MCP Server Extension for Unity

A plugin that extends the MCP Server built into JetBrains Rider. Adds tools for operating Unity Editor from any Coding Agents.

Features

• No per-project MCP server package required — no need to install an MCP server package into each Unity project.
• No agent configuration — if the MCP Server is already enabled in Rider, Coding Agents can use the tools immediately with no additional setup.
• No additional configuration required for cloned workspaces — if you clone a workspace with git workspace, claude --workspace, etc., you get tools that work without any additional configuration.
• Tools for Unity Editor — provides Run tests, Run method, Check compilation, and Play control.

Requirements

• JetBrains Rider 2025.3+

Provided Tools

Run Tests

The run_unity_tests tool runs tests on Unity Editor through Rider's test infrastructure. Recommend filtering by assemblyNames, categoryNames, groupNames, and testNames to narrow down the tests to the scope of changes.

Parameters

| Name | Required | Description | |-----------------|--------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | testMode | Required | EditMode or PlayMode (case insensitive). If the includePlatforms in the assembly definition file (.asmdef) contains Editor, it is an Edit Mode test; otherwise it is a Play Mode test. | | assemblyNames | Required | Names of test assemblies to run (without .dll extension, e.g. MyFeature.Tests). Specify the name property in the assembly definition file. | | categoryNames | Optional | Names of a category to include in the run. Any test or fixture runs that have a category matching the string. | | groupNames | Optional | Same as testNames, except that it allows for Regex. This is useful for running specific fixtures or namespaces. | | testNames | Optional | The full name of the tests to match the filter. This is usually in the format FixtureName.TestName. If the test has test arguments, then include them in parentheses. |

Response

| Field | Type | Description | |---------------------|---------|----------------------------------------------------------------| | success | boolean | true if all tests passed | | passCount | number | Number of passing tests | | failCount | number | Number of failing tests

... View full README on GitHub