Connect UK Companies House to Claude
Query UK Companies House directly from Claude. Arlet links the two through one MCP connection and takes care of API keys.
Connects your AI client to the Companies House Public Data API (api.company-information.service.gov.uk), the official register of companies in England, Wales, Scotland and Northern Ireland.
Tools (all read-only):
- search_companies: search the register by name or number and get company numbers, status, type, incorporation date and registered address.
- get_company_profile: full profile of one company (status, type, SIC codes, accounts and confirmation statement due dates, registered office, previous names).
- list_officers: current and resigned directors and secretaries with role, appointment/resignation dates, nationality and occupation.
- list_filing_history: filings (accounts, confirmation statements, officer changes, charges, resolutions ...) with an optional category filter.
- list_persons_with_significant_control: PSC register entries (individuals, corporate entities, legal persons) with their natures of control.
Authentication: HTTP Basic with your own API key (free registration at the Companies House Developer Hub; 600 requests per 5 minutes per key).
Licence: Companies House data is Crown copyright and reusable under the Open Government Licence v3.0. Each response carries the source and licence.
How to connect UK Companies House to Claude
- 1
In the Arlet dashboard, open Data tools, find UK Companies House, set the API key issued by UK Companies House and switch it on.
- 2
In Claude, open Organization settings → Connectors from the account menu at the bottom left, then click + Add.
- 3
Choose Custom → Web, enter "Arlet" as the Name and https://mcp.arlet.dev/mcp/ as the Remote MCP server URL, then click Add. Authentication settings are auto-detected, so keep the defaults.
- 4
The first time you use it, sign in with Google. After that, every service you switched on in Arlet is available from Claude.
Adding a connector is done by an organization admin on Team / Enterprise plans. On Pro / Max you can add it for yourself from Settings → Connectors with the same steps.