diff --git a/src/fastmcp/tools/tool.py b/src/fastmcp/tools/tool.py
index f9beaeea9..f556bafa7 100644
--- a/src/fastmcp/tools/tool.py
+++ b/src/fastmcp/tools/tool.py
@@ -36,7 +36,9 @@ class Tool(BaseModel):
 
     fn: Callable[..., Any]
     name: str = Field(description="Name of the tool")
-    description: str | None = Field(default=None, description="Description of what the tool does")
+    description: str | None = Field(
+        default=None, description="Description of what the tool does"
+    )
     parameters: dict[str, Any] = Field(description="JSON schema for tool parameters")
     tags: Annotated[set[str], BeforeValidator(_convert_set_defaults)] = Field(
         default_factory=set, description="Tags for the tool"