JuliusBrussee
Install Lean Build
Pick your agent. Every command is ready to paste.
npx skills add JuliusBrussee/caveman --skill lean-buildThe open skills CLI detects your agents (Claude Code, Cursor, Codex and 70+ more) and installs to the right folder. Add -g to install globally.
01
Install it
Run the command above, or upload the folder in Claude.
02
Ask naturally
Describe the task. Your agent loads lean-build when the request matches its description.
03
Name it if needed
If it does not trigger, say “use the lean-build skill”. In Codex, type $lean-build.
The skill itself
SKILL.md
Lean build
Native Core's architecture-first simplicity remains mandatory. Turn feature into complete narrow outcome fitting system.
- Derive observable acceptance and explicit non-goals from request and repository.
- Trace entry point through layers owning invariants.
- Deliver coherent end-to-end path across responsible layers; never force work into one file, direct expression, or local patch.
- Reuse fitting seam. Refactor when patching duplicates behavior, weakens ownership, or hides root cause.
- Omit modes, providers, config, extensibility, and polish unless acceptance needs them.
- Add surface, dependency, service, config, or migration only for lifecycle design or acceptance; state material tradeoff.
- Keep work runnable; preserve Core safety.
Exercise path. Run focused proof. Stop when acceptance passes. Report only material omissions and trigger.
Tips for Lean Build
- • Start a fresh session after installing so your agent picks up the new skill.
- • It is part of a pack with 22 skills. Install only the ones you need with --skill to keep triggers precise.
- • If two skills overlap, mention the one you want by name.
Questions about Lean Build
What does the Lean Build skill do?
Build feature work with high overbuilding risk. Use for new behavior, product slices, or integrations where repository reuse, strict scope, and an explicit stop condition matter.
How do I install Lean Build?
Run "npx skills add JuliusBrussee/caveman --skill lean-build" in your project. The skills CLI installs it for Claude Code, Cursor, Codex and 70+ other agents. In Claude on the web, upload the skill folder as a ZIP under Customize > Skills.
Does Lean Build work in Cursor and Codex?
Yes. Lean Build uses the open SKILL.md format, so it works in Claude Code, Claude, Cursor, OpenAI Codex, Gemini CLI, GitHub Copilot and other agents that support agent skills.
Is Lean Build free?
Lean Build is open source on GitHub under the Apache-2.0 license. It is free to install; check the license before commercial use.
Who made Lean Build?
Lean Build is published by JuliusBrussee in the JuliusBrussee/caveman repository, together with 21 other skills.
