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.
Fourteen tools against Cascade's ceiling of 100, and this one is only useful with mcp-invoice enabled beside it, so budget the pair at roughly 30 tools when you decide what else fits.
| 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 mcp_config.json, and the key inside it is mcpServers.
| Scope | Path |
|---|---|
| macOS, Windows and Linux | ~/.codeium/windsurf/mcp_config.json |
{
"mcpServers": {
"billing-docs": {
"command": "npx",
"args": ["-y", "@theluckystrike/mcp-billing-docs"]
}
}
}Save and reopen the MCP Servers list; Cascade picks it up without restarting the editor.
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.
Read this first: mcp_config.json applies to the legacy Cascade agent only. The Devin Local agent, the default for new tabs, takes its servers from the Devin CLI config files, so a correct entry here can still be invisible in a fresh tab. The other hard number is a cap: Cascade reaches at most 100 tools at once, and every enabled server spends from it.
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.
~/.codeium/windsurf/mcp_config.json, under mcpServers. Reach it from the MCPs icon at the top right of the Cascade panel, or Devin Settings, Cascade, MCP Servers.
That file applies to the legacy Cascade agent only. The Devin Local agent, the default for new tabs, reads its servers from the Devin CLI config files instead. Check which agent the tab runs.
Cascade reaches at most 100 tools at any one time, and every enabled server spends from that single budget. MCP Billing Docs contributes 14 tools, so keep the enabled list short rather than counting servers.
MCP Billing Docs in detail · The same server in VS Code and Cline · Every server in Windsurf · Guides · Windsurf docs · Buy Pro