Remove all rules from a segment
AI agents call clear_segment_rules to permanently remove resources in Campaign Monitor MCP — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
Clearing all rules from a segment is an irreversible bulk deletion of configuration data. Once all rules are removed, the segment logic is destroyed and cannot be automatically recovered. This could affect targeting for campaigns, journeys, and subscriber management at scale.
From the tool's definition Remove all rules from a segment
Attacks that exploit this kind of access
Remove all rules from a segment. It is categorised as a Destructive tool in the Campaign Monitor MCP MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Campaign Monitor MCP server in PolicyLayer and add a rule for clear_segment_rules: 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 Campaign Monitor MCP. Nothing to install.
clear_segment_rules is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the clear_segment_rules 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 clear_segment_rules. 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.
clear_segment_rules is provided by the Campaign Monitor MCP server (pauliowest/cmon-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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