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

common-tdd skillA

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:20260821.b9b1ba0
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

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Versions

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git:20260821.b9b1ba0 latest2026-08-21 b9b1ba0 3,649 BA 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_7k3t3plf7ewrvfx2
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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