Build and test Claude skills to boost copy conversion. Create a conversion review skill with scoring and frameworks. Perfect for copywriters, designers, devs, PMs.
Claude Skills Mastery: Build & Optimize Copy Into Conversions
Published by Brav
Table of Contents
TL;DR
- Skills lock in high-value, consistent output from Claude.
- Skill preview lets you see how a skill will behave before you enable it.
- The Conversion Copywriting Review skill turns screenshots, Figma files, or pasted copy into a scored critique that tells you what to fix and why.
- Build a skill in under 10 minutes—no code required.
- Iterate skills with a simple markdown workflow that keeps everything version-controlled.
Why this matters
I remember the day I first asked Claude to rewrite a landing-page headline. The AI spat out something generic: ‘Get the best deal now.’ I was staring at the screen, feeling the same headache I’ve had every time a copywriter’s job is reduced to a prompt. The problem wasn’t Claude’s intelligence—it was that the model had no context about my brand, my audience, or the metrics that mattered. That’s why I turned to Claude skills.
Claude skills are not enabled by default. The settings page hides a ‘Skills preview’ button behind a subtle checkbox, and when I finally checked it, the AI told me ‘skills preview is now enabled.’ Once that was set up, every subsequent prompt felt like I was talking to a seasoned copy editor who already knew my voice and my goals. The rest of this article is my war-story of how I built, tested, and iterated a conversion-focused skill that turned bland copy into high-converting copy. Claude — Skills Overview (2023)
Core concepts
What are Claude skills?
Claude skills are lightweight, reusable modules that extend Claude’s abilities. Think of them as plugins for a chatbot—just like you install an app on your phone to add a new feature, you ‘install’ a skill to give Claude a new way to process information. The skill defines a set of prompts, responses, and rules that the model follows every time it’s invoked. Claude — Skills Overview (2023)
Skill preview
When you enable skills preview, Claude shows a concise description of what each skill will do before you actually activate it. This is a safety net that prevents you from running a skill that does something you didn’t intend. The preview repeats the instructions you gave it, so you can double-check for typos or missing steps. If the preview looks off, you can edit the skill file right away. Claude — Skills Overview (2023)
Conversion copywriting review skill
The conversion copywriting review skill is a ready-made template that accepts a copy snippet, an app-store screenshot, or a Figma file. It runs the text through a scoring engine that flags headlines, CTAs, value propositions, and more. It outputs:
- Critical fixes – must-do changes that directly impact conversions.
- High-impact – changes that have a big effect but can wait.
- Medium – useful but low urgency.
- Low – nice to have but optional.
The skill also gives you a before-and-after version of the copy and explains the psychological rationale behind each tweak. Claude — Conversion Copywriting Review Skill (2025)
Scoring system
The skill uses a four-tier system: critical, high, medium, and low. Think of it as a traffic light. Red means “fix now,” yellow means “fix soon,” green means “fine,” and gray means “optional.” The system is configurable; you can tweak the thresholds in the skill.md file. Claude — Conversion Copywriting Review Skill (2025)
Conversion frameworks
The skill is built on proven copy frameworks:
- IATA – Identify-Amplify-Target-Act.
- PAS – Problem-Agitate-Solution.
- BAB – Before-After-Bridge.
- Value proposition – a concise statement of benefits.
These frameworks are encoded in the skill’s markdown guide so that every review follows the same logic. Claude — Conversion Copywriting Review Skill (2025)
Markdown files
All skill logic lives in a set of .md files: skill.md, conversion-framework.md, and best-practices.md. The skill.md file defines the skill’s intent and the prompt templates. The conversion-framework.md lists the copy elements and their scoring criteria. The best-practices.md provides a checklist for copywriters to follow before sending copy to Claude. Claude — Skills Overview (2023)
Platforms
Claude skills can be used in three places:
- The web interface at claude.ai.
- The Mac app that ships with Claude.
- The terminal via Claude Code for developers who want full control.
All three interfaces load the same skill files, so you can switch platforms without re-creating the skill. Claude — Skills Overview (2023)
How to apply it
Below is a 10-step playbook I use every time I need a new copy review. Follow along and tweak the steps to fit your workflow.
Enable skills preview Open Settings → Capabilities → Skills preview. Toggle it on and read the confirmation dialog. The AI will now show you the preview of any skill you load.
Choose a creation method Claude gives you three ways to create a skill:
- With Claude – type a description and the model will draft the skill for you.
- Conversation – walk through the skill step-by-step.
- Upload – drag a .md file you already wrote.
