---
title: "Building a CallWhiz AI agent in an afternoon"
description: "Describe the job in plain language and CallWhiz AI drafts the agent section by section, flags the gaps with a lint pass, keeps every version, and lets you test by phone or in the browser."
url: "https://callwhiz.ai/docs/building-an-agent"
updated: "2026-09-21"
---


# Building a CallWhiz AI agent in an afternoon

Building a CallWhiz AI agent takes an afternoon: describe the job, edit the drafted instructions, fix what the lint pass flags, and test before it goes anywhere near a customer. Every version is kept and can be restored.

**In short:** Describe the job in plain language and the agent is drafted for you, section by section, with the gaps flagged before it goes live.

## Definitions

- **Lint pass:** A check that catches the mistakes that cause bad calls: a missing boundary, a tool the agent cannot actually call, a rule that contradicts the compliance pack.
- **Version:** A saved state of the agent, with who changed it and when. Any version can be restored.

## What it does

- Describe the job; the instructions are written for you, then edited by you.
- A lint pass catches the mistakes that cause bad calls: missing boundaries, a tool the agent cannot actually call, a rule that contradicts the compliance pack.
- Every version is kept, with who changed it and when, and any version can be restored.
- Test by phone or in the browser before it goes anywhere near a customer.

## Related questions

**How long does it take to build an agent?** Building a CallWhiz AI agent takes an afternoon. You describe the job in plain language, the instructions are drafted for you section by section, a lint pass flags the gaps that cause bad calls, every version is kept and can be restored, and you test by phone or in the browser before going live.

**Do I have to talk to sales?** No. Sign up, build an agent, put it on a number, be live today. Scoping applies only when you want it running inside your own infrastructure.

## Related

- [Testing a CallWhiz AI agent before it goes live](https://callwhiz.ai/docs/testing)
- [How CallWhiz AI answers from your documents](https://callwhiz.ai/docs/knowledge)
- [The CallWhiz AI API, SDK and webhooks](https://callwhiz.ai/docs/api)