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AccountsOS

REMOTE · ACCOUNTS-OS.COM · 2 COMPONENTS

Query your live AccountsOS books: balances, transactions, VAT, deadlines, invoices.

−10 this week 68 Trust /100

Last scanned (5 hours ago)

Scores higher than 53% of remote servers

Reachable. Last reached 5 Nov 2026.

Category Finance and Payments

Recent critical change

Authorization (2 Nov 2026). See the changelog before you install this server.

Trust breakdown (7 categories)

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. How we score → Why this is hard to score →

Endpoint Security63
Transport & Reachability100
Schema Quality & AI Usability81
  • 100% of prompts and resources have a non-trivial description (not blank, and not just the item's name).Pass
  • AI-judged instruction clarity (excellent).Pass
  • Context-footprint check failed: tool/resource definitions use about 13863 tokens (~159/item across 87 items; 82 tools + 5 resources), over budget; trim descriptions and params. See how to fix → Fail
  • Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management26
  • Stability check failed: schema churn in the 8 days we've observed: 0 tool removals, 0 breaking changes, 1 auth/transport breaks, 0 additions. See how to fix → Fail
Tool Coverage100
  • 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
  • 100% of tool parameters carry a description.Pass
Tool Safety75
  • No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
  • 0 of 1 tool(s) whose name or description implies an irreversible operation declare an MCP destructiveHint annotation; "deel_calculate_take_home_pay" implies "pay" and declares readOnlyHint instead, contradicting what its own name says it does. See how to fix → Fail
  • An AI judge read all 84 captured unit(s) of tool text and found none that tries to manipulate the model reading it.Pass
Capabilities60
  • Spec-recency check failed: implements MCP spec 2025-06-18; the latest is 2026-07-28. See how to fix → Fail
Changelog

Every change we have recorded for this component, newest first. Security-relevant changes are always shown. ▲ marks a change for the better, ▼ a change for the worse; unmarked changes are neutral.

  • 4 Nov 26 +1

    No change was recorded against any check on this day. Stability & Change Management went from 19 to 23.

  • 2 Nov 26 −12
    • Authorization: pass → fail ▼ critical
    • Stability: 0.13 → fail ▼ security
    • The server rewrote its instructions, which are the text every model session reads security
    • “list_tax_rules” added an optional parameter “country” cosmetic
    • “lookup_tax_rule” added an optional parameter “country” cosmetic
  • 1 Nov 26 +1

    No change was recorded against any check on this day. Stability & Change Management went from 10 to 13. That category is still filling its 30-day observation window: 3 days of observed history at the previous scan, 4 at this one. The score rises as the window fills, whether or not the server changes.

  • 30 Oct 26 0
    • New resource “ACCOUNTS.md” functional
    • “get_bills” reworded the description of “status” cosmetic
    • “get_invoices” reworded the description of “status” cosmetic
  • 29 Oct 26 +1
    • Stability: unverified → 0.03 ▲ functional
  • 28 Oct 26 77

    First indexed and scored.

Diagnostics

Diagnostic detail from the automated scan of this channel: what the scanner observed at each step, so you can see exactly where a check passed or failed. It is informational only and never changes the trust score.

Captured 5 Nov 2026 · Probed https://accounts-os.com/api/mcp/plugin

TLS valid

Negotiated TLS 1.3 with TLS_AES_128_GCM_SHA256 .

Subject Issuer Valid from Valid until Key Signature Serial
CN=accounts-os.com CN=YR1,O=Let's Encrypt,C=US 21 Oct 2026 19 Jan 2027 RSA 2048 SHA256-RSA 5dde06db9a5e67a497b8e2920b4f41c8147
SANs: accounts-os.com
CN=YR1,O=Let's Encrypt,C=US (CA) CN=Root YR,O=ISRG,C=US 3 Sept 2025 2 Sept 2028 RSA 2048 SHA256-RSA a20253f15f2691c05dc1ce13b9bcca4e
CN=Root YR,O=ISRG,C=US (CA) CN=ISRG Root X1,O=Internet Security Research Group,C=US 13 May 2026 2 Sept 2032 RSA 4096 SHA256-RSA f24b6d17f9d9ad7cb1c9fea78782699f

