codexplugin
T

Tdd

by mxyhi

Skillcoding422 stars

Test-driven development with red-green-refactor vertical slices through public interfaces

1. Install now

$ npx codex-marketplace add mxyhi/ok-skills/tdd --skill

2. Verify after restart

“Add checkout validation using TDD — one failing test at a time, public API only”

More verify prompts

Get it working

Install → restart → verify. Stay on this page until Tdd responds.

  1. 01

    Copy the install command

    Use the command on this page — it includes the correct --skill flag for this skill.

  2. 02

    Run it in your project terminal

    Execute the command from the directory where you use Codex, not necessarily your home folder.

  3. 03

    Restart or reload Codex

    Restart the Codex CLI or reload your IDE window so the new extension is picked up.

  4. 04

    Verify with a prompt

    Try one of the verify prompts below to confirm Tdd is active.

Verify it works

After install and reload, paste one of these into Codex.

Prompt 1

> Add checkout validation using TDD — one failing test at a time, public API only

Prompt 2

> Refactor this module with red-green-refactor and keep tests behavior-focused

Prompt 3

> Write the first tracer-bullet test for the new export endpoint before implementation

If install fails

Fix these common issues before digging into GitHub issues.

  • Command not found or install fails

    Use Node.js 18+ and confirm npx works. Corporate proxies may need HTTPS_PROXY set for GitHub and npm.

  • Installed but Codex ignores it

    Restart the Codex CLI or reload the IDE window. Confirm you used the correct --plugin / --skill / --hook flag.

  • Skill never seems to load

    Ask Codex to use the skill by name in your prompt, or check that the skill appears in your local Codex skills list after install.

Full install & troubleshooting guide

About

Test-driven development with red-green-refactor vertical slices through public interfaces

Tdd is a codex skill — a focused instruction set the agent loads when you need specialized coding help. Skills are lighter than full plugins and install with the --skill flag.

Source package path: mxyhi/ok-skills/tdd on GitHub (mxyhi/ok-skills).

Key features

  • Specialized agent instructions for coding tasks
  • Lighter than a full plugin — focused playbook the agent loads on demand
  • Install with the --skill flag via npx
  • Ideal when you want Tdd expertise without a full integration

Requirements

  • Node.js 18 or newer with npx available
  • Codex CLI or IDE extension installed and signed in
Back to all skills

More from mxyhi

Other skills by the same author

Related skills

More in coding