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The End call tool lets you give the assistant a rule set for when it may disconnect from its side. You enable it under Prompt & Tools in the Standard tools section, then fill in when hanging up is allowed.

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Set it up

  1. Open the assistant → Prompt & Tools.
  2. In Standard tools, turn on End call so the tool is selected (highlighted).
  3. A configuration panel opens below.
  4. In the when the assistant may end the call field, describe the conditions in as much detail as possible — the clearer your rules, the more reliably the behavior matches what you want.

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What to write

You are defining under which circumstances the AI is allowed to hang up. Examples:
  • Simple: End the call when all questions are answered and the caller no longer needs help.
  • More detailed: Also allow ending when an appointment was successfully booked, when the caller clearly says goodbye, or when the conversation is clearly finished.
Cover as many realistic cases as you can (success paths, goodbyes, “nothing else needed”) so the model does not end too early or too late.

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Tip on wording

Many teams draft and refine these rules with an LLM (for example Claude or ChatGPT): describe your process in plain language and ask for a tight checklist-style instruction you can paste into the tool field.
Related: Prompt & Tools, Assistant call forwarding (cold vs warm), Mid-call AI tool.