Claude Skills are folders that include instructions, scripts, and resources Claude loads when relevant. Each Skill is a directory with a SKILL.md file that tells Claude what the Skill does and when to use it.
Anthropic describes Skills as composable, portable, efficient, and powerful. They work across Claude apps, Claude Code, and the Claude Developer Platform API using the same format. They load only when needed, so a long reference document costs almost nothing in context until the moment Claude actually needs it.
For marketers, that single property changes the workflow. Instead of pasting the same brand voice rules, ICP description, or auditing checklist into every chat, you write it once in a SKILL.md file and Claude pulls it in automatically when relevant. The recipe lives in your folder, not your tab history.
How Claude Skills Actually Work
A Skill is a directory. The minimum is a single SKILL.md file with YAML frontmatter and markdown instructions. The frontmatter tells Claude when to invoke the Skill. The markdown is the playbook Claude follows once invoked. You can add reference files, example outputs, and executable scripts in the same folder.
Folder structure
brand-voice-auditor/
├── SKILL.md # Main playbook (required)
├── references/
│ ├── brand-voice-guide.md # Tone of voice rules
│ └── sample-posts.md # Examples of on-brand copy
└── scripts/
└── flag-banned-words.sh # Optional helperThe SKILL.md frontmatter declares the Skill name and description. Claude reads the description to decide when to load the full body. Anthropic recommends keeping the main file under 500 lines and moving long reference material into separate files in the same folder.
SKILL.md example
--- name: brand-voice-auditor description: Audits a draft against our brand voice rules. Use when a teammate or AI tool produces copy and we need to verify it matches our voice before publishing. --- When auditing a draft: 1. Compare against the rules in references/brand-voice-guide.md 2. Flag every line that breaks a rule 3. Rewrite the flagged line in our voice 4. Explain the change in one sentence
Where Claude Skills Run
Skills follow the open Agent Skills standard. The same Skill folder works across three Claude surfaces, which is why marketers can build a recipe once and run it on whichever platform the rest of their workflow lives on.
Claude Apps
Pro, Max, Team, and Enterprise plans. As a user: Customize > Skills > + to upload a ZIP of your skill folder. Org owners enable Settings > Capabilities first, then upload through Settings > Skills. Best for non-technical marketers who want a clean UI.
Claude Code
Personal Skills go in ~/.claude/skills/<name>/. Project Skills go in .claude/skills/<name>/ and can be checked into git. Claude Code watches both folders live.
Developer API
The Claude Developer Platform exposes a /v1/skills endpoint plus a Code Execution Tool beta. Use this to embed Skills into your own product.
The 12 Best Claude Skills for Marketers
Each recipe below has a clear "when to use", a folder layout, and a copy-paste prompt that triggers it. Build them yourself in 10-15 minutes per Skill, or run the same recipes through a no-code platform if file management is not how you want to spend your week.
Brand Voice Auditor
Reads a draft and flags every line that breaks your tone-of-voice rules. Returns rewritten suggestions in your voice.
When to use
Before publishing any post, email, or landing copy that was written by another team member or AI tool.
Files
SKILL.md plus references/brand-voice-guide.md and references/sample-posts.md
Copy-paste prompt
Audit this draft against my brand voice guide. Flag every line that breaks the rules in references/brand-voice-guide.md. For each flag, rewrite the line in our voice and explain the change in one sentence.
Competitor Teardown
Analyzes a competitor landing page or post and returns a structured teardown: hooks, offers, social proof, gaps you can attack.
When to use
When entering a new niche, launching a comparison page, or planning a counter-positioning campaign.
Files
SKILL.md with allowed-tools for WebFetch and a reference of your positioning pillars.
Copy-paste prompt
Tear down this competitor page: <URL>. Return: top 3 hooks, primary offer, headline structure, social proof types, CTA pattern, and 5 gaps where our positioning beats theirs.
Landing Page Auditor
Audits a landing page for conversion killers. Returns a numbered list with severity, fix, and expected impact.
