---
name: planning-design
description: Design technical architecture, select technology stack, and define implementation strategy from specifications and constitution constraints.
allowed-tools: Read, Bash, Grep, Glob, WebFetch, WebSearch, Agent, AskUserQuestion
graph:
  domains: [domain:software-engineering]
  skillAreas: [skill-area:agentic-loops, skill-area:orchestration-loop]
  workflows: [workflow:feature-development]
  topics: [topic:developer-experience]
  roles: [role:tech-lead, role:backend-engineer]
---

- 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`