meta_create_custom_audience

THE RISK

Medium Risk

Why meta_create_custom_audience needs a policy

This tool creates and modifies data (custom audiences) within a Meta ad account, which is reversible—audiences can be deleted or modified later. It does not execute arbitrary code, delete data irreversibly, or move money. While it could enable targeting for unwanted ads if misused, the primary action is creating a new resource, placing it in the Write category.

From the tool's definition Creates a new custom audience in a Meta ad account. The tool accepts parameters like ad_account_id, name, subtype, and customer_file_source to create audience segments for advertising purposes.

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

POLICY

How to control meta_create_custom_audience

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_create_custom_audience:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "meta_create_custom_audience": {
      "limits": [
        {
          "counter": "meta_create_custom_audience_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

meta_create_custom_audience stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. 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.

LIMIT THIS TOOL →

Free to start. No card required.

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

All 200 Meta MCP Server tools →

Write tools on other servers

M-Team MCP Server download_torrent YouTube MCP Server generate_video_title Android Forensics ADB MCP Server combine_reports 0xarchive web3_signup

Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about meta_create_custom_audience

What does the meta_create_custom_audience tool do? +

Creates a new custom audience in a Meta ad account. Supported types: - CUSTOM: Website visitors (requires Pixel), app activity, or customer list - ENGAGEMENT: People who engaged with your content - VIDEO: People who watched your videos Args: - ad_account_id (string): Ad account ID (e.g., act_123456789) - name (string): Audience name - subtype (string): CUSTOM, ENGAGEMENT, VIDEO, WEBSITE, or APP - description (string, optional): Audience description - customer_file_source (string, optional): For CUSTOM type — USER_PROVIDED_ONLY, PARTNER_PROVIDED_ONLY, BOTH_USER_AND_PARTNER_PROVIDED - retention_days (number, optional): Days to retain audience members (1–180) Returns the new audience ID. Note: Populating the audience with users is a separate step requiring the Audiences API to upload hashed data or configure a rule. It is categorised as a Write tool in the Meta MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on meta_create_custom_audience? +

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

meta_create_custom_audience is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit meta_create_custom_audience? +

Yes. Add a rate_limit block to the meta_create_custom_audience 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_create_custom_audience completely? +

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

meta_create_custom_audience 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.

What meta_create_custom_audience does on Meta MCP Server