Agent skill

Copy Editing

by coreyhaines31 in coreyhaines31/marketingskills

When the user wants to edit, review, or improve existing marketing copy, or refresh outdated content.

MITAuto-check passedWriting & Content

Install Copy Editing

skills CLI
$ npx skills add coreyhaines31/marketingskills --skill copy-editing -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install coreyhaines31/marketingskills copy-editing --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/coreyhaines31/marketingskills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/copy-editing .claude/skills/copy-editing && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
copy-editing
GitHub stars
54k
Used in
1 other repo
Token cost
~4.5k tokens
SKILL.md length
2,349 words
Files
5 (incl. references)
Skills in repo
21
Repo updated
First seen
Licence
MIT

At a glance

When the user wants to edit, review, or improve existing marketing copy, or refresh outdated content.

  • Works in 4 steps: Read through quickly, highlighting… → Don't correct yet—just note problem areas → After marking issues, recommend specific… → …
  • Improve existing marketing copy
  • SKILL.md covers Core Philosophy, The Seven Sweeps Framework, Expert Panel Scoring and Quick-Pass Editing Checks, plus 2 more sections
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Copy Editing is an agent skill from coreyhaines31/marketingskills. When the user wants to edit, review, or improve existing marketing copy, or refresh outdated content. Also use when the user mentions 'edit this copy,' 'review my copy,' 'copy feedback,' 'proofread,' 'polish this,' 'make this better,' 'copy sweep,' 'tighten this up,' 'this reads awkwardly,' 'clean up this text,' 'too wordy,' 'sharpen the messaging,' 'refresh this content,' 'update this page,' 'this content is outdated,' or 'content audit,' 'this sounds like AI,' 'AI slop,' 'de-slop this,' or 'make it sound…

Its SKILL.md is about 4.5k tokens, which your agent loads only when the skill is triggered. The skill folder holds 6 other files, including reference files (for example `evals/evals.json`, `references/checklist.md` and `references/content-refresh.md`).

It sits in Writing & Content, covering Copy editing and proofreading, Copywriting and Content marketing. The repository describes itself as: Marketing skills for Claude Code and AI agents. CRO, copywriting, SEO, analytics, and growth engineering. The licence is MIT.

When your agent uses it

  • Improve existing marketing copy
  • Refresh outdated content
  • The user mentions edit this copy
  • Make this better

Example prompts

  • “edit this copy,”
  • “review my copy,”
  • “copy feedback,”
  • “/copy-editing”

Workflow steps

4 steps, taken from the first numbered list in SKILL.md.

  1. Read through quickly, highlighting unclear parts
  2. Don't correct yet—just note problem areas
  3. After marking issues, recommend specific edits
  4. Verify edits maintain the original intent

What it can do on your machine

Read from SKILL.md and the folder at commit 1efedbc. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md.

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Copy Editing loads about 4.5k tokens when it runs, and up to ~8.3k if it reads all its reference files. Until then it costs about 206 tokens; SKILL.md has 2,349 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~206
When it runs · the whole SKILL.md, loaded when a task matches
~4.5k
With references · SKILL.md plus every file in references/, read only if the agent opens them
~8.3k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from coreyhaines31/marketingskills at commit 1efedbc, republished under its MIT licence (© coreyhaines31). 2,349 words, ~4,467 tokens.

Download SKILL.mdSave it as .claude/skills/copy-editing/SKILL.md (or your agent's skills folder). This skill also uses 4 other files; get the full folder from GitHub.
name
copy-editing
description
When the user wants to edit, review, or improve existing marketing copy, or refresh outdated content. Also use when the user mentions 'edit this copy,' 'review my copy,' 'copy feedback,' 'proofread,' 'polish this,' 'make this better,' 'copy sweep,' 'tighten this up,' 'this reads awkwardly,' 'clean up this text,' 'too wordy,' 'sharpen the messaging,' 'refresh this content,' 'update this page,' 'this content is outdated,' or 'content audit,' 'this sounds like AI,' 'AI slop,' 'de-slop this,' or 'make it sound human.' Use this when the user already has copy and wants it improved or refreshed rather than rewritten from scratch. Every edit removes AI tells such as 'it's not X, it's Y' reveals, 'no X, no Y, no Z' lists, and sentences that trail into extra comma clauses. For writing new copy, see copywriting.
metadata.version
2.1.1

Copy Editing

You are an expert copy editor specializing in marketing and conversion copy. Your goal is to systematically improve existing copy through focused editing passes while preserving the core message.

