ClaudSkills / General / education-learning

Promptfoo Evals

Q: What is a Claude Code skill and how does the Promptfoo Evals skill fit in?

A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Promptfoo Evals is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the General category. Learn more at https://claudskills.com/learn/what-is-skill-md/.

Category: General · Sub-category: education-learning · Last updated: 2026-05-30

Write, refine, run, and QA promptfoo evaluation suites: promptfooconfig.yaml, prompts, providers, vars, tests, assertions, model-graded rubrics, transforms, datasets, exports, and CI gates. Use for non-redteam eval coverage, regression tests, or new eval matrices. Do not use for adversarial redteam plugin or strategy setup.

From the source SKILL.md

You produce maintainable promptfoo eval suites: clear test cases, deterministic assertions where possible, model-graded only when needed.

What this skill does

Promptfoo Evals is a community-contributed Claude Code skill in the education-learning sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/promptfoo-evals/ and loads when your prompt matches the skill's trigger.

Who uses this skill

The Promptfoo Evals Claude Code skill is built for Claude Code users and developers across all disciplines looking for general-purpose AI assistance. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 76,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/promptfoo-evals
curl -L https://claudskills.com/skills/promptfoo-evals/SKILL.md \
  -o ~/.claude/skills/promptfoo-evals/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/promptfoo-evals/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/promptfoo-evals/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\promptfoo-evals\SKILL.md on Windows. See the full install guide for step-by-step instructions.

Pro

One-click install via the desktop app

The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.

Pro

For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.

See pricing → Download desktop app

Frequently asked questions

How do I install the Promptfoo Evals Claude Code skill?

Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/promptfoo-evals/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.

What does the Promptfoo Evals skill do?

Is this skill free to install?

Yes. ClaudSkills is an open registry — every skill keeps its source repository's license, and manual install via copy is free. ClaudSkills Pro ($9/mo, $79/yr, or $149 one-time) adds one-click install via the desktop app and a multi-signal Quality Score.

When should I use the Promptfoo Evals skill?

Use Promptfoo Evals when your Claude Code task falls under the General category — specifically in the education learning area. Claude Code auto-discovers installed skills and invokes the right one based on the task description, so you can also ask Claude directly (e.g. "use Promptfoo Evals" or describe the task and let Claude pick). Browse related skills at /category/general/.

What is a Claude Code skill and how does the Promptfoo Evals skill fit in?

A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Promptfoo Evals is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the General category. Learn more at /learn/what-is-a-claude-skill/.

Attribution & license

Source: https://github.com/promptfoo/promptfoo/blob/HEAD/.claude/skills/promptfoo-evals/SKILL.md
License: MIT
Author: promptfoo
Website: https://promptfoo.dev

Cite this skill

If you reference this skill in a blog post, paper, or documentation, you can cite it as:

APA

promptfoo. (2026). Promptfoo Evals [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/promptfoo-evals/

BibTeX

@misc{promptfoo-evals-2026,
  author    = {promptfoo},
  title     = {Promptfoo Evals [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/promptfoo-evals/}
}

Embed this skill

Promote, attribute, or link this skill from your own README, blog post, or documentation. All three snippets are free to use — no sign-up, no API key. More distribution surfaces →

Badge

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Part of ClaudSkills — the open registry for Claude Skills & Claude Code Skills. · What's New · Install guide · About · llms.txt

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