diff --git a/pydantic_ai_slim/pydantic_ai/toolsets/__init__.py b/pydantic_ai_slim/pydantic_ai/toolsets/__init__.py
index f3d3d362dc..1e7905b802 100644
--- a/pydantic_ai_slim/pydantic_ai/toolsets/__init__.py
+++ b/pydantic_ai_slim/pydantic_ai/toolsets/__init__.py
@@ -2,7 +2,7 @@
 from .combined import CombinedToolset
 from .deferred import DeferredToolset
 from .filtered import FilteredToolset
-from .function import FunctionToolset
+from .function import FunctionToolset, FunctionToolsetTool
 from .prefixed import PrefixedToolset
 from .prepared import PreparedToolset
 from .renamed import RenamedToolset
@@ -15,6 +15,7 @@
     'DeferredToolset',
     'FilteredToolset',
     'FunctionToolset',
+    'FunctionToolsetTool',
     'PrefixedToolset',
     'RenamedToolset',
     'PreparedToolset',
diff --git a/pydantic_ai_slim/pydantic_ai/toolsets/function.py b/pydantic_ai_slim/pydantic_ai/toolsets/function.py
index 63f44a1f0c..cb90b42f96 100644
--- a/pydantic_ai_slim/pydantic_ai/toolsets/function.py
+++ b/pydantic_ai_slim/pydantic_ai/toolsets/function.py
@@ -20,7 +20,7 @@
 
 
 @dataclass
-class _FunctionToolsetTool(ToolsetTool[AgentDepsT]):
+class FunctionToolsetTool(ToolsetTool[AgentDepsT]):
     """A tool definition for a function toolset tool that keeps track of the function to call."""
 
     call_func: Callable[[dict[str, Any], RunContext[AgentDepsT]], Awaitable[Any]]
@@ -222,7 +222,7 @@ async def get_tools(self, ctx: RunContext[AgentDepsT]) -> dict[str, ToolsetTool[
                 else:
                     raise UserError(f'Tool name conflicts with previously renamed tool: {new_name!r}.')
 
-            tools[new_name] = _FunctionToolsetTool(
+            tools[new_name] = FunctionToolsetTool(
                 toolset=self,
                 tool_def=tool_def,
                 max_retries=tool.max_retries if tool.max_retries is not None else self.max_retries,
@@ -234,5 +234,5 @@ async def get_tools(self, ctx: RunContext[AgentDepsT]) -> dict[str, ToolsetTool[
     async def call_tool(
         self, name: str, tool_args: dict[str, Any], ctx: RunContext[AgentDepsT], tool: ToolsetTool[AgentDepsT]
     ) -> Any:
-        assert isinstance(tool, _FunctionToolsetTool)
+        assert isinstance(tool, FunctionToolsetTool)
         return await tool.call_func(tool_args, ctx)