Hugo Costa developed a Chat CLI Stop hook trigger for the aws/amazon-q-developer-cli repository, enabling automated post-response processing within the chat workflow. He extended the HookTrigger enum to include a Stop variant, implemented the HookExecutor, and integrated these components with ChatSession response finalization. This work established a foundation for downstream analytics, filtering, and compliance auditing by allowing custom logic to execute after each assistant response. Hugo updated the project documentation to guide users on the new workflow. The project was delivered in Rust, leveraging skills in CLI development, event handling, and documentation, and demonstrated focused, foundational engineering within a short timeframe.