repay

Repay borrowed assets to a JustLend market.

SERVERJustlend SOURCEjustlend/mcp-server-justlend

Critical RISK CLASS

Category Financial

Parameters 00 required

Recommended Approval-gatedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/justlend-mcp-server-justlend/repay.md

WHAT IT DOES

What repay does on Justlend

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

RISK

Why repay is rated Critical

This tool moves crypto assets on a DeFi lending protocol (JustLend DAO on TRON) to repay debt obligations. It commits financial transactions on-chain, transferring tokens back to the lending market. This directly involves financial operations — repaying borrowed funds — which falls under the Financial category. Misuse could result in unintended asset transfers or manipulation of a user's lending position.

From the tool's definition Repay borrowed assets to a JustLend market

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs repay safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Justlend, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For repay, this is the rule to start with:

repay Approval-gated

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

GATE THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Justlend, apply this rule, and every repay call is checked against it from then on.

FAQ

Questions about repay

What does the repay tool do? +

Repay borrowed assets to 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 repay? +

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

repay 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 repay? +

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

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

repay 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.

KEEP EXPLORING

More on Justlend, and thousands of servers like it.

This server

All 104 Justlend tools → Critical-risk tools on this server →

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Guides

Govern MCP payment tools →Human-in-the-loop →Tool call approval →