---
name: eu-business-jobs
description: "Step-by-step job recipes for the EU Business & VAT Checker MCP server: Find the company behind a domain; Validate an EU VAT number on VIES; Look up a Legal Entity Identifier. Use when the user asks things like \"Which company is behind the domain doctolib.fr, and how big is it?\" or \"Is the Austrian VAT number ATU33864707 valid, and who is it registered to?\""
license: MIT
---

# EU Business & VAT Checker jobs

Each section below walks through one job with the tools of the `eu-business` MCP server. The same recipes are MCP prompts (prompts/list) on `https://api.openkrill.app/gateway/mcp`.
Connect the server at `https://eubusiness.openkrill.app/mcp` in your MCP client settings (remote streamable HTTP, no key), then call its tools as normal tool calls. They are not command line programs: Bash, curl and scripts cannot reach them.

## Find the company behind a domain

Job: Find the company behind a domain, with the EU Business & VAT Checker MCP server.

Use the `company_from_domain` tool for this job.

Work on the user's request. If there is none yet, ask what they need. A request this job handles: "Which company is behind the domain doctolib.fr, and how big is it?"

Steps:
1. Call `company_from_domain` as a normal MCP tool call, with the request's values in the fields of its inputSchema. It needs `domain`.
2. If a value the tool needs is missing and you cannot tell it from the request, ask the user one short question first.
3. This input is known to work; copy its format, not its values: `{"domain":"https://www.danone.com/en/home?x=1"}`
4. For the request "Which company is behind the domain doctolib.fr, and how big is it?", a correct answer looks like this: The legal name DOCTOLIB, country FR, the SIREN, a size band and the registration date, each with a source link and a confidence; anything not found is said to be unknown.
5. Follow the server's own rules:
   - Use company_from_domain when the user has a domain, website or work email and wants the company behind it.
   - Pass the domain, such as stripe.com.
   - Give each fact with its source link and date.
   - Explain confidence: confirmed means a register checked the number or Wikidata link, name_match means only the name matched one register entry, printed_on_site means only the company's own page says it, wikidata_only means only Wikidata says it.
   - Never fill a gap: say a field in unknown is unknown and why.
   - If status is ambiguous, show the candidates and ask; if it is not_a_company_domain, give the reason.
   - Domain age is not company age.
   - A size band can be years old and covers one legal entity, not its group.
   - Send the VAT country as a two-letter code or English name (Greece is EL, Northern Ireland is XI; GB cannot be checked); ask for it if the user gave only digits.
   - Say the result is what the official source reports on that date.
   - A valid number does not show the business is trustworthy or is the one the user deals with: suggest comparing the registered name with the invoice.
   - Send requesterCountry and requesterVatNumber only when the user gives their own VAT number for proof of the check, and pass on the consultationNumber.
   - Pass on the register lag notice.
   - Companies only: if a name is withheld, say so and do not guess it.
   - Never identify or search for a private person, owner, director or employee.
   - This server does not answer VAT registration duties or VAT rates.
6. If the call fails or the answer looks wrong, tell the user, then report it with `submit_feedback` (kind bug, tool `company_from_domain`).

## Validate an EU VAT number on VIES

Job: Validate an EU VAT number on VIES, with the EU Business & VAT Checker MCP server.

Use the `check_vat_number` tool for this job.

Work on the user's request. If there is none yet, ask what they need. A request this job handles: "Is the Austrian VAT number ATU33864707 valid, and who is it registered to?"

