Slash Command

Skills Eval

Audit skill quality, frontmatter compliance, token efficiency, and activation reliability. Recommends improvements.

Type: Slash Command
Repository: athola/claude-night-market
GitHub stars: 339
License: MIT
Repo last updated: Sep 24, 2026
Source file: plugins/abstract/commands/skills-eval.md

What Skills Eval is

Skills Eval is a slash command published in the athola/claude-night-market repository on GitHub, which has about 339 stars. The repository describes itself as: “23 Claude Code plugins: TDD enforcement hooks, git/PR workflows, spec-driven development, code review, project lifecycle, fix-from-error, maintenance automation, context optimization, research, and multi-LLM delegation. 186 skills, 128 commands, 54 agents.”

A slash command is a reusable prompt saved as a markdown file and run by typing its name after a slash. In Claude Code, custom commands have been merged into skills: a file in .claude/commands/ and a skill folder in .claude/skills/ both create the same kind of command, and existing command files keep working.

Skills Eval gives you a repeatable way to run the same instructions without retyping them, optionally with arguments.

How to install Skills Eval

Claude Code

Download skills-eval.md from the repository.
Save it to ~/.claude/commands/ (all projects) or .claude/commands/ (one project). As a skill, you can instead save it as ~/.claude/skills/<name>/SKILL.md.
Run it by typing / followed by its name.

Claude Cowork

Turn the command into a skill: create a folder with the file saved as SKILL.md and zip it.
In Customize → Skills, click +, then upload the ZIP.
Run it from any task with / and the skill name.

New to extending Cowork? Our plugins guide and Customize guide explain how skills, plugins, and connectors fit together.

Inside the source file

An excerpt from plugins/abstract/commands/skills-eval.md, shared under the repository's MIT license. Read the full file on GitHub.

Invoke Skill(abstract:skills-eval), which carries the evaluation criteria, the workflow and the output format across its modules.

When To Use

Use this command when you need to:

Auditing skill ecosystem quality
Discovering implementation patterns
Planning skill improvements
Checking compliance with standards
Generating improvement recommendations

When NOT To Use

Avoid this command if:

Evaluating hooks - use /hooks-eval instead
Validating plugin structure - use /validate-plugin instead
Creating new skills - use /create-skill instead

Usage

Evaluates all Claude Skills in your ~/.claude/ ecosystem for quality, compliance, and potential improvements.

Basic Usage

/prompt:skills-eval

Evaluates all discovered skills and generates improvement recommendations.

Specific Skill Evaluation

/prompt:skills-eval <skill-name>

Evaluates a specific skill (e.g., /prompt:skills-eval modular-skills).

Examples

/prompt:skills-eval
# Evaluates all 50+ skills, identifies 5 critical issues and 20+ improvements

/prompt:skills-eval modular-skills
# Deep dive on specific skill with detailed improvement plan

Integration with Tools

This command uses the skills-eval skill's specialized tools:

skills-auditor: Quality analysis
improvement-suggester: Actionable recommendation generation
compliance-checker: Standards and security validation

This evaluation validates an efficient skills ecosystem that follows Claude Skills best practices.

Before you install

Read the whole file first. Skills, commands, and subagents are instructions Claude will follow, so make sure they match what you want.
Check which tools, scripts, or MCP servers it uses. Local servers and scripts run with your permissions.
Try it in a test project or a copy of your files before pointing it at real work.
Pin the version you tested, and review changes before updating.
Watch for instructions that fetch web content or run shell commands; those are where prompt injection risks start. See our prompt injection guide.

FAQ

What is Skills Eval?

Skills Eval is a slash command for Claude Code and Claude Cowork from the athola/claude-night-market repository on GitHub. Audit skill quality, frontmatter compliance, token efficiency, and activation reliability. Recommends improvements.

How do I install Skills Eval in Claude Code?

Download skills-eval.md from the repository. Save it to ~/.claude/commands/ (all projects) or .claude/commands/ (one project). As a skill, you can instead save it as ~/.claude/skills/<name>/SKILL.md. Run it by typing / followed by its name.

Can I use Skills Eval in Claude Cowork?

Turn the command into a skill: create a folder with the file saved as SKILL.md and zip it. In Customize → Skills, click +, then upload the ZIP. Run it from any task with / and the skill name.

Is Skills Eval safe to install?

It is a third-party community resource, not reviewed by Anthropic or this site. Read the source file first, check which tools and connectors it uses, and install only from sources you trust.

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Listing data comes from the public GitHub repository and was last checked in September 2026. Excerpts are © their authors and shared under MIT. This directory is independent and not affiliated with Anthropic or the resource's authors.