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Middleware with the Responses API

This sample demonstrates multiple middleware layers working together: PII filtering, guardrails, function invocation logging, and human-in-the-loop approval.

What this sample demonstrates

  • Agent-level run middleware (PII filtering, guardrail enforcement)
  • Function-level middleware (logging, result overrides)
  • Human-in-the-loop approval workflows for sensitive function calls
  • Using .AsBuilder().Use() to compose middleware
  • 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_Step12_Middleware