Agents SDK ImageGenerationTool, tool_config documentation

Does anyone know all accepted parameters for the tool_config, in the ImageGenerationTool 2? I can run the example found in Github 1, but if I for example try

tools=[
    ImageGenerationTool(
        tool_config={"type": "image_generation",
                     "quality": "low",
                     "style": "comic book"},
    )

I get unknown parameter error.

The tool config documentation says

"""The tool config, which image generation settings."""

Am I missing something obvious here?