AccountsOS
Query your live accounting books: balances, transactions, VAT, invoices, bills and tax deadlines.
Connects to AccountsOS accounting software to let you check company balances, transactions, VAT summaries, invoices owed to you, bills you owe, tax deadlines, profit and loss, and upload receipts and bank statements. Supports UK, Irish and Canadian businesses.
Try asking Muse: "Show me my current cash balance and how much my clients owe me."
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Source: Found in the official MCP Registry (io.github.paulgosnell/accountsos-mcp) · First listed October 30, 2026
Last 24 hours
Each bar is one check, every 15 minutes. Green means it answered. Last checked 2 h ago.
Is it safe to connect?
What Muse can see: It does not ask you to sign in, so it cannot see your accounts. It only sees what Muse sends it from your request.
Before it acts: Read what Muse plans to do before you approve it, and remove the app from Muse when you stop using it.
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How to add it to Muse
Not in Muse's Connectors list yet, but Muse can still use it. Copy the request below and paste it into Muse. Muse asks before it shares anything with the app's site. Meta does not review apps used this way, so only use ones you trust. We tested this in the Muse app on September 24, 2026: Muse used an app's link directly this way and returned a live answer.
https://accounts-os.com/api/mcp/pluginNot in Muse's Connectors list yet. Muse can still use it: its page gives you a request to paste into Muse.
Also use it in ChatGPT or Claude
AccountsOS is a remote MCP server, so any assistant that can add a custom connector by link can use it. Same link, same tools.
Add it to ChatGPT
- 1
Open ChatGPT settings
In ChatGPT, open Settings, then Connectors (called Apps & Connectors on some accounts).
- 2
Turn on developer mode
Under Advanced settings, switch on Developer mode. That is what lets you add a connector by link.
- 3
Create the connector
Choose Create, give it a name, paste the link as the MCP server URL, and save. If it needs a sign-in, ChatGPT asks for it here.
- 4
Use it in a chat
Start a chat, open the tools menu, pick the connector, and ask. ChatGPT asks before it runs a tool the first time.
Custom connectors need a paid ChatGPT plan, and on Team, Enterprise and Edu accounts only an admin can add them. Our "Working" label means the server answered us; it cannot tell whether your plan lets you add it. All connectors that work in ChatGPT
Add it to Claude
- 1
Open Claude settings
In Claude, open Settings, then Connectors.
- 2
Add a custom connector
Choose Add custom connector, give it a name, and paste the link.
- 3
Connect and use it
If it needs a sign-in, Claude sends you to it. Then turn the connector on in a chat from the tools menu and ask.
Custom connectors are available on paid Claude plans; on Team and Enterprise accounts an admin may need to add them. Our "Working" label means the server answered us; it cannot tell whether your plan lets you add it. All connectors that work in Claude
https://accounts-os.com/api/mcp/pluginWhat people ask Muse to do
Technical details: safety screening, tools, response time and recent checks
Response time at the last check: 167ms. Worked in n/a of checks over 30 days.
Screening · October 30, 2026
Screened, no issues found
Screening looks for known threats and hidden instructions at the time of the check, and runs again weekly and whenever the tool list changes. It cannot see the server's code, so only connect what you need and review what Muse asks to do. How screening works.
Tools · 40
list_companiesList the companies this AccountsOS account can see (for an accountancy practice, its clients), with the default one marked. Call this first when the user has more than one company, then pass `company` to the other tools.update_companySave the user's answers about their own business to their AccountsOS company: what kind of business it is (entity_type, for example sole_trader or ltd), the country it is registered in (ISO code such as GB, IE, US), the company or registration number, the name, what it does, the link_companySave a UK (Companies House) or Irish (CRO) company from its official register onto the user's AccountsOS company: registered name, number, status, address, directors, year-end and filing deadlines. Call it only after lookup_company found the company and the user confirmed it is tadd_documentAdd a file the user attached in this chat to their AccountsOS books: a bank statement, a receipt, a supplier bill or a sales invoice. AccountsOS reads it the same way as an emailed document: a bank statement is imported into a bank account (created if it does not exist yet), a reget_transactionsGet transactions for the company with optional filters. Returns currency, amount_gbp and exchange_rate. A row with expected_income: true is an uploaded sales invoice still waiting to be paid, NOT money received: leave it out of any cash, income received or bank balance figure. Foget_balanceGet current account balanceget_deadlinesGet upcoming tax and filing deadlines. Each carries support (files, prepares, workpaper, reminder_only, or null for a payment) and support_note: what AccountsOS does for it. reminder_only means AccountsOS does not produce the form.get_vat_summaryGet VAT summary for a calendar quarter, or for any VAT period with start_date and end_datesearch_documentsSearch uploaded documents (receipts, invoices). Can also list documents by status without a query — status ["pending", "error"] is the Incoming queue. Called with no arguments it lists the newest uploads (up to 25).read_wikiRead a page from Finn's knowledge base — compiled UK (and US) tax and accounting guidance: rules, cross-references, edge cases, plain-English advice for company directors. Call with page="index" first to list all available pages.search_wikiSearch Finn's knowledge base by keyword. Returns matching page names and excerpts. Use when unsure which page covers a topic.read_company_wikiRead a page from this company's private memory wiki — Finn's long-term per-company notes (preferences, decisions, people, recurring Q&A). Call with slug="index" first to list available pages.search_company_wikiSearch this company's private memory wiki by