Feedback source
JetBrains Marketplace
GitHub Copilot plugin version
1.5.65-243
JetBrains IDE and version
IntelliJ IDEA 2025.3.2
Platform
Microsoft Windows NT 10.0.26200.0 x64
Steps to reproduce
- Get a Gemini API key from Google AI Studio
- Open "Manage Models" on Copilot Chat sidebar.
- In the Gemini provider page, paste the Gemini key, then select Gemini models.
- Back to the Copilot Chat page, select Gemini 3 Flash Preview (others may have the same issue?) in Other Models category.
- Select Agent mode.
- Send any chat that can lead to the agent calls tools. (like "Read the file and explain" or "fix errors on this file")
Logs (optional)
No response
Expected behavior
The chat/agent can response and calls tools.
Actual behavior
After one tool call complete, the following error will be displayed:
Sorry, an error occurred while generating a response. Details: unhandled status from server: 400 [{ "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 ... Read more from logs. Request ID: {uuid}
Additional information
Thought Signatures | Gemini API
Feedback source
JetBrains Marketplace
GitHub Copilot plugin version
1.5.65-243
JetBrains IDE and version
IntelliJ IDEA 2025.3.2
Platform
Microsoft Windows NT 10.0.26200.0 x64
Steps to reproduce
Logs (optional)
No response
Expected behavior
The chat/agent can response and calls tools.
Actual behavior
After one tool call complete, the following error will be displayed:
Additional information
Thought Signatures | Gemini API