Error when using tool invocation on new Gemini API

[SimonGurney]

When scanning cacti with Gemini with toll invocations, the following error is present for every file.

2025-11-26 21:44:44,899 - saist - ERROR - [Error] File 'graph_image.php': status_code: 400, model_name: gemini-3-pro-preview, body: {
  "error": {
    "code": 400,
    "message": "Function call is missing a thought_signature in functionCall parts. This is required for tools to work correctly, and missing thought_signature may lead to degraded model performance. Additional data, function call `default_api:read_file_contents` , position 2. Please refer to https://ai.google.dev/gemini-api/docs/thought-signatures for more details.",
    "status": "INVALID_ARGUMENT"
  }
}

Not sure if this is a warning, or impacts scanning

[SimonGurney]

pydantic/pydantic-ai#2293

[Mockaj]

Same problem here