Build Claude Code skills that are genuinely intelligent — not just format-valid, but skills that exploit something specific about how Claude works.
Skillbuilder is a community-contributed Claude Code skill in the red-team sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/skillbuilder/ and loads when your prompt matches the skill's trigger.
The Skillbuilder Claude Code skill is built for security engineers, penetration testers, DevSecOps practitioners, and development teams hardening codebases and infrastructure. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 69,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).
mkdir -p ~/.claude/skills/skillbuilder curl -L https://claudskills.com/skills/skillbuilder/SKILL.md \ -o ~/.claude/skills/skillbuilder/SKILL.md
Or just download SKILL.md directly and drop it into ~/.claude/skills/skillbuilder/. Claude Code auto-discovers it on next session.
Skills live at ~/.claude/skills/skillbuilder/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\skillbuilder\SKILL.md on Windows. See the full install guide for step-by-step instructions.
The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.
For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.
Browse all Security skills in the ClaudSkills registry, or explore these other picks from the same category:
Part of Acreator Store — Adam Lankamer's AI tools: PerfectStudio · Ucaption · UTagger · AutoXPoster · TestYourSkills · AutomationFlows · Au Naturel
SKILL.md files, not affiliated with, endorsed by, or sponsored by Anthropic.