Implement SEP-986: Tool name validation (#1655)

src/mcp/server/fastmcp/tools/base.py

@@ -11,6 +11,7 @@ from pydantic import BaseModel, Field
 from mcp.server.fastmcp.exceptions import ToolError
 from mcp.server.fastmcp.utilities.context_injection import find_context_parameter
 from mcp.server.fastmcp.utilities.func_metadata import FuncMetadata, func_metadata
+from mcp.shared.tool_name_validation import validate_and_warn_tool_name
 from mcp.types import Icon, ToolAnnotations
 
 if TYPE_CHECKING:
@@ -56,6 +57,8 @@ class Tool(BaseModel):
         """Create a Tool from a function."""
         func_name = name or fn.__name__
 
+        validate_and_warn_tool_name(func_name)
+
         if func_name == "<lambda>":
             raise ValueError("You must provide a name for lambda functions")