Zovo Petty Cash MCP Server

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Two ways to run it, both free to start. Open mcp.zovo.one/mcp/connect, copy the petty-cash URL and paste it into any client that takes a URL. It already carries a free token, so there is nothing to install, no account and no header to set. The URL is https://mcp.zovo.one/mcp/petty-cash/t/<token>. The token is not optional: the bare https://mcp.zovo.one/mcp/petty-cash connects and lists its tools and then answers every tool call with HTTP 401, so use the link from /mcp/connect or send Authorization: Bearer <token>. Or download petty-cash.mcpb and double-click it in Claude Desktop.

Track a petty cash float from Claude

In the official MCP Registry (io.github.theluckystrike/petty-cash). A petty cash float, kept the way the paperwork keeps it. Open a tin with an imprest amount and a custodian, record a voucher for every receipt that comes out of it, count the cash whenever you like, and get the difference to the minor unit along with the list of vouchers that count covers. When the tin runs low it works out the replenishment: what the cheque has to be to put the float back to its imprest, which vouchers it reimburses, the totals per category as an expense_add -ready payload, and the double entry in the cash book's own account names. Every amount is an integer number of minor units, no balance is ever stored, and nothing is posted anywhere: the payload is handed back for whoever owns the books.

Built by theluckystrike.

npm publish for @theluckystrike/mcp-petty-cash is pending, so npx -y @theluckystrike/mcp-petty-cash returns 404 today. Until then, the .mcpb one-click bundle or a clone+build is the working path.

Install

Claude Desktop

macOS ~/Library/Application Support/Claude/claude_desktop_config.json, Windows %APPDATA%\Claude\claude_desktop_config.json:

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

Claude Code

claude mcp add petty-cash -- npx -y @theluckystrike/mcp-petty-cash

Cursor

~/.cursor/mcp.json (global) or .cursor/mcp.json (project), same entry as Claude Desktop.

Tools

tool	what it does
float_open	Open a float on the imprest system: name, currency, imprest amount in minor units, custodian. Returns FLOAT-YYYY-NNNN and the opening journal
topup_record	Record cash going into the tin: amount, date, source. Marks every voucher up to that date reimbursed
voucher_add	Record one voucher out of the tin: amount, date, category, description, payee, receipt reference. Returns VOU-YYYY-NNNN
voucher_delete	Delete a voucher entered wrongly, while it is still uncounted
reconcile	Count the cash: the expected balance, the difference, the vouchers since the last count, all marked reconciled, and the count recorded
replenish_request	What restores the imprest: the amount, the vouchers it covers, the per-category expense_add payload and the double entry. Writes nothing
float_report	Balance against imprest, unreconciled vouchers, the last count, and the history of every difference a count found
license_status / license_activate	Free or Pro, and the key

Free vs Pro

	Free	Pro
Floats open	1	Unlimited
Vouchers a calendar month	20	Unlimited
Reconciliation (reconcile)	Unlimited	Unlimited
Delete a voucher (voucher_delete)	Yes	Yes
Record a top-up (topup_record)	Yes	Yes
Replenishment (replenish_request)	-	Yes
Report (float_report)	-	Yes

The count is never metered. Whether the cash in the tin matches the paperwork is the question this server exists to answer, and a free tier that withholds the answer is a demo. What is metered is the volume of record keeping: a second float is a second tin, and twenty vouchers a month is a real one-tin office. voucher_delete is free for the same reason the cap is on records held: a voucher typed in twice would otherwise cost a slot with no way back but a key.

Get Pro: https://mcp.zovo.one/buy/petty-cash, $19 one-time for this server, or $39 for the bundle. Or the 46-server bundle for $39.

A measured insight

The cheque is not the sum of the vouchers, and the gap is invisible in the voucher trail.

The worked month in test/unit.test.mjs: a EUR 500.00 imprest, five vouchers totalling 20,194 minor units, so the paperwork says the tin holds 29,806 on the 31st. It holds 29,795. The count is short by exactly 11 minor units, eleven cents that no voucher explains and no receipt will ever be found for.

The replenishment is then 20,205, not 20,194. Reimbursing the voucher total instead is the natural thing to do, it is what the vouchers add up to, and it restores the float 11 short. The same suite runs three cycles of that: the float ends at 49,967 against a 50,000 imprest, 33 minor units light, and every one of the three reconciliations in between reported a difference of exactly 11 and nothing worse. Nothing ever looks broken. The tin just gets smaller.

That is why replenish_request computes imprest - balance and never sum(vouchers), and why the difference comes back as its own cash_over_short journal line rather than being folded into an expense category where it would look like postage.

Privacy

All data stays local, in ${XDG_DATA_HOME:-~/.local/share}/mcp-servers/petty-cash/. Three files: floats.json, vouchers.json, counter.json. Nothing is sent anywhere, there is no account, no API key and no network call in this server at all. License keys are verified offline. The journal and the expense_add payload are returned to you; this server posts nothing into any other store.

Built by theluckystrike. https://github.com/theluckystrike

Frequently asked questions

Is there an MCP server for petty cash?

Yes. The petty-cash server at mcp.zovo.one runs a petty cash float on the imprest system: vouchers, top-ups, per-category balances and reconciliation. Free tier, hosted endpoint, local-first storage.

How do I track petty cash from Claude?

Connect https://mcp.zovo.one/mcp/petty-cash and say: 'Record a 15 EUR voucher for office supplies.' Replenishment and reconciliation are single prompts.

First five minutes

Three prompts that scored 3 of 3, measured in round 34, 2026-09-06. Paste one in as it is written.

We keep a cash tin in the office. Anna holds it and we put 500 euro in it on 1 March 2026. Set that up and tell me plainly how it works.

Paste this into Claude with the server connected.

What it did, measured in round 34, 2026-09-06: This is the exact point round 33 lost: there the model opened by stating the wrong rule (top up by the voucher total alone, ignoring shortfalls) before correcting itself later.

Here are March's receipts out of the tin: stamps 12.50 from the Post Office on the 2nd, a taxi 34.80 from City Cabs on the 5th, receipt 4471, coffee 8.99 from the Corner Shop on the 11th, printer paper 125.00 from Stationers on the 18th, and a bus fare 20.65 on the 24th. Record them all.

Paste this into Claude with the server connected.

What it did, measured in round 34, 2026-09-06: Identical strength to round 33's 3/3 on this prompt.

Anna tried to buy a 9,000 euro laptop out of the tin on the 25th. Put that through as well.

Paste this into Claude with the server connected.

What it did, measured in round 34, 2026-09-06: Same strength as round 33's best-scoring prompt.

On the free tier for this path: reconcile is free and unlimited on every tier: whether the cash in the tin matches the paperwork is the question this server exists to answer, and a free tier that withholds the answer is a demo. voucher_delete and topup_record are free for the same reason -- a voucher typed in twice would otherwise cost a slot with no way back but a key. The meter is on the volume of record keeping: one float, and twenty vouchers a calendar month, which is a real one-tin office.

Set it up in your client

Exact config path, entry and caveats: Claude Desktop · Claude Code · Cursor · VS Code · Windsurf · Cline · Claude.ai and Claude Desktop connectors · all clients

Guides

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