# Architecture > Define system design, interfaces, and data flow consistent with the approved plan and policies. Use when this capability is needed. - Skill: `tomevault-io/architecture-18` (Agent Skill, multi-file: 2 files) - Install (CLI): `npx skillmds@latest add tomevault-io/architecture-18` - Raw SKILL.md: https://api.skillmd.com/api/skills/tomevault-io/architecture-18/raw - Safety review: pending - Works with: Claude Code, Claude.ai, OpenAI Codex - Category: Coding & Dev Tools - Author: tomevault-io (https://skillmd.com/u/tomevault-io) - Updated: 2026-09-17 - Page: https://skillmd.com/skills/tomevault-io/architecture-18 --- ## Purpose Create an architecture outline with components, responsibilities, interfaces, data flows, and decision notes ready for review. ## Inputs - Approved plan and goals - Constraints and applicable policies - Existing system context and boundaries ## Steps 1. Confirm scope, constraints, and non-functional requirements. 2. Identify components, responsibilities, and interfaces. 3. Describe data flow, integrations, and edge cases. 4. Capture decisions, trade-offs, and open questions for review. ## Outputs - Architecture outline with components, interfaces, data flows, and decision notes. ## Failure modes - Introducing new scope or features - Omitting constraints, edge cases, or policy alignment - Providing implementation details instead of architectural guidance --- > Converted and distributed by [TomeVault](https://tomevault.io/claim/alloveralls) — claim your Tome and manage your conversions.