When to use
After a launch where the conversion rate disappointed, or before a paid traffic push.
Files
SKILL.md plus references/conversion-checklist.md (CRO heuristics from your past wins).
Copy-paste prompt
Audit this landing page: <URL>. For each issue found, return: severity (critical / high / medium / low), the line in the copy, the fix, and expected impact on conversion.
Email Sequence Writer
Writes a full lifecycle email sequence (welcome, nurture, sales, win-back) with subject lines and send-time recommendations.
When to use
Launching a course, free trial, or e-commerce flow. Replaces the worst kind of "blank page" work.
Files
SKILL.md plus references/icp.md (your customer profile) and references/voice.md.
Copy-paste prompt
Write a 7-email welcome sequence for someone who just signed up for our free trial. Use the ICP in references/icp.md and the voice in references/voice.md. Return subject lines, body, and recommended send delay.
Content Repurposer
Turns one long-form asset (blog, podcast, livestream transcript) into 8+ platform-native posts: LinkedIn, X thread, Instagram carousel, Threads, YouTube short script.
When to use
After every podcast, livestream, blog publish, or webinar. Stops the "I posted once and now nothing" loop.
Files
SKILL.md plus references/platform-formats.md with character limits, hook patterns, hashtag rules.
Copy-paste prompt
Take the transcript at <path> and produce: 1 LinkedIn post, 1 X thread (5 tweets), 1 Instagram carousel (5 slides), 2 Threads posts, 1 YouTube Short script. Match each platform's format rules in references/platform-formats.md.
UTM & Tracking Generator
Generates consistent UTM parameters and tracking links from a structured brief. No more naming chaos in GA4.
When to use
Every campaign launch. The first place attribution silently breaks is sloppy UTM naming.
Files
SKILL.md plus references/utm-naming-convention.md (your team's exact rules).
Copy-paste prompt
Generate UTM links for this campaign: source=newsletter, medium=email, campaign=q2-launch, with content variants for each of these subject lines: <list>. Follow the rules in references/utm-naming-convention.md.
Google Ads Audit
Reads a Google Ads export (CSV or screenshot) and finds wasted spend: low-CTR keywords, broken landing pages, audience overlap, dayparting gaps.
When to use
Monthly review, mid-quarter pivot, or any moment CPA jumps and you can't see why.
Files
SKILL.md plus references/account-targets.md (your CPA, CPL, and ROAS thresholds).
Copy-paste prompt
Audit this Google Ads export: <path>. Compare against the targets in references/account-targets.md. Return a prioritized list of waste, the keyword or campaign, and the recommended fix.
Meta Ads Audit
Spots creative fatigue, audience overlap, and underperforming ad sets in a Meta Ads export. Returns a refresh checklist.
When to use
Every 2-3 weeks during an active media push. Creative fatigue is the silent killer of paid social.
Files
SKILL.md plus references/creative-rotation-rules.md.
Copy-paste prompt
Audit this Meta Ads export: <path>. Identify ads with frequency above 3, CTR below account average, and any audience overlap above 20%. Return a creative refresh plan grouped by ad set.
A/B Test Analyzer
Takes raw test data (impressions, conversions, variants) and returns statistical significance, confidence interval, and a clear "ship / keep testing / kill" recommendation.
When to use
After every landing page, ad, or email subject line test. Stops the "is this real?" loop.
Files
SKILL.md with a stats helper script (Python) for significance math.
Copy-paste prompt
Analyze this A/B test: <data>. Return: lift, p-value, 95% confidence interval, statistical significance verdict, and one of: ship the winner / keep testing / kill the test.
Programmatic SEO Builder
Generates a clustered set of programmatic SEO pages from a seed keyword and a data set, without sounding spammy.
When to use
Launching a comparison hub, "best X for Y" cluster, or location-based directory pages.
Files
SKILL.md plus references/seo-quality-bar.md (heading rules, internal-link mesh, FAQ structure).
