lm-studio (beta) is missing a parameter from the tool schema

[oderwat]

To make lm-studio (current beta) work as a backend with my setup I had to modify the code:

from mcp import Tool
from lmos_openai_types import ChatCompletionTool

def mcp2openai(mcp_tool: Tool) -> ChatCompletionTool:
    """Convert a MCP Tool to an OpenAI ChatCompletionTool."""
    # Start with the input schema or default to empty object schema
    parameters = mcp_tool.inputSchema.copy() if mcp_tool.inputSchema else {"type": "object"}
    
    # Ensure OpenAI compatibility for object types
    if parameters.get("type") == "object":
        if "properties" not in parameters:
            parameters["properties"] = {}
        # Optionally ensure 'required' field exists as empty array if not present
        if "required" not in parameters:
            parameters["required"] = []
    
    return ChatCompletionTool(
        type="function",
        function={
            "name": mcp_tool.name,
            "description": mcp_tool.description,
            "parameters": parameters,
            "strict": False,
        },
    )