developing-features-tdd SKILL.md skillA
developing-features-tdd from cristhianzl/claude-skills-czl is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add cristhianzl/claude-skills-czl/developing-features-tdd@git:20260813.0b7d6d3Pins git:20260813.0b7d6d3 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- cristhianzl/claude-skills-czl
- Path
configs/agnostic/skills/developing-features-tdd/SKILL.md- Versions recorded
- 3
- Latest version
- git:20260813.0b7d6d3, committed Aug 13, 2026
- First version recorded
- Jun 19, 2026
- Size
- 17,618 bytes
- Repository stars
- 5
- License
- MIT
Build a new feature using strict test-driven development — UNDERSTAND → DESIGN → RED → VERIFY RED → GREEN → VERIFY GREEN → REFACTOR → VALIDATE → REPEAT. Use when building a new feature with TDD, when the user says "TDD this", "tests first", "red green refactor", or asks for feature work that needs to be verifiable from the spec. For bug fixes use fixing-bugs; for non-TDD production code use developing-features.
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
# Developing Features with TDD Test-driven feature development. Every observable behavior is driven by a failing test that goes RED → GREEN, with architecture planned before the first test is written. > **Never write production code for a new feature before proving its expected behavior with a failing test.** ## Read first (always) List `learnings/` and read every file relevant to the current feature. Project-specific test conventions, framework quirks, or constraints live there and override the defaults in this SKILL.md. If a learning conflicts with this file, **the learning wins** — mention it to the user. ## Tradeoff — when to apply, when to lighten up Apply the full nine-phase cycle for **production features** the user explicitly asks to build with TDD, or for code paths where regressions are expensive (payments, auth, data integrity, AI runtime, public APIs). Lighten the formality for one-off scripts, throwaway exploration, prototypes the user has labeled as such, or features under 30 lines of production code. Still write at least one happy-path test and one adversarial test — but skip the explicit Phase 2 design document. …
Read the whole file at its exact version.
How to install
mdr add cristhianzl/claude-skills-czl/developing-features-tdd@sha256:019a1a204cf7ff74The line at the top of this page pins the label git:20260813.0b7d6d3, 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_nm52ap3363mcopkt)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 3 versions of this file, between Jun 19, 2026 and Aug 13, 2026, about one every 27 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260813.0b7d6d3 latest | 2026-08-13 | 0b7d6d3 | 17,618 B | A | view · diff |
| git:20260623.1e7c345 | 2026-06-23 | 1e7c345 | 17,515 B | A | view · diff |
| git:20260619.c43368b | 2026-06-19 | c43368b | 16,079 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 (17618 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
cristhianzl/claude-skills-czl · 5 stars · license MIT · pushed 2026-09-24 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_nm52ap3363mcopkt GET https://markdownregistry.com/api/v1/resolve?ref=cristhianzl/claude-skills-czl/developing-features-tdd GET https://markdownregistry.com/api/v1/blob/019a1a204cf7ff74e873ffb7b5fe4294bcb0902a03248772fc34134bcd2608fa
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.
More from cristhianzl/claude-skills-czl
Every file in cristhianzl/claude-skills-czl