Marketing is the category where one skill family nearly swept the leaderboard — a coherent growth stack covering the entire funnel. Here's the full list, with what each tool actually does and when to reach for it.
The marketing category has an unusual shape: instead of scattered individual skills, it's dominated by a family of purpose-built tools that cover the whole funnel — audience research at the top, SEO and ads in the middle, email and landing pages at the bottom.
What makes the family work isn't any single tool. It's that each skill has a narrow trigger and a defined job — they fire when you're doing that specific marketing task, and stay out of the way the rest of the time.
1. serp-markup-builder — 9.4/10
Meta tags, title tags, and structured data (schema markup) for search.
Why: The highest score in the category. It generates valid, current schema markup — the structured data that earns rich snippets — and validates output before handing it over. Bad schema is worse than no schema; this skill takes that seriously.
The one thing: Rich results eligibility changes with Google's whims. What validates today may not render as a rich result tomorrow.
2. technical-seo-checker — 9.3/10
Technical SEO audits: crawlability, indexability, Core Web Vitals, sitemap health.
Why: The audit sequence mirrors what an agency would run — crawl first, index second, performance third — instead of dumping every tool output into one overwhelming report.
The one thing: It needs access to your actual site. Point it at a staging clone first if you're nervous.
3. message-test-designer — 9.2/10
Test messaging before you scale it — structured experiments on positioning claims.
Why: The most underrated skill in the category. Most teams pick messaging by opinion; this designs an actual test with a decision rule. It's marketing acting like engineering.
The one thing: It designs the test; you still need the audience and budget to run it.
4. on-page-seo-checker — 9.2/10
Diagnose why a single page underperforms — content depth, intent match, internal linking.
Why: Page-level diagnosis is where technical audits end and this begins. "Why is THIS page not ranking" gets a structured answer, not a shrug.
The one thing: It diagnoses the page, not the query. If you're targeting the wrong keyword, no on-page fix saves you.
5. ad-test-designer — 9.1/10
A/B test design for ads, creatives, and landing pages.
Why: Sample-size math, significance thresholds, and stopping rules built in — the three things ad platforms quietly encourage you to ignore.
The one thing: It will tell you your test needs more impressions than your budget allows. That's the correct answer, even when it's unwelcome.
6. email-creative-builder — 9.0/10
Email copy, subject lines, and campaign structure.
Why: Writes to segments, not to "everyone." The output varies appropriately between a cold B2B email and a retention offer.
The one thing: Pair it with deliverability-qa (below) before sending. Great copy into a spam filter reaches no one.
7. email-render-builder — 9.0/10
Responsive, client-compatible email HTML.
Why: Email HTML is a hostile environment — Outlook renders like it's 2003. This skill knows the compatibility traps and routes around them, testing rendering rather than assuming it.
The one thing: Always send yourself a test across clients anyway. The email client landscape is too chaotic for full confidence.
8. deliverability-qa — 9.0/10
Pre-flight checks before you hit send: SPF, DKIM, DMARC, list hygiene, spam triggers.
Why: The unglamorous skill that protects everything else. Deliverability problems are silent — your emails "send" and vanish. This checks the pipes before the water flows.
The one thing: It checks your sending setup, not your sender reputation. Reputation damage is cumulative and this can't undo it.
9. landing-optimizer — 9.0/10
Landing page optimization for specific traffic sources — including influencer and campaign traffic.
Why: It optimizes for the traffic source, not generically. An influencer-driven visitor needs different things than a search visitor, and this skill knows the difference.
The one thing: Optimization needs traffic volume to mean anything. On a page with 50 visits a month, there's nothing to optimize yet.
10. audience-mapper — 9.0/10
Target audience analysis and persona construction.
Why: Personas built from stated behavior and motivations rather than demographics-plus-vibes. The output is a research artifact you can actually test against, not a mood board.
The one thing: Garbage in, garbage out — it needs real inputs: customer interviews, support tickets, survey data. What you feed it is the ceiling.
The pattern
The whole family shares one design principle: marketing decisions get a test design, not an opinion. Message testing, ad testing, landing optimization, audience analysis — every skill converts a judgment call into an experiment you can run. That's what a marketing skill should do: not write your copy, but make your thinking more rigorous.
Full scorecards are on the marketing collection page.
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