get_psc_corporate_entity

THE RISK

Low Risk

Why get_psc_corporate_entity needs a policy

This tool retrieves publicly available corporate entity information from the UK Companies House PSC register. It performs a read-only query operation without side effects. The data retrieved is already public and accessible through official channels.

From the tool's definition Tool name 'get_psc_corporate_entity' and description 'Get corporate entity with significant control' indicate retrieval of existing PSC (Person with Significant Control) registry data from Companies House.

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

POLICY

How to control get_psc_corporate_entity

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 get_psc_corporate_entity:

policy.json

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

get_psc_corporate_entity 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 alphabetical_search Search companies alphabetically by name prefix 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)

All 37 Companies House MCP Server tools →

Read tools on other servers

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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 get_psc_corporate_entity

What does the get_psc_corporate_entity tool do? +

Get corporate entity with significant control. 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 get_psc_corporate_entity? +

Register the Companies House MCP Server MCP server in PolicyLayer and add a rule for get_psc_corporate_entity: 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 get_psc_corporate_entity? +

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

Can I rate-limit get_psc_corporate_entity? +

Yes. Add a rate_limit block to the get_psc_corporate_entity 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 get_psc_corporate_entity completely? +

Set action: deny in the PolicyLayer policy for get_psc_corporate_entity. 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 get_psc_corporate_entity? +

get_psc_corporate_entity 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 →