sdd-mcp: Skill for Claude Code

SDD Implementation Guidelines

Execute implementation following TDD methodology, SOLID principles, and security best practices.

Prerequisites

Before implementing:

1. Tasks must be approved (use sdd-status to verify)
2. Review tasks in .spec/specs/{feature}/tasks.md
3. Understand the design in .spec/specs/{feature}/design.md

Implementation Workflow

Step 1: Load Context

1. Use sdd-status MCP tool to verify all phases approved
2. Read the tasks document for current implementation
3. Identify the next task to implement

Step 2: Execute TDD Cycle

For each task:

┌─────────────────────────────────────────────────────────────┐
│  1. RED: Write Failing Test                                 │
│     - Define expected behavior                              │
│     - Run test, confirm it FAILS                           │
│                                                             │
│  2. GREEN: Write Minimal Code                               │
│     - Just enough to pass the test                         │
│     - No extra features                                     │
│     - Run test, confirm it PASSES                          │
│                                                             │
│  3. REFACTOR: Improve Code                                  │
│     - Clean up without changing behavior                    │
│     - Run tests, confirm still PASSING                     │
│                                                             │
│  REPEAT for each test case                                  │
└─────────────────────────────────────────────────────────────┘

Step 3: Apply SOLID Principles

S - Single Responsibility Principle

// GOOD: One class, one job
class UserValidator {
  validate(user: User): ValidationResult { ... }
}

class UserRepository {
  save(user: User): Promise<void> { ... }
}

// BAD: Class doing too much
class UserManager {
  validate(user: User) { ... }
  save(user: User) { ... }
  sendEmail(user: User) { ... }
  generateReport() { ... }
}