An editor plugin and an MCP server that let an AI agent, an MCP client or any HTTP client drive the Unreal Editor through 717 typed endpoints. Each reply reports what the editor holds after the call.
Browse all 717 endpoints →Author StateTrees with Subtree parameters and linked overrides, pause play when an actor’s StateTree enters a named state, run EQS queries in play, and write the Gameplay Ability System’s C++ classes. gameplay_recipe’s enemy AI can use a StateTree brain.
Add a client to a running play session, reconnect one, read what replicates for each client, and send an RPC from call_function with the side it ran on in the answer.
lint_blueprints finds replication mistakes, costly ticks and casts, and untidy graphs. Copy components and nodes between Blueprints, restructure a graph and read its exec order.
Make, check and render Movie Render Graphs layer by layer, with OCIO and multipart EXR, plus Sequencer constraints and markerless body motion capture from one camera.
Any call that would change more than 25 things shows the list first and writes nothing until that list is committed. A write whose reply timed out is never run twice.
With the free MifBlender add-on: modular kit pieces, rocks, plants and trees, LOD chains, collision hulls, and a game-ready pass that sends a whole kit to Unreal in one call.
Nothing between your agent and the editor guesses. Each hop does exactly what it was asked, or says why not.
Any MCP client, or anything that can send HTTP.
On your machine. A default session loads find_tools, mif_call and run_python, and reaches every endpoint on demand. A reply is the endpoint’s JSON, unchanged.
Inside the editor. The token, the write mode and every parameter are checked before anything changes.
127.0.0.1:8791The change is made, undoable wherever the editor allows it, then read back from the asset or actor. That reading is the reply.
A mismatch is an answer too. If the editor holds something other than what was asked, the response says so instead of reporting success.
717 in 92 categories, counted from the API reference.
The default mode, scratch, refuses saves, Play-In-Editor, cooks and console commands. Only a person raises it: it is not an endpoint, a console variable or a command.
The plugin answers 127.0.0.1 only and rejects every other caller in the handler. Each request carries your token.
An unknown or misspelled key is refused with the accepted keys and the likely correction. describe_endpoint says what any endpoint takes.
A write returns what the editor holds afterwards. A clamped value or a switched-on override flag gets its own field, and a refusal says what to do instead.
447 of the 717 endpoints write through editor transactions, and batch runs many operations as one.
Deleting assets, actors, nodes or variables, renaming, and writing DataTable rows need confirm: true. Bulk renames, moves and consolidations take dryRun: true to list exactly what they would change first.
Built in Unreal Engine 5.7 by 5662 typed MifBridge calls, filmed while it was built: create_material_instance ×6, spawn_many ×119, set_actor_transform ×4320.
Built in Unreal Engine 5.7 by 5628 typed MifBridge calls, filmed while it was built: create_material_instance ×6, create_landscape, spawn_many ×52, set_actor_transform ×3870.
Built in Unreal Engine 5.7 by 13513 typed MifBridge calls, filmed while it was built: create_material_instance ×16, spawn_many ×844, set_actor_transform ×11436.
Built in Unreal Engine 5.7 by 22308 typed MifBridge calls, filmed while it was built: create_material_instance ×16, spawn_many ×339, set_actor_transform ×20736.
Built in Unreal Engine 5.7 by 6636 typed MifBridge calls, filmed while it was built: create_material_instance ×7, spawn_many ×65, set_actor_transform ×5348.
Built in Unreal Engine 5.7 by 51771 typed MifBridge calls, filmed while it was built: create_material_instance ×8, spawn_many ×123, create_material, add_material_expression ×3.
Both licenses give the same rights. Personal is for individuals and studios up to US$100,000 in revenue a year, the same rule as on Fab.
One request a day at most, and nothing about you. The plugin asks mifshowcase.store, at most once every 24 hours, whether a newer version is out, and shows a notification when there is one; the request carries only the plugin’s and the engine’s version. Turn it off in Editor Preferences ▸ Plugins ▸ Mif Bridge, or with MIF_BRIDGE_NO_UPDATE_CHECK=1. Pressing Set up Claude Code also downloads the MCP server’s packages from PyPI, and from 1.2 a call that asks for a real place’s heights (import_landscape_heightmap with an elevation area) makes the MCP server download them from the public AWS Terrain Tiles dataset, sending only the tile coordinates. Otherwise the plugin and the MCP server talk only to each other, over loopback on your machine. More on the privacy page.
No. MifBridge is an editor module, so a packaged build leaves it out.
UE 5.3 to 5.8, each built and swept. The engine matrix shows the record for every version.
Yes, and it says what cooking removed instead of returning an empty answer. Packages, material parameters, the class hierarchy and project structure can all be read: see Cooked projects.
Any MCP client can use the MCP server, and anything that sends HTTP can call the plugin directly. With Claude Code installed, SETUP ▸ Set up Claude Code in the editor connects it in one press, and there is a step-by-step guide for installing it with Claude.
Not on its own. Saves, cooks and console commands need the full write mode, which only a person can set, and deletions need confirm: true.
The endpoint counts come from the plugin’s own registrations, and every engine version has a sweep behind it. See how each was established.
Open verification →