keyword. Returns matching page slugs, titles and excerpts.get_tax_factsLook up current UK tax rates, thresholds and allowances (income_tax, national_insurance, corporation_tax, dividends, capital_allowances, vat, pensions, mileage, self_assessment, home_office, mtd). Returns the figure plus its source.search_tax_factsSearch UK tax knowledge by keyword when unsure which category/item to look up. Returns matching tax facts across all categories.list_categoriesList available transaction categories for categorizationget_dla_balanceGet the Director's Loan Account (DLA) balance and recent transactions. Shows if director owes company or vice versa, with section 455 tax warnings.get_invoicesGet invoices the user has raised, with summary stats on outstanding and overdue amounts. Use when user asks about invoices, outstanding payments, or money owed to them.get_contactsList contacts (clients, suppliers, leads). Use when user asks about customers, suppliers, or contacts.get_billsGet supplier bills/invoices owed by the company. Shows what you owe to suppliers.get_estimatesGet estimates/quotes sent to clients.get_profit_and_lossGet Profit and Loss (income statement) report for a period.get_balance_sheetGet Balance Sheet report as at a given date.get_trial_balanceGet Trial Balance showing all account balances.get_tasksGet tasks and to-dos for the company.get_expense_claimsGet expense claims and reimbursement requests.get_bank_accountsList bank accounts connected to the company.get_journal_entriesGet General Ledger journal entries. Double-entry accounting records.list_opportunitiesList sales pipeline opportunities/deals. Shows prospects, their stage, value, and next actions.get_opportunityGet detailed information about a specific pipeline opportunity/deal, including notes and activity history.get_income_by_currencyCurrency-split income (or expense) totals in ONE compact call: face totals grouped by each transaction currency (e.g. EUR face vs GBP face) PLUS the company functional-currency total for the same set. Use when the user asks "total income in EUR and in GBP", "how much came in in eget_financial_snapshotGet the headline money figures in one call: cash, what the company is owed (open invoices), what it owes (open bills), and net profit this month, the EXACT numbers on the user's Home dashboard. Use for "how am I doing", "how much am I owed", "what do I owe", "what's my position",get_integration_statusSee every integration for this company and user in one call: what's connected (banks, HMRC MTD, Stripe, Deel, Gmail, WhatsApp, Telegram, Slack, Xero and the rest), what's available but not connected, and whether data is actually FLOWING through each connected feed (flowing / quieget_gst_hst_returnCanada: prepare the GST/HST return (GST34) for a period: 'GST return', 'HST return', 'GST report', 'what do I owe CRA', 'my Q3 GST'. Returns every line (101 to 113C), the balance owing or refund, the due date and any warnings. Defaults to the last completed reporting period. Alwaget_gifi_statusCanada: is my GIFI ready for the T2, which accounts are not mapped or need review, and do the balance checks pass. 'is my GIFI ready', 'GIFI mapping', 'T2 schedule 100 / 125'. Maps any new accounts first. AccountsOS prepares the GIFI trial balance for the accountant's T2 softwareget_vat_periodsList the company's VAT return periods and their status (open, locked, submitted, failed, overdue), with the net VAT due, due date, and HMRC receipt for any submitted ones. Use this FIRST when the user asks about VAT returns, "which quarters are outstanding", "have I filed Q1", orget_hmrc_vat_obligationsRead the company's VAT obligations (the returns HMRC expects, with their period keys, start/end dates, due dates, and whether they are Open or Fulfilled) directly from HMRC MTD. Use when the user asks "what does HMRC say I owe a return for", "when is my next VAT return due accordget_hmrc_vat_liabilitiesRead the company's VAT liabilities (amounts HMRC says are owed and when they are due) directly from HMRC MTD. Use when the user asks "how much VAT do I owe HMRC", "what's outstanding on my VAT account". Requires HMRC MTD connected.get_hmrc_vat_paymentsRead the VAT payments HMRC has received on the company's account directly from HMRC MTD. Use when the user asks "has HMRC received my VAT payment", "what VAT have I paid". Requires HMRC MTD connected.check_vat_numberCheck a UK VAT registration number against HMRC's live Check-a-UK-VAT-number register and return the registered trader name and address. GB only. A "not registered" answer is a real answer from HMRC, not an error. Use this when the user asks whether a VAT number is valid, when adLink
https://accounts-os.com/api/mcp/pluginQuestions about AccountsOS in Muse
How do I connect AccountsOS to Muse?
Not in Muse's Connectors list yet, but Muse can still use it. Paste this into Muse: "Use AccountsOS to help me. It is a free service with an MCP server at https://accounts-os.com/api/mcp/plugin. It does not need an API key. Ask me before you share anything with it." Muse asks before it shares anything with the app's site. Meta does not review apps used this way, so only use ones you trust. We tested this in the Muse app on September 24, 2026: Muse used an app's link directly this way and returned a live answer.
Is AccountsOS working right now?
At the last check (October 30, 2026, 03:56 UTC) the endpoint was working, answering in 167ms. It is checked every 15 minutes.
Is AccountsOS safe to connect to Muse?
It was screened on October 30, 2026 with the result "screened, no issues found". Screening checks the domain against threat feeds and reads the tools for hidden instructions and requests for passwords or card numbers. It cannot see the server's code, so grant only the access you need.
What can AccountsOS do in Muse?
It exposes 40 tools, including list_companies, update_company, link_company, add_document. For example, you could ask Muse: "Show me my current cash balance and how much my clients owe me."
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This listing was added from public sources (Found in the official MCP Registry (io.github.paulgosnell/accountsos-mcp)). If you build AccountsOS, claim it to correct the details and get your badge.
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