AI agents use create_search_theme_signal 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.
The 'create_' prefix strongly indicates a Write operation (reversible creation/modification). Tool description is empty, which reduces confidence slightly, but the naming pattern and server context (Google Ads management) make it clear this creates a new resource rather than reading, deleting, or executing arbitrary operations.
From the tool's definition Tool name 'create_search_theme_signal' indicates creation of data. Server description states the MCP wraps Google Ads API v20 for managing campaigns, budgets, keywords, conversions, and running searches.
Documented attack patterns abuse exactly the kind of access create_search_theme_signal 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_search_theme_signal:
{
"version": "1",
"default": "deny",
"tools": {
"create_search_theme_signal": {
"limits": [
{
"counter": "create_search_theme_signal_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}create_search_theme_signal 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_search_theme_signal. 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_search_theme_signal: 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_search_theme_signal 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_search_theme_signal 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_search_theme_signal. 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_search_theme_signal 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.