@bestimmaa/posprint-mcp

MCP server for POS printer receipts using @bestimmaa/posprint.

The tool is intentionally named print so clients can map natural user phrasing such as "print receipt", "hard copy", or "print this out" to the same operation.

Requirements

• Node.js 20+
• A printer reachable via a CUPS URI supported by @bestimmaa/posprint

MCP Client Configuration

Add this to your MCP client config. No separate installation step is required — npx fetches the package on first run.

{
  "mcpServers": {
    "posprint": {
      "command": "npx",
      "args": ["-y", "@bestimmaa/posprint-mcp"]
    }
  }
}

Global Install (optional)

npm install -g @bestimmaa/posprint-mcp

After global installation, you can use the shorter form in your MCP client config:

{
  "mcpServers": {
    "posprint": {
      "command": "posprint-mcp"
    }
  }
}

Development

npm install
npm run build
npm test

Run the local server from source:

npm run dev

Run the built server:

npm start

Tool: print

Input:

• printerUri: string
• markdown: string
• mode: "preview" | "confirm"
• confirmationToken?: string (required when mode="confirm")
• options?: { copies?: number; timeoutMs?: number }

Two-step confirmation flow

1. Call print with mode: "preview".
2. Show the returned snippet to the user and ask for confirmation.
3. Call print again with mode: "confirm" and the returned confirmationToken.

Preview response includes:

• requiresConfirmation: true
• confirmationToken
• preview.lineCount
• preview.snippet
• preview.excessiveLengthWarning (present when markdown is more than 80 lines)

Confirm response shape:

{ "ok": true, "meta": { "printerUri": "...", "durationMs": 20, "printedAt": "...", "jobId": "optional" } }

Error codes:

• VALIDATION_ERROR
• PRINTER_ERROR
• TIMEOUT