supply · Justlend MCP: Risk & Policy

WHAT IT DOES

What supply does on Justlend

AI agents use supply 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 supply needs a policy

This tool moves real financial assets (crypto tokens) into a lending protocol on the TRON blockchain. Depositing assets into a DeFi market is a financial operation that commits funds and exposes them to smart contract risk, interest rate fluctuations, and potential liquidation. The broader server context (lending, borrowing, portfolio management on JustLend DAO) confirms this is a financial transaction tool.

From the tool's definition Supply (deposit) assets into a JustLend market to earn interest

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

supply Approval-gated

Any call to supply 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": {
    "supply": {
      "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 supply

What does the supply tool do? +

Supply (deposit) assets into a JustLend market to earn interest. 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 supply? +

Register the Justlend MCP server in PolicyLayer and add a rule for supply: 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 supply? +

supply 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 supply? +

Yes. Add a rate_limit block to the supply 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 supply completely? +

Set action: deny in the PolicyLayer policy for supply. 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 supply? +

supply 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.