rent_energy · Justlend MCP: Risk & Policy

WHAT IT DOES

What rent_energy does on Justlend

AI agents use rent_energy to commit financial operations through Justlend — usually the final step of a payment, billing, or trading workflow. A call moves real money.

WHY IT NEEDS A POLICY

Why rent_energy needs a policy

Renting energy from JustLend involves a financial transaction on the TRON blockchain — it commits TRX resources/funds to pay for energy rental. This is a financial commitment that moves or locks assets, making it a Financial category action with high severity since an AI agent could misuse it to spend user funds on energy rentals for arbitrary addresses.

From the tool's definition Rent energy from JustLend for a specified receiver address

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

rent_energy Approval-gated

Any call to rent_energy is blocked until a human approves it. The rest of the server keeps working.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "rent_energy": {
      "deny_if": [
        {
          "conditions": [],
          "on_deny": "Requires human approval."
        }
      ]
    }
  }
}

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PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Justlend, so you can run agents against it safely.

FAQ

Questions about rent_energy

What does the rent_energy tool do? +

Rent energy from JustLend for a specified receiver address. It is categorised as a Financial tool in the Justlend MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on rent_energy? +

Register the Justlend MCP server in PolicyLayer and add a rule for rent_energy: 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.

What risk level is rent_energy? +

rent_energy is a Financial tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.

Can I rate-limit rent_energy? +

Yes. Add a rate_limit block to the rent_energy 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.

How do I block rent_energy completely? +

Set action: deny in the PolicyLayer policy for rent_energy. 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.

What MCP server provides rent_energy? +

rent_energy 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.