AI agents use create_merchant_center_link to create or update resources in Google Ads — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Google Ads environment.
This tool creates a new integration link between Google Ads and Merchant Center, which modifies account configuration. It is reversible (links can be removed), so it falls under Write rather than Destructive. The severity is medium because misconfiguration could affect product visibility in ads campaigns, but does not directly result in financial loss or data deletion.
From the tool's definition Tool name is 'create_merchant_center_link' and description states it will 'Create a Merchant Center product link.' The verb 'create' indicates creation of a new resource/link that is reversible (can be deleted or unlinked).
Documented attack patterns abuse exactly the kind of access create_merchant_center_link gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Google Ads, and nothing reaches the server without passing your rules. This is the rule we recommend for create_merchant_center_link:
{
"version": "1",
"default": "deny",
"tools": {
"create_merchant_center_link": {
"limits": [
{
"counter": "create_merchant_center_link_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}create_merchant_center_link 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.
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Create a Merchant Center product link. It is categorised as a Write tool in the Google Ads MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Google Ads MCP server in PolicyLayer and add a rule for create_merchant_center_link: 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 Ads. Nothing to install.
create_merchant_center_link is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the create_merchant_center_link 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.
Set action: deny in the PolicyLayer policy for create_merchant_center_link. 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.
create_merchant_center_link is provided by the Google Ads MCP server (promobase/google-ads-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Google Ads, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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59 Google Ads tools catalogued and risk-classified — across an index of 43,000+ MCP servers.