input schema: anyOf integer, string not handled correctly

[ilia-kats]

Inspector Version

• 0.17.2

Describe the bug I have a tool that accepts either an integer or a string for one of its parameters. I'm using FastMCP in Python, and the function signature looks something like this:

def my_tool(arg1: Annotated[FilePath, Field(description="...")], factor: Annotated[str | Annotated[int, Field(ge=1)], Field(description="...")]=1) -> ToolResult

The produced input schema looks fine:

"factor": {
            "anyOf": [
              {
                "type": "string"
              },
              {
                "minimum": 1,
                "type": "integer"
              }
            ],
            "default": 1,
            "description": "..."
          }

However, the input field shown in the inspector does not show the description and appears to only accept integers, if I input something that cannot be parsed as integer I get an error message JSON.parse: unexpected character at line 1 column 1 of the JSON data.

Environment (please complete the following information):

• OS: Linux
• Browser: Firefox