AI agents call yfy_list_department_users to retrieve information from Yifangyun without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves user information from a department directory within an enterprise cloud system. It performs no creation, modification, deletion, or execution of external operations.
From the tool's definition Tool name 'yfy_list_department_users' and description 'List users in a department' indicate data retrieval with no modification. The note about contact fields being 'excluded unless include_contact is true' confirms this is a query operation.
Attacks that exploit this kind of access
List users in a department using the enterprise token. Contact fields are excluded unless include_contact is true. It is categorised as a Read tool in the Yifangyun MCP Server, which means it retrieves data without modifying state.
Register the Yifangyun MCP server in PolicyLayer and add a rule for yfy_list_department_users: 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 Yifangyun. Nothing to install.
yfy_list_department_users 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 yfy_list_department_users 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 yfy_list_department_users. 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.
yfy_list_department_users is provided by the Yifangyun MCP server (mrhegit/yifangyun-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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