meta_list_custom_conversions

THE RISK

Low Risk

Why meta_list_custom_conversions needs a policy

This tool queries and retrieves custom conversion data from a Meta ad account. It performs read-only operations without creating, modifying, deleting, or executing anything. The blast radius of misuse is low: an attacker could enumerate custom conversions configured in an ad account, which is sensitive but non-destructive and does not directly compromise user accounts or finances.

From the tool's definition Tool name contains 'list' and description states 'Lists custom conversions for an ad account' — a pure retrieval operation with no side effects.

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

POLICY

How to control meta_list_custom_conversions

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_custom_conversions:

policy.json

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

meta_list_custom_conversions 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

Related tools and policies

More Meta MCP Server tools

Financial meta_create_adset Creates a new ad set within a campaign. Args: - ad_account_id (string): Ad account ID ( Financial meta_create_campaign Creates a new campaign in a Meta ad account. Args: - ad_account_id (string): Ad account Destructive meta_delete_ad Deletes an ad permanently. Args: - ad_id (string): Ad ID to delete Destructive meta_delete_ad_rule Deletes an automated ad rule. Args: - rule_id (string): Ad rule ID Destructive meta_delete_adset Deletes an ad set permanently. Args: - adset_id (string): Ad set ID to delete Destructive meta_delete_campaign Deletes (archives) a campaign. This cannot be undone. Args: - campaign_id (string): Cam Destructive meta_delete_comment Deletes a comment on a Facebook Page post. Permanent action. Args: - comment_id (string Destructive meta_delete_custom_audience Deletes a custom audience permanently. This cannot be undone. Args: - audience_id (stri

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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_custom_conversions

What does the meta_list_custom_conversions tool do? +

Lists custom conversions for an ad account. Args: - ad_account_id (string): Ad account ID. 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_custom_conversions? +

Register the Meta MCP Server MCP server in PolicyLayer and add a rule for meta_list_custom_conversions: 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_custom_conversions? +

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

Can I rate-limit meta_list_custom_conversions? +

Yes. Add a rate_limit block to the meta_list_custom_conversions 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_custom_conversions completely? +

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

meta_list_custom_conversions 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.

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