create_line_item

THE RISK

Medium Risk

Why create_line_item needs a policy

This tool creates new line items in Google Ad Manager. Line items are reversible modifications (can be archived or deleted via sibling tools) but represent financial commitments and ad spend allocations. The high severity reflects that misconfigured or unintended line items could commit budget, trigger ad delivery, and cause financial waste.

From the tool's definition Tool name 'create_line_item' and server context showing it manages Google Ad Manager line items, campaigns, and operations.

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

POLICY

How to control create_line_item

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

policy.json

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

create_line_item 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 Google Ad Manager 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 Google Ad Manager MCP Server tools

Execute run_custom_report run_custom_report Execute run_inventory_report run_inventory_report Write associate_creative_with_line_item associate_creative_with_line_item Write duplicate_line_item duplicate_line_item Write find_or_create_advertiser find_or_create_advertiser Write find_or_create_order find_or_create_order Write pause_line_item pause_line_item Write approve_line_item approve_line_item

All 35 Google Ad Manager 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 create_line_item

What does the create_line_item tool do? +

create_line_item. It is categorised as a Write tool in the Google Ad Manager 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_line_item? +

Register the Google Ad Manager MCP Server MCP server in PolicyLayer and add a rule for create_line_item: 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 Google Ad Manager MCP Server. Nothing to install.

What risk level is create_line_item? +

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

Can I rate-limit create_line_item? +

Yes. Add a rate_limit block to the create_line_item 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_line_item completely? +

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

create_line_item is provided by the Google Ad Manager MCP Server MCP server (matiouscorp/google-ad-manager-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Google Ad Manager MCP Server tool call.

Start from Google Ad Manager 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 →