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` , position 13. please refer to https://ai.google.dev/gemini-api/docs/thought-signatures for more details.
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It looks like the error is happening because the function call you’re using doesn’t include a thought_signature, which is now required for Gemini tool/function calls.