test-driven-development

A test-first development method known as TDD, or test-driven development. You write a failing test, add the code needed to pass it, and then improve the code without changing its behaviour.

In plain words
What is it for?
It is for implementing features and fixing bugs when the project follows a strict test-first workflow.
Why use it?
It makes each feature or bug fix start with a clear check, reducing the chance of adding untested production code.

Skill for Claude CodeCodex

Part of the dev-workflow plugin — 16 skills, 1 command, 8 agents, 1 hook shipped together

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/xbklairith/kisune/test-driven-development
Any agent
npx skills add xbklairith/kisune --skill test-driven-development
Clone the repo
git clone --depth 1 https://github.com/xbklairith/kisune

Made for: Claude Code, Codex.

Or install dev-workflow, the plugin that ships this one along with the rest of its 16 skills, 1 command, 8 agents, 1 hook.

Per session 34 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,451 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin unknown No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00034 $0.02451
Opus 5 $0.00017 $0.01226
Sonnet 5 $0.00007 $0.00490
Haiku 4.5 $0.00003 $0.00245

Measured 2d ago against content hash ed8ac5c1f619, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

test-driven-development scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

dev-workflow/skills/test-driven-development/SKILL.md · 378 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 2d ago First seen · 378 lines · 34 tokens per session scan A ed8ac5c1f619

Subscribe to this mod's changes

test-driven-development is a skill published in the GitHub repository xbklairith/kisune (3 stars, last pushed 3mo ago), with no licence file. It adds 34 tokens to every session and 2,451 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

Related

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