Create a new editable GDevelop project JSON file and keep it open as a session.

Load a local .json GDevelop project into an isolated in-memory session.

Register an existing local image, model, audio, video, font, JSON, Spine atlas/skeleton, or JavaScript file in an open project.

Update editable project metadata, resolution, and frame-rate settings in memory.

Add or replace an MCP-managed inline JavaScript event on a GDevelop scene.

Add an editable 2D layer to a scene, for example a HUD layer.

Create or update an editable scene variable with a primitive, structure, or array value.

Create or update an editable project-wide variable with a primitive, structure, or array value.

Create an editable scene object with optional Sprite, Text, or Spine configuration, object variables, and behaviors.

Create an editable scene object group for authoring shared enemy, pickup, or platform events.

Place an editable initial instance of a scene object with optional instance variables.

Replace or append editable native GDevelop comments, groups, and standard events.

Inspect scenes, editable objects, behaviors, instances, variables, and event counts.

Export a persistent GDJS web build to a caller-selected local directory.

Serialize an open in-memory project back to its JSON file.

Compile a project with gd.Exporter, start a loopback HTTP server, and return its preview URL.

Return one preview session, or list all sessions when previewId is omitted.

Stop the loopback HTTP server and remove only this preview's temporary directory.

Stop previews for a project and release its C++/Wasm project handle.