alphabetical_search

THE RISK

Low Risk

Why alphabetical_search needs a policy

This tool performs a query operation that retrieves company data based on search criteria. It has no side effects, does not modify data, execute code, delete records, or involve financial transactions. It is a straightforward read operation consistent with public company search functionality provided by Companies House API.

From the tool's definition Tool description states 'Search companies alphabetically by name prefix' — a retrieval operation with no modification or execution capability.

Documented attack patterns abuse exactly the kind of access alphabetical_search gives an agent:

POLICY

How to control alphabetical_search

PolicyLayer is an MCP gateway — it sits between your AI agents and Companies House MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for alphabetical_search:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "alphabetical_search": {}
  }
}

alphabetical_search is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register Companies House MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More Companies House MCP Server tools

Read advanced_company_search Advanced search for companies with multiple filters Read dissolved_search Search for dissolved companies Read get_charge_details Get details of a specific charge Read get_charges Get charges registered against a specific company Read get_company_profile Get detailed profile information for a specific company Read get_corporate_officer_disqualification Get disqualification details for a corporate officer Read get_document_content Fetch a document content (PDF) Read get_document_metadata Fetch a document

All 37 Companies House MCP Server tools →

Read tools on other servers

M-Team MCP Server get_torrent_detail YouTube MCP Server search_channel Android Forensics ADB MCP Server parse_browser_history 0xarchive web3_challenge

Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about alphabetical_search

What does the alphabetical_search tool do? +

Search companies alphabetically by name prefix. It is categorised as a Read tool in the Companies House MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on alphabetical_search? +

Register the Companies House MCP Server MCP server in PolicyLayer and add a rule for alphabetical_search: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Companies House MCP Server. Nothing to install.

What risk level is alphabetical_search? +

alphabetical_search is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit alphabetical_search? +

Yes. Add a rate_limit block to the alphabetical_search rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block alphabetical_search completely? +

Set action: deny in the PolicyLayer policy for alphabetical_search. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides alphabetical_search? +

alphabetical_search is provided by the Companies House MCP Server MCP server (stefanoamorelli/companies-house-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Companies House MCP Server tool call.

Start from Companies House MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →