gherkin-authoring

name	gherkin-authoring
description	Use when drafting, reviewing, or improving Gherkin, Cucumber scenarios, BDD acceptance criteria, feature examples, Scenario Outlines, Backgrounds, Rules, Doc Strings, Data Tables, tags, or Gherkin embedded in Markdown.

Gherkin Authoring

Overview

Write Gherkin as executable examples of business behavior. Optimize for domain language, concrete examples, and observable outcomes; keep implementation and UI mechanics inside step definitions.

Scope

Use this for standalone .feature files and Gherkin embedded in Markdown or other prose. When Gherkin is inside a Markdown wrapper, review or rewrite only the Gherkin section unless the user asks for broader document edits. Preserve fences, headings, and surrounding prose. If the input includes Markdown around the Gherkin, return the Markdown wrapper with only the Gherkin block changed.

Workflow

1. Identify the Gherkin region: whole .feature file, fenced gherkin block, indented block, quoted acceptance criteria, or inline scenario text.
2. Preserve the surrounding wrapper unless explicitly asked to change it. For Markdown input, return the heading/prose/fence context, not just the fenced Gherkin block.
3. Clarify the behavior as examples: initial state, event, observable outcome.
4. Choose the smallest structure that expresses the behavior: Feature, optional Rule, Background, Scenario/Example, or Scenario Outline with Examples.
5. Keep scenarios concrete and short, usually 3-5 steps.
6. Review syntax and readability before returning: colons, step keywords, duplicate step text, observable outcomes, and table/doc string formatting.

Quick Reference

Construct	Use for	Syntax note
Feature:	One high-level capability per feature document or block	Requires :
Rule:	Group scenarios under one business rule	Requires :
Scenario: / Example:	One concrete example	Requires :
Background:	Short shared context for following scenarios	Requires :; one per Feature or Rule
Scenario Outline:	Same behavior with varied data	Requires Examples: and <parameter> placeholders
Examples:	Data rows for an outline	Requires : and a table
Given	Known state or precondition	No :
When	Event or action	No :
Then	Observable outcome	No :
And / But	Continue the previous step type	No :
*	Bullet-like step list	Use sparingly for list-style setup
@tag	Group or filter features/scenarios	Place above the item tagged
#	Line comment	Line comments only; no block comments
"""	Doc String	Passed as final step argument
`	`	Data Table

Authoring Rules

• Use the language domain experts use. Avoid translating business behavior into UI clicks, HTTP calls, database rows, queues, mocks, or implementation details.
• Given puts the system in a known state. Avoid user interaction in Given steps.
• When describes one meaningful event.
• Then describes an outcome visible to a user or external system. Do not assert hidden database state unless that is the actual external contract.
• Use And and But to improve flow, not to hide new phases of the scenario.
• Avoid identical step text under different step keywords; Cucumber ignores Given/When/Then when matching step definitions.
• Use two-space indentation unless preserving existing style.
• Keep Background short and vivid. If it grows beyond about four lines, use higher-level steps or split by Rule/Feature.
• Use Scenario Outline only when examples share the same behavior and differ by data.
• Escape | as \|, newline as \n, and backslash as \\ inside Data Table cells.

Example

Markdown wrapper preserved; only the Gherkin block is authored:

## Acceptance Criteria

```gherkin
Feature: Password reset
  Rule: Reset links expire after their allowed lifetime

    Scenario: Customer resets their password before the link expires
      Given Priya has requested a password reset
      And the reset link is still valid
      When Priya chooses a new password with the reset link
      Then she can sign in with the new password

    Scenario: Customer uses an expired reset link
      Given Priya has requested a password reset
      And the reset link has expired
      When Priya tries to choose a new password with the reset link
      Then she is told the reset link has expired
      And her password is unchanged
```

Common Mistakes

Mistake	Fix
Complaining about Markdown around a Gherkin block	Preserve the wrapper and work only on the Gherkin section.
Returning only a fenced Gherkin block when the input was Markdown	Return the original Markdown wrapper with only the Gherkin content changed.
Feature Checkout or Scenario: Place order:	Add the missing colon after Feature; remove extra colon from the scenario title.
Given I click the checkout button	Move interaction to When; describe state in Given.
Then an order row exists in the database	Prefer an observable result, such as an order confirmation.
Reusing the same step text for Given and Then	Change the wording so the domain meaning is distinct.
Long scripts with many UI actions	Raise the abstraction and keep the scenario to the behavior.
Large Background sections	Use higher-level context or split scenarios by Rule or Feature.