AI agents call memento_list_active_coercion_rules to retrieve information from Memento without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Although this is a Read operation (information retrieval with no data modification), the severity is high because the rules being listed are 'Active Coercion rules' — rules that enforce goals and shape AI agent behavior. Exposure of these rules could allow an attacker or compromised agent to understand and circumvent enforcement mechanisms designed to prevent harmful autonomous behavior.
From the tool's definition Tool name indicates 'list' operation and description states 'List all deterministic Active Coercion rules currently defined'. The verb 'list' and action of retrieving rule information are query/retrieval operations with no side effects.
Attacks that exploit this kind of access
[DEPRECATED] List all deterministic Active Coercion rules currently defined for the workspace. It is categorised as a Read tool in the Memento MCP Server, which means it retrieves data without modifying state.
Register the Memento MCP server in PolicyLayer and add a rule for memento_list_active_coercion_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 Memento. Nothing to install.
memento_list_active_coercion_rules 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 memento_list_active_coercion_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 memento_list_active_coercion_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.
memento_list_active_coercion_rules is provided by the Memento MCP server (joyciakira/memento). 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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