CrimsonEditorUtilities is an editor-only plugin (Type: Editor, LoadingPhase: PostEngineInit) - it ships nothing in cooked builds. It does two things. First, it contributes Crimson's Model Context Protocol (MCP) toolsets: behind a single master switch it exposes AI-callable toolsets (source, plugins, assets, tags) to agents like Claude Code and Cursor using UE 5.8's Toolset Registry. Second, it bundles two convenience toolbar helpers: a Save Game deleter and a Common Maps opener.
The MCP toolbar button itself ships in CrimsonCommon, not here. Everything it configures - the master switch, Epic's toolset plugins, toolset visibility - is suite-wide and read by every Crimson plugin's editor module, so it has to exist for projects that do not install this optional plugin.
Editor tool, no runtime API
You drive this plugin from the level-editor toolbar and Project Settings - the MCP tools are called by external AI agents, not from your game's Blueprint or C++. There is no gameplay API here, so the Blueprint / C++ toggle at the top of the window does not change these pages.
What's included
System
Key Types
Purpose
MCP master switch (CrimsonCommon)
UCrimsonMCPSettings
One project setting that enables or disables all Crimson MCP tooling suite-wide (off by default). Defined in CrimsonCommonEditor; this plugin's toolsets are gated on it like every other plugin's.
Toolbar dropdown that lists and deletes save files - grouped by slot when a plugin registers a file-group provider, and following that provider's configured directory rather than assuming Saved/SaveGames/
Common Maps
FCrimsonCommonMapsUtility
Toolbar dropdown that opens maps you configure, in one click. Toggle with bEnableCommonMaps
Crimson MCP ships disabled. Turn it on in Project Settings -> Crimson -> Crimson MCP (or from the MCP toolbar button's menu, which ships with CrimsonCommon) and restart the editor - see Quick Start. The Save Game deleter and Common Maps helpers work with no MCP setup.