OpenAccountants
by openaccountants · remote · no sign-in to list tools · v1.0.0 · published by GitHub user openaccountants
Open-source AI accounting skills verified by licensed accountants (tax, VAT, payroll).
15 tools: 1 can delete or cancel things, 5 change things and 9 only read.
Scanned Oct 21, 2026
- Deletes or cancels1Claude Code: deny: see these tools
- Can't be undone0Claude Code: ask
- Changes things5Claude Code: ask: see these tools
- Only reads9Claude Code: allow: see these tools
5 checks matched something in the tool definitions. No finding is not a safety guarantee. How the checks work.
claude mcp add --transport http openaccountants https://www.openaccountants.com/api/mcpFindings
Matches of fixed checks, with the text they matched.
- Warnstart
The server marks "start" read-only (readOnlyHint: true), and its own name, description or input give the class "write".
What this check looks forMatched text
annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":false}; The name "start" says "start": a word for a change.
- Warnget_skill
The server marks "get_skill" read-only (readOnlyHint: true), and its own name, description or input give the class "write".
What this check looks forMatched text
annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":false}; The name "get_skill" says "get": a word for reading.
- Warnstart_help
The server marks "start_help" read-only (readOnlyHint: true), and its own name, description or input give the class "write".
What this check looks forMatched text
annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":false}; The name "start_help" says "start": a word for a change.
- Warnget_quote
The server marks "get_quote" read-only (readOnlyHint: true), and its own name, description or input give the class "write".
What this check looks forMatched text
annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":false}; The name "get_quote" says "get": a word for reading.
- Infolist_verifiers
The description mentions "credentials".
What this check looks forMatched text
description: "...enAccountants jurisdictions, with their credentials and the jurisdictions they cover."
Tools
Open a tool for its reasons and full description. Descriptions are the publisher's own words, shown as they are.
15 tools
Deletes or cancels 1Claude Code: deny
Changes things 5Claude Code: ask
check_audit_exemptionAnswers 'does my company need an audit?' for a private limited company in Malta (MT, Article 185(2) micro thresholds) or the UK (GB, small-company thresholds before and after 6 Apr…No findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Description, as the server wrote it Answers 'does my company need an audit?' for a private limited company in Malta (MT, Article 185(2) micro thresholds) or the UK (GB, small-company thresholds before and after 6 April 2025). A deterministic check of turnover, balance sheet total and average employees. Returns 'exempt' | 'review' | 'audit_required' | 'cannot_determine', the per-threshold table, the rule citation, and whether a named accountant has confirmed the thresholds ('draft' = source-cited draft; say which). Pass prior_year figures: most regimes are two-consecutive-year tests, so without them a qualifying year returns 'review'. 'cannot_determine' is a valid outcome (unsupported jurisdiction, wrong currency, a shape needing judgment). Use the determination as returned, not thresholds from memory.
Annotations the server declares
- title: Check statutory audit exemption
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
get_quoteCall only when the user asks what OpenAccountants charges, requests a quote, or asks whether their current fee is fair.1 finding
Why it is in this group
- The name "get_quote" says "get": a word for reading.
- The description's first verb is "call": a word for a change.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Findings
- Warn
The server marks "get_quote" read-only (readOnlyHint: true), and its own name, description or input give the class "write".
What this check looks forMatched text
annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":false}; The name "get_quote" says "get": a word for reading.
Description, as the server wrote it Call only when the user asks what OpenAccountants charges, requests a quote, or asks whether their current fee is fair. Returns the same published plans, service prices, limits, market exceptions and hourly rate as the website, plus the engagement process and contact details. Match the client's scope to the listed prices; incomplete scope means the total is provisional. Separately quoted services must be confirmed by OpenAccountants. This tool does not create an engagement.
Annotations the server declares
- title: Get an OpenAccountants fee estimate
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
get_skillOpen a skill by slug (from start, search_skills or search_rules) to answer the user's question.1 finding
Why it is in this group
- The name "get_skill" says "get": a word for reading.
- The description's first verb is "open": a word for a change.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Findings
- Warn
The server marks "get_skill" read-only (readOnlyHint: true), and its own name, description or input give the class "write".
What this check looks forMatched text
annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":false}; The name "get_skill" says "get": a word for reading.
Description, as the server wrote it Open a skill by slug (from start, search_skills or search_rules) to answer the user's question. Returns the skill's rules and method, its quality tier, the named accountant where one reviewed it, a `section_index` of sections not inlined, and a provenance footer to keep with the answer.
Annotations the server declares
- title: Read a tax skill
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
startCall this first for any tax, VAT/GST, payroll or filing question about a country or US state, such as "how much tax will I pay in Spain", "do I need to register for VAT", "when is …1 finding
Why it is in this group
- The name "start" says "start": a word for a change.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Findings
- Warn
The server marks "start" read-only (readOnlyHint: true), and its own name, description or input give the class "write".
