# JS Engine Integration (QuickJS)

- Embed QuickJS for safe, deterministic, sandboxed transforms.
- No network, no filesystem by default; expose only Kompanion tool FFI shims.
- Use for text filters, parsers, light data munging; scripts under `~/.config/kompanion/js/`.
- FFI bridge: `js.callTool(name, args)` → JSON-RPC.