Bug Report: MiniMax Tool Call Compatibility Issue (Windows Only) #11091

Description

Description

When using OpenCode on Windows, the client fails to correctly parse and execute tool calls returned by a privately deployed MiniMax model (SGlang backend, HTTP connection). This issue does not occur on Linux clients.

Background

• MiniMax is deployed on-premises (private cloud, not SaaS), using SGlang as the backend engine.
• The OpenCode client communicates with MiniMax via HTTP (not HTTPS).
• MiniMax returns tool call information in a non-standard XML format embedded in the content field, e.g.:

{
  "message": {
    "content": "...<minimax:tool_call>\n<invoke name=\"list_dir\">\n<parameter name=\"path\">...</parameter>\n</invoke>\n</minimax:tool_call>"
  },
  "finish_reason": "stop"
}

• The OpenAI-compatible format expected by OpenCode is:

{
  "message": {
    "content": null,
    "tool_calls": [{
      "id": "call_abc123",
      "type": "function",
      "function": {
        "name": "list_dir",
        "arguments": "{\"path\": \"...\"}"
      }
    }]
  },
  "finish_reason": "tool_calls"
}

Problem Details

• Tool call info is embedded in content as XML, not in a tool_calls array.
• finish_reason is stop instead of tool_calls.
• function.arguments should be a JSON string, not an object or XML.
• This causes OpenCode on Windows to not trigger tool execution, while Linux clients work as expected.

Steps to Reproduce

1. Deploy MiniMax (SGlang backend) in a private environment, accessible via HTTP.
2. Connect OpenCode client (Windows) to the MiniMax endpoint.
3. Trigger a tool call (e.g., ask the model to list a directory).
4. Observe that the tool call is not executed automatically on Windows, but works on Linux.

Impact

• Windows OpenCode users cannot use tool call automation with MiniMax (SGlang) backend.
• Linux OpenCode users are not affected.
• This blocks cross-platform automation and workflow consistency.

Additional Technical Notes

• The issue is not related to network or authentication; only the response format is problematic.
• A Python/Go middleware can be used to convert MiniMax XML tool calls to OpenAI-compatible JSON (see internal doc for code).
• The bug is likely in the Windows OpenCode client’s tool call parsing logic.
• MiniMax is running in a secure, private network (not public cloud).

Expected Behavior

OpenCode should correctly parse and execute tool calls from MiniMax (SGlang backend) on all platforms (Windows and Linux), regardless of HTTP/HTTPS or deployment type.

Contact

For more details, test cases, or code samples, please contact the reporter.

Plugins

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OpenCode version

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Steps to reproduce

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Screenshot and/or share link

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Operating System

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Terminal

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