eval-harness

Define evaluation criteria and run regression tests for Claude Code sessions.

1|Updated Apr 6, 2026
One-click install
npx skills add https://github.com/zero3041/PREP --skill eval-harness-zero3041
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: eval-harness
Source: https://github.com/zero3041/PREP/tree/main/.claude/skills/skills/eval-harness
Command: npx skills add https://github.com/zero3041/PREP --skill eval-harness-zero3041

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes scripts (resource) components.

What problem does it solve?

This Skill provides a formal evaluation framework to implement eval-driven development (EDD), helping to define criteria, measure performance, and catch regressions early in AI-assisted workflows.

Core Features & Use Cases

  • Formal Evaluation: Standardize evaluations of Claude Code sessions for reliability and quality.
  • EDD Implementation: Support for eval-driven development practices.
  • Benchmarking and Regression Testing: Ensure existing functionality remains stable and new features perform as expected.

Quick Start

To activate the eval-harness, use the command "/eval define feature-name" to set up evaluation criteria for a new feature.

Frequently Asked Questions about eval-harness

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I implement eval-driven development for AI workflows?

You can implement eval-driven development by defining formal evaluation criteria, benchmarking performance, and running regression tests to ensure AI workflow reliability. This framework standardizes AI session assessments to catch regressions early.

How do I set up evaluation criteria for a new feature in Claude Code?

To set up evaluation criteria for a new feature in Claude Code, use the command "/eval define feature-name". This initializes the formal evaluation framework to measure performance and catch regressions for that specific feature.

What is eval-driven development and when do I need it for AI development?

Eval-driven development is a practice that defines formal criteria, measures performance, and benchmarks AI sessions to catch regressions early. You need it when ensuring reliability and stability in AI-assisted workflows is critical.

Does this formal evaluation framework support regression testing for existing functionality?

Yes, the formal evaluation framework supports regression testing to ensure existing functionality remains stable. It benchmarks current performance against defined criteria to verify that new features do not break existing AI sessions.

Can I use evaluation scripts for continuous assessment in AI sessions?

Yes, you can use evaluation scripts for continuous assessment in AI sessions. The framework applies these scripts to Claude Code sessions to ensure ongoing reliability and stability throughout the development workflow.