evaluate-skill

evaluate-skill is a skill for Claude Code, Codex from ai-plugin-marketplace/template. It costs 16 tokens per session (475 once invoked), scanned A, original, MIT.

A procedure for testing an AI skill with hidden test cases across three model tiers: opus, sonnet, and haiku.

In plain words
What is it for?
Use it to run blind tests, compare outputs with expected outcomes, record pass or fail results, and identify the lowest tier that passes all cases.
Why use it?
It shows whether the skill is clear and reliable at different model levels without letting the tested agent see the expected answers.

Skill for Claude CodeCodex

Part of the skill-evaluator plugin — 1 skill, 1 command shipped together

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.

agentmods
npx agentmods add skills/ai-plugin-marketplace/template/evaluate-skill
Any agent
npx skills add ai-plugin-marketplace/template --skill evaluate-skill
Clone the repo
git clone --depth 1 https://github.com/ai-plugin-marketplace/template

Made for: Claude Code, Codex.

Or install skill-evaluator, the plugin that ships this one along with the rest of its 1 skill, 1 command.

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 evaluate-skill

README.md
[![agentmods](https://agentmods.dev/badge/skills/ai-plugin-marketplace/template/evaluate-skill.svg)](https://agentmods.dev/skills/ai-plugin-marketplace/template/evaluate-skill)
Your own site
<a href="https://agentmods.dev/skills/ai-plugin-marketplace/template/evaluate-skill"><img src="https://agentmods.dev/badge/skills/ai-plugin-marketplace/template/evaluate-skill.svg" alt="Measured on agentmods" height="20"></a>
Per session 16 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 475 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00016 $0.00475
Opus 5 $0.00008 $0.00237
Sonnet 5 $0.00003 $0.00095
Haiku 4.5 $0.00002 $0.00047

Measured 4d ago against content hash a72958959a4d, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

evaluate-skill 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 4d 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.

Origin

Copies of this mod

1 near-identical copy found in the catalogue:

plugins/skill-evaluator/skills/evaluate-skill/SKILL.md · 52 lines

What it actually says

Evaluate Skill

Orchestrate a cross-tier evaluation of an AI skill to determine its clarity and robustness.

Procedure

  1. Load inputs

    • Read the skill file at {{ skill-path }}
    • Read the test cases file at {{ test-cases-path }}
    • Validate that test cases is a JSON array of objects with input and expectedOutcome fields
  2. Set up evaluation matrix

    • Model tiers to test: opus, sonnet, haiku
    • For each tier, for each test case: plan one blind test run
  3. Execute blind tests (highest tier first)

    • For each model tier (opus → sonnet → haiku):
      • For each test case:
        • Spawn a test-subject agent at the current tier
        • Provide it ONLY the skill content and the test case input
        • Do NOT provide the expectedOutcome to the test subject
        • Collect the test subject's output
  4. Evaluate results

    • For each test run, compare the test subject's output against the expectedOutcome
    • Determine pass/fail using semantic similarity (the output need not be identical, but must achieve the same goal)
    • Record: tier, test case index, pass/fail, output summary
  5. Generate refinement report

    • Identify the lowest tier where all test cases pass ("clarity floor")
    • For each failure, analyze WHY the lower-tier agent failed:
      • Ambiguous instructions?
      • Missing context or assumptions?
      • Overly complex multi-step reasoning?
      • Implicit knowledge requirements?
    • Produce specific, actionable recommendations to improve the skill
    • Format as a structured report with sections: Summary, Per-Tier Results, Failure Analysis, Recommendations
  6. Output the report to the user

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. 4d ago First seen · 52 lines · 16 tokens per session scan A a72958959a4d

Subscribe to this mod's changes

evaluate-skill is a skill published in the GitHub repository ai-plugin-marketplace/template (10 stars, last pushed 2mo ago), licensed MIT. It adds 16 tokens to every session and 475 once invoked, about $0.0001 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 2026-08-31.

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