registry-mcp — the company registry MCP

Company data for AI agents, any country. One MCP server and REST API, three national registers today: the United Kingdom's Companies House, looked up by company number; Norway's Enhetsregisteret / Brønnøysundregistrene (brreg), looked up by organisasjonsnummer (orgnr); and Sweden's Bolagsverket, looked up by organisationsnummer — one JSON shape whichever you ask.

claude mcp add registry-mcp --transport http https://api.foretak.dev/mcp

No install step, over stdio:

claude mcp add registry-mcp -- uvx registry-mcp

What makes it worth a tool slot:

• Deadlines that cite the rule, not just a date. company_deadlines gives the next filing date and names why in applies_because — a Norwegian legal form's statutory duty, or "Companies House publishes this date for the company itself" when the register states it rather than us computing it. Quote the reason, not just the number.
• Never more than 24 hours stale, and it says so. Every response carries cached and fetched_at. OpenCorporates' own knowledge base tells users to "allow 30 days" for a correction to reach its site — a 30× freshness gap, stated by the incumbent about itself.
• Seven tools, not fifty — five registry tools plus two ChatGPT connector aliases. Tool-selection accuracy degrades past 30-50 tools loaded into an agent's context, and some clients cap around 40. Seven tools is roughly 17% of that budget, next to competitors in this space shipping 23 to 78 tools for the same job.

Security. Read-only, always — nothing here writes to a register or anywhere else. No credentials are required from a caller; this deployment's own upstream credential (COMPANIES_HOUSE_API_KEY) is read from the environment and never logged or returned. Three named upstreams, and nothing else is ever called: data.brreg.no, api.company-information.service.gov.uk and gw.api.bolagsverket.se. No personal data beyond what each national register already publishes about the entity itself — and because a Swedish sole trader's company number is their personnummer, the usage log stores no identifier at all for a country whose identifiers can be a natural person's (legal/privacy.md). This service does not perform sanctions, PEP or adverse-media screening, and it does not verify bank account details. Details: SECURITY.md.

One-click install, for a remote streamable-HTTP server:

Other clients (Claude Desktop, Cursor, VS Code, Cline, plain JSON configs): see docs/clients.md.

Add to ChatGPT

ChatGPT reaches an MCP server through a custom connector, and its deep research mode calls exactly two tools — search and fetch — which this server ships alongside the five registry tools. In ChatGPT, open Settings → Connectors, add a custom connector, and give it:

https://api.foretak.dev/mcp

No authentication, no key, no account. If your ChatGPT plan does not show custom connectors under Settings → Connectors, turn on Settings → Security and login → Developer mode first, then add the URL from https://chatgpt.com/plugins.

search takes one free-text query — a company name, a national identifier, or a name plus a country ("Tesco United Kingdom") — and returns citable rows; fetch takes a row's id ("NO:923609016") and returns that company's register record and its statutory filing deadlines, with the full JSON of both in metadata.

Add to Claude Desktop

Claude Desktop takes the same URL as a custom connector: Settings → Connectors → Add custom connector, then https://api.foretak.dev/mcp. No key. For a local stdio install instead, see Configuration.

Status: 0.3.0, live — GET /health returns {"version":"0.3.0","countries":["GB","NO","SE"]}. The five registry tools and their response shapes are frozen; two connector aliases (search, fetch) wrap them for ChatGPT and add no new shape. The hosted API at api.foretak.dev is live, and listed in the official MCP registry as io.github.foretak/registry-mcp. Countries: United Kingdom (Companies House), Norway (brreg), Sweden (Bolagsverket) — see below for each country's identifier format and example calls.

Add to Claude Code

The same two commands as above — Streamable HTTP or local stdio. To add it as a project-level .mcp.json file instead of the CLI, see Configuration.

What it returns

$ curl https://api.foretak.dev/v1/NO/company/923609016
{
  "country": "NO", "registry": "brreg",
  "id": "923609016", "id_formatted": "923 609 016", "id_scheme": "organisasjonsnummer", "euid": null,
  "name": "EQUINOR ASA",
  "legal_form_code": "ASA", "legal_form": "Public limited company", "legal_form_local": "Allmennaksjeselskap",
  "status": "active", "is_active": true, "registered_at": "1995-03-12",
  "vat_registered": true, "vat_number": "NO923609016MVA", "vat_registered_at": "1989-07-01",
  "employees": 21239, "share_capital": 5976872600.0, "share_capital_currency": "NOK",
  "business_address": {"lines": ["Forusbeen 50"], "postal_code": "4035", "city": "STAVANGER"},
  "advertising_protected": null,
  "source": "Enhetsregisteret (Brønnøysundregistrene)", "license": "NLOD 2.0"
}

Abridged — the full CompanyReport also carries previous_names, industry_codes, registers, purpose, parent_id, confidence, cached, fetched_at and notes. Every field is documented in llms-full.txt §5.

euid is the EU-wide identifier some member-state registers publish (Finland does; none of ours do yet) — never the LEI, never constructed from parts. advertising_protected is true/false/null: whether the register marks this entity as protected against direct-marketing use, null meaning the register publishes no such flag at all (Norway and the UK, today); where it is true (Sweden's reklamspärr, for one), a notes sentence states it and that marking must travel with any contact details you pass on.

The United Kingdom, same shape, same abridgement:

$ curl https://api.foretak.dev/v1/GB/company/00445790
{
  "country": "GB", "registry": "companies-house",
  "id": "00445790", "id_formatted": null, "id_scheme": "company number", "euid": null,
  "name": "TESCO PLC",
  "legal_form_code": "plc", "legal_form": "Public limited company",
  "status": "active", "is_active": true, "registered_at": "1947-11-27",
  "vat_registered": null, "vat_number": null,
  "employees": null, "employees_reported": false,
  "registers": {"charges": false, "insolvency": false},
  "industry_codes": [{"code": "47110", "description": null, "scheme": "SIC 2007", "rank": 1}],
  "business_address": {"lines": ["Tesco House, Shire Park", "Kestrel Way"], "postal_code": "AL7 1GA", "city": "Welwyn Garden City"},
  "advertising_protected": null,
  "published_deadlines": [
    {"kind": "annual_accounts", "due_date": "2027-08-26", "period_end": "2027-02-26", "overdue": false, "source": "accounts.next_accounts.due_on"},
    {"kind": "confirmation_statement", "due_date": "2027-07-02", "period_end": "2027-06-18", "overdue": false, "source": "confirmation_statement.next_due"}
  ],
  "source": "Companies House (UK)", "license": "Crown copyright — Companies House public register, free to re-use"
}

published_deadlines carries the dates the register publishes itself, with the upstream field each came from. It is [] for Norway and Sweden, which compute all of their own.

Sweden, added in 0.3.0, is where "one shape" starts to earn the claim: