PlayCanvas Editor MCP Server

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An MCP server for automating the PlayCanvas Editor with an LLM. The MCP client is built into the Editor — no browser extension needed. Install the server into your MCP client of choice (Claude Code, Codex, Claude Desktop, Cursor, …) and connect the Editor to it.

Installation

Requires Node.js 22.18+. The server is published to npm as @playcanvas/editor-mcp-server — a self-contained, zero-dependency bundle — so every client below runs it with npx. Nothing to clone or build.

Claude Code

claude mcp add playcanvas -- npx -y @playcanvas/editor-mcp-server

To share the server with everyone working on a repo, commit a .mcp.json to the project root instead:

{
  "mcpServers": {
    "playcanvas": {
      "command": "npx",
      "args": ["-y", "@playcanvas/editor-mcp-server"]
    }
  }
}

Codex

The Codex CLI and the Codex app share ~/.codex/config.toml, so one command covers both:

codex mcp add playcanvas -- npx -y @playcanvas/editor-mcp-server

[!NOTE] On Windows, use codex mcp add playcanvas -- cmd /c npx -y @playcanvas/editor-mcp-server. If the server times out on first run (while npx downloads the package), raise startup_timeout_sec under [mcp_servers.playcanvas] in ~/.codex/config.toml. ChatGPT itself only supports remote MCP connectors, so Codex is the OpenAI surface to use.

Claude Desktop

Go to Claude > Settings > Developer > Edit Config and add to claude_desktop_config.json:

{
  "mcpServers": {
    "playcanvas": {
      "command": "npx",
      "args": ["-y", "@playcanvas/editor-mcp-server"]
    }
  }
}

[!NOTE] On Windows, use "command": "cmd" and "args": ["/c", "npx", "-y", "@playcanvas/editor-mcp-server"].

Cursor

Select File > Preferences > Cursor Settings > MCP > Add new global MCP server and add the same JSON as for Claude Desktop.

Custom Port

The server listens for the Editor on WebSocket port 52000 by default. To change it, append --port <number> to the npx args and set the same port in the Editor's MCP popover.

Connecting the Editor

1. Open your project in the PlayCanvas Editor.
2. Click the MCP button at the bottom of the toolbar (below the Publish button).
3. Check that the port matches your MCP config (default 52000) and click CONNECT.

You can now issue commands from your MCP client.

[!NOTE] Only one Editor instance can be connected to the MCP server at a time.

[!IMPORTANT] Chromium gates a public page's connection to 127.0.0.1 behind a local access permission (Chrome 142+, extended to WebSockets in Chrome 147) granted per origin, so allow it when prompted. In Chrome's site settings it is Apps on device (loopback) — Local network covers LAN addresses and is not required. Only the Editor needs it: the launch page is bridged through the Editor rather than opening a socket of its own. If the Editor sits on Connecting, open its site settings and allow it — a blocked connection fails silently and looks exactly like a server that isn't running.

Editor Driver Coverage

All tools act on the project open in the connected Editor. The server does not discover, select, create, delete, transfer, or administer projects, and project IDs are not tool inputs.

