Extension SDK

drawtonomy extensions are iframe-hosted web apps that talk to the editor through postMessage. The SDK gives you a typed client; the dev-server gives you a local editor to develop against.

This page is a quick orientation. The full guide — manifest schema, capabilities list, message protocol — is in the public repo:

➡ Extension Development Guide (日本語)

Quick start

# Editor on :3000
pnpm add -g @drawtonomy/dev-server
drawtonomy-dev-server

# Your extension on :3001
cd my-extension && pnpm dev --port 3001

open "http://localhost:3000/?ext=http://localhost:3001/manifest.json"

Minimum extension

my-extension/
  manifest.json
  index.html
  src/

manifest.json

{
  "id": "my-extension",
  "name": "My Extension",
  "version": "1.0.0",
  "entry": "./index.html",
  "capabilities": ["shapes:read", "shapes:write", "ui:panel"]
}

src/main.ts

import { ExtensionClient, createVehicle } from '@drawtonomy/sdk'

const client = new ExtensionClient()
await client.ready()

document.getElementById('add')!.addEventListener('click', async () => {
  await client.addShapes([createVehicle(0, 0, { templateId: 'sedan' })])
})

Reference extensions

The in-tree extensions are full-fidelity examples:

• ai-scene-generator — natural-language and OpenSCENARIO scene generation.
• template-preview — preview a shape template.
• exporter-playground — exercise the exporter against a live canvas.
• path-footprint-lab — Path Footprint experimentation.

See also

• Extension architecture — why iframes, why postMessage.
• @drawtonomy/sdk overview — the package and its modules.