First-principles analysis recipes for libsync (as of 2026-07-03, v0.0.6). The house rule this skill enforces: prove it, don't just install it. Before you accept a root cause or ship a fix, run an experiment whose result can only be explained by one mechanism. Every recipe below ends in a check you can run read-only, and each carries a worked example from this repo's real history.
Libsync Proof And Analysis Toolkit is a community-contributed Claude Code skill in the web-security sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/libsync-proof-and-analysis-toolkit/ and loads when your prompt matches the skill's trigger.
When to invoke it: Use when about to accept a root cause or "just try a fix" on libsync and want to PROVE it first — a Qobuz 401 that could be expired token vs app-id mismatch vs bad signing secret, a "library loads but downloads 401" split-brain, deciding if an SDK secret is valid without live guessing, a frontend event that never arrives, git history that looks wrong after the 2026-04-14 reroot, or SQLite state disagreeing with the UI.
The Libsync Proof And Analysis Toolkit 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 153,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).
mkdir -p ~/.claude/skills/libsync-proof-and-analysis-toolkit curl -L https://claudskills.com/skills/libsync-proof-and-analysis-toolkit/SKILL.md \ -o ~/.claude/skills/libsync-proof-and-analysis-toolkit/SKILL.md
Or just download SKILL.md directly and drop it into ~/.claude/skills/libsync-proof-and-analysis-toolkit/. Claude Code auto-discovers it on next session.
Skills live at ~/.claude/skills/libsync-proof-and-analysis-toolkit/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\libsync-proof-and-analysis-toolkit\SKILL.md on Windows. See the full install guide for step-by-step instructions.
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SKILL.md from the source repository to ~/.claude/skills/libsync-proof-and-analysis-toolkit/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Libsync Proof And Analysis Toolkit is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Security category. Learn more at /learn/what-is-a-claude-skill/.If you reference this skill in a blog post, paper, or documentation, you can cite it as:
@misc{libsync-proof-and-analysis-toolkit-2026,
author = {arthursoares},
title = {Libsync Proof And Analysis Toolkit [Claude Code skill]},
year = {2026},
publisher = {ClaudSkills},
url = {https://claudskills.com/skills/libsync-proof-and-analysis-toolkit/}
}Grade A · scanned 2026-07-18 — free static scan against the OWASP Agentic Skills Top 10.
No risk patterns were found in any of the ten OWASP-aligned categories. How grading works ›
Browse all Security skills in the ClaudSkills registry, or explore these other picks from the same category:
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SKILL.md files, not affiliated with, endorsed by, or sponsored by Anthropic.