meta.custom_audiences.create_lookalike

WHAT IT DOES

What meta.custom_audiences.create_lookalike does on Ads

AI agents use meta.custom_audiences.create_lookalike to create or update resources in Ads — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Ads environment.

WHY IT NEEDS A POLICY

Why meta.custom_audiences.create_lookalike needs a policy

This tool creates a new lookalike audience in Meta Ads, which is a reversible write operation (the audience can be deleted later). It does not execute code, destroy data, or move money. The dry-run default lowers the immediate risk, but misuse could result in unintended audience creation affecting ad targeting. Severity is medium given the blast radius is limited to audience configuration within ad accounts.

From the tool's definition Create a lookalike audience from a source audience. Meta builds an audience of users who resemble the source within the chosen country. Dry-run by default.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

meta.custom_audiences.create_lookalike Rate-limited

meta.custom_audiences.create_lookalike 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.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "meta.custom_audiences.create_lookalike": {
      "limits": [
        {
          "counter": "meta.custom_audiences.create_lookalike_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Ads, so you can run agents against it safely.

FAQ

Questions about meta.custom_audiences.create_lookalike

What does the meta.custom_audiences.create_lookalike tool do? +

Create a lookalike audience from a source audience. Meta builds an audience of users who resemble the source within the chosen country. Dry-run by default. It is categorised as a Write tool in the Ads 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.custom_audiences.create_lookalike? +

Register the Ads MCP server in PolicyLayer and add a rule for meta.custom_audiences.create_lookalike: 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 Ads. Nothing to install.

What risk level is meta.custom_audiences.create_lookalike? +

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

Can I rate-limit meta.custom_audiences.create_lookalike? +

Yes. Add a rate_limit block to the meta.custom_audiences.create_lookalike 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.custom_audiences.create_lookalike completely? +

Set action: deny in the PolicyLayer policy for meta.custom_audiences.create_lookalike. 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.custom_audiences.create_lookalike? +

meta.custom_audiences.create_lookalike is provided by the Ads MCP server (manlikemuneeb/ads-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.