cro Skill for Claude: Conversion Rate Optimization for Pages and Forms

Makes Claude audit a marketing page or form for conversion problems and return a ranked list of fixes and tests.

Installs: 95.2K; on skills.sh
Stars: 57.9K; on GitHub
Files: 3; besides SKILL.md
Updated: Oct 2026; last repo commit

cro turns Claude into a conversion rate optimization reviewer. It checks a homepage, landing, pricing, feature page or form across seven areas in order of impact, from value proposition and headline to CTA, trust signals, objections and friction. It answers with Quick Wins, High-Impact Changes, Test Ideas and Copy Alternatives.

It triggers on phrases like "this page isn't converting" or when you share a URL and ask for feedback. Form problems load references/form.md, and page experiment ideas load references/experiments.md. It bundles no scripts, and it asks about your current conversion rate, traffic sources and what you have already tried.

Good for

Founders and marketers with a page that is not converting
Growth teams planning A/B tests
Anyone fixing a lead or contact form that people abandon

Install cro

Claude Code

Copy this prompt.

Install the cro skill in Claude Code. Run this command:

npx skills add coreyhaines31/marketingskills --skill cro -a claude-code

Then check that it loaded and tell me how to use it.

2
Paste it into Claude Code. It shows the change and asks before running it.

Requires Node.js.

The skills CLI route takes cro alone. The plugin installs the whole marketing-skills set, which the repo's marketplace.json describes as 53 skills.

From the project README. Source.

What's in the skill

When it loads

When the user wants to optimize, improve, or increase conversions on any marketing page or form — including homepage, landing pages, pricing pages, feature pages, lead capture forms, or contact forms. Also use when the user says 'CRO,' 'conversion rate optimization,' 'this page isn't converting,' 'improve conversions,' 'why isn't this page working,' 'my landing page sucks,' 'form abandonment,' 'nobody's converting,' 'low conversion rate,' or 'this page needs work.' Use this even if the user just shares a URL and asks for feedback. For signup/registration flows, see signup. For post-signup activation, see onboarding. For popups/modals, see popups.

Sections in SKILL.md

Reference Routing
Initial Assessment
CRO Analysis Framework
1. Value Proposition Clarity (Highest Impact)
2. Headline Effectiveness
3. CTA Placement, Copy, and Hierarchy
4. Visual Hierarchy and Scannability
5. Trust Signals and Social Proof
6. Objection Handling
7. Friction Points
Output Format
Quick Wins (Implement Now)
High-Impact Changes (Prioritize)
Test Ideas
Copy Alternatives
Page-Specific Frameworks

Key facts

Author: Corey Haines (coreyhaines31)
Repository: coreyhaines31/marketingskills
Installs on skills.sh: 95,164 (crawled 2026-11-02)
GitHub stars: 57,855 (whole repo)
License: MIT
Last repo commit: 2026-10-31
Files in the skill folder: 4 files: SKILL.md, evals/evals.json and 2 reference files. No scripts.
skills.sh audits: Gen Agent Trust Hub: pass, Socket: pass, Snyk: warn
Works in (per README): Claude Code, OpenAI Codex, Cursor, Windsurf and other Agent Skills agents

What it includes

Identifies page type, primary conversion goal and traffic context
Initial assessment
Seven checks in order of impact, from value proposition to friction points
CRO analysis framework
Short checklists for homepage, landing, pricing, feature and blog pages
Page-specific frameworks
Quick Wins, High-Impact Changes, Test Ideas and Copy Alternatives
Output format
Form field, layout, error, trust and measurement guidance
Read · references/form.md
Experiment ideas by page type; points to ab-testing for test design
Read · references/experiments.md

From the official docs

Permissions

Low risk

cro gives Claude an analysis checklist for pages you share. Both findings above concern what gets installed and which local file it reads.

What it can do

Read your data
Create and change things
Delete things
Read-only mode

Watch out for

The plugin route installs the whole set
/plugin install marketing-skills adds every skill in the repo (53 per the marketplace file), not only cro. Use the skills CLI command to take cro alone.
It may read your product context file
SKILL.md has Claude read .agents/product-marketing.md (or the .claude/ or older file name) if it exists, then ask only what is missing.

Questions

What does the cro skill do?

It makes Claude review a marketing page or form for conversion problems. It checks value proposition, headline, CTA, visual hierarchy, trust signals, objections and friction, then lists quick wins, bigger changes, test ideas and copy alternatives.

How do I install it?

Use the install box at the top of this page. The README says the skills CLI may install only to .agents/skills/ when run from inside an agent session, which Claude Code does not read, so pass -a claude-code there. It also documents a Claude Code plugin, a Codex plugin and Claude web ZIPs.

Does it work in Codex or Cursor?

The README says the collection works with Claude Code, OpenAI Codex, Cursor, Windsurf and any agent that supports the Agent Skills spec.

Do I need the other marketing skills?

No. SKILL.md has Claude read .agents/product-marketing.md first if it exists (the .claude/ and older file names also work), then ask only what is missing. The README's product-marketing skill is the one that creates that file. SKILL.md also names signup, popups, copywriting and ab-testing as related skills for nearby jobs.

Does it need an API key or analytics access?

No key is named in SKILL.md. It asks you questions such as your current conversion rate and traffic sources, and uses a URL or page you share.

Is it safe?

It bundles no scripts. Its folder holds SKILL.md, an evals file and two reference files, and the skill is written as analysis and recommendations.

Information

updated Nov 2, 2026

Repository: coreyhaines31/marketingskills
Folder: skills/cro

coreyhaines31/marketingskills skills.sh

Sources

Docs, issue trackers and discussions this page is built from.

Show all 5

marketingskills README · github.com
marketplace.json · github.com
cro SKILL.md · github.com
form.md · github.com
experiments.md · github.com