A2A Developer Resources

// Import the A2A client library
import { A2AClient } from '@google/a2a-protocol';

// Initialize the A2A client
const client = new A2AClient({
  agentId: 'my-agent-id',
  capabilities: ['text-processing', 'data-analysis'],
  apiKey: process.env.A2A_API_KEY
});

// Connect to the A2A network
await client.connect();
console.log('Connected to A2A network!');

// Discover agents with specific capabilities
const agents = await client.discoverAgents({
  capabilities: ['image-generation'],
  limit: 5
});

console.log('Found agents:', agents);

// Get detailed information about a specific agent
const agentInfo = await client.getAgentInfo('agent-id-123');
console.log('Agent details:', agentInfo);

// Define the task to delegate
const task = {
  type: 'text-summarization',
  content: 'Long text to summarize...',
  parameters: {
    maxLength: 100,
    format: 'bullet-points'
  }
};

// Find an agent that can handle this task
const agents = await client.discoverAgents({
  capabilities: ['text-summarization'],
  limit: 1
});

if (agents.length > 0) {
  // Delegate the task
  const result = await client.delegateTask(agents[0].id, task);
  console.log('Task result:', result);
} else {
  console.log('No suitable agent found');
}

// Create a collaboration session
const session = await client.createCollaborationSession({
  name: 'Data Analysis Project',
  description: 'Analyze customer data and generate insights'
});

// Add agents to the session
await session.addAgent('data-processing-agent-id');
await session.addAgent('visualization-agent-id');
await session.addAgent('report-generation-agent-id');

// Define the workflow
const workflow = {
  steps: [
    {
      agentId: 'data-processing-agent-id',
      task: { type: 'data-cleaning', input: 'raw-data' }
    },
    {
      agentId: 'visualization-agent-id',
      task: { type: 'create-charts', dependsOn: 0 }
    },
    {
      agentId: 'report-generation-agent-id',
      task: { type: 'generate-report', dependsOn: 1 }
    }
  ]
};

// Execute the workflow
const result = await session.executeWorkflow(workflow);
console.log('Workflow completed:', result);

// Helper function for retry logic
async function withRetry(fn, maxRetries = 3, delay = 1000) {
  let lastError;

  for (let attempt = 1; attempt <= maxRetries; attempt++) {
    try {
      return await fn();
    } catch (error) {
      lastError = error;
      console.warn(`Attempt ${attempt} failed: ${error.message}`);

      if (attempt < maxRetries) {
        // Exponential backoff
        const backoffDelay = delay * Math.pow(2, attempt - 1);
        console.log(`Retrying in ${backoffDelay}ms...`);
        await new Promise(resolve => setTimeout(resolve, backoffDelay));
      }
    }
  }

  throw new Error(`All ${maxRetries} attempts failed. Last error: ${lastError.message}`);
}

// Example usage with A2A client
async function delegateTaskWithRetry(agentId, task) {
  try {
    // Connect with retry logic
    await withRetry(() => client.connect(), 3, 2000);

    // Delegate task with retry logic
    const result = await withRetry(() =>
      client.delegateTask(agentId, task)
    );

    return result;
  } catch (error) {
    console.error('Failed to complete task:', error);
    // Implement fallback strategy
    return await fallbackStrategy(task);
  }
}

// Fallback strategy when all retries fail
async function fallbackStrategy(task) {
  console.log('Using fallback strategy for task');
  // Implement alternative processing method
  return { status: 'completed_by_fallback', result: 'Fallback result' };
}