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Credit notes and purchase orders written against the invoices the invoice server already holds, with the VAT unwound at the rate you charged. It credits an invoice in full, by a gross amount or by named lines and quantities, storing every money field negative in minor units so a period's documents sum to the net of what was billed, and it refuses to give back more than the invoice's remaining creditable amount. It also raises purchase orders to suppliers with line items, VAT, currency and an expected delivery date, receives them in full or in part, and reports credited and on-order totals per currency alongside deliveries past their date.
The invoice that needs crediting was written by mcp-invoice in this same window and its PDF is already in Documents, so "credit INV-2026-0001 in full" needs no invoice number looked up and no figures retyped: the credit note copies the stored line totals rather than recomputing them from a rounded unit price.
| You say | Tool |
|---|---|
| Credit invoice INV-2026-0001 in full, the client sent the work back. | credit_note_create |
| Raise a purchase order to Nordic Print for 500 brochures at 1.20 each, due the 20th. | purchase_order_create |
| Which purchase orders are past their delivery date? | billing_docs_report |
Crediting ten percent of a mixed-VAT invoice at a single rate and splitting it across the invoice's own rates give the same gross, EUR 177.00, and VAT lines that differ by EUR 6.10, 22.6 percent. The client's document and the payment are identical either way, so nothing downstream ever surfaces the error; only the VAT return does. The split is done at the point the document is written.
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": {
"billing-docs": {
"command": "npx",
"args": ["-y", "@theluckystrike/mcp-billing-docs"]
}
}
}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-billing-docs is pending; until then use the .mcpb bundle or a clone and build from the latest release.
There is no hosted endpoint for this one yet. MCP Billing Docs runs locally over stdio with the config above, which is also the only form in which it reads and writes files on your own disk. Three of the servers in this collection are served at https://mcp.zovo.one/mcp/<name> over MCP streamable HTTP: time-tracker, price-tracker and invoice.
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: 5 documents a calendar month, credit notes and purchase orders together, counted by issue date. Both text exports are never metered, and full, partial and per-line credit notes, VAT, multiple currencies and receiving orders are all on the free tier. Pro is $19 once, verified offline.
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.
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.
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.
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