---
name: uefn-mcp
description: Use UEFN's current Unreal MCP toolsets safely and efficiently. Use whenever an agent needs to inspect or modify the UEFN editor, Scene Graph, Creative devices, Verse, compilation, or play-session state.
---

# UEFN MCP

Treat the live MCP server as the source of truth for available tools.

## Tool-search loop

1. Discover/list toolsets.
2. Identify the smallest relevant toolset.
3. Describe that toolset to obtain current schemas.
4. Dispatch the required operation.
5. Require explicit success before continuing.
6. Repeat only as needed.

Do **not** preload or memorize hundreds of leaf tools.

## Critical execution rule

Call Unreal MCP operations **serially**.
Do not issue overlapping calls.
The editor executes tool invocations on the game thread.

## Change rule

Prefer small, reviewable editor operations.
Do not batch a giant island rewrite into one opaque call.

## Coordinates

Do not assume transform conventions.
Read the current tool schema and inspect nearby existing transforms before writing coordinates.

For recovery, see [references/recovery.md](references/recovery.md).