Tool parsing from OpenAI API dotnet package is different than what LM Studio expects

[LazZiya]

Which version of LM Studio?
Example: LM Studio 0.4.6

Which operating system?
Windows 11

What is the bug?
Tool parsing from OpenAI dotnet package is different than what LM Studio expects. When creating a response from dotnet app with OpenAI package it parse the tools as below:

"tools": [
    {
      "type": "function",
      "name": "say_hello",
      "description": "Says hello to someone",
      "parameters": null,
      "strict": false
    }
  ],

But in LM Studio Docs it seems that tools has different structure:

tools = [
    {
        "type": "function",
        "function": {
            "name": "say_hello",
            "description": "Says hello to someone",
            "parameters": null
        }
    }
]

Logs
Full LM Studio Developer logs:

Developer Logs
2026-03-15 15:46:59 [DEBUG]
 Received request: POST to /v1/responses with body  {
  "model": "gpt-oss-20b",
  "max_output_tokens": 500,
  "tools": [
    {
      "type": "function",
      "name": "say_hello",
      "description": "Says hello to someone",
      "parameters": null,
      "strict": false
    }
  ],
  "input": [
    {
      "type": "message",
      "role": "user",
      "content": [
        {
          "type": "input_text",
          "text": "hey bro"
        }
      ]
    },
    {
      "type": "message",
      "role": "developer",
      "content": [
        {
          "type": "input_text",
          "text": "You are a helpful assistant."
        }
      ]
    }
  ],
  "store": true,
  "instructions": "",
  "stream": true
}
2026-03-15 15:46:59 [ERROR]
 [Server Error]  {
  "error": {
    "message": "Invalid",
    "type": "invalid_request_error",
    "param": "tools.0.type",
    "code": "invalid_string"
  }
}

To Reproduce
Steps to reproduce the behavior:

1. Create a dotnet project
2. Install OpenAI dotnet package v2.9.1
3. Create a streaming Response with function calling as described at OpenAI docs
4. See error