AI agents call yfy_get_file_info 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 file metadata (name, size, modification date, permissions, etc.) based on a file ID without creating, modifying, or deleting data. It is a read-only query operation.
From the tool's definition Tool name 'yfy_get_file_info' and description 'Get file metadata by file id' indicate retrieval of file metadata without modification or deletion. The phrase 'Uses user-token permissions' confirms access control is in place.
Attacks that exploit this kind of access
Get file metadata by file id. Uses user-token permissions. 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_get_file_info: 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_get_file_info 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_get_file_info 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_get_file_info. 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_get_file_info 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.
Teams ship this data inside their own products. See what a licence covers →