Can I use this for existing projects?

Yes, as long as you have defined the feature or change in an SDD specification file, this skill can generate a plan for implementation within your existing codebase.

Does this skill modify my source code?

No, this skill is focused strictly on planning and documentation. It appends the plan to your specification file but does not write or edit production code.

What is SDD and how does this skill help?

SDD stands for Specification-Driven Development. This skill handles the 'Plan' phase by taking a specification and turning it into a detailed technical roadmap with atomic tasks.

What is Phase Gate 1 validation?

Phase Gate 1 is a quality check that ensures a specification is complete, has no pending clarifications, includes acceptance criteria, and has been approved for implementation.

What are the requirements for using the sdd-plan skill?

You must have a valid specification (Part 1) created by the /sdd-specify skill located in your .steering/ directory.

SDD Implementation Planner

Name: SDD Implementation Planner
Author: umatoma

byumatoma

0•

Productivity & Workflow

Transforms software specifications into structured, test-first implementation plans following SDD principles.

The SDD Implementation Planner (sdd-plan) is a specialized Claude Code skill designed for the second phase of Specification-Driven Development. It bridges the gap between requirements and code by analyzing existing specifications, validating readiness through automated phase gates, and generating a structured implementation roadmap. This skill enforces architectural best practices, decomposes features into atomic, test-first tasks, and evaluates technical risks to ensure a seamless transition from theory to production-ready code.

Key Features

01Atomic Task Decomposition: Breaks down requirements into manageable 'test-first' phases with specific completion criteria.

02Phase Gate Validation: Automatically verifies specifications for clarity, acceptance criteria, and stakeholder approval.

030 GitHub stars

04Architectural Design: Maps out file structures, module boundaries, and data flows before coding begins.

05Automated Documentation: Appends comprehensive implementation plans directly to existing specification files in the steering directory.

06Simplicity Pre-check: Evaluates potential code complexity and nesting depth to maintain clean code standards.

Use Cases

01Ensuring complex software requirements are broken down into testable units to prevent scope creep.

02Converting high-level feature specifications into actionable, step-by-step technical execution strategies.

03Standardizing the planning and architectural review process across development teams using Claude Code.

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add umatoma/claude-example sdd-plan

For use in Claude.ai and ChatGPT

Download Skill