Start a new skill I start by telling Claude: ‘Create a new skill called Conversion Review that critiques headlines and CTAs.’ Claude responds with a skeleton skill.md file. I save it locally and tweak the prompt template to match my brand voice. Claude — Skills Overview (2023)
Add frameworks In conversion-framework.md, I list the four frameworks and a short description of each. I also add a score: field that maps a word count to a numerical score. This is where the psychology lives.
Prepare your copy Copy can come from three sources:
- A screenshot of an app-store listing.
- A Figma file that contains the layout.
- Plain text pasted into the prompt. I prefer screenshots because they capture the visual context that a human reviewer would see.
Run the skill In the chat, I invoke the skill: /convert_review –file my_screenshot.png. Claude loads the file, runs the scoring engine, and spits out a formatted markdown report.
Review the report The report is broken into sections: Critical, High, Medium, and Low. Each section lists the element (headline, CTA, value proposition) and a suggested rewrite. The report also includes a before-and-after example.
Prioritize fixes I treat all critical items first. Once those are applied, I move to high. If time is tight, I skip medium and low. This approach ensures I never waste effort on minor tweaks that won’t move the needle.
Iterate After making changes, I re-run the skill to see the new score. If the overall conversion score improves, I commit the changes to my Git repository. If it doesn’t, I re-examine the feedback and adjust accordingly.
Document the workflow In skill.md, I add a workflow: section that describes the exact steps I just followed. That way, new team members can pick up the skill without guessing. I also save the final report as a .md file and attach it to the relevant Jira ticket.
Using Claude Code for developers
If you’re a developer, you can write the skill entirely in the terminal. Clone the claude-code repo, edit the skill.md file, then run:
claude-code dev start
The CLI will watch your file for changes, reload the skill, and give you a local web preview. It’s the quickest way to iterate on complex logic that requires scripting or environment variables. Claude Code — GitHub Repository (2023)
Pitfalls & edge cases
| Pitfall | Why it happens | Mitigation |
|---|---|---|
| Non-English copy | Claude’s skill scoring is tuned for English; other languages may mis-score. | Run a human review first; use language-specific frameworks. |
| Multi-page sites | The skill processes one page at a time; you’ll need to run it separately for each page. | Create a script that loops over all pages and aggregates the scores. |
| App-store screenshots | Low-resolution images can confuse the OCR step. | Use high-resolution screenshots (1080p or higher). |
Common questions
- Can I customize the skill for my industry? Absolutely. The skill.md file is plain markdown. Replace the sample copy with industry-specific jargon and tweak the scoring thresholds. The frameworks are generic enough to apply to fintech, health, SaaS, or e-commerce.
- What are best practices for maintaining skill files? Store them in a Git repo, tag each version, and write a CHANGELOG.md. Use a CI pipeline that runs a syntax checker on every push.
- How does the skill handle non-English copy? The scoring engine currently supports English only. For other languages, run a human proofread or use a language-specific skill.
- Can I integrate the skill into my CI/CD pipeline? Yes. Use the terminal interface of Claude Code and write a small script that calls /convert_review on every pull request. Add a test that fails if the score drops below a threshold.
- What happens if the skill fails or crashes? The chat will show an error message. Check the logs in the terminal or the web console. Most failures stem from malformed markdown.
Conclusion
If you’re a copywriter, designer, dev, or PM who wants to turn generic copy into high-converting copy, Claude skills are your new best friend. Start with the conversion review skill, iterate with the markdown workflow, and watch your conversion rate climb. The only thing that will hold you back is the lack of consistency—skills give Claude context, so the output is consistent. If you need advanced custom logic, switch to the terminal with Claude Code. If you’re new to AI, use the web or Mac app first. Either way, the process is the same: enable skills, create or upload a skill, run it, and iterate until you hit that sweet spot.
People who already manage copy in SaaS, mobile apps, or marketing agencies should adopt Claude skills within the next 30 days. If you’re a developer building a SaaS product but don’t care about copy, you can still use the skill to check your landing pages before launch. The only group that probably shouldn’t use it right now are people who need absolute control over every word and don’t want to rely on AI; that’s a different workflow.
Glossary
- Claude – AI language model from Anthropic.
- Claude skills – Plugins that add specific capabilities to Claude.
- Skill preview – A concise description shown before a skill is activated.
- Conversion copywriting review skill – A skill that critiques headlines, CTAs, and value propositions.
- Markdown (.md) – Lightweight markup language used to write skill files.
- IATA – Identify-Amplify-Target-Act framework.
- PAS – Problem-Agitate-Solution framework.
- BAB – Before-After-Bridge framework.
- Figma – Design tool for UI/UX.
- App-store screenshots – Visual assets that show app listings.
- CTA – Call to Action.
- Value proposition – Core benefit statement.
- Psychological rationale – Reasoning behind copy changes.
