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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