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Evaluators

Category: Science & Research  ·  Sub-category: science-misc  ·  Last updated:
ai:llmtype:debug
Author or refine a Phoenix evaluator — code or LLM-as-a-judge — that scores a run's output. Trigger when the user wants to create a new evaluator, improve an existing one's logic or rubric, choose labels, or decide what to measure on a dataset or experiment. Do NOT trigger on: (1) manual prompt drafting (use `playground`), (2) running or comparing experiments themselves (use `experiments`), (3) cross-trace failure diagnosis with no evaluator in scope (use `debug-trace`).
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From the source SKILL.md

A Phoenix evaluator scores a run: it reads some subset of the run's input, output, reference, and metadata and returns named annotations — a label, a score, or both. The two artifact kinds — a code evaluator (a Python or TypeScript function) and an LLM evaluator (a judge prompt sent to a model) — share the loop and discipline below; judgment structure follows task need and environment capability, not artifact kind. The experiments skill reads the scores you design here; the explanations you enable are its evidence channel when comparing runs.

What this skill does

Evaluators is a community-contributed Claude Code skill in the science-misc sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/evaluators/ and loads when your prompt matches the skill's trigger.

Who uses this skill

The Evaluators 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 213,000+ 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/evaluators
curl -L https://claudskills.com/skills/evaluators/SKILL.md \
  -o ~/.claude/skills/evaluators/SKILL.md

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

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

Telegram

📱 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 Evaluators Claude Code skill?
Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/evaluators/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.
What does the Evaluators skill do?
Author or refine a Phoenix evaluator — code or LLM-as-a-judge — that scores a run's output. Trigger when the user wants to create a new evaluator, improve an existing one's logic or rubric, choose labels, or decide what to measure on a dataset or experiment. Do NOT trigger on: (1) manual prompt drafting (use `playground`), (2) running or comparing experiments themselves (use `experiments`), (3) cross-trace failure diagnosis with no evaluator in scope (use `debug-trace`).
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 Evaluators skill?
Use Evaluators when your Claude Code task falls under the Science & Research category — specifically in the science misc 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 Evaluators" or describe the task and let Claude pick). Browse related skills at /category/science/.
What is a Claude Code skill and how does the Evaluators 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. Evaluators 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

Cite this skill

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

APA
Arize-ai. (2026). Evaluators [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/evaluators/
BibTeX
@misc{evaluators-2026,
  author    = {Arize-ai},
  title     = {Evaluators [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/evaluators/}
}

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More Science & Research skills

Browse all Science & Research skills in the ClaudSkills registry, or explore these other picks from the same category:

Browse all Science & Research skills → Top 100 skills
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