Background: What to check on a remote MCP endpoint →

DNSSEC insecure

Validation of accounts-os.com. — Not signed

Zone DS Keys Algorithms Outcome
. trust_anchor 20326, 38696 8, 8 Verified
com. present 19718 13 Verified
accounts-os.com. absent Unsigned (proven) parent-signed NSEC/NSEC3 proves an unsigned delegation
Authentication No authorisation required

The endpoint answered without asking for a token. Anyone who knows the URL can reach it.

Result No authorisation required
HTTP status 200
Header Value
strict-transport-security max-age=31536000; includeSubDomains
content-security-policy default-src 'self'; script-src 'self' 'unsafe-inline' 'unsafe-eval' https://va.vercel-scripts.com https://cdn.plaid.com https://*.revolut.com https://www.googletagmanager.com https://www.google-analytics.com https://*.clarity.ms https://connect.facebook.net https://googleads.g.doubleclick.net https://www.googleadservices.com https://snap.licdn.com https://bzrcdn.openai.com; style-src 'self' 'unsafe-inline' https://fonts.googleapis.com; img-src 'self' data: blob: https:; font-src 'self' data: https://fonts.gstatic.com; connect-src 'self' https://*.supabase.co wss://*.supabase.co https://generativelanguage.googleapis.com wss://generativelanguage.googleapis.com https://api.anthropic.com https://api.resend.com https://*.ingest.de.sentry.io https://*.plaid.com https://api.simli.ai https://*.simli.ai wss://*.simli.ai https://*.livekit.cloud wss://*.livekit.cloud https://*.revolut.com https://*.google-analytics.com https://analytics.google.com https://*.analytics.google.com https://www.google.com https://stats.g.dou
x-content-type-options nosniff
x-frame-options SAMEORIGIN
referrer-policy strict-origin-when-cross-origin
permissions-policy camera=(self), microphone=(self), geolocation=()

Background: How OAuth 2.1 works in the 2026 MCP spec →

Transports 2 probes
Transport URL Outcome Status Location
streamable-http https://accounts-os.com/api/mcp/plugin Verified 200
http (plaintext) http://accounts-os.com/api/mcp/plugin HTTPS enforced 308 https://accounts-os.com/api/mcp/plugin
MCP tools · 82 exposed · ~13,681 tokens

The tools this component advertises to a client, with an estimated token cost for each. Expand a tool to see its parameters and schema. The per-tool counts are indicative and are not scored directly; the schema's total context footprint is one signal in Schema Quality & AI Usability. A tool's description is untrusted text the model reads on every call, which is what makes this list a security surface and not just an inventory: how tool poisoning works →

Tool Tokens
get_profit_and_loss ~93

Get Profit and Loss (income statement) report for a period.

NameTypeReqDescription
companystring–Which company to read, by name or id, when the account has more than one (see list_companies). Leave it out to use the only company, or the default.
from_datestring–Start date (YYYY-MM-DD)
to_datestring–End date (YYYY-MM-DD)

No output schema declared.

No examples provided.

get_project_pnl ~181

Get a deal/project's mini P&L: income, costs by category, and net margin, computed from bank transactions linked to it, plus invoice/bill/expense-claim commitment summaries. Use for "how is project X doing", "project profit", "mini P&L for a project", and for the final report when a project completes. Pass project_id if known, or project_name to resolve it by name.

NameTypeReqDescription
companystring–Which company to read, by name or id, when the account has more than one (see list_companies). Leave it out to use the only company, or the default.
project_idstring–Project ID (preferred if known)
project_namestring–Project name to resolve if project_id is not known. Case-insensitive; errors with candidate names if ambiguous.

No output schema declared.

No examples provided.

get_projects ~111

List projects (pipeline, active, completed). Use when the user asks about their projects, deals, or pipeline.

