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

# System Functions

> Built-in functions that extend your AI agent's capabilities

## Overview

System Functions are pre-built capabilities available to all AI agents. Unlike [Custom Functions](/features/custom-functions) which call external webhooks, System Functions are built into the platform and handle common tasks like ending calls, transferring to humans, and sending messages.

<Frame caption="Toggle built-in functions on or off for each agent from the Functions tab">
  <img src="https://mintlify.s3.us-west-1.amazonaws.com/snapsonic/images/agent-functions-tab.png" alt="Agent functions tab" />
</Frame>

<Frame caption="Scroll through all available system functions">
  <img src="https://mintlify.s3.us-west-1.amazonaws.com/snapsonic/images/agent-functions-scroll.gif" alt="Functions tab scroll" />
</Frame>

## Available Functions

### End Call

Allows the agent to hang up when the conversation is complete.

| Setting            | Description                                  |
| ------------------ | -------------------------------------------- |
| **Enable/Disable** | Toggle whether the agent can end calls       |
| **Condition**      | Customize when the agent should end the call |

**Default Condition:**

```
End the phone call. Use this when the conversation is complete,
the caller says goodbye, or there is nothing more to discuss.
```

**Custom Condition Examples:**

* "End the call after confirming the appointment and saying goodbye"
* "End the call only after the caller explicitly says goodbye or asks to hang up"
* "End the call after completing the order and providing the confirmation number"

<Note>
  When End Call is disabled, calls will only end when the caller hangs up.
</Note>

***

### Transfer

Transfer the call to another phone number when needed.

| Setting              | Description                                 |
| -------------------- | ------------------------------------------- |
| **Enable/Disable**   | Toggle whether the agent can transfer calls |
| **Transfer Numbers** | Configure destination numbers with labels   |

**Configuration:**

1. Go to **Agents** → Select agent → **Functions** tab
2. Enable **Transfer** toggle
3. Click **Configure** to add transfer destinations

Each transfer destination has:

* **Label**: Name the agent uses (e.g., "Sales", "Support", "Mobile")
* **Phone Number**: Destination in E.164 format (+1234567890)

**Example Usage:**

```
Caller: "Can I speak to a real person?"
Agent: "Of course, let me transfer you to our support team."
[Agent transfers call to configured support number]
```

***

### SMS

Send text messages during or after calls.

| Setting            | Description                           |
| ------------------ | ------------------------------------- |
| **Enable/Disable** | Toggle whether the agent can send SMS |

**Capabilities:**

* Send follow-up information after calls
* Text links, confirmations, or details
* Respond to caller requests for written info

**Example Usage:**

```
Caller: "Can you text me the address?"
Agent: "Absolutely, I'll send that to you right now."
[Agent sends SMS with address details]
```

***

### Extract Data

Collect structured information from conversations.

| Setting            | Description                 |
| ------------------ | --------------------------- |
| **Enable/Disable** | Toggle data extraction      |
| **Variables**      | Define what data to collect |

**Variable Types:**

* **Text**: Names, addresses, notes
* **Number**: Phone numbers, quantities, amounts
* **Boolean**: Yes/no confirmations
* **Enum**: Selection from predefined options

**Configuration:**

1. Go to **Agents** → Select agent → **Functions** tab
2. Enable **Extract Data** toggle
3. Click **Configure** to define variables

Each variable has:

* **Name**: Variable identifier (snake\_case)
* **Type**: Data type to collect
* **Description**: Helps AI understand what to collect

**Example Variables:**

| Name             | Type    | Description                      |
| ---------------- | ------- | -------------------------------- |
| `caller_name`    | Text    | The caller's full name           |
| `email`          | Text    | Email address for follow-up      |
| `party_size`     | Number  | Number of guests for reservation |
| `needs_callback` | Boolean | Whether caller wants a callback  |

***

### Booking

Schedule appointments via calendar integration.

| Setting            | Description                |
| ------------------ | -------------------------- |
| **Enable/Disable** | Toggle appointment booking |
| **Calendar**       | Connected calendar service |

**Supported Integrations:**

* Google Calendar
* Cal.com
* Calendly (coming soon)

**Configuration:**

1. Connect your calendar in **Apps** → **Integrations**
2. Go to **Agents** → Select agent → **Functions** tab
3. Enable **Booking** toggle
4. Click **Configure** to set availability

**Example Usage:**

```
Caller: "I'd like to schedule an appointment for next week"
Agent: "I can help with that. I have openings on Tuesday at 2pm
       or Wednesday at 10am. Which works better for you?"
```

## Configuring System Functions

All system functions are configured in the **Functions** tab of your agent settings:

1. Navigate to **Agents** in the sidebar
2. Select the agent you want to configure
3. Click the **Functions** tab
4. Toggle functions on/off
5. Click **Configure** to customize each function

Changes save automatically.

## Best Practices

<CardGroup cols={2}>
  <Card title="Clear Conditions" icon="message">
    Write specific end call conditions so your agent knows exactly when to hang up
  </Card>

  <Card title="Label Transfer Numbers" icon="phone">
    Use descriptive labels like "Sales Team" instead of just "Office"
  </Card>

  <Card title="Extract What Matters" icon="database">
    Only extract data you'll actually use - too many variables can confuse the AI
  </Card>

  <Card title="Test Thoroughly" icon="flask">
    Make test calls to verify each function works as expected
  </Card>
</CardGroup>