To use the RPC feature in a LiveKit agent, you need to: • Import the required SDK packages for your language: ◦ Node.js:

@livekit/rtc-node

and

livekit-server-sdk

◦ Python:

livekit

package • Register RPC methods your agent will handle. For example: ◦ Node.js: `room.localParticipant?.registerRpcMethod( 'greet', async (data) => { console.log(

Received greeting from ${data.callerIdentity}: ${data.payload}

); return `Hello, ${data.callerIdentity}!

;
  }
);

◦ Python:

@room.local_participant.register_rpc_method("greet")
async def handle_greet(data):
    print(f"Received greeting from {data.caller_identity}: {data.payload}")
    return f"Hello, {data.caller_identity}!"

• Invoke RPC methods on other participants: ◦ Node.js:

const response = await room.localParticipant!.performRpc({
  destinationIdentity: 'recipient-identity',
  method: 'greet',
  payload: 'Hello from RPC!',
});

◦ Python:

response = await room.local_participant.perform_rpc(
  destination_identity='recipient-identity',
  method='greet',
  payload='Hello from RPC!'
)

• Work with RPC data types such as

RpcInvocationData

(for handler input),

PerformRpcRequest

(for making calls), and

RegisterRpcMethodRequest

(for registration). • Handle errors by throwing

RpcError

in your handler if needed. Other errors will be sent as "Application Error". The essential pattern is: 1. Connect to the LiveKit room 2. Register your RPC methods 3. Handle incoming invocations in your handler 4. Call RPC methods on other participants as needed This enables powerful agent-to-agent or agent-to-client communication using custom RPC methods. Sources: packages/livekit-rtc/README.md | livekit-rtc/livekit/rtc/_proto/rpc_pb2.py | Remote method calls (RPC) | LiveKit Docs | Web and mobile frontends | LiveKit Docs