Claude Skills and Plugins, Explained in Plain English
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A Claude skill is a set of written instructions that teaches Claude how to do a specific job your way — like an SOP you'd hand a new employee. A plugin is the binder: a bundle of skills, commands, and tool connections you install once so Claude shows up already trained for your business.
If you've ever explained the same task to an AI chat window for the fourth time, this is the fix. Here's what each piece is, what it does for a business, and what to watch out for.
What is a Claude skill?
A Claude skill is a document that teaches Claude how to do one job to your standard — your steps, your rules, your tone. Think of the SOP or checklist you'd hand a new hire: "here's how we chase overdue invoices, here's the tone, here's when to escalate." Write that once as a skill, and Claude follows it every time without being re-told.
Concrete example: a skill that writes your invoice-chase emails the way you would — friendly on day 7, firm on day 30, and it never threatens a customer you flagged as a keeper. You wrote the rules once. Now the routine runs itself.
The point isn't the technology. It's that the fourth, fortieth, and four-hundredth time the task comes up, the work is already trained.
What is a plugin?
A plugin is the binder that holds it all: a package of related skills, ready-made commands, and connections to outside tools, installed in one step. If a skill is one SOP, a plugin is the full operations manual for one area of your business — plus the keys to the filing cabinets it needs.
Open the binder and you'll find three compartments:
/seo-audit, that kick off a defined job.[VISUAL: "Anatomy of a plugin" diagram — one binder-shaped box with three labeled compartments: Skills (SOPs), Commands (shortcuts), Tool connections (MCP). Simple, brand palette.]
Skills vs. plugins vs. MCP servers — what's the difference?
Skills are the instructions, MCP servers are the tool access, and plugins are the package that bundles both. Here's the clean version:
| Skill | Plugin | MCP server | |
|---|---|---|---|
| What it is | Written instructions for one job | A bundle: skills + commands + connections | A connector to one real tool (CRM, calendar, data source) |
| Plain-English version | An SOP | The binder of SOPs, plus the keys | The standard plug into a filing cabinet |
| What it gives Claude | Know-how | Everything for one area, in one install | Live data and the ability to act in that tool |
| How you get it | Written, or installed inside a plugin | Installed once from a marketplace | Usually comes wired into a plugin |
If you want the full story on that third column, it gets its own explainer: What is an MCP server?
What can a business actually do with them?
A plugin turns Claude from a general assistant into a specialist that already knows your playbook. Real examples from our own marketplace:
- SEO audits on live data. The seo-aeo-geo plugin runs site crawls, keyword research, and AI-visibility checks using current search data — not a chatbot's memory of the internet. One command, a real report.
- A second brain that answers back. The obsidian-second-brain plugin connects Claude to your notes, so "what did we decide about that client in March?" gets answered from your own records.
- Projects that start planned. The project-launcher plugin takes a rough idea and turns it into a researched, stress-tested spec before anything gets built.
- Consistent client work. Skills that carry your brand voice, your onboarding steps, your delivery checklists — so the output sounds like you on the intern's laptop too.
The pattern across all of them: hours back on work you were doing by hand, and a standard that holds when you're not looking.
Go deeper: Rhize plugins for Claude Code — the complete guide — Jim walks through all six plugins in the marketplace, what each one does, and how they fit together.
Are they safe to install?
Mostly yes — but treat a skill like what it is: a stranger's instructions that your AI will follow. You wouldn't hand a new contractor the keys and an unread set of orders from someone you've never met. Same logic here. A badly written skill wastes time; a malicious one could tell your AI to do things you'd never approve.
The fix isn't fear — it's a vetting step. Install from sources you trust, read what a skill actually does before it runs, and quarantine anything third-party until it's been checked. We built tooling for exactly this: Skill Forge scans and quarantines outside skills before they're promoted into use.
Go deeper: Skill Forge: a security gate for agent skills — how the quarantine-scan-promote pipeline works.
Go deeper: The rhize-meta plugin — the governance layer that vets external skills and sharpens internal ones.
Where do you get them?
From plugin marketplaces — public catalogs you connect to Claude Code, then install from with a single command. Rhize runs one: six free plugins covering SEO, note systems, project planning, engineering standards, team ops, and skill safety.
Installing takes about a minute. You add the marketplace once — /plugin marketplace add https://github.com/Rhize-Media/rhize-plugins — then install whichever plugins you want, individually. They work in both Claude Code and Cowork, and everything in ours is free. If you're not sure what Claude Code is in the first place, start here.
Frequently Asked Questions
Are Claude skills free?
Do skills work in the Claude app, or just Claude Code?
Can Claude write its own skills?
What happens if two skills conflict?
Ready to see what a trained-up Claude looks like? Browse the Rhize plugin marketplace — six free plugins, install in a minute, keep whatever's useful. And if you'd rather talk through what to install for your business first, book the 15-minute call. No pitch — you leave with a plan.
Want this working in your business — not just on paper?
Book a 30-min call and we'll map exactly where your business depends on you, and what to fix first. No pitch — you leave with a plan either way.
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