copy-editing

copy-editing is a skill for Claude Code from bromso/metapowers. It costs 70 tokens per session (592 once invoked), scanned A, original, MIT.

A line-by-line editing process for existing marketing copy. It improves clarity, persuasion, and consistency with a brand's voice while showing what changed and why.

In plain words
What is it for?
Use it on text from a page, email, or other marketing material. It is for improving an existing draft, not writing new copy or providing only a critique.
Why use it?
Draft copy can be unclear, repetitive, or out of step with a brand even when the underlying ideas are sound. This helps refine the words without starting from scratch.

Skill for Claude Code

Written for Claude Code: argument-hint in frontmatter.

Part of the marketing plugin — 29 skills shipped together

Good fit Use it on text from a page, email, or other marketing material. It is for improving an existing draft, not writing new copy or providing only a critique.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/bromso/metapowers/copy-editing
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 bromso/metapowers --skill copy-editing
Clone the repo
git clone --depth 1 https://github.com/bromso/metapowers

Made for: Claude Code.

Or install marketing, the plugin that ships this one along with the rest of its 29 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 copy-editing

README.md
[![agentmods](https://agentmods.dev/badge/skills/bromso/metapowers/copy-editing/github.svg)](https://agentmods.dev/skills/bromso/metapowers/copy-editing)
Your own site
<a href="https://agentmods.dev/skills/bromso/metapowers/copy-editing"><img src="https://agentmods.dev/badge/skills/bromso/metapowers/copy-editing/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 copy-editing

Your own site · 80×15
<a href="https://agentmods.dev/skills/bromso/metapowers/copy-editing"><img src="https://agentmods.dev/badge/skills/bromso/metapowers/copy-editing.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 70 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 592 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 $0.00070 $0.00592
Opus 5.5 $0.00028 $0.00237
Sonnet 5.5 $0.00014 $0.00118
Haiku 4.5 $0.00007 $0.00059

Measured 3d ago against content hash c2127c86f56a, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

copy-editing 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 3d 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.

plugins/marketing/skills/copy-editing/SKILL.md · 56 lines

How it starts

The opening of the file, as written. The whole thing — 56 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Copy Editing

Edit and refine marketing copy for "$ARGUMENTS". Improve clarity, persuasiveness, and brand consistency of existing content.

Arguments. $ARGUMENTS may contain the project name and optional flags. Take the first token as <project> and treat --skip-checks as a flag; never include flags in file paths. All paths below use <project>. If --skip-checks is present, skip the prerequisite check and, before writing any artifact, append one line to .metapowers/marketing/<project>/skip-log.md: - <ISO timestamp> — <skill name> skipped prerequisite check for <artifact file> — reason: <reason or "none given">.

Prerequisites

None — this is a utility skill. Provide the copy to edit as "" or as content in the conversation.

Process

  1. Read the copy:

    • If a file path is provided, read the file
    • If a URL is provided, use WebFetch to read the page content
    • If copy is provided inline, work with that directly
  2. Read context (if available):

    • Read .metapowers/marketing/<project>/00-strategy.md for brand voice and messaging guidelines
    • Check for tone, audience, and positioning context
  3. Edit for clarity:

    • Remove jargon and unnecessary complexity
    • Shorten sentences (aim for 15-20 words average)
    • Use active voice
    • Eliminate weasel words and filler
    • Ensure logical flow between paragraphs
  4. Edit for persuasion:

    • Is the value proposition clear in the first sentence?
    • Are benefits emphasized over features?
    • Is social proof present and specific?
    • Is the CTA clear and compelling?
    • Does the copy address the reader's objections?
  5. Edit for consistency:

    • Consistent terminology throughout
    • Brand voice alignment
    • Formatting and style consistency
    • Grammar and punctuation
  6. Present the edit:

    • Show the edited copy with changes highlighted
    • Explain the rationale for major changes
    • Flag any areas where the editor needs more context

Read the full file on GitHub · 56 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. 3d ago First seen · 56 lines · 70 tokens per session scan A c2127c86f56a

Subscribe to this mod's changes

copy-editing is a skill published in the GitHub repository bromso/metapowers (2 stars, last pushed 3d ago), licensed MIT. It adds 70 tokens to every session and 592 once invoked, about $0.0003 per session on Opus 5.5. 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 2026-10-21.