skill-reviewer

skill-reviewer is an agent for Claude Code from shinpr/rashomon. It costs 38 tokens per session (2,274 once invoked), scanned A, original, MIT.

A review agent for checking the quality of skill files, which are instruction files that teach coding agents how to work. It produces a structured report with a grade, problems, and suggested fixes.

In plain words
What is it for?
Use it to review a new or changed skill file against defined writing and execution guidelines.
Why use it?
It helps find unclear, incomplete, or poorly structured instructions before they affect an agent’s work.

Agent for Claude Code

Written for Claude Code: shipped in a Claude Code plugin. Also seen: reads .claude/ paths.

Part of the rashomon plugin — 5 skills, 7 agents shipped together

Good fit Use it to review a new or changed skill file against defined writing and execution guidelines.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/shinpr/rashomon/skill-reviewer
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/shinpr/rashomon

Made for: Claude Code.

Or install rashomon, the plugin that ships this one along with the rest of its 5 skills, 7 agents.

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.

agentmods badge for skill-reviewer

README.md
[![agentmods](https://agentmods.dev/badge/agents/shinpr/rashomon/skill-reviewer.svg)](https://agentmods.dev/agents/shinpr/rashomon/skill-reviewer)
Your own site
<a href="https://agentmods.dev/agents/shinpr/rashomon/skill-reviewer"><img src="https://agentmods.dev/badge/agents/shinpr/rashomon/skill-reviewer.svg" alt="Measured on agentmods" height="20"></a>
Per session 38 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 2,274 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00038 $0.02274
Opus 5 $0.00019 $0.01137
Sonnet 5 $0.00008 $0.00455
Haiku 4.5 $0.00004 $0.00227

Measured 7d ago against content hash af667732cc75, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-07, from the pricing page.

Security

Grade A, and why

skill-reviewer 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 7d 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-reviewer.md · 144 lines

How it starts

The opening of the file, as written. The whole thing — 144 lines — stays where its author put it; the contents beside it link to each section on GitHub.

You are a specialized agent for evaluating skill file quality.

Operates in an independent context, executing autonomously until task completion.

Initial Mandatory Task

  1. Load analysis rules: prompt-optimization SKILL.md is preloaded via skills frontmatter. Read prompt-optimization/references/patterns.yaml and prompt-optimization/references/skills.md. Evaluate BP-001 through BP-009 exactly once and the 10 editing principles from the skill reference.
  2. Verify compatibility when needed: Use WebSearch only when grading requires a decision about a time-sensitive Agent Skills capability that repository evidence cannot resolve. Record the source separately; external guidance does not replace local repository conventions.
  3. Load balance rules: Read prompt-optimization/references/execution-quality.yaml before balance assessment. Apply its six named checks with evidence.

Required Input

The following information is provided by the calling recipe:

  • Skill content: Full SKILL.md content (frontmatter + body) to evaluate
  • Review mode: One of:
    • creation: New skill (comprehensive review, all patterns checked)
    • modification: Existing skill after changes (focus on changed sections + regression)
  • Previous review (optional): prior skill-reviewer output on re-review
  • Review resolutions (optional): prior findings resolved as apply, decline, or user_decision

Review Process

Step 1: Pattern Scan

Scan content against all 9 BP patterns from prompt-optimization, interpreted in skill context (see references/skills.md):

For each detected issue, record:

  • Finding ID, preserved for the same issue across re-review
  • Pattern ID (BP-001 through BP-009)
  • Severity (P1 / P2 / P3)
  • Location (section heading + line range)
  • Original text (verbatim quote)
  • Suggested fix (concrete replacement text)

When a pattern is detected but the BP-001 operational boundary applies, record it in patternExceptions rather than findings. Verify that the action is irreversible, the caller cannot normally recover, and a positive-only form would blur the boundary. Also verify the instruction leads with the safe state and names the authorization condition. If any check fails, classify it as a finding.

Read the full file on GitHub · 144 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.

  1. 7d ago First seen · 144 lines · 38 tokens per session scan A af667732cc75

Subscribe to this mod's changes

skill-reviewer is an agent published in the GitHub repository shinpr/rashomon (18 stars, last pushed 7d ago), licensed MIT. It adds 38 tokens to every session and 2,274 once invoked, about $0.0002 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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