Companies House MCP Server

Read the UK Companies House public register from your terminal, your scripts, or an AI assistant. Search companies, read their records, trace ownership, pull filings and download the filed documents themselves. It runs locally over stdio via the published package.

People connecting API integration tools to Claude, Cursor, VS Code, or another MCP client. The project is written in TypeScript.

VERIFIED ACTIVE

LAST COMMIT 2026-08-04 · ★ 13 · #68 OF 250 MAINTAINED API INTEGRATION · VERIFIED 2026-08-25

MIT · TypeScript servers · how we verify → /methodology

01 · Install Companies House

Claude Code

claude mcp add aicayzer-companies-house-mcp -- npx -y companies-house-mcp

Claude Desktop / Cursor / VS Code - add to config

{
  "mcpServers": {
    "aicayzer-companies-house-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "companies-house-mcp"
      ]
    }
  }
}

Same JSON for Cursor. For VS Code, rename the top-level key from `mcpServers` to `servers`.

Using another client? Same JSON, different key

Claude Desktop · mcpServers

Cursor · mcpServers

VS Code · servers

Windsurf · mcpServers

Zed · context_servers

Cline · mcpServers

Roo Code · mcpServers

Continue · mcpServers

LibreChat · mcpServers

Gemini CLI · mcpServers

Codex CLI · mcp_servers

Full setup guides: every client.

02 · Evidence

Security posture

What to check before giving this server access to your agent - from the registry, GitHub, and our own probes. We don't score safety; we show what's verifiable.

runs as local process (stdio) - runs on your machine with your user's permissions

license MIT - declared in the repository

npm package companies-house-mcp - unscoped; check the name against the project README before installing

registry namespace io.github.aicayzer is GitHub-verified and matches the repo owner

03 · What Companies House can do

Prose above is summarized from the project's README and registry record - no invented capabilities.

Latest releases

v4.0.0 · 2026-08-04

companies-house-mcp 4.0.0 and companies-house-cli 2.0.0. · A major release. The register summaries now say what they actually know, documents come back to the caller instead of the server's disk, every tool has a CLI…

v2.1.0 · 2026-03-25

Visual output and publishing improvements. · Diagram skill - guides Claude to generate Mermaid diagrams from company data (ownership flowcharts, officer networks, filing timelines, tenure Gantt charts, charge…

v2.0.0 · 2026-03-25

Complete v2 rebuild. · 17 MCP tools - search, profiles, officers, filings, charges, insolvency, PSCs, exemptions, plus composite tools (company report, due diligence check, officer network) · CLI (ch command) - clean…

04 · Who maintains Companies House

companies-house is maintained by aicayzer. It's the only MCP server we track from this author; the repo dates to Jun 2025.

05 · Facts

repository: github.com/aicayzer/companies-house-mcp
category: API integration - ranked #68 of 250 actively-maintained API integration servers as of 2026-08-25.
release cadence: 1 release in the last 90 days (latest 2026-08-04)
registry: io.github.aicayzer/companies-house (active, first published 2026-03-28 · 2 versions)
packages: npm:companies-house-mcp

06 · Companies House FAQ

What is Companies House?

Is Companies House still maintained?

Yes - as of 2026-08-25, its last commit was 2026-08-04 and it shipped 1 release in the last 90 days. We re-verify nightly.

How do I install Companies House?

Run `npx -y companies-house-mcp`. You can also paste the ready-made client config above.

Does Companies House run locally?

Yes - it's a stdio server: it runs on your machine (via npx) with your user's permissions. Your data stays local unless the server itself calls external APIs.

07 · Alternatives to Companies House

Alternatives to Companies House

Maintained API integration servers if Companies House isn't the fit.

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