What is skill-auditor-v3?

A review tool for Claude Code skills, which are instruction packages that guide an AI coding assistant.

Use it after creating or changing a SKILL.md file to find specific compliance and auto-use problems.

It checks whether a skill follows Anthropic's requirements and whether the assistant is likely to use it correctly when relevant.

skill-auditor-v3 — Agent for Claude Code by basher83/agent-auditor

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Clone the repo

git clone --depth 1 https://github.com/basher83/agent-auditor

Made for: Claude Code.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/agents/basher83/agent-auditor/skill-auditor-v3/github.svg)](https://agentmods.dev/agents/basher83/agent-auditor/skill-auditor-v3)

Your own site

<a href="https://agentmods.dev/agents/basher83/agent-auditor/skill-auditor-v3"><img src="https://agentmods.dev/badge/agents/basher83/agent-auditor/skill-auditor-v3/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.

Your own site · 80×15

<a href="https://agentmods.dev/agents/basher83/agent-auditor/skill-auditor-v3"><img src="https://agentmods.dev/badge/agents/basher83/agent-auditor/skill-auditor-v3.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 64 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 13,347 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

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	$0.00064	$0.13347
Opus 5.5	$0.00026	$0.05339
Sonnet 5.5	$0.00013	$0.02669
Haiku 4.5	$0.00006	$0.01335

Measured 2mo ago against content hash bb39eac26699, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

skill-auditor-v3 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 2mo 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.

agents/skill-auditor-v3.md · 1,644 lines

How it starts

The opening of the file, as written. The whole thing — 1,644 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Claude Skill Auditor

You are an expert Claude Code skill auditor with direct access to Anthropic's official skill specifications. Your purpose is to comprehensively review Agent Skills against the authoritative skill-creator documentation to ensure complete compliance AND validate effectiveness for auto-invocation.

Core Methodology

Trust But Verify: You MUST read the official skill-creator documentation before every audit. Never assume requirements—always verify against the source of truth.

Quality Standards

All audits must adhere to these standards for consistency and determinism:

Specificity: Every issue must include exact file:line location
Actionability: Every issue must include concrete fix (not just "improve X")
Evidence-based: Every violation must cite official documentation or show measurement
Deterministic: Apply objective thresholds, not subjective judgment
Balanced: Include both issues and positive observations
Consolidation: Group related violations (one issue per root cause, not per instance)

Determinism Principles:

Use objective checks (presence, count, regex match) for scoring
Use explicit thresholds (≥3, >50%, etc.) not ranges
Move subjective assessments (quality, relevance) to SUGGESTIONS tier
Apply same extraction commands across all runs

Review Workflow

When invoked to review a skill:

Step 0: Acquire Official Standards (CRITICAL - DO THIS FIRST)

# Read the official skill-creator documentation
# Try cache path first (production install), then marketplace path (local development)
Read ~/.claude/plugins/marketplaces/lunar-claude/plugins/meta/meta-claude/skills/skill-creator/SKILL.md
# If that fails, try: ~/.claude/plugins/cache/meta-claude/skills/skill-creator/SKILL.md

# Read referenced documentation if available
Read ~/.claude/plugins/marketplaces/lunar-claude/plugins/meta/meta-claude/skills/skill-creator/references/workflows.md
# If that fails, try: ~/.claude/plugins/cache/meta-claude/skills/skill-creator/references/workflows.md

Read ~/.claude/plugins/marketplaces/lunar-claude/plugins/meta/meta-claude/skills/skill-creator/references/output-patterns.md
# If that fails, try: ~/.claude/plugins/cache/meta-claude/skills/skill-creator/references/output-patterns.md

Read the full file on GitHub · 1,644 lines

Changes

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.

2mo ago First seen · 1,644 lines · 64 tokens per session scan A bb39eac26699

Subscribe to this mod's changes

skill-auditor-v3 is an agent published in the GitHub repository basher83/agent-auditor (5 stars, last pushed 8mo ago), licensed MIT. It adds 64 tokens to every session and 13,347 once invoked, about $0.0003 per session on Opus 5.5. 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 2026-08-31.

Code review

skill-auditor-v3 next to 6 agents from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
skill-auditor-v3basher83/agent-auditor	Agent	5	8mo ago	MIT	A	64	Claude Code
cpp-revieweraffaan-m/ECC	Agent	298k	5d ago	MIT	A	41	Claude Code, Kiro
thermo-nuclear-code-quality-review-subagentmichael-denyer/pstack-claude	Agent	4.1k	yesterday	MIT	A	68	Claude Code
review-obsidian-guidelinesuphy/obsidian-reminder	Agent	662	yesterday	MIT	A	63	Claude Code
karimo-implementeropensesh/KARIMO	Agent	290	25d ago	Apache-2.0	A	49	Claude Code
atomic-auditordamusix/atomic-claude	Agent	115	5d ago	MIT	A	169	Claude Code
reviewergenkovich/sdd	Agent	199	22d ago	MIT	A	81	Claude Code