Allow add Tools by editor script.

[Seng-Jik]

Can I dynamically add the MCP Tool by writing an editor script, as follows:

#if UNITY_EDITOR

[MCPTool]
public class ExampleTool : MCPTool
{
    protected override string Name => "Tool Name...";
    protected override string Descrption => "Description...";
    protected override void Execute(JObject args) { ... }
}

#endif

This might be more usable for highly process-oriented business projects.

[msanatan]

That unfortunately won't work with how it's currently set up. You'll need to update both the Unity plugin and the MCP server itself, which is currently written in Python: https://github.com/CoplayDev/unity-mcp/tree/main/UnityMcpBridge/UnityMcpServer~/src/tools

I think for that to be possible we'd need some way to centralize the tool definition in C#, and have a way to update the tools on the server, and then expose that to users.

Some ways I imagine this can be done:

• Have a way for the plugin to publish a JSON tool schema, and have the server auto-register those tools.
  • Seems like the most feasible way
• Move MCP server to C#
  • Not a simple undertaking, the main library for this is good but a lot less mature and supported (https://github.com/modelcontextprotocol/csharp-sdk)
• Have a basic tool in the server called "discover_tools", and all it does it get the dynamically set tools from the Unity plugin. But this loses a lot of the type discovery and seems prone to lower accuracy via hallucinations

Not sure how high I'll rank this feature request in the priorities, though I do see it's utility. CC @dsarno @Scriptwonder

[msanatan]

Continued in #293