Updates fields on an existing Automated Rule. Partial
AI agents use meta_ads_ad_rules_update to create or update resources in Mureo — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Mureo environment.
The tool updates fields on automated advertising rules in Meta Ads, which affects ad campaign behavior and spending. While reversible (Write rather than Destructive), the blast radius is high because misconfigured ad rules can cause unintended budget spend, targeting changes, or campaign disruptions.
From the tool's definition Tool name contains 'update' and description states 'Updates fields on an existing Automated Rule.' This modifies existing configuration reversibly.
Documented attack patterns abuse exactly the kind of access meta_ads_ad_rules_update gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Mureo, and nothing reaches the server without passing your rules. This is the rule we recommend for meta_ads_ad_rules_update:
{
"version": "1",
"default": "deny",
"tools": {
"meta_ads_ad_rules_update": {
"limits": [
{
"counter": "meta_ads_ad_rules_update_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}meta_ads_ad_rules_update 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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Updates fields on an existing Automated Rule. Partial. It is categorised as a Write tool in the Mureo MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Mureo MCP server in PolicyLayer and add a rule for meta_ads_ad_rules_update: 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 Mureo. Nothing to install.
meta_ads_ad_rules_update 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 meta_ads_ad_rules_update 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 meta_ads_ad_rules_update. 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.
meta_ads_ad_rules_update is provided by the Mureo MCP server (logly/mureo). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Mureo, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
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