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+---
+name: architecture-design
+description: A detailed guide and template for creating architecture design documents. Use only when designing architecture.
+allowed-tools: Read, Write
+---
+
+# Architecture Design Skill
+
+This skill is a detailed guide for creating high-quality architecture design documents.
+
+## Prerequisites
+
+Before starting architecture design, check the following:
+
+### Required Documents
+
+1. `docs/product-requirements.md` (PRD)
+2. `docs/functional-design.md` (functional design document)
+
+Architecture design defines the system structure and technology stack
+needed to technically realize the PRD's requirements and functional design.
+
+## Priority of Existing Documents
+
+**Important**: If an existing architecture design document is present at `docs/architecture.md`,
+follow this priority order:
+
+1. **The existing architecture design document (`docs/architecture.md`)** - highest priority
+   - It documents project-specific technology choices and design
+   - It takes precedence over this skill's guide
+
+2. **This skill's guide** - reference material
+   - General-purpose templates and examples
+   - Use when there is no existing design document, or as a supplement
+
+**When creating new**: Refer to this skill's template and guide
+**When updating**: Update while preserving the structure and content of the existing design document
+
+## Output Destination
+
+Save the architecture design document you create to:
+
+```
+docs/architecture.md
+```
+
+## Referencing the Template
+
+When creating an architecture design document, use the template while referring to the following guide:
+- Guide: ./guide.md
+- Template: ./template.md