tdd SKILL.md skillA
tdd from jkitchin/knowhow is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add jkitchin/knowhow/tdd@git:20260307.3e74b2fPins git:20260307.3e74b2f in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- jkitchin/knowhow
- Path
skills/development/tdd/SKILL.md- Versions recorded
- 2
- Latest version
- git:20260307.3e74b2f, committed Mar 7, 2026
- First version recorded
- Nov 6, 2025
- Size
- 12,795 bytes
- Repository stars
- 42
- License
- MIT
Test-Driven Development facilitation using the red-green-refactor cycle. Guides users through writing tests first, implementing minimal code to pass, and refactoring for quality. Use when users want to practice TDD, need help writing tests before code, are developing new features test-first, or want guidance on test structure and implementation. Triggers include 'use TDD,' 'test-driven development,' 'write tests first,' 'red-green-refactor,' or requests to develop functionality with tests.
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
# Test-Driven Development (TDD) Skill Guide users through disciplined test-first development using the red-green-refactor cycle. ## Core TDD Workflow **RED → GREEN → REFACTOR → REPEAT** ### RED: Write a Failing Test 1. Identify next small behavior to implement 2. Write test that specifies that behavior 3. Run test to verify it **fails for the right reason** 4. If test passes unexpectedly, test is wrong ### GREEN: Make It Pass 1. Write **minimal** code to make test pass 2. Don't worry about perfection yet 3. Simplest solution that works 4. Run test to verify it passes ### REFACTOR: Improve the Code 1. Improve code quality while keeping tests green 2. Remove duplication 3. Improve names and structure 4. Run tests after each change to ensure still passing ### REPEAT 1. Commit when tests are green 2. Identify next behavior 3. Start cycle again with new test ## TDD Discipline **Critical rules to follow:** ### Test First (RED Phase) - **Always write test before implementation** - Resist urge to write code first - Test defines what "done" means - See test fail before making it pass ### Minimal Implementation (GREEN Phase) - **Write simplest code to pass** - Don't over-engineer …
Read the whole file at its exact version.
How to install
mdr add jkitchin/knowhow/tdd@sha256:cf09b3deb93916d7The line at the top of this page pins the label git:20260307.3e74b2f, 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_yt3252wmgjnvz4qs)
1 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 2 versions of this file, between Nov 6, 2025 and Mar 7, 2026, about one every 121 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260307.3e74b2f latest | 2026-03-07 | 3e74b2f | 12,795 B | A | view · diff |
| git:20251106.c9f1f5d | 2025-11-06 | c9f1f5d | 12,793 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 (12795 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
jkitchin/knowhow · 42 stars · license MIT · pushed 2026-11-02 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_yt3252wmgjnvz4qs GET https://markdownregistry.com/api/v1/resolve?ref=jkitchin/knowhow/tdd GET https://markdownregistry.com/api/v1/blob/cf09b3deb93916d74e412d3bced36fc67514ecb6299650c6865be38be3851375
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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