eval-harness

Eval-driven development uses a formal evaluation framework to define, implement, and run capability and regression tests. It applies structured criteria across model versions and prompts to ensure consistent quality checks and traceable results.

You can run capability and regression evaluations by initializing the eval harness in your Claude Code sessions. It applies predefined tests to verify new features meet acceptance criteria and guards existing behavior against changes.

Yes, the evaluation framework supports code-based, model-based, and human graders. This grader diversity covers both deterministic checks for automated software testing and qualitative assessments for complex model outputs.

Yes, Claude Code supports automated eval workflows directly. The eval harness initializes within your sessions to provide repeatable test plans, requiring no external dependencies to define and run structured capability evaluations.

The best way to store traceable evaluation results is using a formal eval framework that organizes eval definitions, run histories, and baselines. This produces a traceable eval artifact for rapid audits and releases.

You need an evaluation framework to solve evaluation bottlenecks and enable consistent quality checks. It applies structured criteria across prompts and agent workflows to verify behavior and ensure stability during development.