Unreal API

Check your .uproject file's EngineAssociation field to find the exact UE version used by your project. You will pass this as the UNREAL_VERSION environment variable (e.g. '5.5' or '5.7'). Alternatively, set UNREAL_PROJECT_PATH to your project folder and the server auto-reads the version.

Install the package globally with pip, or skip installation entirely by using uvx in your MCP config which downloads and runs the package on demand.

pip install unreal-api-mcp

Add the unreal-api entry to your MCP config file. Set UNREAL_VERSION to match your project. On first run the server downloads the version-specific database to ~/.unreal-api-mcp/ automatically.

{
  "mcpServers": {
    "unreal-api": {
      "command": "uvx",
      "args": ["unreal-api-mcp"],
      "env": {
        "UNREAL_VERSION": "5.5"
      }
    }
  }
}

Instead of hardcoding a version, set UNREAL_PROJECT_PATH to your project root. The server reads the EngineAssociation field from your .uproject file to determine the correct database version automatically.

{
  "mcpServers": {
    "unreal-api": {
      "command": "uvx",
      "args": ["unreal-api-mcp"],
      "env": {
        "UNREAL_PROJECT_PATH": "/path/to/MyUnrealProject"
      }
    }
  }
}

To ensure the AI reaches for the tools proactively, add usage instructions to your project's CLAUDE.md (or equivalent context file). Without this, the AI may try to read source files instead of querying the MCP server.

## Unreal Engine API Lookup (unreal-api MCP)
Use the unreal-api MCP tools to verify UE C++ API usage.
- get_function_signature: verify parameters and return type before writing a call
- get_include_path: resolve the correct #include for any type
- get_class_reference: list all members of a class
- search_unreal_api: find APIs by keyword
- get_deprecation_warnings: check if an API is obsolete

Restart your MCP client and ask it to look up a well-known UE function. The server should return the exact signature without hallucinating parameters.