# Planning Design

> Design technical architecture, select technology stack, and define implementation strategy from specifications and constitution constraints.

- Skill: `majiayu000/planning-design` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds add majiayu000/planning-design`
- Raw SKILL.md: https://api.skillmd.com/api/skills/majiayu000/planning-design/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: majiayu000 (https://skillmd.com/u/majiayu000)
- Updated: 2026-09-09
- Page: https://skillmd.com/skills/majiayu000/planning-design

---


# Planning Design

## Overview

Convert a specification into a concrete technical plan with architecture decisions, technology selections, implementation strategy, and risk assessment. All decisions must trace back to specification requirements and comply with constitution constraints.

## When to Use

- After specification is approved, before task decomposition
- When evaluating technology stack options for a feature
- When designing system architecture for new components
- When assessing implementation risks and defining mitigations

## Key Principle

Architecture decisions must be traceable to specification requirements. Technology choices must comply with constitution constraints. Trade-offs must be documented for every significant decision.

## Process

1. **Assess technology stack** - Evaluate options against constitution requirements
2. **Design architecture** - Components, interfaces, data model, integration points
3. **Define strategy** - Phases, milestones, testing strategy, deployment approach
4. **Assess risks** - Identify risks and define mitigations
5. **Human review** - Approve architecture and strategy before task breakdown

## Tool Use

Invoke via babysitter process: `methodologies/spec-kit/spec-kit-planning`
Full pipeline: `methodologies/spec-kit/spec-kit-orchestrator`