Finish removing

src/fastmcp/server/openapi.py

@@ -122,7 +122,6 @@ class OpenAPITool(Tool):
         name: str,
         description: str,
         parameters: dict[str, Any],
-        is_async: bool = True,
         tags: set[str] = set(),
         timeout: float | None = None,
         annotations: ToolAnnotations | None = None,
@@ -133,7 +132,6 @@ class OpenAPITool(Tool):
             description=description,
             parameters=parameters,
             fn=self._execute_request,  # We'll use an instance method instead of a global function
-            is_async=is_async,
             context_kwarg="context",  # Default context keyword argument
             tags=tags,
             annotations=annotations,
@@ -550,7 +548,6 @@ class FastMCPOpenAPI(FastMCP):
             name=tool_name,
             description=enhanced_description,
             parameters=combined_schema,
-            is_async=True,
             tags=set(route.tags or []),
             timeout=self._timeout,
         )

src/fastmcp/tools/tool.py

@@ -40,7 +40,6 @@ class Tool(BaseModel):
     name: str = Field(description="Name of the tool")
     description: str = Field(description="Description of what the tool does")
     parameters: dict[str, Any] = Field(description="JSON schema for tool parameters")
-    is_async: bool = Field(description="Whether the tool is async")
     context_kwarg: str | None = Field(
         None, description="Name of the kwarg that should receive context"
     )
@@ -74,7 +73,6 @@ class Tool(BaseModel):
             raise ValueError("You must provide a name for lambda functions")
 
         func_doc = description or fn.__doc__ or ""
-        is_async = inspect.iscoroutinefunction(fn)
 
         if inspect.ismethod(fn) and hasattr(fn, "__func__"):
             sig = inspect.signature(fn.__func__)
@@ -96,7 +94,6 @@ class Tool(BaseModel):
             name=func_name,
             description=func_doc,
             parameters=schema,
-            is_async=is_async,
             context_kwarg=context_kwarg,
             tags=tags or set(),
             annotations=annotations,