Streaming

Stream Copilot responses in Laravel Copilot SDK for CLI, SSE, WebSocket, and Livewire workflows.

Streaming

When you set streaming: true in SessionConfig, you can receive Copilot responses as a stream. Stdio and TCP modes already behave similarly to streaming. The difference is that you also receive ASSISTANT_MESSAGE_DELTA.

use Revolution\Copilot\Contracts\CopilotSession;
use Revolution\Copilot\Facades\Copilot;
use Revolution\Copilot\Types\SessionEvent;

$config = new SessionConfig(
    streaming: true,
);

Copilot::start(function (CopilotSession $session) {
    $session->on(function (SessionEvent $event): void {
        if ($event->isAssistantMessageDelta()) {
            // Delta events arrive in chunks. Use them for progressive output.
            echo $event->deltaContent();
        } elseif ($event->isAssistantMessage()) {
            // After all delta chunks are sent, one full ASSISTANT_MESSAGE arrives.
            // If there is another message, delta events repeat.
        } elseif ($event->isAssistantReasoningDelta()) {
            // Reasoning delta events are also chunked.
            echo $event->deltaContent();
        }
    });

    $session->sendAndWait(prompt: 'Tell me something about Laravel.');
}, config: $config);

• For smooth output, print chunks as-is without adding line breaks.
• Do not combine with Laravel Prompts spin(), because display output can break.

Practical usage patterns

Artisan command

As shown above, print directly with echo or $this->output->write(). This is easy to understand because the display is similar to running Copilot CLI directly. You can also use Laravel Prompts stream() to display output with a fade-in effect.

use function Laravel\Prompts\stream;

Artisan::command('copilot:streaming {--resume=}', function () {
    $config = new SessionConfig(
        streaming: true,
    );

    Copilot::start(function (CopilotSession $session) {
        info('Starting Copilot with streaming: '.$session->id());

        $stream = stream();

        $session->on(function (SessionEvent $event) use ($stream) {
            if ($event->isAssistantMessageDelta()) {
                // Delta chunks arrive in pieces. Use Laravel Prompts stream() for smooth output with a fade-in effect.
                $stream->append($event->deltaContent());
            } elseif ($event->isIdle()) {
                // Close after idle completes. Works correctly for multiple prompts in the same session, so calling `$stream = stream()` again is not needed.
                $stream->close();
            }
        });

        while (true) {
            $prompt = text(
                label: 'Enter your prompt',
                placeholder: 'Ask me anything...',
                required: true,
                hint: 'Ctrl+C to exit',
            );

            $session->sendAndWait($prompt);
        }
    }, config: $config, resume: $this->option('resume'));
})->purpose('Copilot streaming');

Deliver as SSE on a web page

Using response()->eventStream()

response()->eventStream() was added around the Laravel 12 release period. This package supports Laravel 12+, so you can use it.

Route::get('/copilot/sse', function () {
    return response()->eventStream(function () {
        yield from Copilot::stream(function (CopilotSession $session) {
            foreach ($session->sendAndStream('Tell me something about Laravel.') as $event) {
                if ($event->isAssistantMessageDelta()) {
                    yield $event->deltaContent();
                }
            }
        }, config: new SessionConfig(streaming: true));
    });
});

Route::get('/copilot', function () {
    return view('copilot');
});

Using response()->stream()

Route::get('/copilot/sse', function () {
    return response()->stream(function () {
        Copilot::start(function (CopilotSession $session) {
            $session->on(function (SessionEvent $event) {
                if ($event->isAssistantMessageDelta()) {
                    echo "event: update\n";
                    echo 'data: '.$event->deltaContent()."\n\n";
                    ob_flush();
                    flush();
                }
            });

            $session->sendAndWait('Tell me something about Laravel.');
        }, config: new SessionConfig(streaming: true));

        echo "event: update\n";
        echo "data: </stream>\n\n";
        ob_flush();
        flush();
    }, 200, [
        'Content-Type' => 'text/event-stream',
        'Cache-Control' => 'no-cache',
        'Connection' => 'keep-alive',
        'X-Accel-Buffering' => 'no',
    ]);
});

Route::get('/copilot', function () {
    return view('copilot');
});

Frontend example

copilot.blade.php below is only for quick verification. For production, use Laravel’s official npm packages if you are using React or Vue: @laravel/stream-react or @laravel/stream-vue.

<html>
<body>

<script>
    const source = new EventSource('/copilot/sse');

    source.addEventListener('update', (event) => {
        if (event.data === '</stream>') {
            source.close();

            return;
        }

        console.log(event.data);
        document.getElementById("output").innerHTML += event.data;
    });
</script>

<h1>Copilot SSE Test</h1>
<div id="output"></div>
</body>
</html>

WebSocket delivery

You can also deliver delta updates over WebSocket by combining Laravel notifications, broadcasting, and Reverb.

Livewire wire:stream

You can stream output in Livewire using the wire:stream directive.

<?php

use Livewire\Attributes\Layout;
use Livewire\Component;
use Revolution\Copilot\Contracts\CopilotSession;
use Revolution\Copilot\Enums\SessionEventType;
use Revolution\Copilot\Facades\Copilot;
use Revolution\Copilot\Types\SessionEvent;

new class extends Component
{
    public string $prompt = 'Tell me about Laravel Livewire.';
    public string $question = '';
    public string $answer = '';
    public ?string $sessionId = null;

    function submitPrompt(): void
    {
        $this->question = $this->prompt;

        $this->prompt = '';

        $this->answer = '';

        $this->js('$wire.copilot()');
    }

    public function copilot(): void
    {
        Copilot::start(function (CopilotSession $session) {
            $this->sessionId = $session->id();

            $session->on(SessionEventType::ASSISTANT_MESSAGE_DELTA, function (SessionEvent $event): void {

                $this->stream(
                    content: $event->deltaContent(),
                    to: 'answer',
                );
                $this->answer = $event->deltaContent();
            });

            $response = $session->sendAndWait(prompt: $this->question);
            $this->answer = $response->content();
        }, config: ['streaming' => true], resume: $this->sessionId);
    }
};
?>

<div>
    <div class="border border-gray-200 rounded-lg p-4 mb-6">
        @if ($question)
            <h3 class="font-extrabold mb-3">{{ $question }}</h3>

            <div wire:stream="answer">{{ $answer }}</div>
        @endif
    </div>

    <flux:input.group>
        <flux:input wire:model="prompt" placeholder="Ask Copilot"/>
        <flux:button wire:click="submitPrompt" icon="paper-airplane" icon:variant="outline"></flux:button>
    </flux:input.group>
</div>

For the latest updates, see the GitHub repository.