unreal-api-mcp

MCP server that gives AI agents accurate Unreal Engine C++ API documentation. Saves tokens, context, and time — prevents hallucinated signatures, wrong #include paths, and deprecated API usage.

Works with Claude Code, Cursor, Windsurf, or any MCP-compatible AI tool. No Unreal Engine installation required. Check the supported versions. New versions are detected and built automatically every week.

Quick Start

Add to your MCP config (.mcp.json, mcp.json, or your tool's MCP settings), setting UNREAL_VERSION to match your project:

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

Set this to match your project's UE version. See supported versions for all available databases.

On first run the server downloads the correct database to ~/.unreal-api-mcp/. Patch versions (e.g. "5.7.3") fall back to the major.minor database (e.g. "5.7") if a patch-specific one isn't available.

How It Works

1. Version detection. The server figures out which UE version to serve:

Set one of these to match your project. Without either, the server defaults to UE 5.7.

2. Database download. If the database for that version isn't cached locally, it downloads from GitHub (one time). For patch versions, falls back to the major.minor database if needed. Also checks for updates on startup.

3. Serve. All tool calls query the version-specific SQLite database. Exact lookups return in <1ms, searches in <5ms.

Each version has its own database with the correct signatures, deprecation warnings, and member lists for that release.

Tools

Coverage

All Engine Runtime, Editor, Developer modules, plus built-in plugins (Enhanced Input, Gameplay Abilities, Common UI, Niagara, Chaos, and hundreds more).

Includes Blueprint graph internals: 158 UK2Node subclasses, UEdGraphSchema_K2, BlueprintGraph, KismetCompiler, and GraphEditor modules (1,120+ entries). If you're wri

... View full README on GitHub