Rust
The Rust output is generated wire/contract types — the structs and enums that model the GISL API and event payloads, consumed internally (for example by the processing workers). It is not a hand-written ergonomic SDK, and it is not published as a crate for general use.
It is in development. Track progress in the GitHub organisation on GitHub.
If you are building an application against the API, use the published TypeScript or PHP SDKs, which provide the file-first ergonomic surface.