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, usecodex 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

Open your project in the PlayCanvas Editor.
Click the MCP button at the bottom of the toolbar (below the Publish button).
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 to127.0.0.1 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, screenshots, logs, live state inspection and keyboard, mouse and touch input	`launch_start`, `launch_stop`, `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.

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:

Clone the repository:

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

Install dependencies:
```
npm install
```
Start the server (Node runs the TypeScript source directly — no build step):
```
npm run watch
```
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.