modelcontextprotocol
diff --git a/‎src/mcp/server/fastmcp/utilities/func_metadata.py
Copy file name to clipboardExpand all lines: src/mcp/server/fastmcp/utilities/func_metadata.py
+2-1Lines changed: 2 additions & 1 deletion b/‎src/mcp/server/fastmcp/utilities/func_metadata.py
Copy file name to clipboardExpand all lines: src/mcp/server/fastmcp/utilities/func_metadata.py
+2-1Lines changed: 2 additions & 1 deletion
@@ -104,9 +104,10 @@ def pre_parse_json(self, data: dict[str, Any]) -> dict[str, Any]:
                 try:
                     # Validate parsed value
                     TypeAdapter(_field_info.annotation).validate_python(pre_parsed)
-                    new_data[field_name] = pre_parsed
                 except ValidationError:
                     continue  # Parsed value is invalid - skip
+                
+                new_data[field_name] = pre_parsed
         assert new_data.keys() == data.keys()
         return new_data