IDE command is "Trigger Parameter Hints", depends on editorHasSignatureHelperProvider. Attached simple example for rust code <img width="343" alt="Screenshot 2023-08-07 at 12 15 55 PM" src="https://github.com/facebookexperimental/starlark-rust/assets/943596/c66496b0-9684-4f85-875f-fb1ba899e293">