Return (cancel) an active energy rental. As a renter, provide the receiver address.
AI agents call return_energy_rental to permanently remove resources in Justlend — 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 return_energy_rental doesn't hesitate, doesn't double-check, and doesn't stop at one. Whatever it removes from Justlend is gone — there is no undo for destructive operations.
Attacks that exploit this kind of access
Return (cancel) an active energy rental. As a renter, provide the receiver address. It is categorised as a Destructive tool in the Justlend MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Justlend MCP server in PolicyLayer and add a rule for return_energy_rental: 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 Justlend. Nothing to install.
return_energy_rental 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 return_energy_rental 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 return_energy_rental. 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.
return_energy_rental is provided by the Justlend MCP server (justlend/mcp-server-justlend). 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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