tester

tester is a skill for Claude Code from mrstroz/claude-code-plugins. It costs 421 tokens per session (3,703 once invoked), scanned A, original, no licence file.

A tester role for a three-agent Claude Code team that independently turns acceptance criteria into scenarios, tests, and reproductions.

In plain words
What is it for?
Use it to write tests and bug reproductions in parallel with the implementation and verify the result from its own files.
Why use it?
Independent checking can reveal whether the implementation meets its stated requirements rather than relying only on the person who wrote it.

Skill for Claude Code

Written for Claude Code: argument-hint in frontmatter.

Part of the pair plugin — 4 skills shipped together

Good fit Use it to write tests and bug reproductions in parallel with the implementation and verify the result from its own files.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/mrstroz/claude-code-plugins/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.

Any agent
npx skills add mrstroz/claude-code-plugins --skill tester
Clone the repo
git clone --depth 1 https://github.com/mrstroz/claude-code-plugins

Made for: Claude Code.

Or install pair, the plugin that ships this one along with the rest of its 4 skills.

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 tester

README.md
[![agentmods](https://agentmods.dev/badge/skills/mrstroz/claude-code-plugins/tester/github.svg)](https://agentmods.dev/skills/mrstroz/claude-code-plugins/tester)
Your own site
<a href="https://agentmods.dev/skills/mrstroz/claude-code-plugins/tester"><img src="https://agentmods.dev/badge/skills/mrstroz/claude-code-plugins/tester/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.

agentmods 80×15 button for tester

Your own site · 80×15
<a href="https://agentmods.dev/skills/mrstroz/claude-code-plugins/tester"><img src="https://agentmods.dev/badge/skills/mrstroz/claude-code-plugins/tester.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 421 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,703 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 unknown 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 $0.00421 $0.03703
Opus 5 $0.00211 $0.01852
Sonnet 5 $0.00084 $0.00741
Haiku 4.5 $0.00042 $0.00370

Measured yesterday against content hash 2a2fd346d94d, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

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 yesterday.

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.

pair/skills/tester/SKILL.md · 83 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

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. yesterday Changed · +13 lines · +64 tokens per session 2a2fd346d94d
  2. 3d ago First seen · 70 lines · 357 tokens per session scan A 72631a7e1ab9

Subscribe to this mod's changes

tester is a skill published in the GitHub repository mrstroz/claude-code-plugins (3 stars, last pushed yesterday), with no licence file. It adds 421 tokens to every session and 3,703 once invoked, about $0.0021 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 2026-09-09.

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