copywriter

A writing guide for user-facing text in websites, applications, product descriptions, documentation, and marketing materials.

In plain words
What is it for?
Writing buttons, error messages, empty states, onboarding text, tooltips, landing-page copy, feature descriptions, emails, and release notes.
Why use it?
It helps replace vague or technical wording with clear text that tells people what an action does and what result to expect.

Skill for Claude CodeCodex

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/luizedupp/rememb/copywriter
Any agent
npx skills add LuizEduPP/Rememb --skill copywriter
Clone the repo
git clone --depth 1 https://github.com/LuizEduPP/Rememb

Made for: Claude Code, Codex.

Per session 40 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,364 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 $0.00040 $0.03364
Opus 5 $0.00020 $0.01682
Sonnet 5 $0.00008 $0.00673
Haiku 4.5 $0.00004 $0.00336

Measured 2d ago against content hash ee838479f559, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

copywriter 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 2d 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.

src/rememb_skills/copywriter/SKILL.md · 641 lines

How it starts

The opening of the file, as written. The whole thing — 641 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Copywriter

Overview

Use this skill to write clear, persuasive copy for product surfaces, marketing assets, and user-facing flows.

UX Writing:

  • Button labels, form fields, error messages
  • Empty states, onboarding flows
  • Tooltips, help text
  • Confirmation dialogs

Marketing Copy:

  • Landing pages, hero sections
  • Feature descriptions
  • Call-to-action (CTA) buttons
  • Email campaigns

Product Content:

  • Product descriptions
  • Feature announcements
  • Release notes
  • Documentation

UX Writing Patterns

Button Labels

// ❌ Bad: Vague, passive
<Button>Submit</Button>
<Button>OK</Button>
<Button>Click Here</Button>

// ✅ Good: Specific, action-oriented
<Button>Create Account</Button>
<Button>Save Changes</Button>
<Button>Start Free Trial</Button>

Guidelines:

  • Use verb + noun ("Save Changes" not "Save")
  • Be specific ("Delete Post" not "Delete")
  • Show outcome ("Start Free Trial" not "Submit")

Error Messages

// ❌ Bad: Technical, blaming user
"Invalid input"
"Error 422: Unprocessable Entity"
"You entered the wrong password"

// ✅ Good: Helpful, actionable
"Please enter a valid email address"
"We couldn't find an account with that email"
"Password must be at least 8 characters"

// Implementation
function PasswordInput() {
  const [error, setError] = useState('')

  const validate = (password: string) => {
    if (password.length < 8) {
      setError('Password must be at least 8 characters')
    } else if (!/[A-Z]/.test(password)) {
      setError('Password must include at least one uppercase letter')
    } else if (!/[0-9]/.test(password)) {
      setError('Password must include at least one number')
    } else {
      setError('')
    }
  }

  return (
    <div>
      <input type="password" onChange={(e) => validate(e.target.value)} />
      {error && <p className="text-red-600">{error}</p>}
    </div>
  )
}

Error Message Formula:

  1. What happened
  2. Why it happened (optional)
  3. How to fix it

Read the full file on GitHub · 641 lines

Files

What ships with it

2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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. 2d ago First seen · 641 lines · 40 tokens per session scan A ee838479f559

Subscribe to this mod's changes

copywriter is a skill published in the GitHub repository LuizEduPP/Rememb (4 stars, last pushed 1mo ago), licensed MIT. It adds 40 tokens to every session and 3,364 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.