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.

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 AIAssistantEventsDelegate.
• After the run completes, persisted Agentic Messages arrive via the CometChatMessageDelegate.

Real-time Events

Events are received via the onAIAssistantEventReceived method of the AIAssistantEventsDelegate protocol 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.

import CometChatSDK

class AIAssistantEventHandler: AIAssistantEventsDelegate {
    
    private let sdkStreamListenerId = "unique_listener_id"
    
    /// Call this to start listening to AI Assistant events
    func addListener() {
        CometChat.addAIAssistantListener(sdkStreamListenerId, self)
        print("AIAssistantListener added successfully.")
    }
    
    /// Call this to remove the AI Assistant listener
    func removeListener() {
        CometChat.removeAIAssistantListener(sdkStreamListenerId)
        print("AIAssistantListener removed successfully.")
    }
    
    func onAIAssistantEventReceived(_ event: AIAssistantBaseEvent) {
        print("Received AI Event: \(event.type) for Run ID: \(event.id)")
    }
}

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 CometChatMessageDelegate 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.

import CometChatSDK

let listenerId = "unique_listener_id"

class MessageHandler: CometChatMessageDelegate {
    
    // Adding the MessageListener
    // CometChat.addMessageListener(listenerId, self)
    
    func onAIAssistantMessageReceived(_ aiAssistantMessage: AIAssistantMessage) {
        print("AI Assistant Message Received: \(aiAssistantMessage)")
    }
    
    func onAIToolResultMessageReceived(_ aiToolResultMessage: AIToolResultMessage) {
        print("AI Tool Result Message Received: \(aiToolResultMessage)")
    }
    
    func onAIToolArgumentsMessageReceived(_ aiToolArgumentMessage: AIToolArgumentMessage) {
        print("AI Tool Arguments Message Received: \(aiToolArgumentMessage)")
    }
}