---
title: Built-in Tools
subtitle: System tools for conversation control
slug: how-to-tools-built-in-tools
section: Tools
description: Learn where to configure built-in system tools for each agent and how they work.
---

## Overview

Built-in tools are system actions (sometimes called **system tools**). They let your agent make conversation-level decisions like ending the call, transferring to another agent or a human, or handling voicemail.

## Where to configure

Configure built-in tools in the urvo dashboard for your agent:

- Open your agent's **Tools** page.
- Click **Add Tool**.
- Choose **Built-in Tool** to open the System tools modal.
- Enable tools and set any tool-specific rules, then click **Save**.
- When you save, the dashboard updates your agent's built-in tool configuration and syncs system tool definitions.

## Tool catalog

### `end_call`

Gracefully conclude the call when the user is done or explicitly indicates they want to end the conversation.

- **When to call:** user says goodbye/finishes the task, or the conversation naturally reaches a conclusion.
- **Config:** disable interruptions (optional).

### `language_detection`

Switch response language when the user explicitly asks to speak in another language.

- **When to call:** direct language requests (e.g., "Switch to Spanish").
- **Config:** disable interruptions (optional).

### `skip_turn`

Pause and wait for the user to speak again when they need a moment to think or perform an action.

- **When to call:** user says they need a second (e.g., "Give me a minute").
- **Config:** disable interruptions (optional).

### `transfer_to_agent`

Hand off to another AI agent based on conditions you define.

- **Config:** disable interruptions (optional) and a list of transfer rules.
- **Transfer rule fields:** target agent, condition, delay (ms), transfer message, and whether to enable the transferred agent's first message.
- **Behavior note:** the agent should not ask for confirmation and should not reveal that the user was transferred.

### `transfer_to_number`

Escalate to a human operator when appropriate (explicit human requests, limitations, or complex issues).

- **Config:** disable interruptions (optional) and human transfer rules.
- **Human transfer rule fields:** transfer type (conference or SIP REFER), destination type (phone number or SIP URI), phone number, and condition.
- **Behavior note:** try to help within your capabilities first unless the user explicitly requests human support or the issue is beyond you.

### `play_keypad_touch_tone`

Play DTMF tones so the caller can navigate automated phone menus or enter codes.

- **Config:** disable interruptions (optional) and `useOutOfBandDTMF` (useful for SIP calls only).
- **DTMF basics:** digits plus special tones; pauses can be added to allow time for IVR steps.

### `voicemail_detection`

Detect voicemail answering and optionally play a configured message before ending the call.

- **Config:** disable interruptions (optional) and an optional voicemail message.
- **Important:** provide a specific reason when the agent decides voicemail is detected (based on what was heard).

## Next steps

- Learn how to add workspace tools in [Webhook Tools](/how-to/tools/webhook-tools).
- Learn how connected CRMs/calendars become tools in [Integration Tools](/how-to/tools/integration-tools).