eval-skill

eval-skill is a command for coding agents from Vibe-Marketer/plugins-and-skills. It costs 12 tokens per session (230 once invoked), scanned A, original, MIT.

A command for testing and benchmarking a skill with automated grading and comparisons. A skill is a reusable set of instructions that gives a coding agent a specialized way to work.

In plain words
What is it for?
Use it to choose a skill to evaluate, test specific aspects of its behavior, and compare the resulting outputs.
Why use it?
It helps reveal whether a skill produces the expected results and how its output compares across tests.

Command

Part of the create-plugins plugin — 12 skills, 6 commands, 9 agents 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 commands/vibe-marketer/plugins-and-skills/eval-skill
Clone the repo
git clone --depth 1 https://github.com/Vibe-Marketer/plugins-and-skills

Or install create-plugins, the plugin that ships this one along with the rest of its 12 skills, 6 commands, 9 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 eval-skill

README.md
[![agentmods](https://agentmods.dev/badge/commands/vibe-marketer/plugins-and-skills/eval-skill.svg)](https://agentmods.dev/commands/vibe-marketer/plugins-and-skills/eval-skill)
Your own site
<a href="https://agentmods.dev/commands/vibe-marketer/plugins-and-skills/eval-skill"><img src="https://agentmods.dev/badge/commands/vibe-marketer/plugins-and-skills/eval-skill.svg" alt="Measured on agentmods" height="20"></a>
Per session 12 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 230 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 $0.00012 $0.00230
Opus 5 $0.00006 $0.00115
Sonnet 5 $0.00002 $0.00046
Haiku 4.5 $0.00001 $0.00023

Measured 4d ago against content hash d0816fa2bc33, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

eval-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.

create-plugins/commands/eval-skill.md · 28 lines

What it actually says

If $ARGUMENTS is empty, ask the user which skill they want to evaluate and what aspects they want to test.

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 · 28 lines · 12 tokens per session scan A d0816fa2bc33

Subscribe to this mod's changes

eval-skill is a command published in the GitHub repository Vibe-Marketer/plugins-and-skills (2 stars, last pushed 6mo ago), licensed MIT. It adds 12 tokens to every session and 230 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.