spec-feature

name	spec-feature
description	Creates and maintains domain specifications following the SDD approach. Use this skill when specs need to be written, features derived, or domain requirements documented. Pure domain language — no technical details like frameworks, HTTP methods, or data types.

Spec-Feature Skill

Purpose

Create domain specifications in pure business language. Specifications describe what the system should do, never how it is technically implemented.

Rules

Strict Separation

• IN the Spec: Domain requirements, business rules, actors, processes, domain terms
• NOT in the Spec: Framework names, HTTP methods, data types, queue names, database schemas, package structures

Structure of a Domain Spec

# Feature: [Feature Name]

## Context
[Why is this feature needed?]

## Actors
[Who interacts with the feature?]

## Domain Requirements
[What should the system be able to do?]

## Business Rules
[What rules apply?]

## Acceptance Criteria
[When is the feature complete?]

Anti-Patterns (FORBIDDEN in Specs)

• ❌ "The REST endpoint returns..."
• ❌ "The entity has the following fields: String name, Long id..."
• ❌ "Via RabbitMQ message..."
• ❌ "The Quarkus extension..."

Correct Domain Formulations

• ✅ "The system allows the user to..."
• ✅ "Upon receiving a request, the system validates..."
• ✅ "The requester receives a confirmation..."

Workflow

1. Analyze the user's requirement
2. Identify actors and business processes
3. Formulate purely domain-level requirements
4. Define business rules and acceptance criteria
5. Create the spec file under specs/ in the project