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

# Custom Function Calls

> Trigger external actions during calls — book, tag, notify, and more.

## Custom Function Calls

Let your AI **do things** — not just talk. Trigger APIs, update CRMs, send SMS, and more — mid-call.

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### Available Functions

| Function           | Trigger                | Example                 |
| ------------------ | ---------------------- | ----------------------- |
| `book_appointment` | "Yes, 3pm Tuesday"     | Syncs to GHL/Calendar   |
| `add_tag`          | Lead says "interested" | Tags in CRM: `hot-lead` |
| `send_sms`         | "Send me the link"     | Sends via Twilio        |
| `transfer_call`    | "Speak to manager"     | Routes to human         |
| `notify_slack`     | High-value lead        | Pings sales team        |

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### How to Add a Custom Function

1. Go to **Agent Editor** → **Tools** → **+ Add Function**
2. Choose from **pre-built** or **custom webhook**
3. Define:
   * **Name**: `send_brochure`
   * **Trigger Phrase**: `brochure`, `info pack`
   * **Action**: POST to `https://yourwebhook.com/send`
4. Test in **Playground**

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### Agency Scaling Tip

* Create **function templates** (e.g., `GHL Tag + SMS`)
* Clone per client
* Only change **webhook URL** and **tag name**
* Deploy in seconds

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<Note>
  All functions are **logged** in call transcript for compliance.
</Note>