Agent_Step11_AsFunctionTool

Agent as a Function Tool with the Responses API

This sample demonstrates how to use one agent as a function tool for another agent.

What this sample demonstrates

• Creating a specialized agent (weather) with function tools
• Exposing an agent as a function tool using .AsAIFunction()
• Composing agents where one agent delegates to another
• No server-side agent creation or cleanup required

Prerequisites

• .NET 10 SDK or later
• Microsoft Foundry service endpoint and deployment configured
• An authenticated Azure identity (for example, sign in with az login)

Set the following environment variables:

$env:FOUNDRY_PROJECT_ENDPOINT="https://your-foundry-service.services.ai.azure.com/api/projects/your-foundry-project"
$env:FOUNDRY_MODEL="gpt-5.4-mini"

Run the sample

cd dotnet/samples/02-agents/AgentProviders/foundry
dotnet run --project .\Agent_Step11_AsFunctionTool