Get a paginated list of subscribers who unsubscribed via a campaign
AI agents call get_campaign_unsubscribes 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 historical unsubscribe data from a campaign without modifying, deleting, or executing any changes to the system. It is a straightforward query operation that returns information about subscribers who have unsubscribed. While it accesses potentially sensitive subscriber data, the Read category is appropriate because there are no side effects—the data is merely queried.
From the tool's definition Tool name 'get_campaign_unsubscribes' and description 'Get a paginated list of subscribers' indicate a retrieval operation. The verb 'Get' and 'list' are explicit Read operations with no modification or deletion.
Attacks that exploit this kind of access
Get a paginated list of subscribers who unsubscribed via a campaign. 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_campaign_unsubscribes: 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_campaign_unsubscribes 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_campaign_unsubscribes 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_campaign_unsubscribes. 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_campaign_unsubscribes 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.
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Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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