What this check looks forMatched text
annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":false}; The name "start" says "start": a word for a change.
Description, as the server wrote it Call this first for any tax, VAT/GST, payroll or filing question about a country or US state, such as "how much tax will I pay in Spain", "do I need to register for VAT", "when is my tax return due", "is this deductible", "how is a freelancer or a company taxed in Germany", "sales tax in Texas" or "what changes if I move to Portugal". Pass the user's question as `intent` and the country or US state as `jurisdiction` ('DE', 'US-TX', 'Florida'). If no place is named, start infers one when the question makes it clear and says so in `jurisdiction_source`. Returns the skills to read next (`skills_to_load`, open each with get_skill), or what is still needed, usually the country. Covers 190+ jurisdictions; where no skill exists yet it returns a research_brief naming the official sources.
Annotations the server declares
- title: Answer a tax question (call first)
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
start_helpCall when the user has no tax question yet and opens with 'what can you do?', 'how can you help me?' or 'where do I start?'.1 finding
Why it is in this group
- The name "start_help" says "start": a word for a change.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Findings
- Warn
The server marks "start_help" read-only (readOnlyHint: true), and its own name, description or input give the class "write".
What this check looks forMatched text
annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":false}; The name "start_help" says "start": a word for a change.
Description, as the server wrote it Call when the user has no tax question yet and opens with 'what can you do?', 'how can you help me?' or 'where do I start?'. Takes no arguments. Returns the two scoping questions plus the available intents and jurisdictions; for a signed-in approved accountant, a short personal `orientation` briefing instead. Once there is a question, call `start`.
Annotations the server declares
- title: What can you help with? (no args)
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
Only reads 9Claude Code: allow
get_deadlinesFiling and payment deadlines for a country or US state: 'when is my tax return due', 'when do I file VAT', 'when is the next instalment'.No findings
Why it is in this group
- The name "get_deadlines" says "get": a word for reading.
Description, as the server wrote it Filing and payment deadlines for a country or US state: 'when is my tax return due', 'when do I file VAT', 'when is the next instalment'. Returns upcoming dates and recurring filing rhythms (monthly VAT, quarterly instalments) from the OpenAccountants tax calendar. Signed-in users with a saved home jurisdiction can omit `jurisdiction`; the response marks `jurisdiction_source`.
Annotations the server declares
- title: Tax filing deadlines
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
get_skill_sectionsFollow-up to get_skill: fetch sections it listed in `section_index` as not inlined (for example a supplier-pattern library).No findings
Why it is in this group
- The name "get_skill_sections" says "get": a word for reading.
Description, as the server wrote it Follow-up to get_skill: fetch sections it listed in `section_index` as not inlined (for example a supplier-pattern library). Pass `section_index` for one section, or omit it to get every section with its heading and markdown.
Annotations the server declares
- title: Read more sections of a skill
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
list_jurisdictionsAnswers 'which countries do you cover?' or 'what is there for [country]?'.No findings
Why it is in this group
- The name "list_jurisdictions" says "list": a word for reading.
Description, as the server wrote it Answers 'which countries do you cover?' or 'what is there for [country]?'. Returns every jurisdiction with published skills (countries as ISO 2, US states as US-XX, Canadian provinces) with skill counts, accountant-reviewed counts and the named lead accountant where there is one.
Annotations the server declares
- title: List all jurisdictions covered
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
list_rule_facetsHelper for search_rules: lists the values you can filter on (live jurisdictions, domains, roles, rule kinds, statuses, tax years, a sample of topics) and the defaults.No findings
Why it is in this group
- The name "list_rule_facets" says "list": a word for reading.
Description, as the server wrote it Helper for search_rules: lists the values you can filter on (live jurisdictions, domains, roles, rule kinds, statuses, tax years, a sample of topics) and the defaults. Takes no arguments. Use it when unsure of a filter value rather than guessing.
Annotations the server declares
- title: List queryable rule facets (no args)
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
list_skillsBrowse the skills for one jurisdiction or domain (for example every skill for 'MT', or every 'payroll' skill), each with its quality tier and verification status.No findings
Why it is in this group
- The name "list_skills" says "list": a word for reading.
Description, as the server wrote it Browse the skills for one jurisdiction or domain (for example every skill for 'MT', or every 'payroll' skill), each with its quality tier and verification status. For a specific topic, search_skills is quicker. Filter by jurisdiction, domain or role ('foundation' | 'compute' | 'orchestrator' | 'reference'). Paginated (default 100, max 200); page with offset/next_offset.
