Guides built on test data
The SkillProof blog
No recycled GitHub descriptions. Every guide leans on what we learn testing skills on real work — including the failures.
The 15 Best Claude Skills in 2026 — Tested and Scored
We installed and tested 45+ Claude skills on real work. These 15 earned the highest SkillProof scores, with test notes, scores out of 10 and install commands.
Read the guide →What Are Claude Skills? The Complete Guide (2026)
Claude skills explained: what they are, how they differ from prompts and MCP, where they live on disk, and how to pick ones that actually work.
How to Install Claude Skills: Claude Code, Desktop & Projects (2026)
Step-by-step guide to installing Claude skills: global vs project install, plugin marketplaces, troubleshooting skills that don't trigger, and uninstalling.
Claude Skills vs MCP Servers: What's the Difference and When to Use Each
Skills change how Claude thinks; MCP servers change what it can touch. A practical guide to choosing between them, with real examples of combining both.
Claude Skills for Marketing: The Tested Stack (2026)
The marketing skills that survived real testing: SEO audits, copywriting, email sequences, A/B testing. What to install, in what order, and what to skip.
Claude Skills for Sales Teams: Outbound That Gets Replies (2026)
Sales skills tested with live sends and real accounts: cold email, account research, call prep, pipeline review. What earned replies and what to avoid.
How to Write Your Own Claude Skill: SKILL.md From Scratch
A practical guide to authoring Claude skills: SKILL.md anatomy, trigger descriptions that actually fire, reference files, testing and distribution.
Why Half of Claude Skills Don't Work — Data From Testing 45+ of Them
Install failures, dead triggers, output no better than baseline: what we learned scoring 45+ Claude skills, and how to spot a broken skill before installing.
How to Cut Claude Token Costs: The Efficiency Playbook (2026)
Practical ways to reduce Claude API and Claude Code token spend: context discipline, prompt caching, compression skills — with what actually moves the bill.
Claude Skills Security: Hidden Risks and a Pre-Install Checklist
Skills are third-party instructions for your AI. Prompt injection, hidden network calls, data exfiltration patterns — and the 2-minute check before installing.