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The Prompt tab is where you set your agent’s opening line and write its instructions. This is the core of what makes your agent unique.

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System prompt

The system prompt is the main set of instructions for your agent. It defines the agent’s personality, goals, rules, and conversation flow. Write your prompt in the large box under the Opening line card on the Prompt tab. A long prompt scrolls inside the box. A token counter in the bottom corner shows the approximate size. Tips for good prompts:
  • Be specific about the agent’s role and goals
  • Define what the agent should and shouldn’t do
  • Include example phrases or responses
  • Describe how to handle edge cases
Use the Enhance with AI button to get suggestions for improving your prompt.

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Opening line

The opening line is the first thing your agent says when a conversation starts. Set it in the Opening line card at the top of the Prompt tab. Leave it empty to let the agent open in its own words. Example: “Hi there, is this {{contact.firstName}}?”

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Variables

Use variables in your prompt and opening line to personalize conversations. Click the Variables button to see all available options. Nedzo uses dot notation for variables — {{contact.firstName}}, {{trigger.conversation.summary}}, etc. Pick the namespace, then drill in.
The legacy flat syntax ({{contactFirstName}}, {{contactEmail}}, etc.) still works for backwards compatibility with existing prompts and workflows. New prompts should use dot notation — it’s clearer, scales to nested data like custom fields, and matches the variable picker.

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System variables

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Contact variables

Custom fields are available under {{contact.customFields.<fieldName>}}.

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Custom fields

You can create workspace-level custom fields for data that’s specific to your business in Settings > Workspace > Custom fields & Tags. These are available across all agents in the workspace.

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Tone of voice and answer length

Set how your agent sounds on the agent’s Identity tab. You also pick both when you create an agent. Tone of voice: Answer length: Concise, Standard (the default), or Thorough. Answer length is the only length setting. Chat agents used to have a second one, Response Length, in the Settings tab. It is gone, so the two can no longer clash. Both settings apply on every conversation, on voice, chat, and web agents. This holds even when you leave them on Neutral and Standard.
Nedzo picks the AI model for every agent. There is no model or temperature to set, and the model doesn’t show in Conversation Logs or in API responses.

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Language

Set the agent’s language on the Identity tab, under Voice and language. Supported languages:
  • English
  • Spanish
  • Portuguese
  • French
  • German
  • Dutch
  • Chinese
  • Japanese
Changing the language resets your voice selection, since voices are language-specific.

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Voice

Give your agent a natural-sounding voice. Voice settings are available for voice agents and web agents.

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Voice selection

Pick a voice on the Identity tab, under Voice and language. The section has three pickers: Language, Multilingual and Voice. The Voice list holds every voice for your language, across all its accents. There is no separate step to pick an accent first. Each option shows the voice name with two tags:
  • Gender — Male or Female
  • Accent — the variation, for example American or British
For example, an English voice can read Emma with the tags Female and American. You can search the list by name or by a tag, like “British”. If you have not picked a voice yet, the picker starts on the default voice for the language. Click the play button next to any voice to preview it before selecting.

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Voice speed

Adjust how fast your agent speaks with the speed slider: Slower speeds work well for complex information. Faster speeds feel more natural for casual conversations.