Matt Pocock's Skills
Coding Workflows
Proven engineering habits for Claude: grill your plan, write specs and tickets, then test.
Coding Workflows
Addy Osmani's Agent Skills
25 senior-engineer workflows from spec to launch, by Google's Addy Osmani.
FreeOpen sourceBy Addy Osmani
View source What is it?
Addy Osmani is a long-time engineering leader at Google. This pack covers the full life of a change in nine commands: /spec, /plan, /build, /test, /constraints, /review, /webperf, /code-simplify and /ship. Behind them sit 25 skills that switch on by themselves when the task fits, such as accessibility checks when you build a page.
Each skill is a checklist a senior engineer would follow, with steps that have to be proven before moving on. /build auto plans and builds a whole spec after one approval, still testing and committing each task separately.
It overlaps with Matt Pocock's skills and Superpowers. Pick this one if you want the most complete start-to-launch checklist, including web performance and launch steps.
Install in Claude Code
In Claude Code run /plugin marketplace add addyosmani/agent-skills, then /plugin install agent-skills@addy-agent-skills. If that fails with an SSH error, use /plugin marketplace add https://github.com/addyosmani/agent-skills.git instead. Other agents can use npx skills add addyosmani/agent-skills.
Try this prompt
Paste into Claude Code
/spec A client portal where my customers can log in, see their invoices and download receipts.Who it's for
People building websites and apps with Claude Code who want them done to a professional standard.
Best for
- Specs before code
- Web performance audits
- Security and launch checklists
- Code review before merging
Why it made the list
It's the most complete free set of engineering checklists, from someone who has spent years teaching web performance.
More skills like this
Superpowers
Coding Workflows
A full working method for Claude: brainstorm, plan, build with tests, then review.
Compound Engineering
Coding Workflows
Every's plan, build, review loop that writes down what it learns for the next job.
Frontend design
Design & Front-end
Makes the websites Claude builds look designed instead of generic.