ClaudSkills / Science & Research / math-stats

Forge Evals

Q: What is a Claude Code skill and how does the Forge 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. Forge 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: 2026-06-01

ai:llm

Designing evals for LLM features. Golden datasets, rubric scoring, LLM-as-judge calibration, regression detection in CI, online A/B tests, cost+latency budgets, adversarial cases. Contains paste-ready eval harness with promptfoo / vitest, judge prompt template. Use when shipping an LLM feature to production, not for one-shot experimentation.

From the source SKILL.md

You are shipping an LLM feature whose quality cannot be measured by a test suite. Default agent-written LLM apps go to production with zero evals; quality is "looks good." Then a prompt change two weeks later silently regresses the median output, nobody knows until users complain. This skill exists to put real numbers on subjective quality.

What this skill does

Forge 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/forge-evals/ and loads when your prompt matches the skill's trigger.

When to invoke it: Use when shipping an LLM feature to production, not for one-shot experimentation.

Who uses this skill

The Forge 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/forge-evals
curl -L https://claudskills.com/skills/forge-evals/SKILL.md \
  -o ~/.claude/skills/forge-evals/SKILL.md

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

Skills live at ~/.claude/skills/forge-evals/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\forge-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 Forge Evals Claude Code skill?

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

What does the Forge 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 Forge Evals skill?

Use Forge 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 Forge 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 Forge 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. Forge 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://github.com/f4rkh4d/forge-skill/blob/HEAD/skills/llm/forge-evals/SKILL.md
License: MIT
Author: f4rkh4d
Website: https://f4rkh4d.github.io/forge-skill/

Cite this skill

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

APA

f4rkh4d. (2026). Forge Evals [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/forge-evals/

BibTeX

@misc{forge-evals-2026,
  author    = {f4rkh4d},
  title     = {Forge Evals [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/forge-evals/}
}

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