A skill gives Claude rules and tools for one specific job. All five here are open source, cost nothing and install with a single command. Copy it, paste it into Claude, done.
Claude Code has a built-in way to do this. You add the source once, then install the skill from it. Both go straight into your running Claude session, not into the terminal.
Claude Code on your machine. If you do not have it yet, that takes about ten minutes: setting Claude up properly.
The official collection from Anthropic.
document-skills is the one for everyday office work/plugin marketplace add anthropics/skills /plugin install document-skills@anthropic-agent-skills
Websites that do not look AI-made.
/plugin marketplace add nextlevelbuilder/ui-ux-pro-max-skill /plugin install ui-ux-pro-max@ui-ux-pro-max-skill
Find the bugs before your customer does.
claude mcp add playwright npx @playwright/mcp@latest
Playwright is not a skill, it is an MCP server. That is why the command looks different and runs in the terminal rather than in the Claude session. The result is the same: afterwards Claude can drive a browser.
Research in minutes instead of hours.
/plugin marketplace add mvanhorn/last30days-skill /plugin install last30days@last30days-skill
Copy, CRO and ads as ready-made workflows.
/plugin marketplace add coreyhaines31/marketingskills /plugin install marketing-skills@marketingskills
Star counts and licences checked on 12 August 2026. All five projects are open source and belong to their respective authors.
One skill you actually use every day for a week is worth more than five you try once and forget. Take the one that matches the work costing you the most time this week.
Setting it up is not the hard part. The hard part is knowing which rules you want to give Claude in the first place. That is exactly the part I work through with people.
I post another skill on Instagram every second day, and the full guide always ends up here on the site, free and without a signup.