Eval runs (evaluations/) ship spans to Logfire under service_name = 'evals'. This skill finds a run, surfaces its metrics and failures, and drills into a single case. Read-only.
Debug Evals is a community-contributed Claude Code skill in the observability sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/debug-evals/ and loads when your prompt matches the skill's trigger.
When to invoke it: Use when asked to look at Logfire for an eval run, find failing or low-scoring eval cases, compare runs, check citation quality (cited_map) or judge pass rate (answer_equivalent), or explain why an eval case failed. Drives the Logfire MCP against the `evals` service, or the Logfire HTTP query API when the MCP is not loaded.
The Debug Evals Claude Code skill is built for software engineers, backend developers, full-stack teams, and technical leads building and maintaining production systems. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 211,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).
mkdir -p ~/.claude/skills/debug-evals curl -L https://claudskills.com/skills/debug-evals/SKILL.md \ -o ~/.claude/skills/debug-evals/SKILL.md
Or just download SKILL.md directly and drop it into ~/.claude/skills/debug-evals/. Claude Code auto-discovers it on next session.
Skills live at ~/.claude/skills/debug-evals/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\debug-evals\SKILL.md on Windows. See the full install guide for step-by-step instructions.
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 →
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.
For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.
SKILL.md from the source repository to ~/.claude/skills/debug-evals/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.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. Debug Evals is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Engineering category. Learn more at /learn/what-is-a-claude-skill/.If you reference this skill in a blog post, paper, or documentation, you can cite it as:
@misc{debug-evals-2026,
author = {ggozad},
title = {Debug Evals [Claude Code skill]},
year = {2026},
publisher = {ClaudSkills},
url = {https://claudskills.com/skills/debug-evals/}
}Grade A · scanned 2026-10-25 — free static scan against the OWASP Agentic Skills Top 10.
The scan flagged 1 of 10 categories (filesystem), including lower-severity patterns. Patterns shown inside code fences are weighted as examples rather than instructions — read the grading methodology for what this does and does not guarantee.
Browse all Engineering skills in the ClaudSkills registry, or explore these other picks from the same category:
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SKILL.md files, not affiliated with, endorsed by, or sponsored by Anthropic.