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MCP Invoice in Claude Desktop

Numbered invoices with tax lines, rendered to a PDF. It stores your business profile and clients, allocates numbers that never repeat, computes per-line rounding and several VAT rates in integer minor units, and renders an A4 PDF.

The PDF is written to your disk and Claude Desktop hands you the path, so the normal flow is: ask for the invoice, then open the file from Finder or Explorer without leaving the app.

What you get in Claude Desktop

You say	Tool
Invoice Acme for 12 hours at 90 EUR plus 300 EUR setup, 23% VAT, PDF.	`invoice_create then invoice_pdf`
Which invoices are unpaid and overdue?	`overdue_report`
Mark INV-2026-0007 as paid in full.	`invoice_mark_paid`

In the audit run this issued INV-2026-0001: subtotal EUR 275.00, 23% VAT EUR 63.25, total EUR 338.25. The file on disk began with %PDF-1.3 at 2,495 bytes.

Install it in Claude Desktop

The file is claude_desktop_config.json, and the key inside it is mcpServers.

Scope	Path
macOS	`~/Library/Application Support/Claude/claude_desktop_config.json`
Windows	`%APPDATA%\Claude\claude_desktop_config.json`

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

If node came from nvm, asdf or homebrew, replace "npx" with the absolute path that which npx prints:

"command": "/Users/you/.nvm/versions/node/v22.14.0/bin/npx"

Save, then completely quit Claude Desktop and start it again. A window reload is not enough.

The npm publish of @theluckystrike/mcp-invoice is pending; until then use the .mcpb bundle or a clone and build from the latest release.

No install: the hosted endpoint

The same server runs at https://mcp.zovo.one/mcp/invoice over MCP streamable HTTP, no install. Mint a free token with curl https://mcp.zovo.one/mcp/token, or use a Pro key. It has no filesystem, so a file comes back as a one-hour download link.

{
  "mcpServers": {
    "invoice": {
      "url": "https://mcp.zovo.one/mcp/invoice",
      "headers": { "Authorization": "Bearer <token>" }
    }
  }
}

Claude Desktop notes worth knowing first

Two documented facts decide whether the entry works: every path in claude_desktop_config.json must be absolute, and a stdio server started here inherits only a limited, platform-dependent subset of environment variables. If node came from nvm or homebrew, paste what `which npx` prints instead of the bare word. The .mcpb route avoids both: Claude Desktop ships a built-in Node.js environment.

Free: 3 invoices a month with a small footer line, overdue report included. Pro is $19 once, verified offline.

Questions

Where is claude_desktop_config.json?

macOS: ~/Library/Application Support/Claude/claude_desktop_config.json. Windows: %APPDATA%\Claude\claude_desktop_config.json. There is no published Linux path. Settings, Developer, Edit Config opens the right copy and creates it if it does not exist.

I added it and MCP Invoice does not appear.

In order: did you fully quit and restart, not just close the window? Is every path absolute? And is the command resolvable, given the limited environment a stdio server inherits here? If node came from nvm, paste what which npx prints.

Can I install it without editing JSON?

Yes. An .mcpb bundle, the format renamed from .dxt, opens with Claude and shows an installation dialog. One you built yourself goes in through Settings, Extensions, Advanced settings, Install Extension.

MCP Invoice in detail · The same server in Cline and Claude Code · Every server in Claude Desktop · Guides · Claude Desktop docs