AI agents call get_document_metadata to retrieve information from Companies House MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves metadata about documents from the Companies House API without altering, executing, or deleting data. Fetching publicly available company documents is a read-only operation with minimal blast radius. The context of a Companies House data access server (which provides public corporate records) further supports this classification.
From the tool's definition Tool name 'get_document_metadata' and description 'Fetch a document' indicate retrieval of document metadata with no modification, deletion, or execution capabilities.
Documented attack patterns abuse exactly the kind of access get_document_metadata gives an agent:
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_document_metadata:
{
"version": "1",
"default": "deny",
"tools": {
"get_document_metadata": {}
}
}get_document_metadata is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Fetch a document. It is categorised as a Read tool in the Companies House MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Companies House MCP Server MCP server in PolicyLayer and add a rule for get_document_metadata: 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.
get_document_metadata is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the get_document_metadata 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.
Set action: deny in the PolicyLayer policy for get_document_metadata. 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.
get_document_metadata 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.
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.
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37 Companies House MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.