Borrowing it
Nothing to install: this file belongs to joaquimscosta/arkhe-claude-plugins. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/joaquimscosta/arkhe-claude-plugins/main/.claude/skills/skill-validator/SKILL.mdgit clone --depth 1 https://github.com/joaquimscosta/arkhe-claude-pluginsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/joaquimscosta/arkhe-claude-plugins/skill-validator)<a href="https://agentmods.dev/skills/joaquimscosta/arkhe-claude-plugins/skill-validator"><img src="https://agentmods.dev/badge/skills/joaquimscosta/arkhe-claude-plugins/skill-validator/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/joaquimscosta/arkhe-claude-plugins/skill-validator"><img src="https://agentmods.dev/badge/skills/joaquimscosta/arkhe-claude-plugins/skill-validator.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00079 | $0.00708 |
| Opus 5 | $0.00039 | $0.00354 |
| Sonnet 5 | $0.00016 | $0.00142 |
| Haiku 4.5 | $0.00008 | $0.00071 |
Grade A, and why
skill-validator scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 9d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 88 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Skill Validator
Run automated checks against 62 rules covering frontmatter, structure, content, files, references, security, hooks, and MCP.
Quick Start
scripts/validate_skill.py /path/to/skill-directory
With severity filter:
scripts/validate_skill.py /path/to/skill --min-severity warning
Validation Categories
| Category | Rules | Checks |
|---|---|---|
| Frontmatter | FM001-FM018 | Required fields, naming, description, context/agent, maxTurns, memory, disable-model-invocation |
| Structure | SS001-SS006 | Line limits, progressive disclosure |
| Content | CW001-CW009 | Writing style, terminology, string substitution, dynamic context injection, ultrathink |
| Files | FO001-FO007 | Naming conventions, forbidden files |
| References | RI001-RI003 | Broken links, orphan files |
| Security | SC001-SC005 | eval/exec, undocumented constants |
| Hooks | HK001-HK003 | Hook structure, handler format, matcher format |
| MCP | MC001 | MCP server configuration format |
Severity Levels
| Level | Action |
|---|---|
| CRITICAL | Must fix before publishing |
| ERROR | Should fix |
| WARNING | Consider fixing |
| SUGGESTION | Optional improvement |
Output Example
=== Skill Validation Report: my-skill ===
Summary: 0 critical, 1 error, 2 warnings, 1 suggestion
[ERROR] SS002: SKILL.md exceeds 500 lines (523 lines)
Location: SKILL.md
Fix: Split content into WORKFLOW.md, EXAMPLES.md, TROUBLESHOOTING.md
[WARNING] CW001: Second-person language detected
Location: SKILL.md:45
Found: "You should create..."
Fix: Use imperative: "Create..."
Command Options
--min-severity {critical,error,warning,suggestion} # Filter output
--format {text,json} # Output format
--ignore RULE1,RULE2 # Skip specific rules
Common Issues
"False positive on second-person"
- Context-appropriate "you" may be acceptable
- Use
--ignore CW001to suppress
What ships with it
4 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 9d ago First seen · 88 lines · 79 tokens per session scan A 86a805c8e15a
skill-validator is a skill published in the GitHub repository joaquimscosta/arkhe-claude-plugins (21 stars, last pushed 25d ago), licensed MIT. It adds 79 tokens to every session and 708 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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