How do I install Crayon C4?

Copy the stdio config for Cursor, Claude Desktop, Claude Code, or VS Code on this page. It uses the publisher's install, not a PlugMCP proxy.

Does Crayon C4 need an API key?

The publisher lists these environment variables: CRAYON_C4_LICENSE_KEY.

What transport does Crayon C4 use?

Crayon C4 runs locally over stdio.

Crayon C4

Q: When was Crayon C4 last checked?

Last checked 2026-10-16. Author, validate and maintain a CRAYON-C4 architecture model — never write an invalid file.

by io.github.SQUORA-NL

Author, validate and maintain a CRAYON-C4 architecture model — never write an invalid file.

Power your agent

Add this server

The publisher's own command. Not a PlugMCP endpoint.

Local command

npx -y @crayon-c4/[email protected]

Credentials from the publisher

CRAYON_C4_LICENSE_KEY — Optional. Unlocks repository scanning and AI enrichment. Without it, the free tier still gives the full local authoring loop (create/edit elements, relationships, diagrams, validation).

Provider

Claude Code

CRAYON_C4_LICENSE_KEY=<secret> claude mcp add io.github.squora-nl-crayon-c4-mcp -- npx -y @crayon-c4/[email protected]

Run in a terminal.

Claude Desktop

{
  "mcpServers": {
    "io.github.squora-nl-crayon-c4-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@crayon-c4/[email protected]"
      ],
      "env": {
        "CRAYON_C4_LICENSE_KEY": "<secret>"
      }
    }
  }
}

claude_desktop_config.json

Step-by-step: add this in Claude

Remote URL or a command on your machine? How the two installs differ

Run on PlugMCP

Host a copy with our keys and logs.

A new server you create. It is not this listing's official endpoint. Use the publisher install when you want their URL and their credentials.

Launch

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