c4-modeling-process

name	c4-modeling-process
description	C4 modeling methodology - design system hierarchy top-to-bottom from Context to Components. Ensures consistent, stakeholder-focused architecture documentation.

C4 Modeling Process

Use this skill to design system models following the C4 framework methodology.

Core principle: Always design top-to-bottom (C1 → C2 → C3) to ensure clarity and progressive detail.

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C4 Framework Overview

The C4 model organizes architecture documentation at four levels, each with specific purpose and audience:

Level	Name	Purpose	Audience	Detail Level
C1	Context	System boundary and external actors	Everyone (business, technical)	Highest overview
C2	Container	Major components and technologies	Architects, developers	System internals
C3	Component	Modules within a container	Developers	Low-level design
C4	Code	Classes and methods	Developers	Implementation (usually code, not diagrams)

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Step 1: Define C1 Context (System Boundary)

Goal: Establish what the system is, who uses it, and what external systems it interacts with.

Define the System

model {
  mySystem = System 'My Product' {
    description 'Core business system serving customers'
  }
}