Agent_Step17_OpenAPITools

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 Frankfurter exchange rate 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
• 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

dotnet run