# OpenAccountants Muse connector

From musedirectory.ai, the independent directory of Meta Muse connectors. Not affiliated with Meta.

## OpenAccountants

Tax and accounting guidance verified by licensed accountants across 50+ jurisdictions

- Record: https://musedirectory.ai/connector/openaccountants
- Category: Finance & Bills
- Developer: OpenAccountants
- Muse status: Extra setup. Not in Muse's Connectors list yet. Muse can still use it: its page gives you a request to paste into Muse.
- Health: Working, 323ms, checked 2026-09-28T08:45:52Z
- Endpoint: https://www.openaccountants.com/api/mcp
- Auth: No account needed; Pricing: unknown
- Screening: Screened, no issues found (2026-09-24T04:05:49Z)
- Source: Found in the official MCP Registry (io.github.openaccountants/openaccountants) https://registry.modelcontextprotocol.io/v0/servers?search=io.github.openaccountants%2Fopenaccountants

Open-source accounting skills covering income tax, VAT, payroll, and compliance. Search tax rules, verify VAT numbers against government registries, check audit exemptions, and get filing deadlines. Accountant-verified for multiple countries and US states.

Example request: "Tell me what deductions I can claim on my US Schedule C and when my quarterly tax payment is due."

How to connect: Not in Muse's Connectors list yet, but Muse can still use it. Paste this into Muse: "Use OpenAccountants to help me. It is a free service with an MCP server at https://www.openaccountants.com/api/mcp. 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.

Tools:
- list_skills: List published OpenAccountants skills with their quality tier and verification status. Optionally filter by jurisdiction (e.g. 'US', 'MT', 'DE', 'GB'), domain (the accounting area, e.g. 'vat-gst', 'payroll', 'income-tax'), or role ('foundation' | 'compute' | 'orchestrator' | 'ref
- get_skill: Fetch a published skill by slug, including its current-version markdown, quality tier, named verifier (where accountant-verified), and a provenance/attribution footer.
- get_skill_sections: Fetch the parsed sections of a skill's current version. Each section has a heading and its markdown content. Use this to pull a specific section that get_skill listed in `section_index` as not inlined (e.g. a supplier-pattern library) — pass `section_index` to fetch just that one
- search_skills: Full-text search across all published tax and accounting skills. Find, lookup, query, or discover skills by keyword, tax concept, deduction type, form number, or regulation (e.g. 'home office deduction', 'crypto capital gains', 'reverse charge', 'Schedule C', '60-day reporting').
- search_rules: Sweep tax rules ACROSS jurisdictions and metadata and get back a bundled markdown rule set plus the jurisdiction's OFFICIAL SOURCE. Best for cross-cutting questions — 'VAT rates in MT, IE and DE', 'all income-tax thresholds for 2025', 'rules mentioning reverse charge'. WHEN YOU W
- get_deadlines: Upcoming filing/payment deadlines and recurring filing rhythms (monthly VAT, quarterly instalments) for a country or US state, from the OpenAccountants tax calendar. Use it whenever the user asks 'when is X due', mentions a filing date, or when a heads-up about an imminent deadli
- list_rule_facets: Returns the metadata you can filter on with `search_rules` — the live jurisdictions, the domains, roles, block types (rule kinds), statuses, tax years, and a sample of topics — plus the defaults. Call this before `search_rules` to learn the valid filter values rather than guessin
- start_help: No-argument front door — call this FIRST whenever a user asks 'how can you help me?', 'what can you do?', 'where do I start?', or otherwise opens vaguely (do NOT answer such questions by listing your tools or calling list_jurisdictions). For a signed-in approved accountant it ret
- start: Front door for any tax / accounting question once you know what the user wants. `intent` is REQUIRED (e.g. 'taxes', 'VAT return', 'set up a company', 'find deductions', 'classify transactions', 'payroll'); pass a jurisdiction too (ISO 2-letter, e.g. 'MT', 'GB', 'US-CA'). If you d
- list_jurisdictions: Returns every jurisdiction with published skills — countries (ISO 2), US states (US-XX), Canadian provinces — with skill counts, accountant-verified counts, and named lead verifier. Use when the user asks 'which countries does OpenAccountants cover?' or 'what's available for [cou
- list_verifiers: Returns named licensed accountants who have signed off on OpenAccountants jurisdictions, with their credentials and covered jurisdictions. Use when the user asks who verified a skill or wants to see the verifier network. If the user wants one of them to review their work, that go
- validate_vat_number: Check whether a business's VAT / tax-registration number is real and registered, in real time against the official government registry — and return the registered business NAME and ADDRESS when the authority discloses them. This is an authoritative, unfakeable confirmation you ca
- check_audit_exemption: DETERMINISTIC check of whether a private limited company qualifies for statutory audit exemption, from aggregate figures any ledger can provide (turnover, balance sheet total, average employees). Returns a determination ('exempt' | 'review' | 'audit_required' | 'cannot_determine'
- share_with_openaccountants: Sends feedback or a review request to OpenAccountants. This is the single outbound channel; it does nothing unless the user has explicitly asked to send feedback or to request a review. Two modes: (1) `note` — an anonymized note about the guidance (a gap, a workaround you needed,

Screening checks:
- MCP handshake: pass (Answered in 347ms)
- Domain against threat feeds (Cloudflare security DNS): pass (www.openaccountants.com not flagged)
- Published packages against the OSV malicious-package database: n/a (No npm or PyPI package published)
- Hidden instructions or invisible characters in tool text: pass (14 tools read, nothing found)
- Inputs asking for passwords, card numbers or seed phrases: pass (None found)
- Domain and redirects: pass (No redirects off the domain)
- AI review of purpose and tool behavior: pass (No concerns)