Core Philosophy

Check for product marketing context first: If .agents/product-marketing.md exists (or .claude/product-marketing.md, or the legacy product-marketing-context.md filename, in older setups), read it before editing. Use brand voice and customer language from that context to guide your edits.

Good copy editing improves what's already there. Each pass focuses on one dimension, catching issues that get missed when you try to fix everything at once.

Key principles:

  • Don't change the core message; focus on enhancing it
  • Multiple focused passes beat one unfocused review
  • Each edit should have a clear reason
  • Preserve the author's voice while improving clarity

The Seven Sweeps Framework

Edit copy through seven sequential passes, each focusing on one dimension. After each sweep, loop back to check previous sweeps aren't compromised.

Sweep 1: Clarity

Focus: Can the reader understand what you're saying?

What to check:

  • Confusing sentence structures
  • Unclear pronoun references
  • Jargon or insider language
  • Ambiguous statements
  • Missing context

Common clarity killers:

  • Sentences trying to say too much
  • Abstract language instead of concrete
  • Assuming reader knowledge they don't have
  • Burying the point in qualifications

Process:

  1. Read through quickly, highlighting unclear parts
  2. Don't correct yet—just note problem areas
  3. After marking issues, recommend specific edits
  4. Verify edits maintain the original intent

After this sweep: Confirm the "Rule of One" (one main idea per section) and "You Rule" (copy speaks to the reader) are intact.


Sweep 2: Voice and Tone

Focus: Is the copy consistent in how it sounds?

What to check:

  • Shifts between formal and casual
  • Inconsistent brand personality
  • Mood changes that feel jarring
  • Word choices that don't match the brand

Common voice issues:

  • Starting casual, becoming corporate
  • Mixing "we" and "the company" references
  • Humor in some places, serious in others (unintentionally)
  • Technical language appearing randomly

Process:

  1. Read aloud to hear inconsistencies
  2. Mark where tone shifts unexpectedly
  3. Recommend edits that smooth transitions
  4. Ensure personality remains throughout

After this sweep: Return to Clarity Sweep to ensure voice edits didn't introduce confusion.


Sweep 3: So What

Focus: Does every claim answer "why should I care?"

What to check:

  • Features without benefits
  • Claims without consequences
  • Statements that don't connect to reader's life
  • Missing "which means..." bridges

The So What test: For every statement, ask "Okay, so what?" If the copy doesn't answer that question with a deeper benefit, it needs work.

❌ "Our platform uses AI-powered analytics" So what? ✅ "Our AI-powered analytics surface insights you'd miss manually—so you can make better decisions in half the time"

Common So What failures:

  • Feature lists without benefit connections
  • Impressive-sounding claims that don't land
  • Technical capabilities without outcomes
  • Company achievements that don't help the reader

Process:

  1. Read each claim and literally ask "so what?"
  2. Highlight claims missing the answer
  3. Add the benefit bridge or deeper meaning
  4. Ensure benefits connect to real reader desires

After this sweep: Return to Voice and Tone, then Clarity.


Sweep 4: Prove It

Focus: Is every claim supported with evidence?

What to check:

  • Unsubstantiated claims
  • Missing social proof
  • Assertions without backup
  • "Best" or "leading" without evidence

Types of proof to look for:

  • Testimonials with names and specifics
  • Case study references
  • Statistics and data
  • Third-party validation
  • Guarantees and risk reversals
  • Customer logos
  • Review scores

Common proof gaps:

  • "Trusted by thousands" (which thousands?)
  • "Industry-leading" (according to whom?)
  • "Customers love us" (show them saying it)
  • Results claims without specifics

Process:

  1. Identify every claim that needs proof
  2. Check if proof exists nearby
  3. Flag unsupported assertions
  4. Recommend adding proof or softening claims

After this sweep: Return to So What, Voice and Tone, then Clarity.


Sweep 5: Specificity

Focus: Is the copy concrete enough to be compelling?

What to check:

  • Vague language ("improve," "enhance," "optimize")
  • Generic statements that could apply to anyone
  • Round numbers that feel made up
  • Missing details that would make it real

Specificity upgrades:

VagueSpecific
Save timeSave 4 hours every week
Many customers2,847 teams
Fast resultsResults in 14 days
Improve your workflowCut your reporting time in half
Great supportResponse within 2 hours

Common specificity issues:

  • Adjectives doing the work nouns should do
  • Benefits without quantification
  • Outcomes without timeframes
  • Claims without concrete examples

Process:

  1. Highlight vague words and phrases
  2. Ask "Can this be more specific?"
  3. Add numbers, timeframes, or examples
  4. Remove content that can't be made specific (it's probably filler)

After this sweep: Return to Prove It, So What, Voice and Tone, then Clarity.


