Get a paginated list of unsubscribed subscribers for a list
AI agents call get_unsubscribed_subscribers to retrieve information from Campaign Monitor MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a straightforward data retrieval operation on an existing list of unsubscribed subscribers. It is a read-only query with no capability to modify, delete, or execute operations. The data returned is already filtered to unsubscribed status, so access does not present significant risk even if misused by an AI agent—it merely surfaces information that Campaign Monitor already maintains separately.
From the tool's definition Tool name and description explicitly state "Get a paginated list" with no modification, deletion, or execution capability. Retrieves unsubscribed subscriber data without side effects.
Attacks that exploit this kind of access
Get a paginated list of unsubscribed subscribers for a list. It is categorised as a Read tool in the Campaign Monitor MCP MCP Server, which means it retrieves data without modifying state.
Register the Campaign Monitor MCP server in PolicyLayer and add a rule for get_unsubscribed_subscribers: 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.
get_unsubscribed_subscribers is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the get_unsubscribed_subscribers 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 get_unsubscribed_subscribers. 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.
get_unsubscribed_subscribers 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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