after each user turn completed I want to add a sys...
# ask-aib
broad-painter-9222
12/15/2025, 4:24 PMafter each user turn completed I want to add a system message to chat - how to do it?
t
tall-airline-16756
12/15/2025, 4:24 PMThanks for reaching out, mateuszkasprowicz. I'm an AI assistant and I'm here to help. Give me a moment while I research this topic.
tall-airline-16756
12/15/2025, 4:24 PMYou're asking how to add a system message after each user turn — you can do that by using the on_user_turn_completed hook and adding a system message to the chat context, then persisting the context.
Which language are you using (Python or TypeScript)? I can give the exact snippet you can drop into your Agent class and note where to persist the change.
Sources: Pipeline nodes and hooks | LiveKit docs
b
broad-painter-9222
12/15/2025, 4:24 PMPython
t
tall-airline-16756
12/15/2025, 4:25 PMBelow is a concise Python example you can drop into your Agent class to add a system message after each user turn and persist it.
Copy code
from livekit.agents import Agent, ChatContext, ChatMessage
class MyAgent(Agent):
async def on_user_turn_completed(
self,
turn_ctx: ChatContext,
new_message: ChatMessage,
) -> None:
# Insert a system message after the user's turn
turn_ctx.add_message(
role="system",
content="Always be polite and concise in your response."
)
# Persist the updated chat context so the system message is saved
await self.update_chat_ctx(turn_ctx)new_message2 Views