meta_list_business_assets

THE RISK

Low Risk

Why meta_list_business_assets needs a policy

This is a pure query/enumeration tool that retrieves metadata about business assets without modifying, executing, or deleting anything. The most severe risk is information disclosure if an unauthorized agent gains access to enumerate assets tied to a business account, but the blast radius is limited to visibility — no destructive or financial actions are possible through this tool alone.

From the tool's definition Tool name contains 'list' and description states 'Lists assets' — a retrieval operation with no side effects. It queries existing data (pages, ad accounts, Instagram accounts, pixels) associated with a Business Manager.

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

POLICY

How to control meta_list_business_assets

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

policy.json

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

meta_list_business_assets 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 Meta 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.

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EXPLORE

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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 meta_list_business_assets

What does the meta_list_business_assets tool do? +

Lists assets (pages, ad accounts, Instagram accounts, pixels) for a Business Manager. Args: - business_id: Business Manager ID - asset_type:. It is categorised as a Read tool in the Meta MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on meta_list_business_assets? +

Register the Meta MCP Server MCP server in PolicyLayer and add a rule for meta_list_business_assets: 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 Meta MCP Server. Nothing to install.

What risk level is meta_list_business_assets? +

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

Can I rate-limit meta_list_business_assets? +

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

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

meta_list_business_assets is provided by the Meta MCP Server MCP server (oliverames/meta-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Meta MCP Server tool call.

Start from Meta 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 →