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Lean Formalize

Lean Formalize is an agent skill (a SKILL.md file) from wanshuiyin/Auto-claude-code-research-in-sleep. Develop and verify a mathematical proof in Lean, continue an incomplete Lean project, or audit whether it proves the original statement. It works with Claude Code and Codex and has 18,089 GitHub stars across a repository of 5 listed skills.

github.com/wanshuiyin/Auto-claude-code-research-in-sleep/skills/lean-formalize (opens in a new tab)

Data as of from the GitHub API; description from the skill's SKILL.md. Report an error

View on GitHub (opens in a new tab)

Add this skill

Claude

This repository is a Claude Code plugin marketplace. In Claude Code:

/plugin marketplace add wanshuiyin/Auto-claude-code-research-in-sleep
/plugin install aris@aris

In the Claude apps, zip the lean-formalize folder and upload it under Customize > Skills > + > Upload a skill (code execution must be on).

ChatGPT / Codex

Codex reads skills from .agents/skills/ in a repo or ~/.agents/skills/ for every project:

git clone --depth 1 https://github.com/wanshuiyin/Auto-claude-code-research-in-sleep.git
cp -r Auto-claude-code-research-in-sleep/skills/lean-formalize .agents/skills/lean-formalize   # repo; ~/.agents/skills for all projects

Standalone skills also load in the ChatGPT desktop app.

Cursor

Cursor loads skills from .cursor/skills/ (or ~/.cursor/skills/) and also reads .claude/skills/:

git clone --depth 1 https://github.com/wanshuiyin/Auto-claude-code-research-in-sleep.git
cp -r Auto-claude-code-research-in-sleep/skills/lean-formalize .cursor/skills/lean-formalize   # project; ~/.cursor/skills for all projects

Source (checked Oct 7, 2026): code.claude.com/docs/en/skills (opens in a new tab), code.claude.com/docs/en/plugin-marketplaces (opens in a new tab), support.claude.com/en/articles/12512180-using-skills-in-claude (opens in a new tab), learn.chatgpt.com/docs/build-skills (opens in a new tab), cursor.com/docs/context/skills (opens in a new tab)

What this skill does

Develop and verify a mathematical proof in Lean, continue an incomplete Lean project, or audit whether it proves the original statement. Connect actual inputs to intermediate lemmas, assemble the target theorem, check its transitive axioms, and provide a reproducible handoff. Use when Lean is requested or a specific proof obligation benefits from formal verification; use proof-writer for ordinary mathematical drafting.

When it triggers

  • Use when Lean is requested or a specific proof obligation benefits from formal verification; use proof-writer for ordinary mathematical drafting.

More skills in wanshuiyin/Auto-claude-code-research-in-sleep

5 skills are listed from this repository.

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FAQ

Lean Formalize FAQ

Still curious? Email info@appsgit.com.

How do I install the Lean Formalize skill?

In Claude Code, run /plugin marketplace add wanshuiyin/Auto-claude-code-research-in-sleep and then /plugin install aris@aris. For Codex or Cursor, copy the lean-formalize folder into .agents/skills/ or .cursor/skills/.

Is the Lean Formalize skill free?

Yes. The repository is open source under the MIT license.

Is Lean Formalize maintained?

The repository's most recent commit was on Oct 24, 2026. Its latest release is v0.4.28. appsgit only lists skills from repositories with a commit in the last six months.