lean-build SKILL.md skillA

lean-build from juliusbrussee/caveman is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.

Install it, pinned

mdr add juliusbrussee/caveman/lean-build@git:20260811.82864c8

Pins git:20260811.82864c8 in mdr.lock. Pin the fingerprint instead.

Audit grade: A, 17 of 17 checks passed
Kind: SKILL.md skill
Repository: juliusbrussee/caveman
Path: skills/lean-build/SKILL.md
Versions recorded: 1
Latest version: git:20260811.82864c8, committed Aug 11, 2026
Size: 1,090 bytes
Repository stars: 118,366
License: Apache-2.0

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.

Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.

What the file says

# 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.

Read the whole file at its exact version.

How to install

The exact contents, by fingerprint

mdr add juliusbrussee/caveman/lean-build@sha256:4d498073c6312858

The line at the top of this page pins the label git:20260811.82864c8, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.

Badge

[![mdr](https://markdownregistry.com/badge/art_5xey3brs3zrxqbeh.svg)](https://markdownregistry.com/a/art_5xey3brs3zrxqbeh)

3 badge image fetches in 30 days. What the badge shows.

Versions

The registry has recorded 1 version of this file, committed on Aug 11, 2026.

version	committed	commit	size	audit
git:20260811.82864c8 latest	2026-08-11	82864c8	1,090 B	A	view

Audit of the latest version

A 17 of 17 checks passed. Fixed automatic checks with no AI involved, so the same checks give the same answer every run.

pass: Frontmatter block present
pass: Frontmatter declares a name
pass: Frontmatter declares a description
pass: Size between 200 bytes and 200 KB (1090 bytes)
pass: No zero-width or bidi control characters
pass: No instruction hidden inside an HTML comment
pass: No link to an exfiltration or paste host
pass: No credential-shaped string
pass: No instruction to send local credentials anywhere
pass: No text hidden with inline styles
pass: No prompt-injection phrasing
pass: No curl or wget piped into a shell
pass: No recursive delete of root, home or parent
pass: No instruction to read or print local credentials
pass: No base64 blob over 200 characters
pass: No link to a raw IP address
pass: No script tag

Source

GitHub

juliusbrussee/caveman · 118,366 stars · license Apache-2.0 · pushed 2026-11-08 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_5xey3brs3zrxqbeh
GET https://markdownregistry.com/api/v1/resolve?ref=juliusbrussee/caveman/lean-build
GET https://markdownregistry.com/api/v1/blob/4d498073c6312858b220e9a04b7456c2485c734edb077f6bb17d88a7ed96ad7a

Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.

Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.