Copy-paste prompt
Generate 10 programmatic SEO page briefs for the cluster "<seed>". For each, return: target keyword, search intent, H2/H3 outline, internal links, FAQ schema, and meta description. Follow the quality bar in references/seo-quality-bar.md.
Brand-On Document Generator
Creates Excel spreadsheets, PowerPoint decks, Word docs, and fillable PDFs that follow your brand guidelines automatically. Anthropic ships this category as a built-in skill family.
When to use
Every internal doc, sales deck, or client-facing report. The hours-long "make it on-brand" pass disappears.
Files
Anthropic's built-in document Skills (Pro, Max, Team, Enterprise plans) plus a SKILL.md that adds your brand-specific rules.
Copy-paste prompt
Build a 10-slide pitch deck for our Q3 product launch. Use the brand colors, fonts, and slide templates in references/brand-system.md. Include: problem, solution, market, traction, ask.
Pitch Deck Builder
Builds a full pitch deck from one structured prompt: cover, problem, solution, market, demo, traction, team, ask. Pairs with the brand-on document Skill above.
When to use
Investor meetings, partnership pitches, agency new-business decks. Cuts a one-day task to under an hour.
Files
SKILL.md plus references/deck-template.md and references/our-pitch-pillars.md.
Copy-paste prompt
Build an investor pitch deck for our Series Seed round. Pull the latest metrics from references/metrics.md. Use the structure in references/deck-template.md and the positioning in references/our-pitch-pillars.md.
Build Your Own vs Use a Pre-Built Platform
Two paths exist for marketers in 2026, and they cater to very different people.
The build path means writing your own SKILL.md files and managing them in folders. You get maximum control. Your brand voice rules, your auditing checklists, your team conventions - all encoded in markdown you can version in git. This works well for technical marketers, ops teams, and anyone who already uses Claude Code. Setup time is 10-15 minutes per Skill.
The platform path means using a tool that runs the same recipes through a UI without the file management. Brand Brain does the brand voice training, content generation, scheduling, and publishing inside one app. The Skill recipes above are the same patterns Brand Brain runs internally - it just hides the folders. Useful when you want the workflow without the SKILL.md file management.
Both paths are valid. Many marketers use both: Claude Skills for one-off audits and research, a platform like Brand Brain for the always-on content engine.
Quick-Start: Ship Your First Skill in 15 Minutes
Pick one repetitive task
Auditing landing pages, repurposing podcasts, writing email subject lines - whatever you re-explain to Claude every week. That is the Skill candidate.
Create the folder
In Claude Code, run mkdir -p ~/.claude/skills/<name>. In Claude apps, prepare a folder you can zip and upload through Customize > Skills.
Write SKILL.md
Frontmatter with name and description, then the playbook in markdown. Use one of the 12 recipes above as a template.
Add reference files
Brand voice guide, ICP doc, conversion checklist. Anything you would otherwise paste into chat. Reference these files from SKILL.md.
Test and refine
Invoke the Skill on a real task. If the output misses, edit SKILL.md - Claude Code picks up changes live within the session.
Common Pitfalls to Avoid
Writing one giant SKILL.md. Anthropic recommends keeping SKILL.md under 500 lines. Move long reference material to separate files in the same folder and link to them. Big files cost context and slow Claude's decision to load them.
Vague descriptions. The frontmatter description is what Claude reads to decide whether to invoke the Skill. "Marketing helper" triggers nothing. "Audits a draft against our brand voice rules. Use when a teammate or AI tool produces copy and we need to verify it matches our voice before publishing" triggers exactly when you want it to.
Forgetting disable-model-invocation: true on side-effect Skills. If a Skill posts to LinkedIn, sends an email, or pushes a deploy, you don't want Claude triggering it on its own judgement. Add the flag and only you can run it.
Not version-controlling team Skills. Project Skills in .claude/skills/ get committed to git like any other code. Skip this and your team ends up with seven different versions of the same audit checklist.