A guide for writing BDD scenarios, which describe expected behavior as Given, When, and Then steps. It connects each scenario to a requirement and maps the steps to actions that can be executed.

Use it to create executable behavior scenarios from requirements and ensure every requirement has a corresponding testable example.

It turns formal requirements into concrete behavior examples that can be checked. The one-to-one mapping helps reveal missing coverage and duplicate or contradictory scenarios.

sdd-bdd — Skill for Claude Code and Codex by vladm3105

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 vladm3105/aidoc-flow-framework --skill sdd-bdd

Clone the repo

git clone --depth 1 https://github.com/vladm3105/aidoc-flow-framework

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/vladm3105/aidoc-flow-framework/sdd-bdd/github.svg)](https://agentmods.dev/skills/vladm3105/aidoc-flow-framework/sdd-bdd)

Your own site

<a href="https://agentmods.dev/skills/vladm3105/aidoc-flow-framework/sdd-bdd"><img src="https://agentmods.dev/badge/skills/vladm3105/aidoc-flow-framework/sdd-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/skills/vladm3105/aidoc-flow-framework/sdd-bdd"><img src="https://agentmods.dev/badge/skills/vladm3105/aidoc-flow-framework/sdd-bdd.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 32 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 279 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	$0.00032	$0.00279
Opus 5.5	$0.00013	$0.00112
Sonnet 5.5	$0.00006	$0.00056
Haiku 4.5	$0.00003	$0.00028

Measured 19d ago against content hash b15fdcade432, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

sdd-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 19d 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.

framework/skills/sdd-bdd/SKILL.md · 32 lines

What it actually says

SDD BDD Author

Framework skill — routes to framework/layers/04_BDD/BDD-TEMPLATE.yaml and BDD_WORKFLOW_STANDARD.md (entry gate GATE-03). Paths below use <skills-root> = this framework/skills/ directory. Upstream: sdd-ears statements are the input.

1. Scenarios, not scripts

Write standard linear Given/When/Then scenarios for atomic or monolithic features; reach for feature files only where the template's criteria call for them. Map each step to state-machine primitives (inject/operation/event/switch) so scenarios execute instead of merely reading well.

2. Cover the requirements, exactly

Every EARS statement gets at least one scenario; every scenario traces to exactly one EARS statement. A scenario covering nothing is theater; a requirement covered twice is a future contradiction — reconcile, don't duplicate.

3. Seal and hand off

Gate: GATE-03. Same fast-path restriction as EARS (CHG-L019). Next: sdd-adr.

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.

19d ago First seen · 32 lines · 32 tokens per session scan A b15fdcade432

Subscribe to this mod's changes

sdd-bdd is a skill published in the GitHub repository vladm3105/aidoc-flow-framework (17 stars, last pushed 5d ago), licensed MIT. It adds 32 tokens to every session and 279 once invoked, about $0.0001 per session on Opus 5.5. 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 2026-10-26.

E2E testing Testing

sdd-bdd next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
sdd-bddvladm3105/aidoc-flow-framework	Skill	17	5d ago	MIT	A	32	Claude Code, Codex
create-verification-skillYeachan-Heo/oh-my-claudecode	Skill	41k	today	MIT	A	45	Claude Code
verify-omnigentomnigent-ai/omnigent	Skill	11k	today	Apache-2.0	A	100	Claude Code, Codex
test-masterJeffallan/claude-skills	Skill	12k	3d ago	MIT	A	104	Claude Code
eval-dataset-designbojieli/ai-agent-book	Skill	58k	1mo ago	Apache-2.0	A	138	Claude Code, Codex
dogfoodcallstack/agent-device	Skill	5.4k	today	MIT	A	55	Claude Code
cua-driverdavidondrej/skills	Skill	4.3k	yesterday	MIT	A	68	Claude Code, Codex