Home / hoangnguyen0403 / agent-skills-standard · .codex/skills/common/common-tdd/SKILL.md · GitHub

common-tdd skillA

Name: common-tdd
Author: hoangnguyen0403

This file is byte-identical to the first copy the registry indexed, one of 3 copies on public GitHub. Same content hash, same audit grade.

common-tdd is agent-read markdown (skill) from hoangnguyen0403/agent-skills-standard: Guides quality-first TDD for new behavior, bug fixes, and test changes. Selects the smallest test layer, proves a distinct regression risk, and runs bounded RED-GREEN-REFACTOR verification..

Indexed from public GitHub and served as immutable, content-addressed versions. Install it pinned to an exact SHA-256 with the mdr CLI, and every file is verified against the hash recorded here before it reaches your agent. The deterministic audit below grades the latest version, and the same file always earns the same grade.

What the file says

# Quality-First TDD

## **Priority: P0 (CRITICAL)**

A passing test is insufficient; the test must prove an owned behavior and a distinct plausible fault.

## Choose the mode

- **New behavior:** strict RED -> GREEN -> REFACTOR. Do not write production code before the expected RED.
- **Legacy or bug fix:** characterize only when needed, then reproduce the intended change as a failing regression (RED). Preserve unrelated existing code; do not delete it merely because it predates the test.

## Before writing a test

Create one Test Intent Record per behavior/risk:

- `contract`: observable contract — an application-owned result or side effect
- `fault`: distinct fault — a distinct plausible regression this test would catch
- `layer`: smallest honest unit, component, contract, integration, or E2E layer
- `cases`: minimal distinct equivalence classes; use a parameterized test for equivalent inputs
- `command`: exact focused single-run command

Reject tests that duplicate an existing fault, assert implementation detail or mock choreography, depend on time/network/order, or force a broader behavior into a unit.

## Bounded loop
…

Read the whole file at its exact version.

How to install

Latest version

mdr add hoangnguyen0403/agent-skills-standard/common-tdd@git:20260817.b5ee321

Exact content

mdr add hoangnguyen0403/agent-skills-standard/common-tdd@sha256:e46965cdbbd90046

Pin to a label to follow the author's releases, or to a sha256 to freeze the exact bytes forever. Either way the resolved hash is written to mdr.lock, and mdr install reproduces it on any machine.

Badge

[![mdr](https://markdownregistry.com/badge/art_r3m6z3otydqpejgl.svg)](https://markdownregistry.com/a/art_r3m6z3otydqpejgl)

1 badge views in 30 days

Versions

version	committed	commit	size	audit
git:20260817.b5ee321 latest	2026-08-17	b5ee321	3,649 B	A	view · diff
git:20260714.6bf9b5e	2026-07-14	6bf9b5e	3,454 B	A	view · diff
git:20260615.50729d2	2026-06-15	50729d2	3,333 B	A	view · diff
git:20260610.774e8d6	2026-06-10	774e8d6	2,793 B	A	view · diff
git:20260513.7eab4bf	2026-05-13	7eab4bf	2,643 B	A	view

Audit of the latest version

A 17 of 17 checks passed. Deterministic, no model, 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 (3649 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

hoangnguyen0403/agent-skills-standard · 571 stars · license MIT · pushed 2026-09-24 · branch develop

API

GET https://markdownregistry.com/api/v1/artifacts/art_r3m6z3otydqpejgl
GET https://markdownregistry.com/api/v1/resolve?ref=hoangnguyen0403/agent-skills-standard/common-tdd
GET https://markdownregistry.com/api/v1/blob/e46965cdbbd900462ad670d0723624fe4d111da9dfd1ba20b64f889f5955f36f

Your agent 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.

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