> ## Documentation Index
> Fetch the complete documentation index at: https://docs.anyreach.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Agents overview

> What an agent is, what it's made of, and how it gets to a live phone call.

An **agent** is the AI participant on the other end of a phone call. You configure it once, publish it, and assign it to a phone number — then it can place outbound calls or answer inbound ones autonomously.

## Anatomy of an agent

Every agent has these layers:

| Layer               | What it controls                                                                           |
| ------------------- | ------------------------------------------------------------------------------------------ |
| **Voice**           | TTS provider, voice ID, language, speed, emotion                                           |
| **LLM**             | Model that drives the conversation (GPT-4o, GPT-4.1, Llama-3.3-70B, etc.)                  |
| **STT**             | Speech-to-text model (Deepgram Nova, Gladia Solaria, AnyReach default)                     |
| **Instructions**    | System prompt — purpose, personality, conversation flow, guardrails                        |
| **Knowledge bases** | Vector indexes the agent retrieves from to answer factual questions                        |
| **Tools**           | Actions the agent can take during a call (transfer, send DTMF, run a workflow, query a KB) |
| **Phone numbers**   | Numbers assigned to this agent for inbound routing                                         |

## The seven configuration sections

The agent edit page is structured as a wizard with seven sections you fill in order:

1. **Purpose & Personality** — industry, purpose, personality, language, voice
2. **Agent Instructions** — opening line, conversation flow, closing
3. **Rules & Boundaries** — guardrails, what the agent must never do
4. **Knowledge** — knowledge bases attached
5. **Abilities** — tools (workflows, transfers, KB lookups, etc.)
6. **Advanced Instructions** — fine-grained prompt overrides
7. **Deployment** — phone numbers, publishing, SIP

You don't have to fill every section. Defaults are sensible for most fields.

## Versioning

Agents are versioned. Edits modify a **draft** version. Calls always use the latest **published** version. Click **Publish** when you're satisfied with your changes — the new version takes effect on the next call.

You can roll back to a prior version from the version history panel.

## Lifecycle

```
draft → tested in simulator → published → assigned to number → live
```

A published agent without a phone number assignment exists but won't receive calls. A draft can be tested in the simulator, but won't take real calls.