vizra-adk-workflows

name	Vizra ADK Workflows
description	Orchestrate complex multi-agent workflows - sequential, parallel, conditional, and loop patterns

Vizra ADK Workflow Patterns

Workflows orchestrate multiple agents to accomplish complex tasks. Vizra ADK supports sequential, parallel, conditional, and loop workflows.

Workflow Types

Workflow	Use Case
Sequential	Steps that must execute in order
Parallel	Independent tasks that can run simultaneously
Conditional	Branching based on conditions or results
Loop	Iterating over data or repeating until condition met

Sequential Workflow

Execute agents in order, passing results between steps:

use Vizra\VizraADK\Workflows\SequentialWorkflow;

$workflow = SequentialWorkflow::create()
    ->addStep('research', ResearchAgent::class)
    ->addStep('analyze', AnalysisAgent::class)
    ->addStep('report', ReportGeneratorAgent::class);

$result = $workflow->run([
    'topic' => 'Market trends in AI',
    'depth' => 'comprehensive'
]);

Passing Data Between Steps

$workflow = SequentialWorkflow::create()
    ->addStep('fetch', DataFetcherAgent::class)
    ->addStep('transform', function ($previousResult, $context) {
        // Transform data from previous step
        return TransformAgent::run($previousResult['data'])
            ->withParameters(['format' => 'json'])
            ->go();
    })
    ->addStep('store', DataStorageAgent::class);

Parallel Workflow

Run multiple agents simultaneously for independent tasks:

use Vizra\VizraADK\Workflows\ParallelWorkflow;

$workflow = ParallelWorkflow::create()
    ->addTask('sentiment', SentimentAnalysisAgent::class)
    ->addTask('keywords', KeywordExtractionAgent::class)
    ->addTask('summary', SummarizationAgent::class);

$results = $workflow->run([
    'text' => $documentText
]);

// Results contain output from all agents
// $results['sentiment'], $results['keywords'], $results['summary']

With Timeout

$workflow = ParallelWorkflow::create()
    ->addTask('fast', FastAgent::class)
    ->addTask('slow', SlowAgent::class)
    ->timeout(30); // 30 second timeout

$results = $workflow->run($input);

Conditional Workflow

Branch execution based on conditions:

use Vizra\VizraADK\Workflows\ConditionalWorkflow;

$workflow = ConditionalWorkflow::create()
    ->addStep('classify', ClassificationAgent::class)
    ->branch(
        condition: fn($result) => $result['category'] === 'urgent',
        then: UrgentHandlerAgent::class,
        else: StandardHandlerAgent::class
    );

$result = $workflow->run(['ticket' => $ticketContent]);

Multiple Conditions

$workflow = ConditionalWorkflow::create()
    ->addStep('analyze', AnalysisAgent::class)
    ->switch(
        selector: fn($result) => $result['priority'],
        cases: [
            'high' => HighPriorityAgent::class,
            'medium' => MediumPriorityAgent::class,
            'low' => LowPriorityAgent::class,
        ],
        default: StandardAgent::class
    );

Loop Workflow

Iterate over data or repeat until condition:

use Vizra\VizraADK\Workflows\LoopWorkflow;

// Iterate over items
$workflow = LoopWorkflow::create()
    ->forEach(
        items: fn($context) => $context['documents'],
        agent: DocumentProcessorAgent::class
    );

$results = $workflow->run([
    'documents' => $documentList
]);

With Condition

$workflow = LoopWorkflow::create()
    ->repeat(
        agent: RefinementAgent::class,
        until: fn($result, $iteration) =>
            $result['quality_score'] >= 0.9 || $iteration >= 5
    );

Map-Reduce Pattern

$workflow = LoopWorkflow::create()
    ->map(
        items: fn($ctx) => $ctx['chunks'],
        agent: ChunkProcessorAgent::class
    )
    ->reduce(
        agent: AggregatorAgent::class
    );

$result = $workflow->run([
    'chunks' => $textChunks
]);

