Listen to Events - Official LarAgent Documentation

Quickstart

Start with creation of the listener:

php artisan make:listener AgentListener

Name AgentListener is used as example, you can name it as you wish

Import LarAgent event of your choice (You can find a list below) and implement handle method:

namespace App\Listeners;

use Illuminate\Contracts\Queue\ShouldQueue;
use Illuminate\Queue\InteractsWithQueue;
use LarAgent\Events\AgentInitialized;

class AgentListener
{
    /**
     * Create the event listener.
     */
    public function __construct()
    {
        //
    }

    /**
     * Handle the event.
     */
    public function handle(AgentInitialized $event): void
    {
        // Just DD the event info as example
        dd('Agent has been initialized:', $event);
    }
}

Open the app\Providers\AppServiceProvider.php and register event with listener:

namespace App\Providers;

use Illuminate\Support\ServiceProvider;
use Illuminate\Support\Facades\Event;

use LarAgent\Events\AgentInitialized;
use App\Listeners\AgentListener;

class AppServiceProvider extends ServiceProvider
{
    /**
     * Register any application services.
     */
    public function register(): void
    {
        //
    }

    /**
     * Bootstrap any application services.
     */
    public function boot(): void
    {
        Event::listen(
            AgentInitialized::class,
            AgentListener::class
        );

        // MCP Test per-second rate limiter
        \Illuminate\Support\Facades\RateLimiter::for('mcp-test', function ($request) {
            return \Illuminate\Cache\RateLimiting\Limit::perSecond(2)->by($request->user()?->id ?: $request->ip());
        });
    }
}

You are good to go! Anytime, when agent will be initialized, the handle method will be executed.

Available Events

AgentDTO Structure

Each event that includes agentDto uses the following Data Transfer Object structure:

<?php

namespace LarAgent\Core\DTO;

class AgentDTO
{
    public function __construct(
        public readonly string $provider,
        public readonly string $providerName,
        public readonly ?string $message,
        public readonly array $tools = [],
        public readonly ?string $instructions = null,
        public readonly ?array $responseSchema = [],
        public readonly array $configuration = []
    ) {}

    public function toArray(): array
    {
        return [
            'provider' => $this->provider,
            'providerName' => $this->providerName,
            'message' => $this->message,
            'tools' => $this->tools,
            'instructions' => $this->instructions,
            'responseSchema' => $this->responseSchema,
            'configuration' => $this->configuration,
        ];
    }
}

Lifecycle Events

These events track the main lifecycle stages of an agent conversation.

AgentInitialized

Dispatched when the agent completes its initialization process and is ready to handle conversations. Namespace:

LarAgent\Events\AgentInitialized

Available Data:

agentDto

AgentDTO

required

Complete agent configuration including provider, tools, instructions, and response schema.

Example:

public function handle(AgentInitialized $event): void
{
    $provider = $event->agentDto->provider;
    $tools = $event->agentDto->tools;
    // Your logic here
}

ConversationStarted

Dispatched when the respond() method begins execution, marking the start of a new conversation turn. Namespace:

LarAgent\Events\ConversationStarted

Available Data:

agentDto

AgentDTO

required

Current agent configuration at the start of the conversation.

Example:

public function handle(ConversationStarted $event): void
{
    $message = $event->agentDto->message;
    // Log conversation start, initialize metrics, etc.
}

ConversationEnded

Dispatched when the respond() method completes execution, indicating the end of a conversation turn. Namespace:

LarAgent\Events\ConversationEnded

Available Data:

agentDto

AgentDTO

required

Final agent configuration at the end of the conversation.

message

MessageInterface|array|null

required

The final response message or null if no response was generated.

Message instance includes the token usage data. You can use toArrayWithMeta to get it as an array

Example:

public function handle(ConversationEnded $event): void
{
    $response = $event->message;
    // Log conversation end, calculate metrics, cleanup, etc.
}

ToolChanged

Dispatched when tools are dynamically added to or removed from the agent during runtime. Namespace:

LarAgent\Events\ToolChanged

Available Data:

agentDto

AgentDTO

required

Current agent configuration.

tool

ToolInterface

required

The tool instance that was added or removed.

added

boolean

required

true if the tool was added, false if it was removed.

Example:

public function handle(ToolChanged $event): void
{
    $toolName = $event->tool->getName();
    $action = $event->added ? 'added' : 'removed';
    // Log tool changes, update UI, etc.
}

AgentCleared

Dispatched when the agent’s state is cleared, typically resetting conversation history and context. Namespace:

LarAgent\Events\AgentCleared

Available Data:

agentDto

AgentDTO

required

Agent configuration at the time of clearing.

Example:

public function handle(AgentCleared $event): void
{
    // Clear related caches, reset session data, etc.
}

EngineError

Dispatched when an error occurs in the LLM engine during processing. Namespace:

LarAgent\Events\EngineError

Available Data:

agentDto

AgentDTO

required

Agent configuration when the error occurred.

exception

Throwable

required

The exception that was thrown by the LLM engine.

Example:

public function handle(EngineError $event): void
{
    $error = $event->exception->getMessage();
    $provider = $event->agentDto->provider;
    // Log error, send alerts, implement fallback logic, etc.
}

Hook Events (Before/After)

These events provide hooks before and after critical operations, allowing you to modify behavior or track execution flow.

