AI agents call get_all_users_tools to retrieve information from Memos without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This is a read operation that queries and returns user information without modifying any data. It has medium severity because exposing all user lists could enable reconnaissance or targeting attacks, but it is fundamentally a read-only query with no destructive or financial impact.
From the tool's definition Tool name 'get_all_users_tools' and description '获取所有用户' (get all users) indicate data retrieval with no modification. Retrieves a list of users from the Memos service.
Attacks that exploit this kind of access
获取所有用户. It is categorised as a Read tool in the Memos MCP Server, which means it retrieves data without modifying state.
Register the Memos MCP server in PolicyLayer and add a rule for get_all_users_tools: 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 Memos. Nothing to install.
get_all_users_tools 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_all_users_tools 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_all_users_tools. 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_all_users_tools is provided by the Memos MCP server (yuzhi-jiang/memos-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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