premiere-pro-mcp / rules

---
description: ES3 ExtendScript generation and string escaping for CEP/AE host scripts
globs:
  - src/bridge/**/*.ts
  - src/tools/**/*.ts
  - cep-plugin/**
  - after-effects-cep-plugin/**
alwaysApply: false
---

# ExtendScript

Generated Premiere/AE scripts must be ECMAScript 3.

```javascript
// BAD
const name = item.name;
items.forEach((x) => doWork(x));

// GOOD
var name = item.name;
for (var i = 0; i < items.length; i++) {
  doWork(items[i]);
}
```

Forbidden in generated host code: `let`, `const`, arrows, template literals, destructuring, spread, default parameters, `forEach`/`map`/`filter`.

Escape every user-controlled string with `escapeForExtendScript` before embedding. Never interpolate raw paths, names, expressions, or prompts.

Use `buildToolScript` / `buildScript` and existing helpers (`__result`, `__error`, `__findProjectItem`, `__findSequence`). Prefer documented Premiere APIs; label QE DOM (`app.enableQE()`) as experimental.