Developed an enhancement for the 0xPlaygrounds/rig repository focused on improving streaming event observability and user experience. The work centered on the Streaming Events ToolCallDelta feature, where the developer added the tool name to streaming events and refactored the ToolCallDelta structure for greater clarity and extensibility. This update enables applications to display which tool is being called during streaming, supporting better debugging and future tooling improvements. The implementation leveraged Rust, with an emphasis on asynchronous programming and streaming development. The approach prioritized maintainability and clear semantics, laying a foundation for broader enhancements to streaming workflows in upcoming quarters.