NameTypeReqDescription
companystring–Which company to read, by name or id, when the account has more than one (see list_companies). Leave it out to use the only company, or the default.
searchstring–Search by project name
statusstring–Filter by status: pitched, won, in_progress, completed, lost, all (default: all)

No output schema declared.

No examples provided.

get_qfzp_status ~171

Get the active company's QFZP (Qualifying Free Zone Person) status for UAE Corporate Tax. Returns the qualifying/non-qualifying income split, de minimis status (ok / warning / breach), free zone name, substance declaration state, and per-zone smart hints (e.g. audited accounts requirement, designated zone VAT, trade license expiry). Returns `applicable: false` for UK or UAE mainland companies. Use when the user asks about QFZP status, whether they still qualify, their de minimis headroom, or whether they'll owe 9% CT.

NameTypeReqDescription
companystring–Which company to read, by name or id, when the account has more than one (see list_companies). Leave it out to use the only company, or the default.

No output schema declared.

No examples provided.

get_reconciliation_status ~295

Reconciliation per bank account: every uploaded statement with its own opening and closing balance as printed, the books' balance at its end date, the difference and whether they agree (month by month), plus the unreconciled transaction count and the newest unreconciled lines. Use it for "does the bank agree?", "what was the closing balance in March?", before quoting any reconciliation difference, when the user asks to check the books against the bank statements, or about reconciliation progress. This tool only reads: to actually reconcile ("reconcile what you can", "match the receipts", "reconcile my bank") call auto_match_receipts, which does the matching. Never say everything is reconciled without a result from this tool, get_attention or auto_match_receipts. Never say you cannot read balances off statements. Each statement row carries period_start, period_end, opening_balance, closing_balance, book_balance_at_end, difference, agrees and document_id. Pass bank_account_id to look at one account. It also gives the link to download the reconciliation report (PDF or Excel), the report to give an accountant who asks for one.

NameTypeReqDescription
bank_account_idstring–Limit to one bank account (optional).
companystring–Which company to read, by name or id, when the account has more than one (see list_companies). Leave it out to use the only company, or the default.

No output schema declared.

No examples provided.

get_recurring_invoices ~87

List recurring invoice templates. Use when user asks about recurring invoices, scheduled invoices, or subscription billing.

NameTypeReqDescription
companystring–Which company to read, by name or id, when the account has more than one (see list_companies). Leave it out to use the only company, or the default.
statusstring–Filter by status (default: active)

No output schema declared.

No examples provided.

get_risk_flags ~146

List the entries Finn flagged for a second look before they reach a VAT return: suspect or duplicate receipts and invoices, VAT added to a zero-rated purchase, VAT that does not fit the total, personal-looking purchases and amounts out of line with a supplier. Use when the user asks about flagged, suspect, duplicate or odd entries, or when get_attention shows entries needing a second look. Each flag has entity_type, entity_id, label, severity, title and detail.

NameTypeReqDescription
companystring–Which company to read, by name or id, when the account has more than one (see list_companies). Leave it out to use the only company, or the default.

No output schema declared.

No examples provided.

get_statement_checks ~136

Each imported bank statement against the books: the statement's period, its opening and closing balance as printed, the book balance on the statement's end date, the difference and whether they agree. Use this to answer 'does the bank agree?', 'what was the closing balance in March?', or before quoting any reconciliation difference. Optional bank_account_id.

NameTypeReqDescription
bank_account_idstring–Limit to one bank account (optional).
companystring–Which company to read, by name or id, when the account has more than one (see list_companies). Leave it out to use the only company, or the default.

No output schema declared.

No examples provided.

get_tasks ~100

Get tasks and to-dos for the company.

NameTypeReqDescription
companystring–Which company to read, by name or id, when the account has more than one (see list_companies). Leave it out to use the only company, or the default.
completedboolean–Filter by completion status
limitnumber–Max results (default 20)
prioritystring–Filter: low, medium, high, urgent

No output schema declared.

No examples provided.

get_tax_facts ~170

Look 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.

