---
title: Core concepts
description: "The objects Callab AI is built from, and how they relate: agents, versions, tools, outcomes, phone numbers, campaigns, deployments, contacts and workspaces."
---

Everything in the dashboard is one of a dozen things. Learn these and every screen
makes sense.

## Agent

The thing that talks. An agent has a **modality**, voice or text, chosen at creation
and fixed for its life. It has a **prompt type**: a single prompt, or a flow made of
connected nodes. It has a language, a voice (voice agents) or a model (text agents),
a prompt, tools, outcomes and advanced settings.

An agent lives in the **agent workspace**, reached from **AI Agents**. The workspace
has four groups of sections: **Build** (Settings, Advanced, Flow, Tools, Outcomes,
Memory), **Testing** (Chat, Call, Evaluation), **Improve** (Recommendations, Change
Requests) and **Release** (Publish, Widget, Deployments, Versions). Which
sections appear depends on the agent: only flow agents have **Flow**, only voice
agents have **Call**, only text agents have **Chat** and **Deployments**, and
**Memory** appears once data retention and memory are on.

## Version

Every save creates a version. Versions are numbered `v<major>.<revision>`, listed
newest first under **Versions**, and each one records exactly what changed. You can
compare two versions and roll back to any of them. Saving does not take a version
live: **Publish** does, once the launch checks pass.

## Prompt

The agent's brief, written in three fields: **Agent Identity** (who it is),
**Tasks** (what it does) and **Guardrails** (what it must and must not do). A fourth
setting, **First message**, is what it says when it speaks first. The prompt can be
generated from a description, a website or a document with **Generate With AI**.

## Tool

An action the agent may take during a conversation. Built-in tools are **End Call**,
**Transfer Call**, **Redirect to Agent**, **Press Keys (DTMF)**, **Schedule
Callback**, **Live Webhook**, **Send Email**, **Cal.com**, **Zapier**, **Knowledge
Base** and **MCP**. Tools have their own section, **Tools** under
**Build**, where **Add tool** adds one and each configured tool is listed with its
description. The description is what the model reads to decide when to use it.

## Dynamic variable

A placeholder in the prompt, filled per conversation: from a contact's metadata in a
campaign, or from a default value. Managed from the **Variables** button next to the
prompt.

## Outcome

A structured field the agent fills once a conversation ends, such as
`customer_intent` with a fixed list of possible values. Outcomes appear as columns in
**Call Logs** and on each call's page. Defined under **Outcomes** in the workspace.

## Phone number

A number an agent can answer on or call from. Numbers come from a <Term>SIP trunk</Term>, your own
Twilio account or a Go Auto Dial extension. Managed under **Phone Numbers**.

## Campaign

How voice agents reach people. An **outbound campaign** calls a list of contacts from
a phone number with an agent, within calling hours and with a retry policy. An
**inbound campaign** answers calls to a number with an agent. Managed under
**Launch AI Voice**.

## Contact

A person with a phone number, a category, a tag and optional metadata. Contacts are
the audience of outbound campaigns and are managed under **Contacts**, one at a time
or by importing a file.

## Deployment

Where a text agent is live: a Slack workspace, a Telegram bot, a Microsoft Teams app,
a WhatsApp Business number or a Discord server. Managed under **Launch AI Text**,
or from the agent's own **Deployments** section.

## Widget

A chat or call interface for a web page, styled in the agent's **Widget** section and
embedded with one script tag.

## Call and conversation

A **call** is one phone or browser conversation with a voice agent, with a recording,
a transcript, a summary, quality scores and outcomes. A **conversation** is the same
for a text agent: turns, tokens, tool calls. Found under **Call Logs** and
**Conversations**.

## Workspace and company

A **company** is your account: members, billing, storage, phone numbers. A
**workspace** is a partition inside it that holds agents, campaigns and contacts.
Every company starts with a Default Workspace; switch with the selector at the bottom
of the sidebar.

## Related

- [Anatomy of an agent](/build/anatomy-of-an-agent)
- [Quickstart: your first voice agent](/get-started/quickstart-voice-agent)
- [Glossary](/get-started/glossary)