Agent mode fails with Kimi K3: JSON Schema not supported

[pd2xts]

• Copilot Chat Extension Version: 0.60.0
• VS Code Version: 1.132.0
• OS Version: Mac Sequoia 15.6 (Darwin arm64 24.6.0)
• Feature (e.g. agent/edit/ask mode): Agent
• Selected model (e.g. GPT 4.1, Claude 3.7 Sonnet): Kimi K3

Steps to Reproduce:

1. Select Kimi K3 in Agent mode
2. Send a request

I see a message such as the following:

Sorry, your request failed. Please try again.

Client Request Id: ac75fb90-264c-4825-8bae-3f7d3d0c9549

GH Request Id: F09F:41513:A46EA2:C22E79:6A7D8317

Reason: Request Failed: 400 {"error":{"message":"JSON Schema not supported: could not understand the instance {'required': ['name']}.","code":"invalid_request_body"}}

I have no MCP Servers. Diagnosis suggests that the error doesn't come from MCP servers or my workspace, it's a platform compatibility issue between VS Code's Agent mode and the Kimi K3 model provider (Moonshot AI).

[vs-code-engineering]

Thanks for creating this issue! It looks like you may be using an old version of VS Code; the latest stable release is 1.133.0. Please try upgrading to the latest version and checking whether this issue remains.

Happy Coding!

[pd2xts]

I have upgraded to version 1.133.0.
Copilot Chat Extension is now version 0.61.0

The issue remains.

[vs-code-engineering]

This issue is a duplicate of #253136. Please refer to that issue for updates and discussions. Feel free to open a new issue if you think this is a different problem.