engineering-craft SKILL.md skillA
engineering-craft from mickeyyaya/evolve-loop is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add mickeyyaya/evolve-loop/engineering-craft@git:20260927.dbf7e47Pins git:20260927.dbf7e47 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- mickeyyaya/evolve-loop
- Path
skills/engineering-craft/SKILL.md- Versions recorded
- 4
- Latest version
- git:20260927.dbf7e47, committed Sep 27, 2026
- First version recorded
- Jul 7, 2026
- Size
- 6,247 bytes
- Repository stars
- 6
- License
- Apache-2.0
Use when writing or changing any production code or tests — new features, bug fixes, refactors, or test authoring, in any language, by any model on any CLI.
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
# Engineering Craft — how code gets written here > The craft companion to `fable` (which governs how you *operate*; this governs the code you *produce*). Content is distilled from 2025-26 measured evidence — mutation-testing studies, million-commit analyses of AI-written code, and benchmarked skill collections — not textbook restatement. Sources: [knowledge-base/research/coding-craft-2026/](../../knowledge-base/research/coding-craft-2026/). ## Iron Laws (RIGID — no exceptions, no negotiation) 1. **No production code without a failing test first.** Watch it fail, for the RIGHT reason (assertion failure on the missing behavior — not a compile error, not a typo). If code came first anyway: delete it, write the test, start over. Yes, really. 2. **Completion = machine evidence.** Every task ends with a runnable check (test run, build, diff) whose real output you show. "Should work" is not a state of code. 3. **Search before you write.** Before adding any function/type/helper: search for the existing one. Duplication is the measured #1 AI-code pathology (+81% duplicated blocks since 2023). Extending beats re-creating; consolidating beats both. …
Read the whole file at its exact version.
How to install
mdr add mickeyyaya/evolve-loop/engineering-craft@sha256:f77262dbf50d54d3The line at the top of this page pins the label git:20260927.dbf7e47, 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.
[](https://markdownregistry.com/a/art_rbe2ygs4q7otobkc)
6 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 4 versions of this file, between Jul 7, 2026 and Sep 27, 2026, about one every 27 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260927.dbf7e47 latest | 2026-09-27 | dbf7e47 | 6,247 B | A | view · diff |
| git:20260802.5aec685 | 2026-08-02 | 5aec685 | 6,146 B | A | view · diff |
| git:20260707.be25d5b | 2026-07-07 | be25d5b | 6,078 B | A | view · diff |
| git:20260707.a373c5b | 2026-07-07 | a373c5b | 6,088 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (6247 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
mickeyyaya/evolve-loop · 6 stars · license Apache-2.0 · pushed 2026-11-07 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_rbe2ygs4q7otobkc GET https://markdownregistry.com/api/v1/resolve?ref=mickeyyaya/evolve-loop/engineering-craft GET https://markdownregistry.com/api/v1/blob/f77262dbf50d54d3087d5634e3bf9231c489f0e09ae9e0ec0f9561b3fc6c422b
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.