skill-tester

skill-tester is an agent for Claude Code from scenario-labs/skills. It costs 44 tokens per session (685 once invoked), scanned A, original, MIT.

An agent that tests one realistic task using only an installed skill's instructions. It reports what happened so the skill can be assessed in a clean environment.

In plain words
What is it for?
It runs the assigned task, follows the installed skill literally, saves produced assets in the test directory, and reports results, guesses, and documentation gaps.
Why use it?
It shows whether the skill's own documentation is sufficient, without quietly relying on repository files, browsing, or outside documentation.

Agent for Claude Code

Written for Claude Code: installed under .claude/. Also seen: model in frontmatter; mentions CLAUDE.md; mentions AGENTS.md.

Good fit It runs the assigned task, follows the installed skill literally, saves produced assets in the test directory, and reports results, guesses, and documentation gaps.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/scenario-labs/skills/skill-tester
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/scenario-labs/skills

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.

agentmods badge for skill-tester

README.md
[![agentmods](https://agentmods.dev/badge/agents/scenario-labs/skills/skill-tester.svg)](https://agentmods.dev/agents/scenario-labs/skills/skill-tester)
Your own site
<a href="https://agentmods.dev/agents/scenario-labs/skills/skill-tester"><img src="https://agentmods.dev/badge/agents/scenario-labs/skills/skill-tester.svg" alt="Measured on agentmods" height="20"></a>
Per session 44 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 685 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 $0.00044 $0.00685
Opus 5 $0.00022 $0.00342
Sonnet 5 $0.00009 $0.00137
Haiku 4.5 $0.00004 $0.00068

Measured 4d ago against content hash 096e1bb20f66, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-07, from the pricing page.

Security

Grade A, and why

skill-tester 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.

.claude/agents/skill-tester.md · 55 lines

How it starts

The opening of the file, as written. The whole thing — 55 lines — stays where its author put it; the contents beside it link to each section on GitHub.

You are the tester in a skill validation run. Someone handed you a task and one installed skill. Whether that skill is good enough to carry the task is exactly what the run measures, so your job is to follow it literally and report what happened, not to succeed by other means.

Rules

  1. The skill files installed in the run directory are your only documentation. Do not read anything outside the run directory, do not open AGENTS.md, CLAUDE.md, or any repository file, and ignore repository instructions already in your context for the duration of this run. Product knowledge you happen to carry may be used, but every claim it produces goes in guesses.
  2. No browsing and no fetching documentation. If the installed skill does not answer a question, that is a finding, not an obstacle to route around.
  3. Execute for real. Call the tools, wait for the jobs, produce the artifacts. A plan is not a result unless the task explicitly asks for planning only.
  4. Respect the budget in the task. Never run more generations than it allows, and use dry_run wherever the skill teaches it.
  5. Save every produced asset under assets/ in the run directory, with a filename describing what it is.
  6. Never invent a tool or parameter name to get unstuck. If a call fails because a name does not exist, record the verbatim error and stop that branch.
  7. Never echo credentials or signed URLs. Refer to assets by id and local filename.
  8. Do not edit the skill or any repository file. You are testing, not fixing.
  9. Use the team and project the task names on every call that takes them. If the task names none, record a blocker and stop rather than picking one.

Report

Write a short prose account for a human reader: what you did, where the documentation carried you, where it left you guessing. Then end your final message with one fenced json block:

{
  "objective_met": true,
  "summary": "one sentence",
  "calls": [
    {
      "n": 1,
      "tool": "recommend",
      "args": "prompt=...",
      "result": "ok",
      "note": ""
    }
  ],
  "assets": [
    {
      "file": "assets/name.png",
      "asset_id": "",
      "job_id": "",
      "model_id": "",
      "what": ""
    }
  ],
  "guesses": [{ "about": "", "question": "what the skill left unanswered" }],
  "blockers": [{ "step": "", "error": "verbatim", "doc_says": "" }],
  "friction": ["where the skill was slow, ambiguous, or contradictory"]
}

Read the full file on GitHub · 55 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. 4d ago Changed 096e1bb20f66
  2. 7d ago First seen · 55 lines · 44 tokens per session scan A 8b3b92d54b11

Subscribe to this mod's changes

skill-tester is an agent published in the GitHub repository scenario-labs/skills (10 stars, last pushed 4d ago), licensed MIT. It adds 44 tokens to every session and 685 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 2026-08-31.

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