Open-source tool registry-mcp lets developers add company registries in hours

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An open-source project called registry-mcp, which currently supports Norway's Brønnøysundregistrene company registry, has been designed so that adding a new country requires only one new folder and a single import line. Developers must implement just four methods — validate_id, lookup, search, and deadlines — while the base class automatically handles standardised JSON responses across all countries. A built-in stub system lets contributors build and test a new registry in isolation without it appearing in live results until it is ready. The project includes fixtures from live APIs for offline testing and a rules_markdown method so AI agents can read legal deadline rules without repeated API calls. The maintainers have identified Denmark's CVR and Sweden's Bolagsverket as the next candidates and are inviting contributors to claim a country code via the MIT-licensed GitHub repository.

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