NameTypeReqDescription
categorystringyesTax category (e.g. "income_tax", "dividends", "mileage")
companystring–Which company to read, by name or id, when the account has more than one (see list_companies). Leave it out to use the only company, or the default.
itemstring–Specific item within the category (optional — omit for all items)
tax_yearstring–Tax year (e.g. "2025-26"). Defaults to current.

No output schema declared.

No examples provided.

get_transactions ~310

Get 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. For currency-split income totals prefer get_income_by_currency.

NameTypeReqDescription
categorystring–Filter by category
companystring–Which company to read, by name or id, when the account has more than one (see list_companies). Leave it out to use the only company, or the default.
directionstring–in = income; out = expense
from_datestring–Start date (YYYY-MM-DD)
limitnumber–Max results (default 50, max 100)
max_amountnumber–Maximum amount
max_confidencenumber–Only lines whose categorisation confidence is below this percentage (0 to 100). Lines with no confidence score are included.
min_amountnumber–Minimum amount
needs_reviewboolean–Only the lines Finn could not place with confidence: the same set as the 'transactions need a look' count.
offsetnumber–Skip this many rows (default 0) for pagination
searchstring–Search in description
to_datestring–End date (YYYY-MM-DD)
uncategorisedboolean–Only lines with no category.

No output schema declared.

No examples provided.

get_trial_balance ~87

Get Trial Balance showing all account balances.

NameTypeReqDescription
companystring–Which company to read, by name or id, when the account has more than one (see list_companies). Leave it out to use the only company, or the default.
from_datestring–Start date (YYYY-MM-DD)
to_datestring–End date (YYYY-MM-DD)

No output schema declared.

No examples provided.

get_vat_periods ~193

List 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", or before calculating/locking/submitting — it gives you the period_id you need for the other VAT tools.

NameTypeReqDescription
companystring–Which company to read, by name or id, when the account has more than one (see list_companies). Leave it out to use the only company, or the default.
limitnumber–Max periods to return (default 12).
statusstring–Optional filter: open, ready, locked, submitted, overdue, failed.
yearstring–Optional 4-digit year filter (e.g. "2026").

No output schema declared.

No examples provided.

get_vat_summary ~127

Get VAT summary for a calendar quarter, or for any VAT period with start_date and end_date

NameTypeReqDescription
companystring–Which company to read, by name or id, when the account has more than one (see list_companies). Leave it out to use the only company, or the default.
end_datestring–Last day of the VAT period, YYYY-MM-DD
quarterstring–Calendar quarter (e.g., "Q1 2025")
start_datestring–First day of the VAT period, YYYY-MM-DD

No output schema declared.

No examples provided.

get_year_on_year ~153

How this year compares with last year and the years before: are we up or down on last year, revenue and profit trend, margin, cash at year end, year on year, same time last year, how did last year go. Returns the completed years (from the ledger or the filed accounts), the current year to date against the same months last year, and Finn's read of the trend. Use it before any 'how are we doing', planning or forecasting answer when the company has history.

NameTypeReqDescription
companystring–Which company to read, by name or id, when the account has more than one (see list_companies). Leave it out to use the only company, or the default.

No output schema declared.

No examples provided.

link_company ~144

Save 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 theirs. Returns the year-end and the deadlines it set up: tell the user what they are.

NameTypeReqDescription
companystring–Which company to read, by name or id, when the account has more than one (see list_companies). Leave it out to use the only company, or the default.
company_numberstringyesThe confirmed Companies House number to link and save.

No output schema declared.

No examples provided.

list_categories ~78

List available transaction categories for categorization

NameTypeReqDescription
companystring–Which company to read, by name or id, when the account has more than one (see list_companies). Leave it out to use the only company, or the default.
typestring–Filter by type: income, expense, asset, liability, equity

No output schema declared.

No examples provided.

list_companies ~56

List 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.

Input schema present but exposes no named parameters.

No output schema declared.

No examples provided.

list_employees ~93

List active employees for the company. Use when the user asks about their employees, staff, team members, or headcount.

