pipecat/changelog/4493.changed.md

• PipelineTask now inherits from BaseTask, so every pipeline task is also a bus participant. It accepts a new optional bridged=() parameter that auto-wraps the pipeline with bus edge processors, letting the task exchange frames with other bridged tasks over the shared TaskBus. The bus is supplied by PipelineRunner via task.attach(registry=..., bus=...) instead of through the constructor.