EARS Pattern Authoring

Interactive assistant for creating requirements using EARS (Easy Approach to Requirements Syntax) patterns.

EARS Patterns Overview

Pattern	Use When	Template
Ubiquitous	Always true	The system SHALL [action]
Event-Driven	Triggered by event	WHEN [event], the system SHALL [action]
State-Driven	Depends on state	WHILE [state], the system SHALL [action]
Unwanted	Handle failures	IF [condition], THEN the system SHALL [action]
Optional	Feature-dependent	WHERE [feature], the system SHALL [action]
Complex	Multiple conditions	Combination of above

Workflow

1. Gather Context

   • If argument provided, analyze the requirement description
   • If --interactive, prompt for requirement details

2. Pattern Selection

   • Spawn spec-author ears agent
   • Agent guides through pattern selection based on:
     • Is this always true? → Ubiquitous
     • Triggered by an event? → Event-Driven
     • Depends on system state? → State-Driven
     • Handling an error/failure? → Unwanted
     • Optional feature? → Optional
     • Multiple conditions? → Complex

3. Construct Requirement

   • Fill in pattern template
   • Validate EARS syntax
   • Check for common anti-patterns

4. Generate Acceptance Criteria

   • Create Given/When/Then scenarios
   • Cover happy path and edge cases

5. Output

   • Display formatted requirement
   • Optionally append to specification file

Arguments

• $ARGUMENTS - Requirement description to convert to EARS
• --interactive - Step-by-step guided authoring
• --append - Append to specification file
• --pattern - Force specific pattern (ubiquitous, event, state, unwanted, optional, complex)

Examples

# From description
/spec-driven-development:ears-author "User can log in with email and password"

# Interactive mode
/spec-driven-development:ears-author --interactive

# Force pattern
/spec-driven-development:ears-author "Handle timeout errors" --pattern unwanted

# Append to spec
/spec-driven-development:ears-author "Session expires after 30 minutes" --append .specs/auth/spec.md

Pattern Selection Guide

                    ┌─────────────────────┐
                    │ What triggers this? │
                    └─────────┬───────────┘
                              │
           ┌──────────────────┼──────────────────┐
           │                  │                  │
           ▼                  ▼                  ▼
    ┌──────────┐       ┌──────────┐       ┌──────────┐
    │ Nothing  │       │ An event │       │ A state  │
    │(always)  │       │          │       │          │
    └────┬─────┘       └────┬─────┘       └────┬─────┘
         │                  │                  │
         ▼                  ▼                  ▼
    Ubiquitous         Event-Driven       State-Driven


    ┌─────────────────────────────────────────────┐
    │ Is this handling an error or failure case? │
    └─────────────────────┬───────────────────────┘
                          │
                    ┌─────┴─────┐
                    │    Yes    │
                    └─────┬─────┘
                          │
                          ▼
                      Unwanted

Output Format

## FR-X: [Generated Title]

WHEN the user submits valid login credentials,
the system SHALL authenticate the user
AND create a session token.

### Acceptance Criteria

- [ ] AC-X.1: Given valid email and password, when submitted, then user is authenticated
- [ ] AC-X.2: Given valid credentials, when authenticated, then session token is returned
- [ ] AC-X.3: Given invalid password, when submitted, then authentication fails with error

Related Commands

• /spec-driven-development:ears-convert - Convert between EARS and other formats
• /spec-driven-development:gherkin-author - Create Gherkin scenarios
• /spec-driven-development:specify - Generate full specification