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

# AI Agents

# AI Agents Overview

AI Agents enable intelligent, automated interactions within your application. They can process user messages, trigger tools, and respond with contextually relevant information. For a broader introduction, see the [AI Agents section](/ai-agents).

> **Note:**
> Currently, an Agent only responds to **Text Messages**.

## Agent Run Lifecycle and Message Flow

This section explains how a user’s text message to an Agent becomes a structured "run" which emits real-time events and then produces agentic messages for historical retrieval.

* A user sends a text message to an Agent.
* The platform starts a run and streams real-time events via the **`AIAssistantListener`**.
* After the run completes, persisted Agentic Messages arrive via the **`MessageListener`**.

### Real-time Events

Events are received via the **`onAIAssistantEventReceived`** method of the **`AIAssistantListener`** class in this general order:

1. Run Start
2. Zero or more tool call cycles (repeats for each tool invocation):
   * Tool Call Start
   * Tool Call Arguments
   * Tool Call End
   * Tool Call Result
3. One or more assistant reply streams:
   * Text Message Start
   * Text Message Content (multiple times; token/char streaming)
   * Text Message End
4. Run Finished

Notes:

* `Run Start` and `Run Finished` are always emitted.
* `Tool Call` events appear only when a backend or frontend tool is invoked. There can be multiple tool calls in a single run.
* `Text Message` events are always emitted and carry the assistant’s reply incrementally.

<Tabs>
  <Tab title="Java">
    ```java theme={null}

    String LISTENERS_TAG = "UNIQUE_LISTENER_ID";

    CometChat.addAIAssistantListener(LISTENERS_TAG, new CometChat.AIAssistantListener() {
        @Override
        public void onAIAssistantEventReceived(AIAssistantBaseEvent aiAssistantBaseEvent) {
            Log.d(TAG, "AIAssistant event received successfully: " + aiAssistantBaseEvent.toString());
        }
    });

    ```
  </Tab>

  <Tab title="Kotlin">
    ```kotlin theme={null}

    val LISTENERS_TAG = "UNIQUE_LISTENER_ID"

    CometChat.addAIAssistantListener(LISTENERS_TAG, object : CometChat.AIAssistantListener() {
        override fun onAIAssistantEventReceived(aiAssistantBaseEvent: AIAssistantBaseEvent) {
            Log.d(TAG, "AIAssistant event received successfully: " + aiAssistantBaseEvent.toString())
        }
    })

    ```
  </Tab>
</Tabs>

#### Event descriptions

* Run Start: A new run has begun for the user’s message.
* Tool Call Start: The agent decided to invoke a tool.
* Tool Call Arguments: Arguments being passed to the tool.
* Tool Call End: Tool execution completed.
* Tool Call Result: Tool’s output is available.
* Text Message Start: The agent started composing a reply.
* Text Message Content: Streaming content chunks for progressive rendering.
* Text Message End: The agent reply is complete.
* Run Finished: The run is finalized; persisted messages will follow.

### Agentic Messages

These events are received via the **`MessageListener`** after the run completes.

* `AIAssistantMessage`: The full assistant reply.
* `AIToolResultMessage`: The final output of a tool call.
* `AIToolArgumentMessage`: The arguments that were passed to a tool.

<Tabs>
  <Tab title="Java">
    ```java theme={null}

    String listenerId = "UNIQUE_LISTENER_ID";

    CometChat.addMessageListener(listenerId, new CometChat.MessageListener() {
        @Override
        public void onAIAssistantMessageReceived(AIAssistantMessage aiAssistantMessage) {
            Log.d(TAG, "AIAssistantMessage received successfully: " + aiAssistantMessage.toString());
        }

        @Override
        public void onAIToolResultReceived(AIToolResultMessage aiToolResultMessage) {
            Log.d(TAG, "AIToolResultMessage received successfully: " + aiToolResultMessage.toString());
        }

        @Override
        public void onAIToolArgumentsReceived(AIToolArgumentMessage aiToolArgumentMessage) {
            Log.d(TAG, "AIToolArgumentMessage received successfully: " + aiToolArgumentMessage.toString());
        }
    });

    ```
  </Tab>

  <Tab title="Kotlin">
    ```kotlin theme={null}

    val listenerId = "UNIQUE_LISTENER_ID"

    CometChat.addMessageListener(listenerId, object : CometChat.MessageListener() {
        override fun onAIAssistantMessageReceived(aiAssistantMessage: AIAssistantMessage) {
            Log.d(TAG, "AIAssistantMessage received successfully: " + aiAssistantMessage.toString())
        }

        override fun onAIToolResultReceived(aiToolResultMessage: AIToolResultMessage) {
            Log.d(TAG, "AIToolResultMessage received successfully: " + aiToolResultMessage.toString())
        }

        override fun onAIToolArgumentsReceived(aiToolArgumentMessage: AIToolArgumentMessage) {
            Log.d(TAG, "AIToolArgumentMessage received successfully: " + aiToolArgumentMessage.toString())
        }
    })

    ```
  </Tab>
</Tabs>