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tdd SKILL.md skillA

tdd from int2t05/engineering-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.

Install it, pinned

mdr add int2t05/engineering-skills/tdd@git:20261015.f440cbb

Pins git:20261015.f440cbb in mdr.lock. Pin the fingerprint instead.

Audit grade: A, 17 of 17 checks passed
Kind: SKILL.md skill
Repository: int2t05/engineering-skills
Path: skills/06-test/tdd/SKILL.md
Versions recorded: 5
Latest version: git:20261015.f440cbb, committed Oct 15, 2026
First version recorded: Aug 10, 2026
Size: 1,569 bytes
Repository stars: 3
License: MIT

Implement behavior through a focused red-green-refactor loop. Triggers on "tdd", "测试驱动开发".

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

## When to use

- Implement behavior through a focused red-green-refactor loop.

**Not for:** implement for planned delivery; test-generation for existing behavior.

## Steps

1. Find real commands, layout and public seam; use real code and controlled data, disclosing external substitutes.

2. Write one behavior test, run it and confirm failure from missing or incorrect behavior rather than harness errors.

3. Implement minimally, run the focused test and relevant regressions, and refactor while green.

4. Repeat for the next behavior and finish relevant verification; report observed red/green evidence and commit only on request.

## Verify

- A meaningful failure preceded the passing fix; assertions use independent expected behavior and checks are not disabled.

## References

- [engineering-principles.md](../../../references/engineering-principles.md) — shared decision boundaries, scope and verification.
- [references/test-strategy.md](references/test-strategy.md) — test pyramid, test-double hierarchy (Real > Fake > Stub > Mock), DAMP over DRY
…

Read the whole file at its exact version.

How to install

The exact contents, by fingerprint

mdr add int2t05/engineering-skills/tdd@sha256:570a159174206911

The line at the top of this page pins the label git:20261015.f440cbb, 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.

Badge

[![mdr](https://markdownregistry.com/badge/art_3buxv5ja2muclzvb.svg)](https://markdownregistry.com/a/art_3buxv5ja2muclzvb)

1 badge image fetches in 30 days. What the badge shows.

Versions

The registry has recorded 5 versions of this file, between Aug 10, 2026 and Oct 15, 2026, about one every 16 days.

version	committed	commit	size	audit
git:20261015.f440cbb latest	2026-10-15	f440cbb	1,569 B	A	view · diff
git:20260819.de6e0a1	2026-08-19	de6e0a1	5,043 B	A	view · diff
git:20260813.b3bc7df	2026-08-13	b3bc7df	5,015 B	A	view · diff
git:20260811.e063951	2026-08-11	e063951	4,747 B	A	view · diff
git:20260810.64234a5	2026-08-10	64234a5	4,515 B	A	view

Audit of the latest version

A 17 of 17 checks passed. Fixed automatic checks with no AI involved, so the same checks give the same answer every run.

pass: Frontmatter block present
pass: Frontmatter declares a name
pass: Frontmatter declares a description
pass: Size between 200 bytes and 200 KB (1569 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

GitHub

int2t05/engineering-skills · 3 stars · license MIT · pushed 2026-10-15 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_3buxv5ja2muclzvb
GET https://markdownregistry.com/api/v1/resolve?ref=int2t05/engineering-skills/tdd
GET https://markdownregistry.com/api/v1/blob/570a15917420691160b8538db37abf26bd2f282d2dccf1d1e1c654ad198bdb04

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.