ClaudSkills / Science & Research / math-stats

Annotate Spans

Q: What is a Claude Code skill and how does the Annotate Spans 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. Annotate Spans 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: 2026-07-23

type:review type:debug

Write effective, consistent annotations on LLM/agent spans and traces, and coach the user on annotation practice. Load this whenever you are about to record structured feedback with the `batch_span_annotate` tool, or when the user asks how to annotate, label, score, or review spans/traces, build a failure taxonomy, or set up human/LLM review. Do NOT load for: pure analysis with no intent to save feedback (use debug-trace), latency or cost statistics, or prompt authoring (use playground).

Security AStatic scan found no risk patternsHow grading works ›

From the source SKILL.md

An annotation is durable, structured feedback attached to a span or trace: a name (the dimension being judged), an optional label and/or score (the outcome), and an explanation (why). Annotations are not throwaway commentary — they accumulate into a dataset the user filters, aggregates, and iterates against.

What this skill does

Annotate Spans 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/annotate-spans/ and loads when your prompt matches the skill's trigger.

Who uses this skill

The Annotate Spans 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 161,000+ 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/annotate-spans
curl -L https://claudskills.com/skills/annotate-spans/SKILL.md \
  -o ~/.claude/skills/annotate-spans/SKILL.md

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

Skills live at ~/.claude/skills/annotate-spans/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\annotate-spans\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 Annotate Spans Claude Code skill?

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

What does the Annotate Spans 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 Annotate Spans skill?

Use Annotate Spans 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 Annotate Spans" or describe the task and let Claude pick). Browse related skills at /category/science/.

What is a Claude Code skill and how does the Annotate Spans 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. Annotate Spans 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/Arize-ai/phoenix/blob/HEAD/src/phoenix/server/agents/prompts/skills/annotate-spans/SKILL.md
Author: Arize-ai
Website: https://arize.com/docs/phoenix

Cite this skill

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

APA

Arize-ai. (2026). Annotate Spans [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/annotate-spans/

BibTeX

@misc{annotate-spans-2026,
  author    = {Arize-ai},
  title     = {Annotate Spans [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/annotate-spans/}
}

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

[![ClaudSkills](https://claudskills.com/badge/annotate-spans.svg)](https://claudskills.com/skills/annotate-spans/?utm_source=badge&utm_medium=readme&utm_campaign=skill_badge)

Security scan

Grade A · scanned 2026-07-26 — free static scan against the OWASP Agentic Skills Top 10.

No risk patterns were found in any of the ten OWASP-aligned categories. How grading works ›

✓ Prompt injection
✓ Data exfiltration
✓ Supply chain
✓ Reverse shell
✓ Credentials
✓ Execution
✓ Filesystem
✓ Persistence
✓ Obfuscation
✓ Network

Show this grade on your repo (click to copy):

[![Security: A](https://img.shields.io/badge/Security-A-2e7d32)](https://claudskills.com/skills/annotate-spans/#security)

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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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