Get all lists a particular email address is subscribed to for a client
AI agents call get_lists_for_email 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 queries subscription information for an email address without creating, modifying, or deleting any data. It is a read-only operation that retrieves existing information from the Campaign Monitor API. The blast radius of misuse is limited to unauthorized information disclosure about subscription lists, which is a low-severity concern compared to tools that modify data or trigger external operations.
From the tool's definition Tool name 'get_lists_for_email' and description 'Get all lists a particular email address is subscribed to' indicates data retrieval with the verb 'Get' and no modification of state.
Attacks that exploit this kind of access
Get all lists a particular email address is subscribed to for a client. 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_lists_for_email: 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_lists_for_email 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_lists_for_email 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_lists_for_email. 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_lists_for_email 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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