Free legal-research skills and Claude plugin from DingDuff — built by lawyers, for lawyers. Also home to the DingDuff installation & help wiki.
Skill Claude CodeCodex
Verify every citation in a drafted legal memo (Markdown, Word, or Google Docs) against stored opinions and statutes plus any other source documents the attorney supplies (a Restatement section, an off-CourtListener case, an opposing brief, a factual PDF). Use after drafting a memo when the user asks to cite-check…
Skill Claude CodeCodex
Analyze a legal question rigorously and produce a citation-anchored analysis or proof skeleton — frame the issues, synthesize the governing rule, analyze the facts, organize the proof (CRAC/CREAC), and deploy authority. Use for ANY legal-reasoning task — "what's the law on X," "do we have a claim," "will this hold…
Skill Claude CodeCodex
Format legal citations in the style courts expect (briefs, motions, memoranda, pleadings). Use when drafting, inserting, or fixing a citation to a case, statute, constitution, regulation, rule, secondary source (treatise, law review, etc), or a same-matter filing — or when a draft needs signals (e.g. see, cf., but…
Skill Claude CodeCodex
Research the law on a question — find, retrieve, read, and validate the controlling cases, statutes, and regulations; map the citation network and the statutory landscape; and verify everything is still good law. Use for ANY legal-research task — "what's the law on X," "find cases/statutes on Y," "research precedent,"…
Skill Claude CodeCodex
Confirm whether a specific case is still good law before an argument rests on it. ALWAYS RUN IN A SUBAGENT (use Opus) — never in the main context window. Subagent will return the valid/invalid finding. Driven by the opinionverify tool, with a docket check via the PACER tools for federal origins. Use on ANY…