Riza has introduced an Execute Function endpoint to its Code Interpreter API, allowing users to send Python, JavaScript, or TypeScript function bodies for execution rather than entire scripts. This feature addresses the limitations of the previous endpoint, which only supported scripts interacting with stdin and stdout, by enabling more efficient handling of structured inputs and outputs. Users can define a function named "execute" that takes a single input parameter and returns a JSON-serializable value, streamlining the execution process. This update enhances integration options for developers, who can now easily execute code functions and receive serialized JSON results. Riza encourages user feedback and engagement through Discord or email and offers additional resources like a post on Just-in-time Programming with Riza.