Author, validate and maintain a CRAYON-C4 architecture model — never write an invalid file.
Connect Runs on your machine
claude mcp add crayon-c4-mcp -e CRAYON_C4_LICENSE_KEY=<CRAYON_C4_LICENSE_KEY> -- npx -y @crayon-c4/[email protected]{
"mcpServers": {
"crayon-c4-mcp": {
"command": "npx",
"args": [
"-y",
"@crayon-c4/[email protected]"
],
"env": {
"CRAYON_C4_LICENSE_KEY": "<CRAYON_C4_LICENSE_KEY>"
}
}
}
}{
"mcpServers": {
"crayon-c4-mcp": {
"command": "npx",
"args": [
"-y",
"@crayon-c4/[email protected]"
],
"env": {
"CRAYON_C4_LICENSE_KEY": "<CRAYON_C4_LICENSE_KEY>"
}
}
}
}{
"servers": {
"crayon-c4-mcp": {
"type": "stdio",
"command": "npx",
"args": [
"-y",
"@crayon-c4/[email protected]"
],
"env": {
"CRAYON_C4_LICENSE_KEY": "<CRAYON_C4_LICENSE_KEY>"
}
}
}
}Replace the values in angle brackets with your own. Keys stay on your machine; we never see them.
Tools
This server runs locally, so its tools are listed by your MCP client once it starts.
Environment variables
| Name | Description |
|---|---|
CRAYON_C4_LICENSE_KEYOptional, 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). |
Details
| Package | @crayon-c4/[email protected] (NPM, stdio) |
| First published | 3 Nov 2026 |
| Last updated | 3 Nov 2026 |
| Registry name | io.github.SQUORA-NL/crayon-c4-mcp |
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