Files

OpenAPI Tools with the Responses API

This sample shows how to use OpenAPI tools with a ChatClientAgent using the Responses API directly.

What this sample demonstrates

  • Defining an OpenAPI specification inline
  • Creating an OpenAPIFunctionDefinition for the REST Countries API
  • Using FoundryAITool.CreateOpenApiTool() with ChatClientAgent
  • Server-side execution of OpenAPI tool calls

Prerequisites

  • .NET 10 SDK or later
  • Microsoft Foundry service endpoint and deployment configured
  • Azure CLI installed and authenticated (az login)

Set the following environment variables:

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

Run the sample

dotnet run