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io.github.SQUORA-NL/crayon-c4-mcp

Official registry AI and agents

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

Source code

Install

Add this to your client's MCP configuration (Claude Desktop: claude_desktop_config.json; Cursor: .cursor/mcp.json; VS Code and others use the same "mcpServers" shape).

NPM package @crayon-c4/mcp
Claude Code 
claude mcp add crayon-c4-mcp -e 'CRAYON_C4_LICENSE_KEY=<your crayon_c4_license_key>' -- npx -y @crayon-c4/mcp@1.51.0
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "crayon-c4-mcp": {
            "command": "npx",
            "args": [
                "-y",
                "@crayon-c4/mcp@1.51.0"
            ],
            "env": {
                "CRAYON_C4_LICENSE_KEY": "<your crayon_c4_license_key>"
            }
        }
    }
}

Environment variables

  • CRAYON_C4_LICENSE_KEY secret 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).

Frequently asked questions

What is io.github.SQUORA-NL/crayon-c4-mcp?

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

How do I install io.github.SQUORA-NL/crayon-c4-mcp?

It runs on your machine. In Claude Code: claude mcp add crayon-c4-mcp -e 'CRAYON_C4_LICENSE_KEY=<your crayon_c4_license_key>' -- npx -y @crayon-c4/mcp@1.51.0. For other clients, paste the JSON configuration from this page into their MCP settings.

Does io.github.SQUORA-NL/crayon-c4-mcp need an API key?

Yes. It expects CRAYON_C4_LICENSE_KEY, which you set in its configuration.

Is io.github.SQUORA-NL/crayon-c4-mcp open source?

Its code is public on GitHub, but the repository does not declare a standard license.

Who maintains io.github.SQUORA-NL/crayon-c4-mcp?

It is published by SQUORA-NL. AI.tn lists it but does not maintain or endorse it.

From the official MCP Registry. Listing is not an endorsement: review a server's code and permissions before giving it access to your data.