Thanks for reaching out! I wanted to share that LiveKit doesn’t emit a specific external event exactly when a function tool starts execution. But don’t worry—there are two important moments where you can keep track of tool-related actions: • When the LLM decides to call a tool: This is captured internally as a

FunctionCallEvent

within the

RunResult

system. You can also catch this through the

conversation_item_added

event, which logs the function call as it’s added to the chat history. • When the tool finishes execution: After all requested tools have run, the

function_tools_executed

event is emitted. This event gives you details about the function calls and their results. If you’d like, I’m here to help clarify anything or assist you with implementing these events—just let me know! Sources: Events and error handling | LiveKit Docs | tests/test_evals.py | Events and error handling | LiveKit Docs