create_custom_audience · Meta Marketing API MCP Server MCP

WHAT IT DOES

What create_custom_audience does on Meta Marketing API MCP Server

AI agents use create_custom_audience to create or update resources in Meta Marketing API MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Meta Marketing API MCP Server environment.

WHY IT NEEDS A POLICY

Why create_custom_audience needs a policy

This tool creates new data (custom audience segments) within Meta's advertising platform, which is reversible (audiences can be deleted or modified). It is not destructive (audiences persist and can be undone), not a read operation, and not financial.

From the tool's definition Tool is named 'create_custom_audience' and described as 'Create a custom audience'. The verb 'create' indicates data creation. The context of Meta Marketing API for advertising shows this creates audience segments for ad targeting purposes.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_custom_audience Rate-limited

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.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "create_custom_audience": {
      "limits": [
        {
          "counter": "create_custom_audience_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 Meta Marketing API MCP Server, so you can run agents against it safely.

FAQ

Questions about create_custom_audience

What does the create_custom_audience tool do? +

Create a custom audience. It is categorised as a Write tool in the Meta Marketing API 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 create_custom_audience? +

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

What risk level is create_custom_audience? +

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 create_custom_audience? +

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

Set action: deny in the PolicyLayer policy for 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 create_custom_audience? +

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