New Feature: IncludeThoughts for Google Connector

[roldengarm]

---

name: IncludeThoughts for Google Connector
about: Add ability to get thoughts in response from Google Gemini models.

---

The official C# SDK for Google supports a parameter "IncludeThoughts" on the ThinkingConfig. Setting that to true, will return the thoughts in the response.

This parameter is missing in Microsoft.SemanticKernel.Connectors.Google.GeminiThinkingConfig

Additionally, I believe the response logic for (at least) streaming should be updated as well to indicate if a part is a thought or not. Right now, InnerContent is just a string, not a POCO object as I would expect.
See official docs here. It doesn't include C# in the docs, but it's definitely there.

[Cozmopolit]

Thought Signatures are mandatory for Gemini 3 Pro with Function Calling

We've tested Gemini-3-Pro-Preview with Semantic Kernel and encountered the exact issue described in this thread. When using function calling, the API returns a 400 Bad Request with the error:

"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."

According to Google's documentation, Thought Signatures are mandatory for Gemini 3 Pro when making function calls. Without this feature, Gemini 3 Pro cannot be used with Semantic Kernel for any function calling scenarios.

This is a blocking issue for production use of Gemini 3 Pro.