Norwegian Business Registry MCP Server

Instructions

Implementation Reference

• src/brreg-mcp-server.ts:413-423 (handler)

  MCP CallToolRequest handler case for 'get_entity': extracts organisasjonsnummer from arguments, fetches entity data via apiClient.getEntity, and returns JSON-formatted text content.

  case "get_entity":
    const { organisasjonsnummer } = request.params.arguments as { organisasjonsnummer: string };
    const entity = await apiClient.getEntity(organisasjonsnummer);
    return {
      content: [
        {
          type: "text",
          text: JSON.stringify(entity, null, 2),
        },
      ],
    };

• src/brreg-mcp-server.ts:213-219 (schema)

  Input schema for 'get_entity' tool: requires a single 'organisasjonsnummer' string property.

  inputSchema: {
    type: "object",
    properties: {
      organisasjonsnummer: { type: "string", description: "9-digit organization number" }
    },
    required: ["organisasjonsnummer"]
  }

• src/brreg-mcp-server.ts:210-220 (registration)

  Registration of 'get_entity' tool in the ListTools response, including name, description, and input schema.

  {
    name: "get_entity",
    description: "Get detailed information about a specific Norwegian business entity",
    inputSchema: {
      type: "object",
      properties: {
        organisasjonsnummer: { type: "string", description: "9-digit organization number" }
      },
      required: ["organisasjonsnummer"]
    }
  },

• src/brreg-mcp-server.ts:83-85 (helper)

  BrregApiClient helper method that performs the actual API request to fetch entity details by organization number.

  async getEntity(orgNumber: string) {
    return this.makeRequest(`/enhetsregisteret/api/enheter/${orgNumber}`);
  }