colossal-xylophone-68609
04/15/2026, 5:47 PMtall-airline-16756
04/15/2026, 5:48 PMtall-airline-16756
04/15/2026, 5:48 PMcolossal-xylophone-68609
04/15/2026, 5:50 PMtall-airline-16756
04/15/2026, 5:51 PM@function_tool but given no instructions/description.
Short answer: technically yes, the tool is registered and available to the LLM, but practically unlikely to be used reliably.
Why:
• The LLM decides when to invoke tools based on each tool's description (in Python the function docstring).
• If a tool has no docstring/description, the LLM lacks guidance and will rarely — if ever — pick it, or may choose it unpredictably.
• Best practice: always provide a clear description explaining what the tool does, when it should be used, and its parameters so the agent can select it correctly.
If you want, tell me the tool's signature and what behavior you expect and I’ll suggest a concise description you can add.
Sources: Function tool definition | LiveKit Documentation | The Handoff Pattern for Voice Agents That Replaces IVR Menus | LiveKit, with interactive elementscolossal-xylophone-68609
04/15/2026, 5:57 PMtall-airline-16756
04/15/2026, 5:57 PM@function_tool docstring or description) but isn't mentioned in the agent's global instruction parameter.
Short answer: yes — the agent can use that tool.
Why:
• The LLM decides tool use based on the tool metadata it can see (the tool's description) plus the agent's overall instructions and the user's query.
• If the tool has a clear description, the LLM can recognize when the tool is relevant and invoke it even if the agent's instruction text doesn't explicitly list that tool.
• If the description is vague or missing, the LLM is much less likely to pick the tool, so clear, specific descriptions are important.
If you want, share the agent instruction and the tool description you used and I’ll suggest wording to make the LLM pick the tool reliably.
, with interactive elements