TransformedTool