Google gemini-3-api helper API response error

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AI-generated summary

Users are troubleshooting an error with the Google Gemini 3 API helper, specifically a missing thought_signature in function calls, which is required for tool functionality honeymoose. The issue was acknowledged as part of a complex protocol, especially with multiple tool calls sam. A fix has since been implemented and deployed, as confirmed by sam with a celebratory note and a link to the GitHub commit.

1

Try to test gemini-3-api.

Got error when try to use Helper.

{
“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:search , position 2. please refer to https://ai.google.dev/gemini-api/docs/thought-signatures for more details.”,
“status”: “INVALID_ARGUMENT”
}
}

Creative OK

4b92c5c24fec3938db0fba34d7ffc6396ff275f0
4b92c5c24fec3938db0fba34d7ffc6396ff275f01416×1155 78.6 KB

919a0179bc271708383b1189825395c3efc087bb
919a0179bc271708383b1189825395c3efc087bb1603×899 79.9 KB

Model URL for gemini - 3 is: https://generativelanguage.googleapis.com/v1beta/models/gemini-3-pro-preview

Any suggestion?

1 Like
2

@sam this is the equivalent of what you’ve been working on for OpenAI and Anthropic right?

3 Likes
3

Yeah it is a surprisingly complicated protocol, especially when multiple tool calls are involved.

I am working on it! Hopefully I will have this implemented this week.

Thinking objects now have “provider_data”, the new change is to allow ToolCall objects to ferry that around as well.

4 Likes
4

This is now fixed :confetti_ball:

https://github.com/discourse/discourse/commit/0e6482fcf4d2a10a27ee55af4701ed2c625cbfc4

3 Likes
5

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