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Evaluation - Custom Evals
This sample demonstrates writing custom domain-specific evaluation functions using FunctionEvaluator.Create. Custom evaluators run locally with no cloud evaluator service needed — useful for enforcing business rules, format requirements, or safety guardrails.
What this sample demonstrates
- Writing custom checks with
FunctionEvaluator.Createfor domain-specific logic - Checking that a customer support agent doesn't refuse to help
- Verifying responses contain actionable steps (numbered lists or bullet points)
- Enforcing response length constraints
- Combining multiple custom checks into a
LocalEvaluator
Prerequisites
- .NET 10 SDK or later
- Azure authentication available to
DefaultAzureCredential(for local development, runaz 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-4o-mini"
Run the sample
cd dotnet/samples/02-agents/Evaluation
dotnet run --project .\Evaluation_CustomEvals
See also
- Evaluation_SimpleEval — Simplest evaluation using Foundry quality evaluators (Relevance, Coherence)
- Evaluation_ExpectedOutputs — Evaluating against ground-truth expected outputs
- Evaluation_MixedProviders — Combining custom + Foundry evaluators in one call