Log in

Claude Desktop

Your books, inside the AI assistant you already use.

Add the AccountsOS MCP server to Claude Desktop and ask it anything about your accounts. Same 60+ tools as in-app chat, read or write.

Start free trialSee how it works

Free npm package, live today

Claude Desktop
MCP ServerLive
What's my cash position today?
F£28,340 across your connected accounts, as of your last bank sync.
FFinn answered from inside Claude Desktop.
Live

In short

AccountsOS ships an official Model Context Protocol (MCP) server as the npm package @thriveventurelabs/accountsos-mcp. Add it to Claude Desktop's settings and Claude can read your books (transactions, balances, VAT, deadlines, reports) and, with confirmation, write to them (create invoice, log expense, run payroll, post journal). Same 60+ tools as the in-app chat.

npm
Public package
60+
MCP tools
Free
To install

Everything it does

Set-up

  • Install: npx @thriveventurelabs/accountsos-mcp init
  • Generate an API key from AccountsOS Settings → API Keys
  • Paste it into Claude Desktop's MCP config
  • Restart Claude Desktop: done

What Claude can do

  • Read every part of your books (transactions, balances, VAT, deadlines, reports, contacts, projects, payroll, dividends, DLA)
  • Write with confirmation (create / send / pay invoices, log expenses, run payroll, post journals, add bank rules)
  • Generate reports (P&L, balance sheet, trial balance, VAT) on demand
  • Search documents and HMRC guidance
  • Cite sources in answers

Security

  • API keys scoped per-user, revocable any time
  • Read-only mode available (no write tools exposed)
  • API key usage tracked (last used, request count)
  • Rate limits per API key

Capabilities at a glance

Official MCP npm package

60+ tools exposed to Claude Desktop

Read-only and write-enabled modes

OAuth-style secure linking

API key rotation and revocation

API key usage tracking

ChatGPT MCP and Gemini MCP scaffolded for next release

How It Works

1

Install the MCP server

Run `npx @thriveventurelabs/accountsos-mcp init` once.

2

Generate an API key

Settings → API Keys → 'New' in AccountsOS. Copy the key.

3

Paste into Claude Desktop

Add the server config to Claude Desktop's MCP settings, paste the API key, restart.

4

Chat with Claude

'What's my VAT 9-box this quarter?': Claude calls our MCP, returns the answer with sources cited.

By the numbers

@thriveventurelabs/accountsos-mcp
npm package
One-line install
OAuth-style
API key linking
Secure pairing with your account
Read or write
Two modes
Read-only by default; write is opt-in

Real-world Use Cases

Morning planning in Claude Desktop

You start your day in Claude. Ask 'What's my cash position, what's overdue, what's coming up?': Claude reads from AccountsOS and gives you a single brief.

Drafting from research

You're researching a US expansion in Claude. Ask 'create a US LLC entity in my AccountsOS and seed it with the standard chart of accounts': done.

Quick invoice

'Invoice Acme £4k + VAT for January retainer.' Claude drafts it, asks you to confirm, sends. Without leaving your AI assistant.

Plays nicely with

Claude Desktop

Live

Primary supported MCP client.

ChatGPT MCP

Coming Soon

Same server works once OpenAI ships native MCP.

Gemini MCP

Coming Soon

Same server works once Google ships native MCP.

Cursor / Cline / Claude Code

Live

Any MCP-compliant client works.

Why founders pick this over the spreadsheet

Use AccountsOS without leaving Claude

Same intelligence as in-app, on your desktop AI

Free: no add-on cost for MCP access

Read-only mode for safer 'just give me the data' workflows

Future-proof: same protocol works in any MCP-aware AI client

Frequently Asked Questions

What is MCP?

Model Context Protocol: Anthropic's open standard for connecting AI assistants to external tools and data. Claude Desktop is the first major client to support it. AccountsOS ships an official MCP server.

How do I install it?

`npx @thriveventurelabs/accountsos-mcp init` will install and walk you through linking it to Claude Desktop in about a minute.

Is it safe?

API keys are scoped to your user and revocable at any time. We support a read-only mode that exposes no write tools. API key usage is tracked (last used, request count).

Can Claude Desktop modify my books?

Only if you enable write mode. Even then, every write requires Claude to call a tool that returns a confirmation request: you tap to approve before anything happens.

Will this work with ChatGPT or Gemini?

As soon as those clients ship native MCP, yes: the same server will work. Today, Claude Desktop is the primary client, plus any other MCP-compliant tool like Cursor or Cline.

Does it cost extra?

No: MCP access is included on every plan included on every paid plan (14-day free trial, then £20/month + VAT).

Explore more of AccountsOS

Ask Finn (AI Chat)

Talk to your books. Ask anything. Finn does the work.

Voice Bookkeeping

Hands-free accounting. Drive, walk, cook: talk to your books.

Finn Gets to Know You

Finn learns you, your business and your history, and uses it in every answer.

Messaging Channels

Wherever you message, you can do accounting.

Ready to try Claude Desktop & MCP?

Set up in minutes. Finn works in the background on your books, wherever you're based.

Get Started Free

MCP access is free on every plan, included on every paid plan (14-day free trial, then £20/month + VAT).

Free for 14 days, no credit card, cancel anytime