# Lean Formalize (agent skill)

> 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 17,064 GitHub stars across a repository of 5 listed skills.

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.

## Key facts

| Fact | Value |
|---|---|
| Repository | https://github.com/wanshuiyin/Auto-claude-code-research-in-sleep |
| Skill path | skills/lean-formalize/SKILL.md |
| Skill name | lean-formalize |
| GitHub stars | 17,064 |
| Installs on skills.sh | not listed |
| License | MIT |
| Skills in repo | 5 |
| Plugin marketplace | aris |
| Official | no |
| Works with | Claude Code, Codex |
| Category | Security |
| Last commit | Oct 6, 2026 |

## When it triggers

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

## Add this skill

### Claude Code

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

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

### ChatGPT / Codex

```sh
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
```

### Cursor

```sh
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
```

Sources (checked 2026-10-07): https://code.claude.com/docs/en/skills, https://support.claude.com/en/articles/12512180-using-skills-in-claude, https://learn.chatgpt.com/docs/build-skills, https://cursor.com/docs/context/skills

---

Canonical page: https://appsgit.com/skills/wanshuiyin-lean-formalize
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