NameTypeReqDescription
companystring–Which company to read, by name or id, when the account has more than one (see list_companies). Leave it out to use the only company, or the default.
include_inactiveboolean–Include terminated/on_leave employees (default false)

No output schema declared.

No examples provided.

list_opportunities ~159

List sales pipeline opportunities/deals. Shows prospects, their stage, value, and next actions.

NameTypeReqDescription
companystring–Which company to read, by name or id, when the account has more than one (see list_companies). Leave it out to use the only company, or the default.
limitnumber–Max results (default 50)
stagestring–Filter by pipeline stage name
statusstring–Which deals to return, judged by the pipeline stage: "active" = still in play (default), "won" = in a closed-won stage, "lost" = in a closed-lost stage, "all" = every deal. This is NOT the project de…

No output schema declared.

No examples provided.

list_tax_rules ~228

List all available verified tax/accounting rule keys for the active company's country (every live country has a library), optionally filtered by category. Use this when you need to find the right key for lookup_tax_rule.

NameTypeReqDescription
categorystring–Optional category filter. UK categories: vat, corporation_tax, self_assessment, paye, mtd, companies_house, dividends, directors, expenses, capital_gains, capital_allowances, pensions, income_tax, na…
companystring–Which company to read, by name or id, when the account has more than one (see list_companies). Leave it out to use the only company, or the default.
countrystring–ISO country code of the business, such as GB, IE or US. Pass it when the user has not connected AccountsOS. Once connected, leave it out and their company's country is used.

No output schema declared.

No examples provided.

lookup_company ~346

Look up a company on its official register: search by name to find candidates, or fetch a single company by its number to get the full public record. UK companies come from Companies House (registered name, number, status, incorporation date, registered office address, SIC codes, directors/officers, and filing deadlines). Irish companies come from the CRO (registered name, CRO number, status, company type, incorporation date, registered address and the annual return date); a CRO number is digits only. Use this during onboarding to find and confirm the user's company ("is this your company?"). Read-only: it does NOT save anything; use link_company to save the confirmed company. If the result says the lookup is not available, tell the user plainly and take their company details directly with update_company. French companies come from the Annuaire des Entreprises (registered name, SIREN, status, legal form, incorporation date, registered address, activity code and officers); search by name or by SIREN (9 digits). Other countries have no register lookup; ask the user for their company details directly.

NameTypeReqDescription
companystring–Which company to read, by name or id, when the account has more than one (see list_companies). Leave it out to use the only company, or the default.
company_numberstring–Exact company number to fetch the full record + directors + deadlines. Use once you know the number (e.g. after the user confirms a search candidate).
querystring–Company name to search for (returns up to ~10 candidates with number, status, and address). Use when you have a name but not a number.

No output schema declared.

No examples provided.

lookup_tax_rule ~631

Look up a verified tax or accounting rule by its key. The system automatically routes to the active company's own country library: every live country has one (e.g. India: gst-rate-slabs, personal-income-tax-slabs-new-regime), so never tell a user you only know UK rules. Use this for ANY question about specific deadlines, thresholds, notice periods, regulatory dates, or rules where being wrong would mislead the user. UK examples: vat-registration-threshold, ct-filing-deadline, mtd-itsa-mandatory-50k, dividend-allowance-2026-27, mileage-rates-2026-27. UAE examples: ct-rates, ct-filing-deadline, vat-rate, free-zone-qfzp, no-personal-income-tax. Returns the exact answer + an official source URL you MUST cite in your reply, and where the rule has a validity period, the dates it applies between. ALWAYS prefer this over stating a rule from memory. Apply the rule to the user's facts: when the answer turns on a fact only the user knows (when goods were delivered, when work was finished, when money arrived), ask for that fact, never for the conclusion (ask "when did you deliver it?", not "does it belong in Q3 or October?"). Once the user gives the fact, that is the fact: state the result the rule gives for it, with the source, and do not add that you cannot check it or that their accountant should confirm it. Point to an accountant only when the rule itself leaves the question open. For a question about a PAST period, or a FUTURE one (next year's rates where a budget has already set them), pass as_of so you get the rule for that date rather than the current one. If you do not know the exact key, call list_tax_rules first.