Complex Workflow Compositions

Research Pipeline

$researchPipeline = SequentialWorkflow::create()
    // Step 1: Gather information from multiple sources in parallel
    ->addStep('gather', ParallelWorkflow::create()
        ->addTask('web', WebResearchAgent::class)
        ->addTask('database', DatabaseResearchAgent::class)
        ->addTask('documents', DocumentResearchAgent::class)
    )
    // Step 2: Analyze gathered information
    ->addStep('analyze', AnalysisAgent::class)
    // Step 3: Generate report
    ->addStep('report', ReportGeneratorAgent::class);

$report = $researchPipeline->run([
    'topic' => 'Competitive analysis',
    'sources' => ['web', 'internal_docs', 'database']
]);

Customer Service Escalation

$customerService = ConditionalWorkflow::create()
    // Initial classification
    ->addStep('classify', TicketClassifierAgent::class)
    // Route based on complexity
    ->branch(
        condition: fn($r) => $r['complexity'] === 'simple',
        then: SequentialWorkflow::create()
            ->addStep('respond', AutoResponderAgent::class)
            ->addStep('close', TicketCloserAgent::class),
        else: ConditionalWorkflow::create()
            ->branch(
                condition: fn($r) => $r['requires_human'],
                then: HumanEscalationAgent::class,
                else: SequentialWorkflow::create()
                    ->addStep('research', IssueResearchAgent::class)
                    ->addStep('respond', DetailedResponderAgent::class)
            )
    );

Data Processing Pipeline

$dataPipeline = SequentialWorkflow::create()
    // Validate incoming data
    ->addStep('validate', DataValidationAgent::class)
    // Process each record
    ->addStep('process', LoopWorkflow::create()
        ->forEach(
            items: fn($ctx) => $ctx['records'],
            agent: RecordProcessorAgent::class
        )
    )
    // Aggregate results
    ->addStep('aggregate', AggregationAgent::class)
    // Generate summary
    ->addStep('summarize', SummaryAgent::class);

Error Handling in Workflows

$workflow = SequentialWorkflow::create()
    ->addStep('risky', RiskyAgent::class)
    ->onError(function ($error, $step, $context) {
        Log::error("Workflow failed at step: {$step}", [
            'error' => $error->getMessage()
        ]);

        // Return fallback or rethrow
        return FallbackAgent::run($context)->go();
    })
    ->addStep('continue', NextAgent::class);

Retry Logic

$workflow = SequentialWorkflow::create()
    ->addStep('api_call', ExternalApiAgent::class)
    ->withRetry(
        maxAttempts: 3,
        delay: 1000, // milliseconds
        backoff: 'exponential'
    );

Workflow Context

Access and modify context throughout workflow:

$workflow = SequentialWorkflow::create()
    ->addStep('init', function ($input, $context) {
        $context->set('started_at', now());
        return InitAgent::run($input)->go();
    })
    ->addStep('process', ProcessorAgent::class)
    ->addStep('finalize', function ($result, $context) {
        $duration = now()->diffInSeconds($context->get('started_at'));
        return FinalizeAgent::run($result)
            ->withParameters(['duration' => $duration])
            ->go();
    });

Performance Optimization

Use Parallel for Independent Tasks

// Good: Independent tasks run in parallel
$workflow = ParallelWorkflow::create()
    ->addTask('email', SendEmailAgent::class)
    ->addTask('sms', SendSmsAgent::class)
    ->addTask('push', SendPushAgent::class);

// Bad: Sequential when not needed
$workflow = SequentialWorkflow::create()
    ->addStep('email', SendEmailAgent::class)
    ->addStep('sms', SendSmsAgent::class)
    ->addStep('push', SendPushAgent::class);

Set Appropriate Timeouts

$workflow = ParallelWorkflow::create()
    ->addTask('fast', FastAgent::class)
    ->addTask('slow', SlowAgent::class)
    ->timeout(60)
    ->onTimeout(function ($completedTasks) {
        // Handle partial results
        return $completedTasks;
    });

Testing Workflows

class WorkflowTest extends TestCase
{
    public function test_sequential_workflow_completes()
    {
        $workflow = SequentialWorkflow::create()
            ->addStep('first', FirstAgent::class)
            ->addStep('second', SecondAgent::class);

        $result = $workflow->run(['input' => 'test']);

        $this->assertNotNull($result);
        $this->assertEquals('expected', $result['status']);
    }
}