Steps:
1. Call `check_vat_number` as a normal MCP tool call, with the request's values in the fields of its inputSchema. It needs `country`, `vatNumber`.
2. If a value the tool needs is missing and you cannot tell it from the request, ask the user one short question first.
3. This input is known to work; copy its format, not its values: `{"country":"AT","vatNumber":"U33864707"}`
4. For the request "Is the Austrian VAT number ATU33864707 valid, and who is it registered to?", a correct answer looks like this: valid true, with the registered name Red Bull GmbH and its address, the date of the check, and the notice that a valid number does not prove the business is trustworthy.
5. Follow the server's own rules:
   - Pass the domain, such as stripe.com.
   - Give each fact with its source link and date.
   - Explain confidence: confirmed means a register checked the number or Wikidata link, name_match means only the name matched one register entry, printed_on_site means only the company's own page says it, wikidata_only means only Wikidata says it.
   - Never fill a gap: say a field in unknown is unknown and why.
   - If status is ambiguous, show the candidates and ask; if it is not_a_company_domain, give the reason.
   - Domain age is not company age.
   - A size band can be years old and covers one legal entity, not its group.
   - Use check_vat_number to validate an EU or Northern Ireland VAT number, find_company_lei for a Legal Entity Identifier, and lookup_company_registry for the French or Norwegian register (other countries: use find_company_lei or say the register is not covered).
   - Send the VAT country as a two-letter code or English name (Greece is EL, Northern Ireland is XI; GB cannot be checked); ask for it if the user gave only digits.
   - Say the result is what the official source reports on that date.
   - A valid number does not show the business is trustworthy or is the one the user deals with: suggest comparing the registered name with the invoice.
   - Send requesterCountry and requesterVatNumber only when the user gives their own VAT number for proof of the check, and pass on the consultationNumber.
   - Pass on the register lag notice.
   - Companies only: if a name is withheld, say so and do not guess it.
   - Never identify or search for a private person, owner, director or employee.
   - This server does not answer VAT registration duties or VAT rates.
6. If the call fails or the answer looks wrong, tell the user, then report it with `submit_feedback` (kind bug, tool `check_vat_number`).

## Look up a Legal Entity Identifier

Job: Look up a Legal Entity Identifier, with the EU Business & VAT Checker MCP server.

Use the `find_company_lei` tool for this job.

Work on the user's request. If there is none yet, ask what they need. A request this job handles: "What is the LEI of Siemens Aktiengesellschaft in Germany, and is it active?"

Steps:
1. Call `find_company_lei` as a normal MCP tool call, with the request's values in the fields of its inputSchema.
2. If a value the tool needs is missing and you cannot tell it from the request, ask the user one short question first.
3. This input is known to work; copy its format, not its values: `{"name":"Siemens Aktiengesellschaft","country":"DE"}`
4. For the request "What is the LEI of Siemens Aktiengesellschaft in Germany, and is it active?", a correct answer looks like this: Siemens Aktiengesellschaft first, LEI W38RGI023J3WT1HWRP32, status ACTIVE, registered as HRB 6684 in Munich, with the LEI renewal date.
5. Follow the server's own rules:
   - Pass the domain, such as stripe.com.
   - Give each fact with its source link and date.
   - Explain confidence: confirmed means a register checked the number or Wikidata link, name_match means only the name matched one register entry, printed_on_site means only the company's own page says it, wikidata_only means only Wikidata says it.
   - Never fill a gap: say a field in unknown is unknown and why.
   - If status is ambiguous, show the candidates and ask; if it is not_a_company_domain, give the reason.
   - Domain age is not company age.
   - A size band can be years old and covers one legal entity, not its group.
   - Use check_vat_number to validate an EU or Northern Ireland VAT number, find_company_lei for a Legal Entity Identifier, and lookup_company_registry for the French or Norwegian register (other countries: use find_company_lei or say the register is not covered).
   - Send the VAT country as a two-letter code or English name (Greece is EL, Northern Ireland is XI; GB cannot be checked); ask for it if the user gave only digits.
   - Say the result is what the official source reports on that date.
   - A valid number does not show the business is trustworthy or is the one the user deals with: suggest comparing the registered name with the invoice.
   - Send requesterCountry and requesterVatNumber only when the user gives their own VAT number for proof of the check, and pass on the consultationNumber.
   - Pass on the register lag notice.
   - Companies only: if a name is withheld, say so and do not guess it.
   - Never identify or search for a private person, owner, director or employee.
   - This server does not answer VAT registration duties or VAT rates.
6. If the call fails or the answer looks wrong, tell the user, then report it with `submit_feedback` (kind bug, tool `find_company_lei`).