To send a text message from a Python LiveKit agent to all participants without adding it to chat history, you can use the

publish_data

method on the local participant. Here's an example:

# When connected to the room
await room.local_participant.publish_data(
    payload="Your message here",  # Can be a string or serialized JSON
    topic="your.custom.topic",    # Use a custom topic, not the chat topic
)

Key points: • Use

local_participant.publish_data()

to send data messages to all participants. • Specify a custom topic that's different from the chat topic (

lk.chat

). • You can leave

destinationIdentities

blank to send to all participants. • Messages can be up to 15KiB in size for reliable delivery. This approach ensures the message is sent to all participants without being added to the chat history. Sources: Job lifecycle | LiveKit Docs | Data messages | LiveKit Docs