atdd-assistant

atdd-assistant is a skill for Claude Code, Codex from ValorVie/custom-skills. It costs 68 tokens per session (2,624 once invoked), scanned A, original, MIT.

A guide to Acceptance Test-Driven Development, or ATDD, a process where a team agrees on user-story requirements and acceptance tests before coding. Acceptance tests check whether a feature meets the agreed business requirements.

In plain words
What is it for?
Use it for specification workshops, acceptance criteria, Given-When-Then examples, executable acceptance tests, and collaboration between product, development, and QA teams.
Why use it?
It reduces misunderstandings between product owners, developers, and testers by turning requirements into clear, testable examples.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one. Also seen: mentions Claude Code.

Needs its repository: it reads a path above its own folder, which exists only inside the repository. The line is **Language**: English | [繁體中文](../../../locales/zh-TW/skills/claude-code/atdd-assistant/SKILL.md).

Good fit Use it for specification workshops, acceptance criteria, Given-When-Then examples, executable acceptance tests, and collaboration between product, development, and QA teams.

Compare 6 skills from other repositories ↓
Install

Getting it into your agent

It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.

Clone the repo
git clone --depth 1 https://github.com/ValorVie/custom-skills
agentmods
npx agentmods add skills/valorvie/custom-skills/atdd-assistant

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-assistant

README.md
[![agentmods](https://agentmods.dev/badge/skills/valorvie/custom-skills/atdd-assistant/github.svg)](https://agentmods.dev/skills/valorvie/custom-skills/atdd-assistant)
Your own site
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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-assistant

Your own site · 80×15
<a href="https://agentmods.dev/skills/valorvie/custom-skills/atdd-assistant"><img src="https://agentmods.dev/badge/skills/valorvie/custom-skills/atdd-assistant.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 68 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,624 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 original 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 $0.00068 $0.02624
Opus 5 $0.00034 $0.01312
Sonnet 5 $0.00014 $0.00525
Haiku 4.5 $0.00007 $0.00262

Measured 7d ago against content hash e0b15689b2d2, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

atdd-assistant 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 7d 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.

upstream/uds/backup/skills/atdd-assistant/SKILL.md · 380 lines

How it starts

The opening of the file, as written. The whole thing — 380 lines — stays where its author put it; the contents beside it link to each section on GitHub.

ATDD Assistant

Language: English | 繁體中文

Version: 1.0.0 Last Updated: 2026-01-19 Applicability: Claude Code Skills


Purpose

This skill guides teams through the Acceptance Test-Driven Development workflow, helping them:

  • Conduct effective Specification Workshops
  • Write testable acceptance criteria in Given-When-Then format
  • Convert criteria to executable acceptance tests
  • Ensure proper collaboration between PO, Dev, and QA
  • Integrate ATDD with BDD and TDD for complete workflow

Quick Reference

ATDD Workflow Checklist

┌─────────────────────────────────────────────────────────────────┐
│  🤝 SPECIFICATION WORKSHOP Phase                                 │
│  □ Product Owner presents user story                            │
│  □ Team asks clarifying questions                               │
│  □ Acceptance criteria defined together                         │
│  □ Concrete examples written for each AC                        │
│  □ Edge cases and error scenarios discussed                     │
│  □ Out of scope explicitly documented                           │
├─────────────────────────────────────────────────────────────────┤
│  🧪 DISTILLATION Phase                                           │
│  □ Examples converted to executable tests                       │
│  □ Ambiguity removed from tests                                 │
│  □ Tests in executable format (Gherkin, FitNesse, etc.)         │
│  □ Product Owner signs off on tests                             │
├─────────────────────────────────────────────────────────────────┤
│  💻 DEVELOPMENT Phase                                            │
│  □ Acceptance tests initially fail (RED)                        │
│  □ BDD used for feature tests, TDD for unit tests               │
│  □ Incremental progress toward passing ATs                      │
│  □ All acceptance tests pass (GREEN)                            │
│  □ Code refactored and clean                                    │
├─────────────────────────────────────────────────────────────────┤
│  🎬 DEMO Phase                                                   │
│  □ All acceptance tests passing                                 │
│  □ Demo environment prepared                                    │
│  □ Key stakeholders present                                     │
│  □ Product Owner validates functionality                        │
│  □ Story accepted or criteria refined                           │
└─────────────────────────────────────────────────────────────────┘

Read the full file on GitHub · 380 lines

Files

What ships with it

2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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. 7d ago First seen · 380 lines · 68 tokens per session scan A e0b15689b2d2

Subscribe to this mod's changes

atdd-assistant is a skill published in the GitHub repository ValorVie/custom-skills (5 stars, last pushed 2d ago), licensed MIT. It adds 68 tokens to every session and 2,624 once invoked, about $0.0003 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.