NameTypeReqDescription
as_ofstring–Optional ISO date (YYYY-MM-DD) the answer must be true for. Pass this whenever the question is about a PAST period - a prior-year return, an old invoice, a historic filing - or a FUTURE one such as n…
companystring–Which company to read, by name or id, when the account has more than one (see list_companies). Leave it out to use the only company, or the default.
countrystring–ISO country code of the business, such as GB, IE or US. Pass it when the user has not connected AccountsOS. Once connected, leave it out and their company's country is used.
keystringyesThe rule key. Use list_tax_rules to see all available keys for the active company's country.

No output schema declared.

No examples provided.

month_close_summary ~215

Composite read returning everything needed to close a month in one call: P&L for the period, balance-sheet snapshot at period end, VAT summary if registered, unreconciled transaction count, outstanding invoices, and overdue deadlines. Use when the user asks about month-end, "how did we do in [month]", a period close, or wants a one-shot business health view. It saves several round-trips compared to calling each report tool separately.

NameTypeReqDescription
companystring–Which company to read, by name or id, when the account has more than one (see list_companies). Leave it out to use the only company, or the default.
period_endstring–YYYY-MM-DD end of the period (e.g. 2026-05-31). Defaults to the last day of the previous calendar month.
period_startstring–YYYY-MM-DD start of the period (e.g. 2026-05-01). Defaults to the first day of the previous calendar month.

No output schema declared.

No examples provided.

read_company_wiki ~117

Read 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.

NameTypeReqDescription
companystring–Which company to read, by name or id, when the account has more than one (see list_companies). Leave it out to use the only company, or the default.
slugstring–Page slug (e.g. "index", or a specific topic). Defaults to "index".

No output schema declared.

No examples provided.

read_wiki ~144

Read 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.

NameTypeReqDescription
companystring–Which company to read, by name or id, when the account has more than one (see list_companies). Leave it out to use the only company, or the default.
pagestringyesWiki page name (e.g. "index", "corporation-tax", "vat", "ir35", "us-sales-tax-nexus"). Use "index" to see all pages.

No output schema declared.

No examples provided.

recall_conversations ~247

Recall what you and the user discussed in PAST conversations (across earlier sessions, including voice and video calls). Call this whenever the user asks "what were we talking about last time?", "remind me what we discussed", "where did we leave off?", "what did we cover yesterday?", or refers back to an earlier chat. Returns recent conversation summaries newest-first — each with a short summary, the key topics, any decisions made, and open action items, plus when it happened. ALWAYS call this before saying you don't remember — you DO have access to past conversations through this tool. (Distinct from read_company_wiki, which is curated durable facts, not the back-and-forth of past chats.)

NameTypeReqDescription
companystring–Which company to read, by name or id, when the account has more than one (see list_companies). Leave it out to use the only company, or the default.
limitnumber–How many recent conversations to recall (default 5, max 15).
querystring–Optional keyword to filter to conversations about a topic (e.g. "VAT", "payroll", "the Acme invoice").

No output schema declared.

No examples provided.

search_company_wiki ~80

Search this company's private memory wiki by keyword. Returns matching page slugs, titles and excerpts.

NameTypeReqDescription
companystring–Which company to read, by name or id, when the account has more than one (see list_companies). Leave it out to use the only company, or the default.
querystringyesSearch keyword

No output schema declared.

No examples provided.

search_documents ~146

Search 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).

NameTypeReqDescription
companystring–Which company to read, by name or id, when the account has more than one (see list_companies). Leave it out to use the only company, or the default.
querystring–Search query (optional when filtering by status or type)
statusarray–Filter by status: pending, error, processed, matched
typestring–Document type (receipt, invoice, statement)

No output schema declared.

No examples provided.

search_tax_facts ~110

Search UK tax knowledge by keyword when unsure which category/item to look up. Returns matching tax facts across all categories.

