drill-tdd SKILL.md skillA
drill-tdd from kucherenko/gangsta is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add kucherenko/gangsta/drill-tdd@git:20260413.b31988ePins git:20260413.b31988e in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- kucherenko/gangsta
- Path
skills/drill-tdd/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260413.b31988e, committed Apr 13, 2026
- Size
- 8,542 bytes
- Repository stars
- 86
- License
- MIT
Use when implementing any feature or bugfix — enforces the Red-Green-Refactor drill with no production code allowed without a failing test first.
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
# The Drill: Test-Driven Development
## Overview
Write the test first. Watch it fail. Write minimal code to pass.
**Core principle:** If you didn't watch the test fail, you don't know if it tests the right thing.
**Violating the letter of the rules is violating the spirit of the rules.**
## When to Use
**Always:**
- New features
- Bug fixes
- Refactoring
- Behavior changes
**Exceptions (ask the Don):**
- Throwaway prototypes
- Generated code
- Configuration files
Thinking "skip the Drill just this once"? Stop. That's rationalization.
## The Iron Law (The Omerta of Testing)
```
NO PRODUCTION CODE WITHOUT A FAILING TEST FIRST
```
Write code before the test? Delete it. Start over.
**No exceptions:**
- Don't keep it as "reference"
- Don't "adapt" it while writing tests
- Don't look at it
- Delete means delete
Implement fresh from tests. Period.
## Red-Green-Refactor
```dot
digraph tdd_cycle {
rankdir=LR;
red [label="RED\nWrite failing test", shape=box, style=filled, fillcolor="#ffcccc"];
verify_red [label="Verify fails\ncorrectly", shape=diamond];
green [label="GREEN\nMinimal code", shape=box, style=filled, fillcolor="#ccffcc"];
…Read the whole file at its exact version.
How to install
mdr add kucherenko/gangsta/drill-tdd@sha256:0c9487893a8623faThe line at the top of this page pins the label git:20260413.b31988e, 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_e2fnpz6z5sicyyec)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Apr 13, 2026.
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 (8542 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
kucherenko/gangsta · 86 stars · license MIT · pushed 2026-10-27 · branch master
API
GET https://markdownregistry.com/api/v1/artifacts/art_e2fnpz6z5sicyyec GET https://markdownregistry.com/api/v1/resolve?ref=kucherenko/gangsta/drill-tdd GET https://markdownregistry.com/api/v1/blob/0c9487893a8623fadb94ff996b02e8d7840924da2a45d9031277c8e3acaf4ad4
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.