withdraw · Justlend MCP: Risk & Policy

WHAT IT DOES

What withdraw does on Justlend

AI agents use withdraw 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 withdraw needs a policy

This tool moves supplied financial assets (cryptocurrency) out of a DeFi lending market back to the user's wallet. It directly involves financial asset movements on the TRON blockchain via JustLend DAO, making it a Financial category tool. Misuse could result in unauthorized withdrawal of funds, draining of supplied collateral, or triggering liquidation events, hence high severity.

From the tool's definition Withdraw (redeem) supplied assets from a JustLend market

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

withdraw Approval-gated

Any call to withdraw 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": {
    "withdraw": {
      "deny_if": [
        {
          "conditions": [],
          "on_deny": "Requires human approval."
        }
      ]
    }
  }
}

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Instant setup, no code required.

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 withdraw

What does the withdraw tool do? +

Withdraw (redeem) supplied assets from a JustLend market. 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 withdraw? +

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

withdraw 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 withdraw? +

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

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

withdraw 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.