I Built an MCP Server for UK Companies House — Search 5.5M Companies From Any AI Agent

#mcp #ai #python #opensource

If you're building AI agents that need UK company data — directors, ownership structures, filing history, accounts status — you currently have to write custom API integration code every time.

I packaged the Companies House API as an MCP server so any AI agent can query it natively.

companieshouse-mcp

6 tools available to any MCP-compatible AI agent:

Tool	What it does
search_company	Search by name or number
get_company_details	Full profile, SIC codes, accounts status
get_officers	Directors and secretaries with dates
get_ownership	PSCs, ownership percentages, voting rights
get_filing_history	Recent filings by category
check_compliance	Automated risk flags (overdue accounts, governance gaps)

The compliance check

The check_compliance tool flags real issues from public data:

Company not active (dissolved, struck-off)
Accounts overdue
No active directors
High director turnover
Unclear ownership structure
Recently incorporated

Useful for vendor due diligence and supplier assessments.

Setup for Claude Desktop

{
  "mcpServers": {
    "companieshouse": {
      "command": "python",
      "args": ["-m", "src.server"],
      "env": {
        "COMPANIES_HOUSE_API_KEY": "your-free-api-key"
      }
    }
  }
}