Feature Specification Skill

Feature Specification Skill

Generate structured feature specifications with Business Rules (BR), User Stories (US), and Acceptance Criteria (AC).

When to Use This Skill

Use this skill when the user wants to:

• Document project features systematically
• Extract feature specifications from existing code
• Design features for a new project interactively
• Create a structured requirements document
• Visualize feature dependencies

Trigger phrases:

• "Create feature list for this project"
• "Document the features"
• "What features does this codebase have?"
• "Help me plan features for..."
• "Generate requirements specification"
• "Extract business rules from code"

Core Concepts

Feature Phases

Features are organized into 6 phases based on their role:

Phase	Prefix	Description
Core	core-	Fundamental entities (users, products, orders)
Workflow	workflow-	Business processes (checkout, approval)
Lifecycle	lifecycle-	State transitions, notifications
Analytics	analytics-	Reporting, metrics, dashboards
Integration	integration-	External APIs, third-party services
UI	ui-	User interface components

Identifier Format

Each requirement uses a standardized identifier:

• BR-XXX-YYY — Business Rule (e.g., BR-USR-001)
• US-XXX-YYY — User Story (e.g., US-USR-001)
• AC-XXX-YYY — Acceptance Criteria (e.g., AC-USR-001)

Where:

• XXX — 3-letter domain code (USR, ORD, PAY, etc.)
• YYY — Sequential number (001, 002, ...)

Feature Anatomy

## BR-XXX-001: Business Rule Title

**Description**: What this rule defines

**Rationale**: Why this rule exists

### User Stories

#### US-XXX-001: As a [role], I want [goal]

**Acceptance Criteria:**
- [ ] AC-XXX-001: Given [context], when [action], then [outcome]
- [ ] AC-XXX-002: Given [context], when [action], then [outcome]

Two Operating Modes

Analyze Mode

For existing codebases:

1. Scan models, routes, services
2. Extract entities and operations
3. Infer business rules from code
4. Generate feature specifications
5. Detect dependencies from imports

Design Mode

For new projects:

1. Ask about project type
2. Identify user roles
3. Define core workflows
4. Plan integrations
5. Generate feature specifications

Output Structure

docs/technical-requirements/features/
├── README.md                      # Index with dependency graph
├── 00-template.md                 # Feature template
├── core-01-user-management.md     # Core features
├── core-02-authentication.md
├── workflow-01-order-creation.md  # Workflow features
├── lifecycle-01-notifications.md  # Lifecycle features
├── analytics-01-reports.md        # Analytics features
├── integration-01-email.md        # Integration features
└── ui-01-admin-panel.md           # UI features

References

• Feature Template — Full feature file structure
• Phases — Detailed phase definitions
• ID Conventions — Identifier format rules
• Dependency Graph — Mermaid graph generation

Key Principles

Idempotency

• Check if files exist before creating
• Merge new content with existing during re-analysis

Preserve Manual Edits

<!-- manual -->
This content is preserved during regeneration
<!-- /manual -->

Cross-Reference Validation

• Warn about non-existent dependencies
• Detect circular dependencies

Status Inference

• draft — File exists, no code yet
• in_progress — Code exists, tests failing
• completed — Code + tests passing