server.py

import requests
from mcp.server.fastmcp import FastMCP

mcp = FastMCP("unity-ctl")

def post(tool_name, data=None):
    try:
        response = requests.post(f"http://localhost:6400/{tool_name}", json=data)
        return response.json()
    except requests.exceptions.ConnectionError:
        return {"success": False, "error": "Could not connect to Unity. Is the editor running?"}

def get(tool_name, data=None):
    try:
        response = requests.get(f"http://localhost:6400/{tool_name}", json=data)
        return response.json()
    except requests.exceptions.ConnectionError:
        return {"success": False, "error": "Could not connect to Unity. Is the editor running?"}
 

@mcp.tool()
def create_gameobject(name: str, x: float, y: float, components: list[str]=None):
    if components is None:
        components = []
    return post("create_gameobject", data = {
        "name": name,
        "x": x,
        "y": y,
        "components": components
    })

@mcp.tool()
def add_component(gameobject_name: str, component: str):
    return post("add_component", data = {
        "gameobject_name": gameobject_name, 
        "component": component 
    })

@mcp.tool()
def enter_playmode():
    return post("enter_playmode")

@mcp.tool()
def exit_playmode():
    return post("exit_playmode")

@mcp.tool()
def get_console_logs():
    return get("get_console_logs")

if __name__ == "__main__":
    mcp.run()