Expert C4 Context-level documentation specialist. Creates
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npx mdskills install sickn33/c4-contextProvides structured C4 Context templates and clear guidance with solid examples
resources/implementation-playbook.md.[One-sentence description of what the system does]
[Detailed description of the system's purpose, capabilities, and the problems it solves]
[Mermaid diagram showing system, users, and external systems]
## Context Diagram Template
According to the [C4 model](https://c4model.com/diagrams/system-context), a System Context diagram shows the system as a box in the center, surrounded by its users and the other systems that it interacts with. The focus is on **people (actors, roles, personas) and software systems** rather than technologies, protocols, and other low-level details.
Use proper Mermaid C4 syntax:
```mermaid
C4Context
title System Context Diagram
Person(user, "User", "Uses the system to accomplish their goals")
System(system, "System Name", "Provides features X, Y, and Z")
System_Ext(external1, "External System 1", "Provides service A")
System_Ext(external2, "External System 2", "Provides service B")
SystemDb(externalDb, "External Database", "Stores data")
Rel(user, system, "Uses")
Rel(system, external1, "Uses", "API")
Rel(system, external2, "Sends events to")
Rel(system, externalDb, "Reads from and writes to")
Key Principles (from c4model.com):
When creating context documentation, provide:
Install via CLI
npx mdskills install sickn33/c4-contextC4 Context is a free, open-source AI agent skill. Expert C4 Context-level documentation specialist. Creates
Install C4 Context with a single command:
npx mdskills install sickn33/c4-contextThis downloads the skill files into your project and your AI agent picks them up automatically.
C4 Context works with Claude Code, Claude Desktop, Cursor, Vscode Copilot, Windsurf, Continue Dev, Codex, Gemini Cli, Amp, Roo Code, Goose, Opencode, Trae, Qodo, Command Code. Skills use the open SKILL.md format which is compatible with any AI coding agent that reads markdown instructions.