Category	Driver coverage	Tools
Entity	Exact reads, filtered lists, resolution, search, script lookup, creation, schema-safe batch edits, duplication, hierarchy changes, deletion and component lifecycle	list_entities, get_entity, resolve_entities, search_entities, find_entities_by_script, create_entities, modify_entities, duplicate_entities, reparent_entity, delete_entities, add_components, remove_components
Scripts	Asset text reads and writes, parsing, attachment, attributes, ordering and removal	get_asset_text, set_asset_text, set_script_text, script_parse, add_script_component_script, attach_script, add_entity_scripts, remove_entity_scripts, move_entity_script
Assets	Exact reads, reference graphs, native creation, streamed upload and atomic download up to 512 MiB, schema-safe edits, moves, duplication, source replacement, reimport, deletion and materials	list_assets, get_asset, get_asset_references, create_assets, upload_assets, modify_assets, move_assets, duplicate_assets, replace_asset, reimport_assets, download_asset, delete_assets, set_material_diffuse, set_material_properties
Templates	Instantiation and instance override inspection, application, reversion and unlinking	instantiate_template_assets, get_template_overrides, apply_template_overrides, revert_template_overrides, unlink_template_instances
Animation	Animation state graph reads and edits, mapping-safe state renames and animation events	get_anim_state_graph, modify_anim_state_graph, get_animation_events, modify_animation_events
Processing	Lightmaps, model unwrap and cancellation, texture conversion, atlases, cubemaps, fonts, metadata, compressed variants, prefiltering, sprites and bundles	bake_lightmaps, unwrap_model_asset, cancel_model_unwrap, convert_texture_asset, create_texture_atlas, create_cubemap_from_texture, process_font_asset, generate_texture_metadata, process_texture_variants, prefilter_cubemap, clear_cubemap_prefilter, modify_sprite_asset, modify_bundle_asset
Scene	Exact reads, listing, loading, creation, duplication, rename, deletion and scene settings	list_scenes, get_scene, load_scene, create_scene, duplicate_scene, rename_scene, delete_scene, query_scene_settings, modify_scene_settings
Settings	Scoped project, private, user, session and scene settings reads and edits	query_settings, modify_settings, query_project_settings, modify_project_settings
Viewport	Camera and viewport state, visibility, capture and focus	query_viewport_state, set_viewport_state, query_viewport_visibility, set_viewport_visibility, capture_viewport, focus_viewport, focus_camera
Editor	Selection, edit-time logs, transform gizmo state, undo and redo	get_selection, set_selection, clear_selection, read_editor_logs, set_transform_gizmo, undo, redo
Builds	Listing, exact reads, creation options, streamed downloads, primary build selection and deletion	list_builds, get_build, create_build, download_build, set_primary_build, delete_build
Store	PlayCanvas Store search and import, licenses, Sketchfab search and import, and My Assets search and import	store_search, store_get, store_download, list_store_licenses, sketchfab_search, sketchfab_get, sketchfab_import, my_assets_search, my_assets_import
Runtime	Launch lifecycle and options, engine version discovery, screenshots, logs, live state inspection and keyboard, mouse and touch input	launch_start, launch_stop, list_engine_versions, capture_runtime, read_runtime_logs, query_runtime_state, inject_input
VCS	Branches, checkpoints, restore and hard reset, merges, conflict resolution and checkpoint diffs	vcs_status, list_branches, create_branch, switch_branch, close_branch, open_branch, delete_branch, list_checkpoints, create_checkpoint, get_checkpoint, restore_checkpoint, hard_reset_checkpoint, start_merge, get_merge, resolve_conflicts, get_conflict_file, apply_merge, cancel_merge, diff_checkpoints

Asset transfers over 20 MiB use 1 MiB chunks. The server reads and writes local files incrementally, while the Editor spools uploads to browser storage and consumes downloads as streams instead of buffering the entire transfer in memory.

The Runtime tools drive a real Launch instance (the Editor's Launch button) so an agent can verify that a scene actually runs: screenshot the running app, read its console output, query live entity state, and inject keyboard/mouse/touch input. Allow pop-ups for the editor origin so launch_start can open the launch window — it reuses your existing PlayCanvas login session. The Editor relays runtime:* calls to that window, so it needs no local access permission of its own. Calling launch_start with no options adopts an app that is already running (adopted: true in the response) instead of restarting it; pass any option to force a fresh launch. It also reports the engine and graphics backend it ran with (engineVersion, deviceType) and a sessionId that changes on every launch; omitting engineVersion uses the Editor's own selection, and list_engine_versions reports the available channels and that default for both launch_start and create_build. create_build normalises its result to { buildId, appId, status, url, name }, so the durable build job id that get_build, set_primary_build and delete_build take is returned directly instead of the app id.

Every tool returns a consistent { data, meta } envelope: meta.status is ok or error (with an actionable message), list tools paginate via limit/offset and meta.nextCursor, and mutating tools return the resulting entity/asset summaries so follow-up list calls are rarely needed.

Development

To hack on the server itself, ensure you have Node.js 22.18 or later installed. Follow these steps:

1. Clone the repository:

   git clone https://github.com/playcanvas/editor-mcp-server.git
   cd editor-mcp-server
   

2. Install dependencies:

   npm install
   

3. Start the server (Node runs the TypeScript source directly — no build step):

   npm run watch
   

4. Point your MCP client at the checkout instead of the npm package with "command": "node" and "args": ["/path/to/editor-mcp-server/src/server.ts"].

npm run debug starts the server under the MCP Inspector and npm run build produces the self-contained bundle that gets published.