unity-mcp/Server
dsarno 39bff4ae27
Fix PlayMode tests stalling when unfocused (python refresh utility), improve domain reload recovery and refresh tool (#554)
* Fix test job state management after domain reload

- TestRunnerService.RunFinished: Always clean up job state even when
  _runCompletionSource is null (happens after PlayMode domain reload)
- TestJobManager: Detect and clear stale jobs (5+ min without updates)
  on startup to recover from stuck state after domain reload
- refresh_unity.py: Add "could not connect" to retryable errors when
  wait_for_ready=True, so connection failures during domain reload
  trigger waiting instead of immediate failure

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* Add focus nudge to handle OS-level throttling during PlayMode tests

When Unity is unfocused, macOS App Nap (and similar OS features) can
throttle the process, causing PlayMode tests to stall even with Unity
No Throttling mode enabled.

Changes:
- Add ApplyNoThrottlingPreemptive() to TestRunnerNoThrottle for early
  throttle prevention before PlayMode Execute()
- Add focus_nudge.py utility that temporarily focuses Unity and returns
  focus to the original app (supports macOS, Windows, Linux)
- Integrate focus nudge into get_test_job polling - when tests appear
  stalled (unfocused + no progress for 10s), automatically nudge Unity

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* Fix code review issues in focus_nudge.py

- Remove redundant time import (already imported at module level)
- Escape window titles in PowerShell script to prevent injection
- Remove unused Callable import

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* Improve focus nudge logging and fix skipped tests

- Improve logging in focus_nudge.py: rate limit skip and focus return at INFO level
- Improve logging in run_tests.py: show nudge completion status
- Fix path resolution in test_logging_stdout.py and test_transport_framing.py
- Add PlayMode tests to UnityMCPTests project for testing PlayMode runner

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* Add troubleshooting note about focus permission requests

When running PlayMode tests with Unity in the background, the focus
nudge feature may trigger OS permission prompts (especially on macOS
for accessibility/automation). Document this expected behavior.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
2026-01-14 15:02:40 -08:00
..
src Fix PlayMode tests stalling when unfocused (python refresh utility), improve domain reload recovery and refresh tool (#554) 2026-01-14 15:02:40 -08:00
tests Fix PlayMode tests stalling when unfocused (python refresh utility), improve domain reload recovery and refresh tool (#554) 2026-01-14 15:02:40 -08:00
DOCKER_OVERVIEW.md Publish to Docker Hub (#468) 2025-12-19 17:24:04 -04:00
Dockerfile HTTP Server, uvx, C# only custom tools (#375) 2025-11-24 23:21:06 -04:00
LICENSE Publish to pypi (#466) 2025-12-19 16:43:44 -04:00
README.md chore: bump version to 9.0.3 2026-01-08 16:01:52 +00:00
__init__.py Copy the MCP server to the top level (#354) 2025-10-25 00:53:53 -04:00
pyproject.toml feat: add test coverage tracking with pytest-cov (#512) 2026-01-08 17:32:44 -04:00
pyrightconfig.json Copy the MCP server to the top level (#354) 2025-10-25 00:53:53 -04:00
uv.lock feat: add test coverage tracking with pytest-cov (#512) 2026-01-08 17:32:44 -04:00

README.md

MCP for Unity Server

MCP python License Discord

Model Context Protocol server for Unity Editor integration. Control Unity through natural language using AI assistants like Claude, Cursor, and more.

Maintained by Coplay - This project is not affiliated with Unity Technologies.

💬 Join our community: Discord Server

Required: Install the Unity MCP Plugin to connect Unity Editor with this MCP server. You also need uvx (requires uv) to run the server.


Installation

Option 1: PyPI

Install and run directly from PyPI using uvx.

Run Server (HTTP):

uvx --from mcpforunityserver mcp-for-unity --transport http --http-url http://localhost:8080

MCP Client Configuration (HTTP):

{
  "mcpServers": {
    "UnityMCP": {
      "url": "http://localhost:8080/mcp"
    }
  }
}

MCP Client Configuration (stdio):

{
  "mcpServers": {
    "UnityMCP": {
      "command": "uvx",
      "args": [
        "--from",
        "mcpforunityserver",
        "mcp-for-unity",
        "--transport",
        "stdio"
      ]
    }
  }
}

Option 2: From GitHub Source

Use this to run the latest released version from the repository. Change the version to main to run the latest unreleased changes from the repository.

{
  "mcpServers": {
    "UnityMCP": {
      "command": "uvx",
      "args": [
        "--from",
        "git+https://github.com/CoplayDev/unity-mcp@v9.0.3#subdirectory=Server",
        "mcp-for-unity",
        "--transport",
        "stdio"
      ]
    }
  }
}

Option 3: Docker

Use Pre-built Image:

docker run -p 8080:8080 msanatan/mcp-for-unity-server:latest --transport http --http-url http://0.0.0.0:8080

Build Locally:

docker build -t unity-mcp-server .
docker run -p 8080:8080 unity-mcp-server --transport http --http-url http://0.0.0.0:8080

Configure your MCP client with "url": "http://localhost:8080/mcp".

Option 4: Local Development

For contributing or modifying the server code:

# Clone the repository
git clone https://github.com/CoplayDev/unity-mcp.git
cd unity-mcp/Server

# Run with uv
uv run src/main.py --transport stdio

Configuration

The server connects to Unity Editor automatically when both are running. No additional configuration needed.

Environment Variables:

  • DISABLE_TELEMETRY=true - Opt out of anonymous usage analytics
  • LOG_LEVEL=DEBUG - Enable detailed logging (default: INFO)

Example Prompts

Once connected, try these commands in your AI assistant:

  • "Create a 3D player controller with WASD movement"
  • "Add a rotating cube to the scene with a red material"
  • "Create a simple platformer level with obstacles"
  • "Generate a shader that creates a holographic effect"
  • "List all GameObjects in the current scene"

Documentation

For complete documentation, troubleshooting, and advanced usage:

📖 Full Documentation


Requirements

  • Python: 3.10 or newer
  • Unity Editor: 2021.3 LTS or newer
  • uv: Python package manager (Installation Guide)

License

MIT License - See LICENSE