search_sub_entities | PolicyLayer

WHAT IT DOES

What search_sub_entities does on Norwegian Business Registry MCP Server

AI agents call search_sub_entities to retrieve information from Norwegian Business Registry MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

THE RISK

Low Risk

Why search_sub_entities needs a policy

This tool performs a search operation to retrieve information about sub-entities from the Norwegian Business Registry. Search and query operations are classified as Read category because they only retrieve or query data with no side effects. The tool does not create, modify, delete, or execute any actions—it simply returns matching records based on filter criteria.

From the tool's definition Tool name 'search_sub_entities' and description 'Search for Norwegian business sub-entities (underenheter) with various filters' indicate a query/search operation that retrieves data without modification or execution.

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

POLICY

How to control search_sub_entities

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

policy.json

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

search_sub_entities 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 Norwegian Business Registry 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 Norwegian Business Registry MCP Server tools

Read get_entity Get detailed information about a specific Norwegian business entity Read get_entity_roles Get all roles for a specific entity Read get_entity_updates Get updates on entities for maintaining a local copy of the registry Read get_icnpo_categories Get ICNPO (International Classification of Non-Profit Organisation) categories Read get_municipalities Get all Norwegian municipalities Read get_municipality Get information about a specific Norwegian municipality Read get_organizational_form Get information about a specific organizational form Read get_organizational_forms Get all organizational forms used in the Norwegian business registry

All 15 Norwegian Business Registry 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 search_sub_entities

What does the search_sub_entities tool do? +

Search for Norwegian business sub-entities (underenheter) with various filters. It is categorised as a Read tool in the Norwegian Business Registry MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on search_sub_entities? +

Register the Norwegian Business Registry MCP Server MCP server in PolicyLayer and add a rule for search_sub_entities: 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 Norwegian Business Registry MCP Server. Nothing to install.

What risk level is search_sub_entities? +

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

Can I rate-limit search_sub_entities? +

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

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

search_sub_entities is provided by the Norwegian Business Registry MCP Server MCP server (reidar80/brreg-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Norwegian Business Registry MCP Server tool call.

Start from Norwegian Business Registry 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 →

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15 Norwegian Business Registry MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.