atdd

atdd is a skill for Claude Code, Codex from bish-x/bx-dev-skill. It costs 92 tokens per session (8,821 once invoked), scanned A, original, no licence file.

A reference for acceptance test-driven development and test-driven development, ways of writing tests before or alongside implementation.

In plain words
What is it for?
Use it to derive tests from acceptance criteria, combine user-facing and unit tests, choose tests based on dependencies, and check test strength with mutation testing.
Why use it?
It helps turn requirements into executable checks and guides development through failing tests, working code, and cleanup.

Skill for Claude CodeCodex

Which agent this was written for is unclear — body not stored (licence); the path alone says nothing.

Good fit Use it to derive tests from acceptance criteria, combine user-facing and unit tests, choose tests based on dependencies, and check test strength with mutation testing.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/bish-x/bx-dev-skill/atdd
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.

Any agent
npx skills add bish-x/bx-dev-skill --skill atdd
Clone the repo
git clone --depth 1 https://github.com/bish-x/bx-dev-skill

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for atdd

README.md
[![agentmods](https://agentmods.dev/badge/skills/bish-x/bx-dev-skill/atdd/github.svg)](https://agentmods.dev/skills/bish-x/bx-dev-skill/atdd)
Your own site
<a href="https://agentmods.dev/skills/bish-x/bx-dev-skill/atdd"><img src="https://agentmods.dev/badge/skills/bish-x/bx-dev-skill/atdd/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for atdd

Your own site · 80×15
<a href="https://agentmods.dev/skills/bish-x/bx-dev-skill/atdd"><img src="https://agentmods.dev/badge/skills/bish-x/bx-dev-skill/atdd.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 92 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 8,821 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
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 5.1 $0.00092 $0.08821
Opus 5 $0.00046 $0.04411
Sonnet 5 $0.00018 $0.01764
Haiku 4.5 $0.00009 $0.00882

Measured 6d ago against content hash b08fc26c271b, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

atdd 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 6d 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.

skills/bx-dev/skill-library/review-qa/atdd/SKILL.md · 956 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. 6d ago First seen · 956 lines · 92 tokens per session scan A b08fc26c271b

Subscribe to this mod's changes

atdd is a skill published in the GitHub repository bish-x/bx-dev-skill (23 stars, last pushed 3mo ago), with no licence file. It adds 92 tokens to every session and 8,821 once invoked, about $0.0005 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 2026-09-03.

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