A practical MCP server for Unreal Engine C++ developers whose main value is replacing expensive source reads and unreliable model memory with fast database lookups, sharply reducing hallucinated signatures, wrong #include paths, and deprecated API usage. Its own benchmarks show the MCP configuration beating Grep/Read-only and Read-only setups on questions about recent deprecations, exactly where model memory is weakest. It fits developers writing UE5 C++ in Claude Code, Cursor, or Windsurf, but it does not index third-party plugins or marketplace assets, is a third-party (non-Epic) project, and depends on a network download for its first run.
This is a Model Context Protocol (MCP) server that gives AI coding agents accurate Unreal Engine C++ API documentation. It answers queries from a version-specific SQLite database, returning exact function signatures, #include paths, class member lists, and deprecation warnings, so agents avoid inventing signatures, guessing wrong headers, or calling deprecated APIs. On first run it automatically downloads the database for the matching engine version into ~/.unreal-api-mcp/, then serves over stdio. No Unreal Engine installation is required. Coverage includes all Engine Runtime, Editor, and Developer modules plus built-in plugins (Enhanced Input, Gameplay Abilities, Common UI, Niagara, Chaos, and many more), with Blueprint graph internals indexed as well (158 UK2Node subclasses, UEdGraphSchema_K2, BlueprintGraph, KismetCompiler, GraphEditor). It does not cover third-party plugins or marketplace assets. Licensed under MIT, with commercial use requiring permission.
{
"mcpServers": {
"unreal-api": {
"command": "uvx",
"args": ["unreal-api-mcp"],
"env": {
"UNREAL_VERSION": "5.5"
}
}
}
}