NameTypeReqDescription
companystring–Which company to read, by name or id, when the account has more than one (see list_companies). Leave it out to use the only company, or the default.
querystringyesSearch query (e.g. "employment allowance", "dividend tax")
tax_yearstring–Tax year. Defaults to current.

No output schema declared.

No examples provided.

search_wiki ~102

Search Finn's knowledge base by keyword. Returns matching page names and excerpts. Use when unsure which page covers a topic.

NameTypeReqDescription
companystring–Which company to read, by name or id, when the account has more than one (see list_companies). Leave it out to use the only company, or the default.
querystringyesSearch keyword (e.g. "marginal relief", "employment allowance", "flat rate scheme")

No output schema declared.

No examples provided.

update_company ~727

Save 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 currency, the year-end month and VAT registration. Use it during setup, and when the user corrects one of these details. For a UK or Irish limited company with a registration number, call lookup_company and then link_company instead, which fills everything from the official register. Only pass what the user told you; never guess.

NameTypeReqDescription
business_summarystring–What the business does, in one plain sentence in the user's own words, e.g. "Mobile dog groomer" or "Two-person web design agency". Save it whenever the user says what they do: it tells categorisatio…
companystring–Which company to read, by name or id, when the account has more than one (see list_companies). Leave it out to use the only company, or the default.
company_numberstring–Company/registration number (e.g. UK Companies House number, IE CRO number, DK CVR number). Setting this lets us sync filing deadlines from the registry.
countrystring–ISO 3166-1 alpha-2 country code where the business is registered (for example GB, IE, US, AU, AE). Sets which tax rules apply. Refused once the company has bookkeeping entries.
default_currencystring–ISO 4217 default currency code, e.g. GBP, EUR, USD, AED, DKK. Uppercased automatically.
entity_typestring–Business structure (e.g. "ltd" for a UK limited company, "sole_trader", "llp", "fzco" for a UAE free-zone company). Use the value appropriate to the company's country. Drives which tax rules apply.
financial_year_end_monthnumber–Month (1-12) the financial year ends. Only set when the user tells you their year-end; do not guess.
incorporation_datestring–Date the company was incorporated, YYYY-MM-DD. Pass it whenever the user tells you, and ALWAYS for a UK limited company with no company number yet (just incorporated, or not on Companies House yet):…
namestring–Registered/legal company name (the business being kept books for).
trading_namestring–Trading name / "doing business as", if different from the registered name.
vat_numberstring–VAT/GST registration number. Providing a number also marks the company VAT registered unless vat_registered is explicitly false.
vat_registeredboolean–Whether the business is VAT/GST registered. Set true when the user confirms they are registered, false when they confirm they are not. Also false for a business whose sales are all VAT-exempt and tha…

No output schema declared.

No examples provided.

Install

How do I install the AccountsOS MCP server?

AccountsOS is a hosted endpoint at https://accounts-os.com/api/mcp/plugin, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

remote · accounts-os.com

# add to Claude Code
claude mcp add --transport http paulgosnell-accountsos-mcp 'https://accounts-os.com/api/mcp/plugin'
Common questions

What is the AccountsOS MCP server?

AccountsOS is an MCP server listed in the public MCP registry as io.github.paulgosnell/accountsos-mcp. Query your live AccountsOS books: balances, transactions, VAT, deadlines, invoices. This page covers its hosted endpoint (https://accounts-os.com/api/mcp/plugin).

Is the AccountsOS MCP server safe to use?

AccountsOS scores 68 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.

What tools does the AccountsOS MCP server expose?

AccountsOS exposes 82 tools: list_companies, update_company, link_company, add_document, get_transactions, and 77 more. Their descriptions and schemas cost roughly 13,681 tokens of context every time the server is loaded.

Does the AccountsOS MCP server require authentication?

No. We connected to AccountsOS without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.

Is the AccountsOS MCP server still maintained?

AccountsOS is still listed as active in the MCP registry. We last reached this channel on 5 November 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.