Get a paginated list of active subscribers for a list
AI agents call get_active_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 retrieves and queries subscriber data without modifying, deleting, or executing operations. It has no side effects and follows the 'Read' category pattern of fetching data. Severity is low because exposure of subscriber lists, while sensitive, does not directly enable financial transactions, destructive actions, or code execution.
From the tool's definition Tool name 'get_active_subscribers' and description 'Get a paginated list of active subscribers for a list' indicate data retrieval with pagination. The verb 'Get' and lack of any modification language confirm read-only operation.
Attacks that exploit this kind of access
Get a paginated list of active 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_active_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_active_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_active_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_active_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_active_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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