---
title: "Lean build - Air Market"
description: "You have a new feature to build, and the worry is that it ends up bigger than you asked for. This skill is made for that kind of work. It keeps the job inside a strict scope, prefers using what your…"
canonical: "https://airmarket.ai/app/lean-build"
---

[Air Market](/) / [Developer Tools](/category/devtools) / Lean build

Skill by [Julius Brussee](/@juliusbrussee)

# Lean build

Build just the feature you planned, then actually stop

## What this does

You have a new feature to build, and the worry is that it ends up bigger than you asked for. This skill is made for that kind of work. It keeps the job inside a strict scope, prefers using what your repository already has, and gives the work a clearly defined stopping point. Reach for it when you are adding new behavior, cutting a product slice, or building an integration.

### Top 3 things it does for you

- Build a new behavior, product slice, or integration
- Keep the work inside a strict scope
- Reuse what the repository already has

## Information

**Lean build at a glance**

|  |  |
| --- | --- |
| Kind | Skill |
| Publisher | [Julius Brussee](/@juliusbrussee) |
| Category | [Developer Tools](/category/devtools) |
| Works with | Agent Skills - an open standard supported by 40+ agents |
| Size | 1 KB |
| Licence | _Not recorded_ |
| Repository | [juliusbrussee/caveman](https://github.com/juliusbrussee/caveman/tree/a0109974ea3258a14aadaef1ed1f8ff2837d30d5/skills/lean-build) |
| GitHub stars | 118,504 (as of Nov 2026) |

## Security report

**Verified.** AIR scanned this exact version of Lean build and flagged nothing. AIR's verdict: **safe**.

**What Lean build's check was run against**

|  |  |
| --- | --- |
| Commit | a0109974ea3258a14aadaef1ed1f8ff2837d30d5 |
| Content hash | 8af7bc422547529f71b4d2a7d036c2db1fdfc734d288b98f8b2c142f5f9a671f |
| Files read | [Browse the files at this exact commit](https://github.com/juliusbrussee/caveman/blob/a0109974ea3258a14aadaef1ed1f8ff2837d30d5/skills/lean-build/SKILL.md) |

A scan is named by the exact content it read, not by a version number. A different version is a different artifact, and nothing here applies to a version AIR has not scanned.

[Read the full security report for Lean build](/security/lean-build)

## About Lean build

Some feature work is likelier than the rest to end up bigger than intended. This skill is aimed at exactly that work: new behavior added to a codebase, a product slice, or an integration between existing pieces.

The emphasis falls on restraint. The work leans on what the repository already provides, the scope is held strictly, and the build has an explicit condition that marks its end.

## What's inside

- SKILL.md - instructions
- agents/openai.yaml - data

## Questions

### Is Lean build safe to install?

AIR scanned this exact version of Lean build and flagged nothing. AIR's verdict: safe. The verdict is named by the content that was read, at commit a0109974ea32, so it cannot drift onto a version nobody scanned. The full report is at https://airmarket.ai/security/lean-build.

### How do I install Lean build?

Open https://airmarket.ai/app/lean-build on Air Market and use the install action: Air Market hands Claude a prompt naming this exact skill, and Claude sets it up. Source, pinned to the exact commit this listing describes: https://github.com/juliusbrussee/caveman/tree/a0109974ea3258a14aadaef1ed1f8ff2837d30d5/skills/lean-build. Install from that link, not the branch.

## Related on Air Market

- [More Developer Tools listings](/category/devtools)
- [Everything by Julius Brussee](/@juliusbrussee)

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Canonical URL: <https://airmarket.ai/app/lean-build>