claude-copilot: Skill for Claude Code

.claude/skills/copywriting/litmus-test/SKILL.md

litmus-test is a skill for Claude Code from Everyone-Needs-A-Copilot/claude-copilot. It costs 87 tokens per session (777 once invoked), scanned A, original, MIT.

A creative review checklist for testing ideas, concepts, and messages against questions about distinctiveness, honesty, audience impact, and brevity. It is meant to expose generic or cautious thinking before the work is presented.

In plain words
What is it for?
Use it to challenge advertising concepts, creative briefs, product messages, and other early-stage ideas.
Why use it?
Ideas can sound polished while still being forgettable or interchangeable with a competitor's. The checklist highlights those weaknesses so they can be revised.

Skill for Claude Code

Written for Claude Code: when-to-use in frontmatter. Also seen: reads .claude/ paths.

This is Everyone-Needs-A-Copilot/claude-copilot's own configuration. It tells Claude Code how to work on claude-copilot itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything claude-copilot configures →

Part of the claude-copilot plugin — 72 skills, 17 commands, 16 agents, 6 hooks shipped together

Reuse

Borrowing it

Nothing to install: this file belongs to Everyone-Needs-A-Copilot/claude-copilot. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/Everyone-Needs-A-Copilot/claude-copilot/main/.claude/skills/copywriting/litmus-test/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/Everyone-Needs-A-Copilot/claude-copilot

Made for: Claude Code.

Or install claude-copilot, the plugin that ships this one along with the rest of its 72 skills, 17 commands, 16 agents, 6 hooks.

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 litmus-test

README.md
[![agentmods](https://agentmods.dev/badge/skills/everyone-needs-a-copilot/claude-copilot/litmus-test/github.svg)](https://agentmods.dev/skills/everyone-needs-a-copilot/claude-copilot/litmus-test)
Your own site
<a href="https://agentmods.dev/skills/everyone-needs-a-copilot/claude-copilot/litmus-test"><img src="https://agentmods.dev/badge/skills/everyone-needs-a-copilot/claude-copilot/litmus-test/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 litmus-test

Your own site · 80×15
<a href="https://agentmods.dev/skills/everyone-needs-a-copilot/claude-copilot/litmus-test"><img src="https://agentmods.dev/badge/skills/everyone-needs-a-copilot/claude-copilot/litmus-test.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 87 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 777 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. Third-party audits
  • NVIDIA SkillSpector pass 7 Sept 2026
How audits are shown
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 $0.00087 $0.00777
Opus 5 $0.00044 $0.00388
Sonnet 5 $0.00017 $0.00155
Haiku 4.5 $0.00009 $0.00078

Measured 4d ago against content hash aca36026bb42, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

litmus-test 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/skills/copywriting/litmus-test/SKILL.md · 72 lines

How it starts

The opening of the file, as written. The whole thing — 72 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Creative Direction Litmus Test

Apply to ALL ideas before presenting. If an idea fails any question, rework it before showing anyone.

The 5 Questions

  1. Would this make a room uncomfortable? If no — it's too soft. Safe ideas don't cut through. Discomfort signals you've said something true.

  2. Could a competitor say this? If yes — it's too generic. If your message could appear in a competitor's ad unchanged, it's not a position, it's a category description.

  3. Does it lead with outcome or process? If process — rethink. Users don't care how you do it. They care what changes for them. "We use AI" is process. "You get your evenings back" is outcome.

  4. Would we say this to someone's face? If no — it's bullshit. Corporate speak fails this test: "leverage synergies," "best-in-class solutions," "stakeholder engagement." If you wouldn't say it to a friend, don't say it to a customer.

  5. Can we cut 30% of the words? The answer is always yes. Every first draft has 30% that adds length without meaning. Find it and cut it.

Voice Reference: Authentic Provocateur

The voice that passes the Litmus Test:

  • Says what everyone's thinking but no one will voice
  • Honest, not harsh
  • Simple words, complex ideas
  • Short. Punchy. Direct.

Signature patterns:

  • "Stop debating and start executing"
  • "A strategy given is a strategy forgotten"
  • "Ship it now, perfect it never works either — ship it now, fix it fast"

Creative Brief Format

Use this structure when capturing approved creative direction:

The Challenge: [One paragraph reframing the problem — lead with user pain, not company goals]
The Insight: [The uncomfortable truth driving this concept]
The Idea: [Core concept in one sentence — make it uncomfortable]
How It Works: [Specific, not vague — what exactly happens]
Why It's Uncomfortable: [What conventions this challenges]
Why It Works: [Strategic rationale — business case, not aesthetics]

Anti-Generic Rules

  • NEVER accept the first framing of a brief — challenge it first
  • NEVER propose one safe, consensus option — always show 2–3 directions
  • NEVER lead with methodology ("We use a 4-step process...")
  • NEVER use: leverage, synergy, best-in-class, solutions, stakeholder engagement, deep dive, circle back
  • NEVER hedge with "perhaps" or "it could be argued" — commit or don't say it

Read the full file on GitHub · 72 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 First seen · 72 lines · 87 tokens per session scan A aca36026bb42

Subscribe to this mod's changes

litmus-test is a skill published in the GitHub repository Everyone-Needs-A-Copilot/claude-copilot (13 stars, last pushed today), licensed MIT. It adds 87 tokens to every session and 777 once invoked, about $0.0004 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 2026-09-04.

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