In legal academia, preemption means someone already published your claim. A YLJ piece that repeats an existing argument is dead on arrival — student editors and the faculty they consult are reading the same SSRN feeds. This skill runs the search systematically and turns the result into the manuscript's "what's new" paragraph. It assumes the claim is already sharp (ylj-thesis-and-contribution).
Ylj Preemption Check is a community-contributed Claude Code skill in the general-misc sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/ylj-preemption-check/ and loads when your prompt matches the skill's trigger.
When to invoke it: Use when verifying that a The Yale Law Journal (YLJ) claim is genuinely novel and not preempted by prior scholarship. It runs the systematic SSRN/Westlaw/HeinOnline search and writes the "what's new" paragraph; it does not draft the thesis (use ylj-thesis-and-contribution).
The Ylj Preemption Check Claude Code skill is built for Claude Code users and developers across all disciplines looking for general-purpose AI assistance. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 174,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).
mkdir -p ~/.claude/skills/ylj-preemption-check curl -L https://claudskills.com/skills/ylj-preemption-check/SKILL.md \ -o ~/.claude/skills/ylj-preemption-check/SKILL.md
Or just download SKILL.md directly and drop it into ~/.claude/skills/ylj-preemption-check/. Claude Code auto-discovers it on next session.
Skills live at ~/.claude/skills/ylj-preemption-check/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\ylj-preemption-check\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/ylj-preemption-check/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. Ylj Preemption Check is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the General 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{ylj-preemption-check-2026,
author = {brycewang-stanford},
title = {Ylj Preemption Check [Claude Code skill]},
year = {2026},
publisher = {ClaudSkills},
url = {https://claudskills.com/skills/ylj-preemption-check/}
}Grade A · scanned 2026-08-02 — free static scan against the OWASP Agentic Skills Top 10.
The scan flagged 1 of 10 categories (filesystem), including lower-severity patterns. Patterns shown inside code fences are weighted as examples rather than instructions — read the grading methodology for what this does and does not guarantee.
Browse all General 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.