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.
Strongest · Documentation 13/20 Weakest · Reliability 8/20
Static review · not runListed 2026-09-10
Read the FMRS scoring method →Runtime：Python 3.10+
UNREAL_VERSION
Unreal Engine version to serve, e.g. 5.5 or 5.7.3; set it yourself. Defaults to 5.7 if unset (or auto-detected via UNREAL_PROJECT_PATH).
UNREAL_PROJECT_PATH
Path to your local Unreal project; the server reads the .uproject EngineAssociation field to auto-detect the version.
UNREAL_INSTALL_PATH
Overrides the UE install path only when building a database locally with ingest (e.g. H:/UE_5.6); not needed for normal operation.
{
"mcpServers": {
"unreal-api": {
"command": "uvx",
"args": ["unreal-api-mcp"],
"env": {
"UNREAL_VERSION": "5.5"
}
}
}
}
Shown for Claude Code. Other clients may use a different file or key (VS Code uses "servers") — the configurator below converts it.
{
"servers": {
"unreal-api": {
"command": "uvx",
"args": [
"unreal-api-mcp"
],
"env": {
"UNREAL_VERSION": "5.5"
}
}
}
}
Goes in your project's .vscode/mcp.json (VS Code uses a "servers" key).
claude mcp add unreal-api -e UNREAL_VERSION=5.5 -- uvx unreal-api-mcp
Run it in a terminal; replace any <…> placeholders with your own values first.
After starting, confirm the five tools (search_unreal_api, get_function_signature, get_include_path, get_class_reference, get_deprecation_warnings) appear in your client's tool list, or call get_function_signature("AActor::GetActorLocation") to prove the database downloaded and queries work. stderr should show unreal-api-mcp: serving UE <version>.
Once connected, you can ask your AI assistant things like:
No matching tools
Listed from the project's documentation, not tested by this site.
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.
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Source revision 9a910797582a Data synced 2026-10-19 Read the FMRS scoring method