A command for writing and tracking BDD scenarios using Given, When, and Then steps. BDD, or behaviour-driven development, describes expected user behaviour in examples that can be checked during implementation.

Use it to create, list, inspect, update, and connect scenarios to features. It is suited to describing concrete flows such as a customer adding a product to a shopping cart.

It turns a feature idea into specific, testable situations and shows whether each situation is still a draft, being implemented, passing, or skipped. It can link scenarios to development tests and other planning records.

bdd — Command for Claude Code by studioKjm/ai-harness-template

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.

Clone the repo

git clone --depth 1 https://github.com/studioKjm/ai-harness-template

Made for: Claude Code.

Or install harness, the plugin that ships this one along with the rest of its 2 skills, 44 commands, 12 agents.

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.

README.md

[![agentmods](https://agentmods.dev/badge/commands/studiokjm/ai-harness-template/bdd/github.svg)](https://agentmods.dev/commands/studiokjm/ai-harness-template/bdd)

Your own site

<a href="https://agentmods.dev/commands/studiokjm/ai-harness-template/bdd"><img src="https://agentmods.dev/badge/commands/studiokjm/ai-harness-template/bdd/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.

Your own site · 80×15

<a href="https://agentmods.dev/commands/studiokjm/ai-harness-template/bdd"><img src="https://agentmods.dev/badge/commands/studiokjm/ai-harness-template/bdd.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 0 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 650 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.

Model	Per session	Once invoked
Fable 5.1	$0.00000	$0.00650
Opus 5.5	$0.00000	$0.00260
Sonnet 5.5	$0.00000	$0.00130
Haiku 4.5	$0.00000	$0.00065

Measured 2mo ago against content hash 8cc65fa07643, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

bdd 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 2mo 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.

methodologies/bdd/commands/bdd.md · 78 lines

What it actually says

/bdd — BDD Scenario Command

Given/When/Then 시나리오를 작성하고 구현 상태를 추적합니다.

Usage

/bdd new <title> [--feature|-f <FTR-ID>]
/bdd list [--state|-s <state>] [--feature|-f <FTR-ID>]
/bdd show <SCN-ID>
/bdd status <SCN-ID> <state>
/bdd link <SCN-ID> [--tdd <TDD-ID>] [--story <story-id>] [--rfc <RFC-ID>]

States

draft → ready → implementing → passing
                             ↘ skipped

State	의미
`draft`	시나리오 작성 중
`ready`	Given/When/Then 완성, 구현 준비
`implementing`	TDD 사이클과 연결, 구현 중
`passing`	테스트 통과 확인
`skipped`	범위 외 또는 향후 구현 예정

Workflow

1. /bdd new "고객이 상품을 장바구니에 추가할 수 있다"
2. # .harness/bdd/scenarios/SCN-20260501-001-고객이-상품을.yaml 편집
3. /bdd status SCN-001 ready
4. /bdd link SCN-001 --tdd TDD-20260501-001   # TDD 사이클 연결
5. /bdd status SCN-001 implementing
6. # 구현 완료 후
7. /bdd status SCN-001 passing

BDD 3 Amigos

시나리오 작성 전 세 가지 관점 확인:

Product (기획): "어떤 문제를 해결하나?"
Dev (개발): "어떻게 구현하나?"
QA (테스트): "어떻게 검증하나?"

Given/When/Then 작성 규칙

# ✅ 좋은 예 — 구체적이고 단일 행동
given:
  - "고객 계정이 존재한다"
  - "장바구니가 비어있다"
when:
  - "고객이 상품 ID 'PROD-001'을 장바구니에 추가한다"
then:
  - "장바구니에 상품이 1개 있다"
  - "장바구니 총액이 10,000원이다"

# ❌ 나쁜 예 — 너무 광범위
given:
  - "시스템이 준비되어 있다"
when:
  - "사용자가 모든 것을 한다"
then:
  - "잘 된다"

Composition

/methodology compose bdd tdd-strict    # 시나리오 → TDD 사이클로 세분화
/methodology compose bdd ddd-lite      # Feature = Bounded Context 단위
/methodology compose bdd living-spec   # 시나리오가 살아있는 명세의 일부

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.

2mo ago First seen · 78 lines · 0 tokens per session scan A 8cc65fa07643

Subscribe to this mod's changes

bdd is a command published in the GitHub repository studioKjm/ai-harness-template (46 stars, last pushed 22d ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 650 tokens. 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 2026-08-30.

Claude Code Guardrails Planning Testing ai-agent ai-harness developer-tools harness-engineering

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