pipecat/changelog/4407.added.md

• Added first-class RTVI support for the UI Agent Protocol:
  • Adds ui-event, ui-snapshot, and ui-cancel-task client-to-server messages, plus ui-command and ui-task server-to-client messages, with paired *Data / *Message pydantic models.
  • Adds built-in command payload models for Toast, Navigate, ScrollTo, Highlight, Focus, Click, SetInputValue, and SelectText; matching default handlers live in @pipecat-ai/client-react.
  • Adds RTVIProcessor.on_ui_message for inbound ui-event, ui-snapshot, and ui-cancel-task messages.
  • Adds five UI pipeline frames, mirroring the client-message frame-and-event pattern: downstream code pushes RTVIUICommandFrame / RTVIUITaskFrame for the observer to wrap into outbound UICommandMessage / UITaskMessage envelopes, while the processor pushes inbound RTVIUIEventFrame, RTVIUISnapshotFrame, and RTVIUICancelTaskFrame alongside on_ui_message.
  • Bumps the RTVI PROTOCOL_VERSION from 1.2.0 to 1.3.0.