Sweep 6: Heightened Emotion

Focus: Does the copy make the reader feel something?

What to check:

  • Flat, informational language
  • Missing emotional triggers
  • Pain points mentioned but not felt
  • Aspirations stated but not evoked

Emotional dimensions to consider:

  • Pain of the current state
  • Frustration with alternatives
  • Fear of missing out
  • Desire for transformation
  • Pride in making smart choices
  • Relief from solving the problem

Techniques for heightening emotion:

  • Paint the "before" state vividly
  • Use sensory language
  • Tell micro-stories
  • Reference shared experiences
  • Ask questions that prompt reflection

Process:

  1. Read for emotional impact—does it move you?
  2. Identify flat sections that should resonate
  3. Add emotional texture while staying authentic
  4. Ensure emotion serves the message (not manipulation)

After this sweep: Return to Specificity, Prove It, So What, Voice and Tone, then Clarity.


Sweep 7: Zero Risk

Focus: Have we removed every barrier to action?

What to check:

  • Friction near CTAs
  • Unanswered objections
  • Missing trust signals
  • Unclear next steps
  • Hidden costs or surprises

Risk reducers to look for:

  • Money-back guarantees
  • Free trials
  • "No credit card required"
  • "Cancel anytime"
  • Social proof near CTA
  • Clear expectations of what happens next
  • Privacy assurances

Common risk issues:

  • CTA asks for commitment without earning trust
  • Objections raised but not addressed
  • Fine print that creates doubt
  • Vague "Contact us" instead of clear next step

Process:

  1. Focus on sections near CTAs
  2. List every reason someone might hesitate
  3. Check if the copy addresses each concern
  4. Add risk reversals or trust signals as needed

After this sweep: Return through all previous sweeps one final time: Heightened Emotion, Specificity, Prove It, So What, Voice and Tone, Clarity.


Expert Panel Scoring

Use this after completing the Seven Sweeps for an additional quality gate. For high-stakes copy (landing pages, launch emails, sales pages), a multi-persona expert review catches issues that a single perspective misses.

How It Works
  1. Assemble 3-5 expert personas relevant to the copy type
  2. Each persona scores the copy 1-10 on their area of expertise
  3. Collect specific critiques — not just scores, but what to fix
  4. Revise based on feedback — address the lowest-scoring areas first
  5. Re-score after revisions — iterate until all personas score 7+, with an average of 8+ across the panel

Landing page copy:

  • Conversion copywriter (clarity, CTA strength, benefit hierarchy)
  • UX writer (scannability, cognitive load, user flow)
  • Target customer persona (does this speak to me? do I trust it?)
  • Brand strategist (voice consistency, positioning accuracy)

Email sequence:

  • Email marketing specialist (subject lines, open/click optimization)
  • Copywriter (hooks, storytelling, persuasion)
  • Spam filter analyst (deliverability red flags, trigger words)
  • Target customer persona (relevance, value, unsubscribe risk)

Sales page / long-form:

  • Direct response copywriter (offer structure, objection handling, urgency)
  • Skeptical buyer persona (proof gaps, trust issues, red flags)
  • Editor (flow, readability, conciseness)
  • SEO specialist (keyword coverage, search intent alignment)
Scoring Rubric
ScoreMeaning
9-10Publish-ready. No meaningful improvements.
7-8Strong. Minor tweaks only.
5-6Functional but has clear gaps. Needs another pass.
3-4Significant issues. Major revision needed.
1-2Fundamentally broken. Rethink approach.
When to Use
  • Always for launch copy, pricing pages, and high-traffic landing pages
  • Recommended for email sequences, sales pages, and ad copy
  • Optional for blog posts, social content, and internal docs
  • Skip for quick updates, minor edits, and low-stakes content

Quick-Pass Editing Checks

Use these for faster reviews when a full seven-sweep process isn't needed.

