genai-io/san · .san/personas/software-engineer/skills/tdd/SKILL.md

tdd skillA

tdd is agent-read markdown (skill) from genai-io/san: Test-driven development — write a failing test that names the behavior, watch it fail, implement the minimum to make it pass, then refactor with tests green. Works for new features, bug fixes, and behavior changes. Use when the user says "tdd", "test-first", "write tests first", or wants a change built test-first..

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.

How to install

Latest version
mdr add genai-io/san/tdd@git:20260717.120e9bb
Exact content
mdr add genai-io/san/tdd@sha256:949f986e0619ce78

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 badge

[![mdr](https://markdownregistry.com/badge/art_whh2hi2f24aatkbo.svg)](https://markdownregistry.com/a/art_whh2hi2f24aatkbo)

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Versions

versioncommittedcommitsizeaudit
git:20260717.120e9bb latest2026-07-17 120e9bb 2,737 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 (2737 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

genai-io/san · 80 stars · license Apache-2.0 · pushed 2026-09-24 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_whh2hi2f24aatkbo
GET https://markdownregistry.com/api/v1/resolve?ref=genai-io/san/tdd
GET https://markdownregistry.com/api/v1/blob/949f986e0619ce787c582be44f7035754f75442b0ee94cd8920961ce9abbbd49

Your agent does the deals. You hear about the good ones. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.