Companies House
Let your agent search UK Companies House, pull filings and officers, and run due diligence while you validate a niche or B2B idea.
Overview
io.github.aicayzer/companies-house is an Idea-phase MCP server that connects AI agents to the UK Companies House API for search, filings, officers, and due diligence.
What is this MCP server?
- MCP server plus CLI over the official UK Companies House API
- Company search, filings, and officer data for due diligence
- Free API key from developer.company-information.service.gov.uk
- npm package companies-house-mcp v3.0.1 with stdio transport
- Environment variable COMPANIES_HOUSE_API_KEY for auth
- MCP server version 3.0.1
- One required env var: COMPANIES_HOUSE_API_KEY
- Repository: github.com/aicayzer/companies-house-mcp
Community signal: 9 GitHub stars.
What problem does it solve?
Builders manually tab between Companies House and their IDE when researching UK competitors and corporate structure.
Who is it for?
UK-focused indie founders, B2B SaaS builders, and agents doing supplier or partner checks on British limited companies.
Skip if: Founders who only need US or EU registry data, or teams without any UK market exposure.
What do I get? / Deliverables
After registration, your agent can query UK company records, officers, and filings from the same workflow where you take notes and scope the product.
- Agent-callable UK company search and filing tools
- Optional CLI usage for the same API outside the agent
Recommended MCP Servers
Journey fit
Company and competitor intelligence is a first-class Idea-phase activity before you commit build time. Competitors subphase covers structured lookups on registered entities, officers, and filings—not generic web search.
How it compares
Official UK corporate registry MCP, not a privacy-oriented meta-search or Bitcoin wallet integration.
Common Questions / FAQ
Who is io.github.aicayzer/companies-house for?
Solo builders and small teams researching UK companies, competitors, or counterparty risk through an AI coding agent.
When should I use io.github.aicayzer/companies-house?
In the idea or validate phase when you need registrar-backed facts on UK entities before prototyping or pricing a B2B offer.
How do I add io.github.aicayzer/companies-house to my agent?
Register a free API key at developer.company-information.service.gov.uk, set COMPANIES_HOUSE_API_KEY, install companies-house-mcp v3.0.1, and add the stdio MCP entry in Claude Code or Cursor.