AI agents call list_categories to retrieve information from Memoraeu without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and lists existing categories sorted by usage frequency. It performs a read-only operation that queries data without creating, modifying, deleting, or executing any operations. The memory system is client-side encrypted, and listing categories poses minimal security risk as it only exposes metadata about category organization.
From the tool's definition Tool name 'list_categories' and description 'Retourne les catégories existantes triées par usage' (Returns existing categories sorted by usage) indicate a retrieval/query operation with no data modification.
Attacks that exploit this kind of access
Retourne les catégories existantes triées par usage. It is categorised as a Read tool in the Memoraeu MCP Server, which means it retrieves data without modifying state.
Register the Memoraeu MCP server in PolicyLayer and add a rule for list_categories: 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 Memoraeu. Nothing to install.
list_categories 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 list_categories 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 list_categories. 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.
list_categories is provided by the Memoraeu MCP server (pquattro/memoraeu-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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