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commands/plan.md

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+---
+argument-hint: "[tech-stack]"
+description: Create comprehensive technical implementation plan from specification
+---
+
+# Implementation Plan Generator
+
+Generate a detailed technical implementation plan from a specification document and create or analyze technology stack.
+
+## Arguments
+
+$1 (Optional: specific technology stack in Korean or English format)
+
+## Instructions
+
+1. **Read `docs/spec-init.md`**: Understand feature requirements and success criteria
+2. **Determine Technology Stack**:
+   - If user provides $1: Use specified technology stack
+   - If not provided: Analyze project structure and recommend appropriate technologies
+3. **Create `docs/plan-init.md`** with the following structure:
+   - Original Tech Stack Request (record user input if provided)
+   - Technology Stack (frameworks, libraries, versions for implementation)
+   - Architecture Overview (high-level system design, component interactions)
+   - Data Models (database schema, data structures, relationships)
+   - API Design (endpoints, request/response formats if applicable)
+   - Component Structure (component hierarchy, organization, folder structure)
+   - State Management (data flow, store architecture)
+   - Security Considerations (authentication, authorization, data protection)
+   - Testing Strategy (unit, integration, E2E test approach)
+   - Deployment Plan (build process, environment configuration, CI/CD)
+   - Dependencies (packages, versions, compatibility notes)
+
+4. **Generate Report**:
+   - Summarize technology selection rationale
+   - Explain key architectural decisions
+   - Guide user to next step: run `/simple-sdd/tasks` to generate implementation tasks
+
+## Quality Standards
+
+- **Technical Feasibility**: All proposed solutions must be practically implementable
+- **Specification Alignment**: Plan must precisely match requirements from spec-init.md
+- **Implementation Detail**: Sufficiently detailed for developers to begin coding
+- **Best Practices**: Incorporates industry standards and proven patterns
+- **Scalability**: Considers future growth and maintenance
+
+## Output Format
+
+### Report Structure
+1. **Selected Technology Stack** - List of frameworks and key libraries
+2. **Architecture Highlights** - 3-5 key design decisions and their rationale
+3. **Key Components** - Major components and their responsibilities
+4. **Next Steps** - Instructions to run `/simple-sdd/tasks`
+
+## Task
+
+Based on the specification in `docs/spec-init.md` and optional technology preference in $1, create a comprehensive implementation plan. The plan should provide sufficient technical detail for experienced developers to begin implementation immediately.
+
+Generate the plan following the Structure outline and ensure each section provides actionable guidance with specific technologies, patterns, and architectural decisions.
+
+Write all content in the same language as the original specification document (Korean or English).