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.

About this skill (catalog notes)

Lean Mwe includes 8 code blocks for direct copy-paste. The SKILL.md runs to about 874 words, in the catalog's typical mid-range.

Source: github.com/r-irbe/proof-skills
License: Apache-2.0
Original author: r-irbe
Indexed lastmod: 2026-05-30
Catalog position: Product · product-misc
Indexed related skills: 10

How Lean Mwe fits the catalog

Lean Mwe sits in the Product category under the product-misc sub-topic in the ClaudSkills catalog. There are 10 related skills indexed alongside it; comparing a few before installing usually reveals which fits your workflow best.

These notes are auto-generated from features detected in the SKILL.md file and from this catalog's structure — they aren't part of the source repository.

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 116,000+ 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/}
}

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