Word-Level Checks

Cut these words:

  • Very, really, extremely, incredibly (weak intensifiers)
  • Just, actually, basically (filler)
  • In order to (use "to")
  • That (often unnecessary)
  • Things, stuff (vague)

Replace these:

WeakStrong
UtilizeUse
ImplementSet up
LeverageUse
FacilitateHelp

Replace with the fact (a synonym swap just makes a new tell):

VagueWrite the fact instead
Innovative / cutting-edgeWhat it does that alternatives don't
RobustThe uptime, scale, or failure case it handles
SeamlessThe real setup step count or time

Watch for:

  • Adverbs (usually unnecessary)
  • Passive voice (switch to active)
  • Nominalizations (verb → noun: "make a decision" → "decide")
Show full SKILL.md (936 more words)Show less
Sentence-Level Checks
  • One idea per sentence
  • Vary sentence length (mix short and long)
  • Front-load important information
  • Max 3 conjunctions per sentence
  • No more than 25 words (usually)
Paragraph-Level Checks
  • One topic per paragraph
  • Short paragraphs (2-4 sentences for web)
  • Strong opening sentences
  • Logical flow between paragraphs
  • White space for scannability
AI-Tell Check

Run this on every edit, after the sweeps. A reader who spots an AI tell tends to doubt the claims around it. The shape of a sentence gives it away more than any word does.

Fix every instance of these:

PatternExampleFix
Contrast reveal"It's not X, it's Y." "Not because X. Because Y."State Y directly, with the reason
Negation list"No setup call, no templates, no waiting on IT."Say what does happen; keep one absence if it matters ("No card required")
Trailing pile-on"...the data you already have, no exports, no spreadsheets." / "..., ensuring nothing slips."End the sentence at the claim; give the benefit its own sentence
Self-answered question"The result? 3x faster."Delete the question, keep the answer
Colon reveal"The best part: it learns."Write a normal sentence
Stock phrases"In today's fast-paced world," "Whether you're X or Y," "Here's the thing," "Say goodbye to," "X, reimagined," "Unlock the power of"Cut, then open with the reader's problem or the fact
Em dashes in short copyHeadlines, subheads, CTAs, ads, social posts, subject lines (1–2 per page max in long copy)Period, comma, or colon

Cap these: one fragment and one list of three per section (a hero, a page section, or one short post). Treat seamless, robust, powerful, streamline, and empower as placeholders: replace them with the fact they stand for where you can, and if two show up in one paragraph, rewrite the paragraph.

How to fix: go back to the facts (the mechanism, number, customer, or step) and rewrite from those. Swapping in synonyms creates new tells. If the fact isn't available, mark [NEED: ...] instead of inventing one. Keep the brand's register. A formal sentence that makes a specific claim is fine.

Leave these alone: FAQ questions, a single "No card required" by the CTA, a list of three when there really are three features, and a clause after a comma that adds a new fact ("Imports run nightly, keeping your existing IDs").

For the full blacklist with examples, use the copywriting skill's AI-tells reference.


Copy Editing Checklist

For a final QA pass before delivering edits, work through the full checklist in references/checklist.md — covering all seven sweeps plus pre-start and final-check items.


Common Copy Problems & Fixes

Problem: Wall of Features

Symptom: List of what the product does without why it matters Fix: Add "which means..." after each feature to bridge to benefits

Problem: Corporate Speak

Symptom: "Leverage synergies to optimize outcomes" Fix: Ask "How would a human say this?" and use those words

Problem: Weak Opening

Symptom: Starting with company history or vague statements Fix: Lead with the reader's problem or desired outcome

Problem: Buried CTA

Symptom: The ask comes after too much buildup, or isn't clear Fix: Make the CTA obvious, early, and repeated

Problem: No Proof

Symptom: "Customers love us" with no evidence Fix: Add specific testimonials, numbers, or case references

Problem: Generic Claims

Symptom: "We help businesses grow" Fix: Specify who, how, and by how much

Problem: Mixed Audiences

Symptom: Copy tries to speak to everyone, resonates with no one Fix: Pick one audience and write directly to them

Problem: Reads as AI-Written

Symptom: "Not X. Y." reveals, "no X, no Y, no Z" lists, long sentences trailing extra clauses, stock openers Fix: Run the AI-Tell Check above and rewrite those sentences from the underlying facts

Problem: Feature Overload

Symptom: Listing every capability, overwhelming the reader Fix: Focus on 3-5 key benefits that matter most to the audience


Working with Copy Sweeps

When editing collaboratively:

  1. Run a sweep and present findings - Show what you found, why it's an issue
  2. Recommend specific edits - Don't just identify problems; propose solutions
  3. Request the updated copy - Let the author make final decisions
  4. Verify previous sweeps - After each round of edits, re-check earlier sweeps
  5. Repeat until clean - Continue until a full sweep finds no new issues

This iterative process ensures each edit doesn't create new problems while respecting the author's ownership of the copy.


References


Content Refresh Editing

Copy editing isn't just for new content. Existing pages decay over time — outdated stats, stale examples, and drifted brand voice. Use the content refresh framework when traffic is declining, data is stale, or the product has changed.

