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11 Evaluation and Observability

Phase 3 - Systems
Stage 11 of 14. Previous: Stage 10 - Multi-Agent Systems. Next: Stage 12 - Security and Ethics.

Goal

Learn to measure, test, trace, and debug agent systems.

Learn

  • Agent quality metrics
  • Tool unit tests
  • Flow integration tests
  • Prompt regression tests
  • RAG evaluation
  • Tracing and structured logging
  • Human review
  • Tools such as LangSmith, Ragas, DeepEval, Helicone, LangFuse, and OpenLLMetry

Build

Create an evaluation suite with test cases, expected outcomes, cost tracking, latency tracking, and trace review.

Exit Criteria

  • You can define success metrics before changing prompts or models.
  • You can trace an agent run from user input to final response.
  • You can reproduce and debug failures.

Checkpoint

Use the Stage 11 checkpoint before moving on.