eval-engineer

name	eval-engineer
description	Define and maintain lightweight evaluations (acceptance criteria, regression checks, golden tests) so "green" is objective and repeatable.

Eval Engineer — Make "Green" Objective

Use this skill when:

• A change risks regressions
• "Done" is ambiguous
• You need to justify that work is green with minimal cost

This skill is tool-agnostic. It produces verifiable checks and a cheap evaluation loop.

---

Principles

• Small and repeatable beats "big and rarely run".
• Prefer fast Tier 1 checks; reserve Tier 2/E2E for changes that demand it.
• Evals must be objective: either pass/fail or clearly measurable.

---

Outputs you must produce (minimum)

1. Acceptance criteria (2–5 items)
   Each AC must be verifiable. Avoid "works" or "seems fine".

2. Regression risk statement (1 paragraph)
   What could break, and what signal will catch it?

3. Evaluation loop

   • Tier 1: fastest check(s) you will run every time
   • Tier 2: when needed (integration/E2E or real environment)

---

AC templates (pick one; keep it short)

Bullet AC (default)

• AC1: ___ (how to verify)
• AC2: ___ (how to verify)

BDD-lite (when behavior is user-facing)

• Given ___
• When ___
• Then ___ (verifiable)

---

"Golden signals" checklist (cheap)

Pick the smallest set that fits:

• Integrity: static checks (lint/parse/schema)
• Behavior: one targeted scenario (manual or scripted)
• Regression: verify one previously failing bug stays fixed

---

Anti-patterns

• Writing evals that are too slow to run
• Treating logs as proof without a pass/fail signal
• Adding evals without documenting when to run them