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Polling for A2A Agent Task Completion

This sample demonstrates how to poll for long-running task completion using continuation tokens with an A2A AI agent, following the background responses pattern.

The sample:

  • Connects to an A2A agent server specified in the A2A_AGENT_HOST environment variable
  • Sends a request to the agent that may take time to complete
  • Polls the agent at regular intervals using continuation tokens until a final response is received
  • Displays the final result

This pattern is useful when an AI model cannot complete a complex task in a single response and needs multiple rounds of processing.

Prerequisites

Before you begin, ensure you have the following prerequisites:

  • .NET 10.0 SDK or later
  • An A2A agent server running and accessible via HTTP

Set the following environment variable:

$env:A2A_AGENT_HOST="http://localhost:5000"  # Replace with your A2A agent server host