ClaudSkills / Science & Research / math-stats

Run Evals

Q: What is a Claude Code skill and how does the Run 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. Run Evals is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Science & Research category. Learn more at https://claudskills.com/learn/what-is-skill-md/.

Category: Science & Research · Sub-category: math-stats · Last updated: 2026-06-03

Run benchmark evaluations for any skill. Reads evals/evals.json from the target skill, spawns parallel with-skill and without-skill agent runs, grades outputs against assertions, aggregates benchmark statistics, and launches the eval viewer. Use when you want to measure or compare skill performance without entering the full skill-creator create/improve flow. Trigger on phrases like "run evals", "run the evals", "benchmark this skill", "run the eval loop", "test this skill against baseline", or when a skill has an evals.json and the user wants to see how it performs.

From the source SKILL.md

Runs the benchmarking eval loop for an existing skill. Extracted from skill-creator — use this when the skill already exists and you only need to measure it, not create or improve it.

What this skill does

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

When to invoke it: Use when you want to measure or compare skill performance without entering the full skill-creator create/improve flow. Trigger on phrases like "run evals", "run the evals", "benchmark this skill", "run the eval loop", "test this skill against baseline", or when a skill has an evals.

Who uses this skill

The Run Evals Claude Code skill is built for researchers, data scientists, academics, and analysts working with complex data and scientific literature. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 93,000+ 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/run-evals
curl -L https://claudskills.com/skills/run-evals/SKILL.md \
  -o ~/.claude/skills/run-evals/SKILL.md

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

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

📱 Install from your phone or desktop Telegram

Open @claudskills_bot on Telegram, tap Open Desktop App, and the desktop app installs this skill for you. Or share the bot link with a colleague — they get the same one-tap install. Learn more →

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 Run Evals Claude Code skill?

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

What does the Run 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 Run Evals skill?

Use Run Evals when your Claude Code task falls under the Science & Research category — specifically in the math stats 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 Run Evals" or describe the task and let Claude pick). Browse related skills at /category/science/.

What is a Claude Code skill and how does the Run 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. Run Evals is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Science & Research category. Learn more at /learn/what-is-a-claude-skill/.

Attribution & license

Source: https://gist.githubusercontent.com/eyalgo/fdd50d66ec9c1f38666bd82741927cf3/raw/d1dfc483486fff752703bc991018658491159e66/SKILL.md
Author: eyalgo

Cite this skill

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

APA

eyalgo. (2026). Run Evals [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/run-evals/

BibTeX

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

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Badge

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