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.
npx skills add cuongtl1992/vibe-skills --skill prd-to-gherkingit clone --depth 1 https://github.com/cuongtl1992/vibe-skillsWrote 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.
[](https://agentmods.dev/skills/cuongtl1992/vibe-skills/prd-to-gherkin)<a href="https://agentmods.dev/skills/cuongtl1992/vibe-skills/prd-to-gherkin"><img src="https://agentmods.dev/badge/skills/cuongtl1992/vibe-skills/prd-to-gherkin/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.
<a href="https://agentmods.dev/skills/cuongtl1992/vibe-skills/prd-to-gherkin"><img src="https://agentmods.dev/badge/skills/cuongtl1992/vibe-skills/prd-to-gherkin.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00152 | $0.03261 |
| Opus 5 | $0.00076 | $0.01631 |
| Sonnet 5 | $0.00030 | $0.00652 |
| Haiku 4.5 | $0.00015 | $0.00326 |
Grade A, and why
prd-to-gherkin 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 12d 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.
How it starts
The opening of the file, as written. The whole thing — 367 lines — stays where its author put it; the contents beside it link to each section on GitHub.
PRD to Gherkin Feature File Writer
Convert Lean PRD thành Gherkin .feature files. Mỗi scenario bắt buộc nằm trong Rule: block — không có scenario nào được phép đứng độc lập.
Ngôn ngữ
- Gherkin syntax (Feature, Rule, Scenario, Given, When, Then, And, But, Background, Scenario Outline, Examples) → tiếng Anh
- Nội dung steps, Rule description, Feature description → tiếng Việt
- Tag names → tiếng Anh (lowercase, kebab-case)
Ví dụ:
Feature: Xuất hóa đơn điện tử
As a chủ cửa hàng
I want xuất hóa đơn trực tiếp từ POS
So that tránh nhập lại dữ liệu thủ công
Rule: Chỉ merchant có gói trả phí active mới được xuất hóa đơn
@api @smoke
Scenario: Merchant gói trả phí xuất hóa đơn thành công
Given Minh có gói trả phí đang active
And Minh có đơn hàng đã hoàn thành
When Minh yêu cầu xuất hóa đơn cho đơn hàng
Then hóa đơn được tạo với trạng thái "Nháp"
Core Mental Model: PRD → Example Mapping → Feature File
PRD Section → Gherkin Construct
─────────────────────────────────────────────
Feature Name → Feature: <tên>
Bối cảnh → Feature description (narrative)
User Stories (As a...) → Persona context trong Background hoặc step names
Business Rule Must Have → Rule: <business rule> → Scenarios
Business Rule Should Have → Rule: <business rule> → Scenarios (tag @p2)
Business Rule Won't Have → Không generate scenario
Open Questions → # TODO: comment trong feature file
Rule: keyword là bắt buộc — nó nhóm scenarios theo business rule, tạo traceability ngược về PRD.
Quy tắc tuyệt đối: Scenario PHẢI nằm trong Rule
# ✅ ĐÚNG — scenario nằm trong Rule
Rule: Mã số thuế phải đúng format 10 hoặc 13 chữ số
Scenario: Merchant nhập mã số thuế 10 chữ số hợp lệ
...
Scenario: Hệ thống từ chối mã số thuế sai format
...
# ❌ SAI — scenario không nằm trong Rule, KHÔNG BAO GIỜ LÀM ĐIỀU NÀY
Scenario: Merchant nhập mã số thuế
...
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.
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.
- 12d ago First seen · 367 lines · 0 tokens per session scan A 3d70286d6533
prd-to-gherkin is a skill published in the GitHub repository cuongtl1992/vibe-skills (10 stars, last pushed 5mo ago), licensed MIT. It adds 152 tokens to every session and 3,261 once invoked, about $0.0008 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.
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