> This is a page from the ElevenLabs documentation. For a complete page index, fetch https://elevenlabs.io/docs/llms.txt. For the full documentation in a single file, fetch https://elevenlabs.io/docs/llms-full.txt.

# End call

> **Warning**
>
> The **End Call** tool is added to agents created in the ElevenLabs dashboard by default. For
> agents created via API or SDK, if you would like to enable the End Call tool, you must add it
> manually as a system tool in your agent configuration. [See API Implementation below](#api-implementation) for details.

![End call](/docs/_fern-img/f260bfd4e43f7fb0374ce12d2ed984efb946a8ca9ebaa1c2d4b3e6d5f52a7851.webp)

## Overview

The **End Call** tool allows your conversational agent to terminate a call with the user. This is a system tool that provides flexibility in how and when calls are ended.

## Functionality

* **Default behavior**: The tool can operate without any user-defined prompts, ending the call when the conversation naturally concludes.
* **Custom prompts**: Users can specify conditions under which the call should end. For example:
  * End the call if the user says "goodbye."
  * Conclude the call when a specific task is completed.

**Purpose**: Automatically terminate conversations when appropriate conditions are met.

**Trigger conditions**: The LLM should call this tool when:

* The main task has been completed and user is satisfied
* The conversation reached natural conclusion with mutual agreement
* The user explicitly indicates they want to end the conversation

**Parameters**:

* `reason` (string, required): The reason for ending the call
* `message` (string, optional): A farewell message to send to the user before ending the call

**Function call format**:

```json
{
  "type": "function",
  "function": {
    "name": "end_call",
    "arguments": "{\"reason\": \"Task completed successfully\", \"message\": \"Thank you for using our service. Have a great day!\"}"
  }
}
```

**Implementation**: Configure as a system tool in your agent settings. The LLM will receive detailed instructions about when to call this function.

### API Implementation

When creating an agent via API, you can add the End Call tool to your agent configuration. It should be defined as a system tool:

```python
from elevenlabs import AgentConfig, ConversationalConfig, ElevenLabs

elevenlabs = ElevenLabs(api_key="YOUR_API_KEY")

response = elevenlabs.conversational_ai.agents.create(
    conversation_config=ConversationalConfig(
        agent=AgentConfig(
            prompt={
                "built_in_tools": {
                    "end_call": {
                        "type": "system",
                        "name": "end_call",
                        # Optional: customize when the tool should be triggered
                        "description": "",
                        "params": {"system_tool_type": "end_call"},
                    }
                }
            },
        ),
    ),
)
```

```javascript
import { ElevenLabsClient } from "@elevenlabs/elevenlabs-js";

const elevenlabs = new ElevenLabsClient({
  apiKey: "YOUR_API_KEY",
});

await elevenlabs.conversationalAi.agents.create({
  conversationConfig: {
    agent: {
      prompt: {
        builtInTools: {
          endCall: {
            type: "system",
            name: "end_call",
            description: "", // Optional: Customize when the tool should be triggered
            params: { systemToolType: "end_call" },
          },
        },
      },
    },
  },
});
```

```bash
curl -X POST https://api.elevenlabs.io/v1/convai/agents/create \
     -H "xi-api-key: YOUR_API_KEY" \
     -H "Content-Type: application/json" \
     -d '{
  "conversation_config": {
    "agent": {
      "prompt": {
        "built_in_tools": {
          "end_call": {
            "type": "system",
            "name": "end_call",
            "description": "",
            "params": { "system_tool_type": "end_call" }
          }
        }
      }
    }
  }
}'
```

> **Tip**
>
> Leave the description blank to use the default end call prompt.

## Example prompts

**Example 1: Basic End Call**

```
End the call when the user says goodbye, thank you, or indicates they have no more questions.
```

**Example 2: End Call with Custom Prompt**

```
End the call when the user says goodbye, thank you, or indicates they have no more questions. You can only end the call after all their questions have been answered. Please end the call only after confirming that the user doesn't need any additional assistance.
```

> ElevenLabs provides APIs and SDKs for text to speech, voice cloning, speech to text, sound effects, voice isolator, voice changer, and conversational AI agents. Build voice-enabled applications with lifelike audio generation.