tdd SKILL.md skillA

This file is byte-identical to the first copy the registry indexed. Same content hash, so the same checks give both the same grade.

tdd from fusengine/claude-plugins is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.

mdr add fusengine/claude-plugins/tdd@git:20260729.3b91eed

Pins git:20260729.3b91eed in mdr.lock. Pin the fingerprint instead.

Audit grade

A, 17 of 17 checks passed

Kind

SKILL.md skill

Repository

fusengine/claude-plugins

Path

plugins/ai-pilot/skills/tdd/SKILL.md

Versions recorded

3

Latest version

git:20260729.3b91eed, committed Jul 29, 2026

First version recorded

Feb 27, 2026

Size

3,036 bytes

Repository stars

34

License

MIT

Use when writing production code that needs tests -- new features, bug fixes, refactoring. Enforces RED-GREEN-REFACTOR before implementation.

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

<objective>
TDD enforces the Iron Law -- no production code without a failing test first -- through a strict RED-GREEN-REFACTOR loop: detect the stack and test framework, write one failing test for the next behavior, verify it fails for the *expected* reason (not a syntax error or missing fixture), write the simplest code that passes it, verify the full suite is green, refactor while staying green, then repeat for the next behavior.

It never skips a VERIFY step -- a test that passes on first run proves nothing and must be investigated, not accepted.
</objective>

# TDD Skill

Write the test first. Watch it fail. Write minimal code to pass.

## The Iron Law

**No production code without a failing test first.**

Every line of production code must be justified by a test that failed without it.
No exceptions. No shortcuts. No "I'll test after."

---

## Agent Workflow

```
1. DETECT  -> Identify stack, test framework, existing test patterns
2. RED     -> Write ONE failing test for the next behavior
3. VERIFY  -> Run test, confirm it fails for the EXPECTED reason
…

Read the whole file at its exact version.

How to install

mdr add fusengine/claude-plugins/tdd@sha256:9868b22627b62372

[![mdr](https://markdownregistry.com/badge/art_fvuqr3jzvkbblx3q.svg)](https://markdownregistry.com/a/art_fvuqr3jzvkbblx3q)

Versions

The registry has recorded 3 versions of this file, between Feb 27, 2026 and Jul 29, 2026, about one every 76 days.

Audit of the latest version

Source

API

GET https://markdownregistry.com/api/v1/artifacts/art_fvuqr3jzvkbblx3q
GET https://markdownregistry.com/api/v1/resolve?ref=fusengine/claude-plugins/tdd
GET https://markdownregistry.com/api/v1/blob/9868b22627b6237251a19dbe5b5f915a3668058b1f8f76056fc90275631b2e8c

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.

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