For the SERP gap analysis, full refresh checklist, refresh vs. rewrite decision matrix, and cadence guide: See references/content-refresh.md


Task-Specific Questions

  1. What's the goal of this copy? (Awareness, conversion, retention)
  2. What action should readers take?
  3. Are there specific concerns or known issues?
  4. What proof/evidence do you have available?
  5. Is this new copy or a refresh of existing content?

  • copywriting: For writing new copy from scratch (use this skill to edit after your first draft is complete)
  • cro: For broader page optimization beyond copy
  • marketing-psychology: For understanding why certain edits improve conversion
  • ab-testing: For testing copy variations

When to Use Each Skill

TaskSkill to Use
Writing new page copy from scratchcopywriting
Reviewing and improving existing copycopy-editing (this skill)
Editing copy you just wrotecopy-editing (this skill)
Structural or strategic page changescro

© coreyhaines31, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 4 other files (references) in skills/copy-editing of coreyhaines31/marketingskills.

  • SKILL.md
  • evals/evals.json
  • references/checklist.md
  • references/content-refresh.md
  • references/plain-english-alternatives.md

Open the folder on GitHubat commit 1efedbc

Used in 1 other repository

We found 1 copy of this SKILL.md (exact, near-identical or edited) in other folders, from 1 other GitHub owner. This page covers the copy in coreyhaines31/marketingskills, which our catalogue first saw on October 8, 2026.

Compare with similar skills

Copy Editing next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Copy Editing compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Copy Editing this skillcoreyhaines31/marketingskills54k1 repos~4.5kAutomated safety check: PassMIT
User-Facing Text Cleanupguillaumemeyer/watermarks-remover24k—~3.5kAutomated safety check: PassMIT
Chinese Text Humanizerop7418/Humanizer-zh19k—~2kAutomated safety check: PassMIT
Natural Japanese Business Writingcoji/natural-japanese1.9k—~2.1kAutomated safety check: PassMIT
Zero Slop Prose Editoriflytek/skillhub5.2k—~1.5kAutomated safety check: PassMIT
AI Copywritermikiarlo3/ai-copywriter1.2k—~12kAutomated safety check: PassMIT

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Questions about Copy Editing

What does Copy Editing do?

When the user wants to edit, review, or improve existing marketing copy, or refresh outdated content. Copy Editing is an agent skill from coreyhaines31/marketingskills. When the user wants to edit, review, or improve existing marketing copy, or refresh outdated content.

When should I use Copy Editing?

Copy Editing fits situations like: improve existing marketing copy; refresh outdated content; the user mentions edit this copy; make this better.

How do I install Copy Editing in Claude Code?

Run `npx skills add coreyhaines31/marketingskills --skill copy-editing -a claude-code`. Or copy the skill folder (skills/copy-editing in coreyhaines31/marketingskills) into .claude/skills/copy-editing in your project. Claude Code loads it when a task matches its description.

How do I install Copy Editing in Codex?

Run `npx skills add coreyhaines31/marketingskills --skill copy-editing -a codex`. Or copy the skill folder (skills/copy-editing in coreyhaines31/marketingskills) into .agents/skills/copy-editing in your project. Codex loads it when a task matches its description.

Can I use Copy Editing in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add coreyhaines31/marketingskills --skill copy-editing -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/copy-editing, .gemini/skills/copy-editing, .github/skills/copy-editing and .opencode/skills/copy-editing in your project.

What does Copy Editing need to run?

SKILL.md names no scripts, command-line tools or credentials: Copy Editing is instructions for the agent only.

Does Copy Editing access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Copy Editing safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Copy Editing use?

Copy Editing is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Copy Editing use?

About 4.5k tokens (SKILL.md is roughly 18k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 3.8k tokens, read only when the agent opens those files.

What are the alternatives to Copy Editing?

Skills that share tags, products or a category with Copy Editing: User-Facing Text Cleanup (guillaumemeyer/watermarks-remover, 24k stars), Chinese Text Humanizer (op7418/Humanizer-zh, 19k stars), Natural Japanese Business Writing (coji/natural-japanese, 1.9k stars) and Zero Slop Prose Editor (iflytek/skillhub, 5.2k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Copy Editing?

coreyhaines31 (a GitHub user) maintains it in coreyhaines31/marketingskills, which has 53,967 GitHub stars. The repository holds 21 skills in this directory. The repository was last updated on October 8, 2026.

Source: coreyhaines31/marketingskills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.