Annotations the server declares
- title: Browse tax skills
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
list_verifiersAnswers 'who reviewed this?' or 'which accountants are behind this?'.1 finding
Why it is in this group
- The name "list_verifiers" says "list": a word for reading.
Findings
- Info
The description mentions "credentials".
What this check looks forMatched text
description: "...enAccountants jurisdictions, with their credentials and the jurisdictions they cover."
Description, as the server wrote it Answers 'who reviewed this?' or 'which accountants are behind this?'. Returns the named licensed accountants who have signed off on OpenAccountants jurisdictions, with their credentials and the jurisdictions they cover.
Annotations the server declares
- title: List named accountant verifiers
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
search_rulesLook up tax rates, thresholds and rules in one or many jurisdictions, such as 'VAT rates in MT, IE and DE', 'income tax brackets for 2025' or 'rules mentioning reverse charge'.No findings
Why it is in this group
- The name "search_rules" says "search": a word for reading.
Description, as the server wrote it Look up tax rates, thresholds and rules in one or many jurisdictions, such as 'VAT rates in MT, IE and DE', 'income tax brackets for 2025' or 'rules mentioning reverse charge'. Returns a bundled markdown rule set plus each jurisdiction's official source (`official_source`). For one specific figure in one jurisdiction a skill is often more complete (search_skills then get_skill): a figure can sit in a skill without being a separate rule here, and then this returns related guidance instead. Entries tagged `GUIDANCE` are text, not values. Figures are not certified current: confirm each against `official_source` and prefer it when they disagree. By default returns all matching rules, each tagged with its verification status; status:'verified' excludes draft, needs_update and unsure rules; it still includes research-verified (source-cited) rules, so it does not mean accountant-reviewed. list_rule_facets gives the valid filter values.
Annotations the server declares
- title: Look up tax rates and rules
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
search_skillsFind the skill for a specific tax topic by keyword: a deduction, form, regime or rule such as 'home office deduction', 'Schedule C', 'reverse charge', 'crypto capital gains' or 'Be…No findings
Why it is in this group
- The name "search_skills" says "search": a word for reading.
Description, as the server wrote it Find the skill for a specific tax topic by keyword: a deduction, form, regime or rule such as 'home office deduction', 'Schedule C', 'reverse charge', 'crypto capital gains' or 'Beckham regime'. Optionally limit to one jurisdiction or domain. Returns matching skill slugs to open with get_skill. Set content_type='method' to find step-by-step methods (run them via start), each tagged accountant-reviewed or source-cited.
Annotations the server declares
- title: Search tax skills by topic
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
validate_vat_numberCheck live whether an EU VAT number is valid and registered, for example before applying a B2B reverse charge, zero-rating an intra-EU sale or onboarding a supplier.No findings
Why it is in this group
- The name "validate_vat_number" says "validate": a word for reading.
Description, as the server wrote it Check live whether an EU VAT number is valid and registered, for example before applying a B2B reverse charge, zero-rating an intra-EU sale or onboarding a supplier. Queries the European Commission's VIES registry and returns the verdict plus the registered business name and address where the authority discloses them. Coverage: the 27 EU member states plus 'XI' (Northern Ireland); use 'EL' for Greece. Other countries, including the UK, are not supported yet: say live validation is not available there rather than guessing. If the registry is down the response says so.
Annotations the server declares
- title: Validate an EU VAT number (live VIES lookup)
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
This is not a safety rating, and no finding is not a safety guarantee. The groups and findings come from fixed checks of the tool definitions the server returned on the date shown, not from its code or what it does when called. How the checks work.
Install
Pinned to version 1.0.0. Values in angle brackets are yours to fill in.
claude mcp add --transport http openaccountants https://www.openaccountants.com/api/mcpRun in a terminal.
Claude Code permissions
Allow the reads, ask before a change, deny the deletes. Paste into .claude/settings.json.
{
"permissions": {
"allow": [
"mcp__openaccountants__search_skills",
"mcp__openaccountants__search_rules",
"mcp__openaccountants__list_skills",
"mcp__openaccountants__get_skill_sections",
"mcp__openaccountants__get_deadlines",
"mcp__openaccountants__list_rule_facets",
"mcp__openaccountants__list_jurisdictions",
"mcp__openaccountants__list_verifiers",
"mcp__openaccountants__validate_vat_number"
],
"ask": [
"mcp__openaccountants__start",
"mcp__openaccountants__get_skill",
"mcp__openaccountants__start_help",
"mcp__openaccountants__get_quote",
"mcp__openaccountants__check_audit_exemption"
],
"deny": [
"mcp__openaccountants__share_with_openaccountants"
]
}
}Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. It assumes the server is installed as openaccountants. Review it before you use it.
