tdd SKILL.md skillA
tdd from testdouble/han is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add testdouble/han/tdd@git:20260915.ec2cb7cPins git:20260915.ec2cb7c in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- testdouble/han
- Path
han-coding/skills/tdd/SKILL.md- Versions recorded
- 6
- Latest version
- git:20260915.ec2cb7c, committed Sep 15, 2026
- First version recorded
- Aug 14, 2026
- Size
- 22,530 bytes
- Repository stars
- 338
- License
- MIT
Write code through a disciplined, BDD-framed Test-Driven Development loop: build a behavior test list, then drive each behavior through red-green-refactor with an enforced observed-failure gate. Use when the user wants to implement, build, or write code test-first, "do TDD", follow "red-green-refactor", drive code from tests, choose the next test by the Transformation Priority Premise (TPP) or ZOMBIES ordering, or grow a feature behavior-by-behavior with tests leading. This skill writes and…
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
## Project Context
- git installed: !`which git 2>/dev/null || echo "not installed"`
- current branch: !`git branch --show-current 2>/dev/null || echo unknown`
- CLAUDE.md: !`find . -maxdepth 1 -name "CLAUDE.md" -type f`
- project-discovery.md: !`find . -maxdepth 3 -name "project-discovery.md" -type f`
- personal config directory: !`bash "${CLAUDE_PLUGIN_ROOT}/scripts/han-config-dir.sh" 2>/dev/null || echo "$HOME/.claude"`
- project .han/config.md: !`cat .han/config.md 2>/dev/null || echo ""`
As your first action, use the Read tool on `.han/config.md` inside the `personal config directory` path above. A read
that returns no file is no personal configuration: continue silently. When that file or the `project .han/config.md`
probe supplies content, apply it per [config-rule.md](../../references/config-rule.md), which governs precedence
between the two files, relative-path resolution, and what to do with a file that reads but cannot be used.
## Constraints (read before anything else)
This skill writes production and test code in your working tree. It is an execution skill, not a document generator.
These constraints shape every step and override any instinct to move faster.
…Read the whole file at its exact version.
How to install
mdr add testdouble/han/tdd@sha256:884cfbfed3bf37b6The line at the top of this page pins the label git:20260915.ec2cb7c, 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_u42ys4cyxeunped7)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 6 versions of this file, between Aug 14, 2026 and Sep 15, 2026, about one every 6 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260915.ec2cb7c latest | 2026-09-15 | ec2cb7c | 22,530 B | A | view · diff |
| git:20260820.2ab8254 | 2026-08-20 | 2ab8254 | 22,475 B | A | view · diff |
| git:20260819.52abdf4 | 2026-08-19 | 52abdf4 | 18,128 B | A | view · diff |
| git:20260818.55bdb1d | 2026-08-18 | 55bdb1d | 17,619 B | A | view · diff |
| git:20260814.8b0aad6 | 2026-08-14 | 8b0aad6 | 18,016 B | A | view · diff |
| git:20260814.2ac091e | 2026-08-14 | 2ac091e | 17,615 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 (22530 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
testdouble/han · 338 stars · license MIT · pushed 2026-11-01 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_u42ys4cyxeunped7 GET https://markdownregistry.com/api/v1/resolve?ref=testdouble/han/tdd GET https://markdownregistry.com/api/v1/blob/884cfbfed3bf37b66dcb435ef3e0b7c264948723a43c6c52d5ea8bb8069e655a
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.