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Open the agent setup

  1. In the Partner Portal, open AI Agents → Retell Agents.
  2. Click Create New Agent.
  3. In Setup, choose the customer who will own the agent.
Create New Agent window showing the four setup sections and customer selector

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Complete the agent details

Move through the sections at the top of the window:
  • Basic Settings — enter the agent name and instructions, choose a voice and language, and set the opening message.
  • Advanced Settings — adjust voice, conversation, call, audio, outbound, and webhook options when needed. The defaults are suitable for many agents.
  • Function Calls — connect customer tools when this section is available for your account.
The production portal currently marks Function Calls as Work in Progress. Avoid relying on it for a live customer until that notice is removed.
Review the selected customer and required fields, then click Create Agent.

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After creation

Find the new agent on the Retell Agents page. From there, you can open its details, change the customer assignment, or manage its webhook.