AI agents call get_document_content 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 and returns document content from the Companies House API without modifying, deleting, or executing any operations. It is a read-only data retrieval function with minimal security risk. The severity is low because accessing publicly available company documents through official APIs poses negligible harm even if misused by an agent.
From the tool's definition Tool name 'get_document_content' and description 'Fetch a document content (PDF)' indicate a retrieval operation with no modification or execution capability.
Documented attack patterns abuse exactly the kind of access get_document_content 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_content:
{
"version": "1",
"default": "deny",
"tools": {
"get_document_content": {}
}
}get_document_content 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 content (PDF). 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_content: 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_content 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_content 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_content. 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_content 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.