SIC Codes MCP Server

An MCP (Model Context Protocol) server giving AI agents access to UK SIC code classification (2007 and 2026), GICS/ICB cross-mappings, and Companies House company search across 5.6 million UK companies. Free to use, no API key required.

Source: siccodes.co.uk

How it works (v2)

This package is a tiny, zero-dependency proxy: it speaks MCP over stdio to your client and forwards every request to the hosted MCP server at https://siccodes.co.uk/api/mcp. You always get the live, full tool surface — the v1 packages bundled a local subset that drifted out of date.

Requires Node 18+ and a network connection. Prefer connecting directly over HTTP? Point your MCP client straight at https://siccodes.co.uk/api/mcp (streamable HTTP, no auth) and skip this package entirely.

Tools (8)

| Tool | What it does | |------|--------------| | lookup_sic_code | Look up any SIC 2007, SIC 2026, GICS or ICB code with hierarchy and cross-mappings | | search_sic_codes | Find SIC codes from a plain-English business description | | convert_between_classifications | Convert between SIC 2007, SIC 2026, GICS and ICB with confidence levels | | browse_classification_hierarchy | Browse any classification tree with company counts | | lookup_uk_company | Look up a UK company by name or registration number | | search_uk_companies_by_industry | Find UK companies by classification code with filters | | get_industry_profile | Sector intelligence: counts, locations, company types | | search_companies | Flexible company search: name, postcode, dates, classification |

Installation

Claude Desktop / Claude Code

{
  "mcpServers": {
    "sic-codes": {
      "command": "npx",
      "args": ["-y", "sic-codes-mcp"]
    }
  }
}

Any MCP client (HTTP, no install)

https://siccodes.co.uk/api/mcp

Configuration

| Env var | Default | Purpose | |---------|---------|---------| | SICCODES_MCP_URL | https://siccodes.co.uk/api/mcp | Override the upstream endpoint |

Rate limits

30 requests/minute per IP. 429 responses surface as JSON-RPC errors with the retry interval.

Data sources

UK SIC 2007 & 2026 (ONS, Crown Copyright) · Companies House (Open Government Licence) · GICS (MSCI/S&P) · ICB (FTSE Russell)