BeforeReinjectingInstructions

Dispatched before instructions are reinjected into the conversation history. Namespace:

LarAgent\Events\BeforeReinjectingInstructions

Available Data:

agentDto

AgentDTO

required

Current agent configuration.

chatHistory

ChatHistoryInterface

required

The chat history interface before instruction reinjection.

Example:

public function handle(BeforeReinjectingInstructions $event): void
{
    $history = $event->chatHistory;
    // Modify history, add context, etc.
}

BeforeSend

Dispatched just before adding message in chat history Namespace:

LarAgent\Events\BeforeSend

Available Data:

agentDto

AgentDTO

required

Current agent configuration.

history

ChatHistoryInterface

required

The complete conversation history being sent.

message

MessageInterface|null

required

The message about to be sent, or null if sending history only.

Example:

public function handle(BeforeSend $event): void
{
    $messageContent = $event->message?->getContent();
    // Log outgoing messages, modify content, add tracking, etc.
}

AfterSend

Dispatched immediately after adding LLM response to Chat history. Namespace:

LarAgent\Events\AfterSend

Available Data:

agentDto

AgentDTO

required

Current agent configuration.

history

ChatHistoryInterface

required

The conversation history that was sent.

message

MessageInterface

required

The message that was successfully sent.

Example:

public function handle(AfterSend $event): void
{
    $sentMessage = $event->message->getContent();
    // Track message delivery, update metrics, etc.
}

BeforeSaveHistory

Dispatched before persisting the conversation history to storage. Namespace:

LarAgent\Events\BeforeSaveHistory

Available Data:

agentDto

AgentDTO

required

Current agent configuration.

history

ChatHistoryInterface

required

The conversation history about to be saved.

Example:

public function handle(BeforeSaveHistory $event): void
{
    $history = $event->history;
    // Sanitize data, add metadata, validate before save, etc.
}

BeforeResponse

Dispatched before sending message to LLM Namespace:

LarAgent\Events\BeforeResponse

Available Data:

agentDto

AgentDTO

required

Current agent configuration.

history

ChatHistoryInterface

required

Current conversation history including the new response.

message

MessageInterface|null

required

The message that is about to sent to the LLM API or null.

Example:

public function handle(BeforeResponse $event): void
{
    $response = $event->message?->getContent();
    // Filter content, add formatting, validate response, etc.
}

AfterResponse

Dispatched right after receiving a message from LLM API Namespace:

LarAgent\Events\AfterResponse

Available Data:

agentDto

AgentDTO

required

Current agent configuration.

message

MessageInterface

required

The response message.

Example:

public function handle(AfterResponse $event): void
{
    $finalResponse = $event->message->getContent();
    // Log final response, update analytics, cache result, etc.
}

BeforeToolExecution

Dispatched just before a tool is executed by the agent. Namespace:

LarAgent\Events\BeforeToolExecution

Available Data:

agentDto

AgentDTO

required

Current agent configuration.

tool

ToolInterface

required

The tool instance about to be executed.

toolCall

ToolCallInterface

required

The tool call instance is going to be executed. Get details with getId, getToolName, & getArguments methods

Example:

public function handle(BeforeToolExecution $event): void
{
    $toolName = $event->tool->getName();
    // Log tool execution start, validate permissions, start timer, etc.
}

AfterToolExecution

Dispatched immediately after a tool completes execution. Namespace:

LarAgent\Events\AfterToolExecution

Available Data:

agentDto

AgentDTO

required

Current agent configuration.

tool

ToolInterface

required

The tool instance that was executed.

toolCall

ToolCallInterface

required

The tool call instance is going to be executed. Get details with getId, getToolName, & getArguments methods

result

mixed

required

The result returned by the tool execution.

Example:

public function handle(AfterToolExecution $event): void
{
    $toolName = $event->tool->getName();
    $result = $event->result;
    // Log results, track performance, cache output, etc.
}

BeforeStructuredOutput

Dispatched before processing structured output from the LLM response. Namespace:

LarAgent\Events\BeforeStructuredOutput

Available Data:

agentDto

AgentDTO

required

Current agent configuration including the response schema.

response

array

required

The raw structured response array before processing.

Example:

public function handle(BeforeStructuredOutput $event): void
{
    $schema = $event->agentDto->responseSchema;
    $response = $event->response;
    // Validate structure, log details, etc.
}

​Quickstart

​Available Events

​AgentDTO Structure

​Lifecycle Events

​AgentInitialized

​ConversationStarted

​ConversationEnded

​ToolChanged

​AgentCleared

​EngineError

​Hook Events (Before/After)

​BeforeReinjectingInstructions

​BeforeSend

​AfterSend

​BeforeSaveHistory

​BeforeResponse

​AfterResponse

​BeforeToolExecution

​AfterToolExecution

​BeforeStructuredOutput

Quickstart

Available Events

AgentDTO Structure

Lifecycle Events

AgentInitialized

ConversationStarted

ConversationEnded

ToolChanged

AgentCleared

EngineError

Hook Events (Before/After)

BeforeReinjectingInstructions

BeforeSend

AfterSend

BeforeSaveHistory

BeforeResponse

AfterResponse

BeforeToolExecution

AfterToolExecution

BeforeStructuredOutput