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Lean Project Instructions

Category: Product  ·  Sub-category: product-misc  ·  Last updated:
Use whenever a user wants to set up AI coding assistant instructions for their project. Triggers: "add a CLAUDE.md", "set up Copilot instructions", "configure Cursor rules", "write Windsurf rules", "add AI instructions to my repo", "configure Claude for this codebase", or any mention of .cursorrules, copilot-instructions.md, .windsurfrules, or CLAUDE.md. Also trigger when creating or updating any project rules file for AI coding tools, even if the user doesn't name the file format. Generates lean, caveman-compressed instruction files for one or more platforms. Only durable, non-inferable rules get written down.
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From the source SKILL.md

Generate lean instruction files for AI coding assistants. One canonical rule set, written to whichever platform files the user needs. Caveman-compress everything before writing.

What this skill does

Lean Project Instructions 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-project-instructions/ and loads when your prompt matches the skill's trigger.

When to invoke it: Use whenever a user wants to set up AI coding assistant instructions for their project. Triggers: "add a CLAUDE.

Who uses this skill

The Lean Project Instructions 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 211,000+ 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-project-instructions
curl -L https://claudskills.com/skills/lean-project-instructions/SKILL.md \
  -o ~/.claude/skills/lean-project-instructions/SKILL.md

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

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

Telegram

📱 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 Project Instructions Claude Code skill?
Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/lean-project-instructions/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.
What does the Lean Project Instructions skill do?
Use whenever a user wants to set up AI coding assistant instructions for their project. Triggers: "add a CLAUDE.md", "set up Copilot instructions", "configure Cursor rules", "write Windsurf rules", "add AI instructions to my repo", "configure Claude for this codebase", or any mention of .cursorrules, copilot-instructions.md, .windsurfrules, or CLAUDE.md. Also trigger when creating or updating any project rules file for AI coding tools, even if the user doesn't name the file format. Generates lean, caveman-compressed instruction files for one or more platforms. Only durable, non-inferable rules get written down.
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 Project Instructions skill?
Use Lean Project Instructions 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 Project Instructions" 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 Project Instructions 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 Project Instructions 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

Cite this skill

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

APA
GalacticGhost. (2026). Lean Project Instructions [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/lean-project-instructions/
BibTeX
@misc{lean-project-instructions-2026,
  author    = {GalacticGhost},
  title     = {Lean Project Instructions [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/lean-project-instructions/}
}

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