A list of dozens of Claude extensions usually solves the wrong problem: it's still unclear what to install first and why. The difference between a plugin, a skill and an MCP server isn't a formality — it's the question of "what exactly do I want to change about how I work with Claude". Let's go through it layer by layer, with real tool names and no inflated GitHub star counts — just a short note on what each tool actually does.
Three layers instead of one big pile
A plugin gives Claude a ready-made specialist for a specific area — development, legal processes, marketing. A skill turns a long prompt into a short command for a repeating task. An MCP server is a wire to an external service: Claude stops being just a chat and gets access to the things you use every day. One layer doesn't replace another — they solve different problems, and lumping them together into a single pile of "installs" makes no sense.
Plugins — a specialist for the job
A plugin isn't a single prompt but a package: commands, templates and logic for a specific area. You install it once, then invoke it as a separate working mode.
- gstack — a package of specialized development tools, something like a mini-team for frontend and backend tasks in one install.
- claude-for-legal — processes and templates for legal work: document analysis, standard wordings, checklists.
- marketingskills — a set for content and marketing scenarios: from campaign structure to copy.
- codex-plugin-cc — a bridge between Codex and Claude Code for people already working with both tools who don't want to maintain two separate contexts.
It's worth installing one plugin for the area where you actually work every day, not all of them at once "just in case" — otherwise you get lost in commands you almost never use.
Skills — a command instead of a wall of prompt
A skill is a formalized instruction that Claude picks up by name rather than from pasted text.
Technically it's a SKILL.md file with name and description fields, which Claude uses to figure
out when to switch this mode on.
- frontend-design — strips the typical "AI look" out of interfaces: cookie-cutter shadows, identical corner radii, a faceless grid.
- ai-second-brain — gathers conversations and decisions from your Claude history into a personal wiki instead of keeping it all in your head.
- humanizer — removes the recognizable "AI accent" from text drafts: bureaucratic connectives, the same sentence rhythm throughout.
- claude-seo — an SEO/GEO approach to text that accounts for the fact that it's increasingly read not only by search engines but by AI answer aggregators.
The difference from an ordinary prompt is felt right away: you don't have to remind the model each time what to do and in what tone — the skill holds that itself until you turn it off.
MCP servers — wires to real services
The MCP protocol gives Claude access to external systems directly, instead of through logs and screenshots pasted into the chat.
- slack — reads channels and posts updates without switching windows.
- notion — works with databases and documents: reads and updates them directly.
- zapier — one connector with thousands of external apps and automation scenarios behind it.
- perplexity — adds live web search inside the conversation when you need fresh data, not just the model's knowledge.
This is where the effect is most tangible: Claude stops being an isolated chat and starts seeing the real state of your tools.
How to choose instead of installing everything
The rule is simple: one plugin for your main work task, one skill for a routine that repeats at least once a week, one MCP server for a tool you already live in every day. Install it and test it on a real task immediately, rather than shelving it for "a look later". Twenty-four installs in one day almost guarantees that twenty of them will never be launched.
How we do it
We put together roundups like this after testing the tool on our own tasks, not by retelling a list of repositories. Our qvib engine for generating code and websites is built on the same layered principle: a base model plus separate layers of rules and integrations — rather than one giant instruction covering everything at once.
Related links
- The "Claude skills" section: qvib.pro/arsenal/skills/
- The "MCP servers" section: qvib.pro/arsenal/mcp-servers/
- Claude Code plugins and extensions: qvib.pro/arsenal/claude-code-plugins/