Lean Mwe

Q: What is a Claude Code skill and how does the Lean Mwe skill fit in?

A Claude Code skill is a 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. Lean Mwe is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Product category. Learn more at https://claudskills.com/learn/what-is-skill-md/.

Category: Product · Sub-category: product-misc · Last updated: 2026-05-30

type:debug

USE FOR: creating minimal working examples (MWEs) from Lean 4 errors for upstream bug reports, capturing diagnostics with `#guard_msgs`, capturing panics with `#guard_panic`, running `lake exe minimize`, resuming long minimisations with `--resume`, verifying repros with `lake env lean`. DO NOT USE FOR: bisecting which Lean version introduced the bug (use @lean-bisect after MWE), building or validating the live project (use @lean-build), repairing the proof itself (use @lean-proof), filing the report (use @lean-pr after MWE + bisect). TRIGGERS: MWE, minimal repro, "minimise the error", "#guard_msgs", "#guard_panic", `lake exe minimize`, upstream bug report.

Security AStatic scan found no risk patternsHow grading works ›

What this skill does

Lean Mwe is a community-contributed Claude Code skill in the product-misc sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/lean-mwe/ and loads when your prompt matches the skill's trigger.

Who uses this skill

The Lean Mwe Claude Code skill is built for product managers, product designers, and cross-functional teams planning, shipping, and measuring product features. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 196,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/lean-mwe
curl -L https://claudskills.com/skills/lean-mwe/SKILL.md \
  -o ~/.claude/skills/lean-mwe/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/lean-mwe/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/lean-mwe/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\lean-mwe\SKILL.md on Windows. See the full install guide for step-by-step instructions.

📱 Install from your phone or desktop Telegram

Open @claudskills_bot on Telegram, tap Open Desktop App, and the desktop app installs this skill for you. Or share the bot link with a colleague — they get the same one-tap install. Learn more →

Pro

One-click install via the desktop app

The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.

Pro

For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.

See pricing → Download desktop app

Frequently asked questions

How do I install the Lean Mwe Claude Code skill?

Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/lean-mwe/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.

What does the Lean Mwe skill do?

Is this skill free to install?

Yes. ClaudSkills is an open registry — every skill keeps its source repository's license, and manual install via copy is free. ClaudSkills Pro ($9/mo, $79/yr, or $149 one-time) adds one-click install via the desktop app and a multi-signal Quality Score.

When should I use the Lean Mwe skill?

Use Lean Mwe when your Claude Code task falls under the Product category — specifically in the product misc area. Claude Code auto-discovers installed skills and invokes the right one based on the task description, so you can also ask Claude directly (e.g. "use Lean Mwe" or describe the task and let Claude pick). Browse related skills at /category/product/.

What is a Claude Code skill and how does the Lean Mwe skill fit in?

A Claude Code skill is a 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. Lean Mwe is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Product category. Learn more at /learn/what-is-a-claude-skill/.

Attribution & license

Source: https://github.com/r-irbe/proof-skills/blob/HEAD/skills/_overrides/lean-mwe/SKILL.md
License: Apache-2.0
Author: r-irbe
Website: https://github.com/r-irbe/proof-skills

Cite this skill

If you reference this skill in a blog post, paper, or documentation, you can cite it as:

APA

r-irbe. (2026). Lean Mwe [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/lean-mwe/

BibTeX

@misc{lean-mwe-2026,
  author    = {r-irbe},
  title     = {Lean Mwe [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/lean-mwe/}
}

Embed this skill

Promote, attribute, or link this skill from your own README, blog post, or documentation. All three snippets are free to use — no sign-up, no API key. More distribution surfaces →

Badge

[![ClaudSkills](https://claudskills.com/badge/lean-mwe.svg)](https://claudskills.com/skills/lean-mwe/?utm_source=badge&utm_medium=readme&utm_campaign=skill_badge)

Security scan

Grade A · scanned 2026-09-28 — 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.

✓ Prompt injection
✓ Data exfiltration
✓ Supply chain
✓ Reverse shell
✓ Credentials
✓ Execution
⚠ Filesystem
✓ Persistence
✓ Obfuscation
✓ Network

Show this grade on your repo (click to copy):

[![Security: A](https://img.shields.io/badge/Security-A-2e7d32)](https://claudskills.com/skills/lean-mwe/#security)

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Browse all Product skills → Top 100 skills

Part of ClaudSkills — the open registry for Claude Skills & Claude Code Skills. · What's New · Install guide · About · llms.txt

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