How does this help with API design?

The skill provides standardized tables and schemas for documenting endpoints, request/response structures, and data flow patterns.

A Software Design Document (SDD) is a detailed technical plan that describes how a software system will be built, covering architecture, data models, APIs, and security protocols.

Is this template suitable for complex system architectures?

Yes, it includes dedicated sections for high-level context, architectural strategies, and detailed component-level designs, making it suitable for both small features and large-scale systems.

Does this skill follow a specific documentation standard?

Yes, it follows the widely-used Atlassian 8-section structure, ensuring your documentation is professional and covers all necessary technical bases.

Can I link this to my existing PRD?

Absolutely. The template includes a Requirement Traceability section specifically designed to map design decisions directly back to product requirements (REQs).

Technical Design Document Generator

Name: Technical Design Document Generator
Author: jsegov

byjsegov

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Learning & Documentation

Generates comprehensive, standardized software design documents using the Atlassian 8-section structure to bridge the gap between PRDs and implementation.

This skill provides a robust framework for creating professional software design documents (SDD) directly within Claude Code. By following a standardized 8-section structure—covering system architecture, API design, data modeling, and security—it ensures that technical specifications are thorough, consistent, and traceable back to original requirements. It is an essential tool for senior developers and architects who need to document complex system decisions, evaluate architectural alternatives, and provide clear, actionable implementation roadmaps for engineering teams.

Key Features

01Includes requirement traceability mapping from PRD to technical design

02Generates structured sections for architectural decisions and alternatives

038 GitHub stars

04Implements the industry-standard Atlassian 8-section SDD structure

05Provides standardized templates for API design, data models, and schemas

06Includes a comprehensive quality checklist for finalizing technical specs

Use Cases

01Converting a Product Requirement Document (PRD) into a technical implementation plan

02Documenting architectural decisions and system constraints for team alignment

03Designing new microservices with documented API contracts and data models

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add jsegov/shipspec-claude-code-plugin sdd-template

For use in Claude.ai and ChatGPT

Download Skill