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Using Function Tools with the Responses API

This sample demonstrates how to use function tools with the ChatClientAgent, allowing the agent to call custom functions to retrieve information.

What this sample demonstrates

  • Creating function tools using AIFunctionFactory
  • Passing function tools to a ChatClientAgent
  • Running agents with function tools (text output)
  • Running agents with function tools (streaming output)
  • No server-side agent creation or cleanup required

Prerequisites

Before you begin, ensure you have the following prerequisites:

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

Note: This sample uses DefaultAzureCredential. az login is the easiest local development path, but Visual Studio, VS Code, and managed identity credentials also work when available.

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

Navigate to the Foundry sample directory and run:

cd dotnet/samples/02-agents/AgentProviders/foundry
dotnet run --project .\Agent_Step03_UsingFunctionTools