renewFixedBorrow

THE RISK

Critical Risk

Why renewFixedBorrow needs a policy

This tool extends an existing fixed-rate borrow contract, which is a financial commitment. Renewing a borrow contract extends financial obligations (interest payments, collateral requirements) on a cryptocurrency exchange. This falls squarely in the Financial category as it modifies active financial/lending agreements with monetary consequences.

From the tool's definition Renew (extend) an existing fixed-rate borrow contract — commits to extending a financial borrowing obligation on the Bybit exchange

Documented attack patterns abuse exactly the kind of access renewFixedBorrow gives an agent:

POLICY

How to control renewFixedBorrow

PolicyLayer is an MCP gateway — it sits between your AI agents and Bybit MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for renewFixedBorrow:

policy.json

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

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

Create a free account and register Bybit MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

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EXPLORE

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Go deeper

Critical-risk tools in Bybit MCP Server → Every critical-risk tool this server exposes, in one view.
All critical-risk MCP tools → Every critical-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Human-in-the-loop → When a tool call should wait for a person — and when policy can decide alone.
Tool call approval → Approval gates on individual tool calls: auto-allow, prompt, or deny.
How to Add Spending Controls to Any MCP Agent →
Rate Limiting MCP Tool Calls: A Practical Guide →

FAQ

Questions about renewFixedBorrow

What does the renewFixedBorrow tool do? +

Renew (extend) an existing fixed-rate borrow contract.\n\nRules:\n- The contract must have prepayment amount available (. It is categorised as a Financial tool in the Bybit MCP Server MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on renewFixedBorrow? +

Register the Bybit MCP Server MCP server in PolicyLayer and add a rule for renewFixedBorrow: 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 Bybit MCP Server. Nothing to install.

What risk level is renewFixedBorrow? +

renewFixedBorrow 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 renewFixedBorrow? +

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

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

renewFixedBorrow is provided by the Bybit MCP Server MCP server (bybit-exchange/trading-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Bybit MCP Server tool call.

Start from Bybit MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

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