取消训练会话
AI agents call vanna_cancel_training to permanently remove resources in PostGIS Yukon MCP — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
An AI agent that decides to call vanna_cancel_training doesn't hesitate, doesn't double-check, and doesn't stop at one. Whatever it removes from PostGIS Yukon MCP is gone — there is no undo for destructive operations.
Attacks that exploit this kind of access
取消训练会话. It is categorised as a Destructive tool in the PostGIS Yukon MCP MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the PostGIS Yukon MCP server in PolicyLayer and add a rule for vanna_cancel_training: 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 PostGIS Yukon MCP. Nothing to install.
vanna_cancel_training is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the vanna_cancel_training 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 vanna_cancel_training. 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.
vanna_cancel_training is provided by the PostGIS Yukon MCP server (zmgiser/postgis_yukon_mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.