What are the prerequisites for using this skill?

You should have a completed tasks.md file (usually 20-30 tasks) and a plan.md file as part of the Spec-Flow development lifecycle.

How does this skill prevent code duplication?

It performs automated 'anti-duplication' checks by searching the existing codebase for similar functions, components, or patterns before writing any new code.

What is the primary goal of the Implementation Phase skill?

The primary goal is to execute tasks from a predefined task list using Test-Driven Development (TDD) to ensure all new code is high-quality, tested, and secure.

Does it work with different programming languages?

Yes, it is language-agnostic and supports various testing frameworks like Jest for TypeScript, Pytest for Python, and others based on your project's tech stack.

How are security and type safety handled?

The skill invokes specialized agents like security-sentry for vulnerability scanning and type-enforcer for strict TypeScript validation after implementation tasks are completed.

Spec-Driven Implementation Phase

Name: Spec-Driven Implementation Phase
Author: marcusgoll

bymarcusgoll

•

Security & Testing

Executes development tasks through a rigorous Test-Driven Development (TDD) workflow featuring automated quality gates and anti-duplication checks.

The Implementation Phase skill is a core component of the Spec-Flow framework, designed to turn planned tasks into production-grade code with high confidence. It enforces a strict Red-Green-Refactor cycle, ensuring that no code is written without a corresponding test. By integrating specialized agents for type safety and security validation, it prevents common pitfalls like code duplication, implicit type errors, and security vulnerabilities. This skill is essential for teams following Spec-Driven Development who require auditable, high-quality, and repeatable implementation workflows within Claude Code.

Key Features

01Strict TDD Workflow (Red-Green-Refactor enforcement)

02Dependency-aware task execution and parallelization strategy

03Proactive anti-duplication checks to maintain DRY principles

04Integrated security-sentry and type-enforcer validation

05Automated task status tracking and velocity updates

0618 GitHub stars

Use Cases

01Converting a detailed tasks.md list into verified source code

02Enforcing high test coverage and security standards in AI-generated code

03Managing complex feature implementations with strict technology stack constraints

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add marcusgoll/spec-flow implementation-phase

For use in Claude.ai and ChatGPT

Download Skill