vault_borrow · Basis MCP Server MCP: Risk & Policy

WHAT IT DOES

What vault_borrow does on Basis MCP Server

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

WHY IT NEEDS A POLICY

Why vault_borrow needs a policy

This tool initiates a borrowing/lending transaction on-chain, creating a financial liability with ongoing interest charges. Misuse could result in over-leveraging, liquidation risk, or loss of collateral (wSTASIS). This is a direct financial commitment with real monetary consequences.

From the tool's definition 'Borrow USDB against locked wSTASIS. 2% + 0.005%/day.' — commits a financial obligation (loan with interest rate) using collateral

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

vault_borrow Approval-gated

Any call to vault_borrow 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": {
    "vault_borrow": {
      "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 Basis MCP Server, so you can run agents against it safely.

FAQ

Questions about vault_borrow

What does the vault_borrow tool do? +

Borrow USDB against locked wSTASIS. 2% + 0.005%/day. It is categorised as a Financial tool in the Basis MCP Server MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on vault_borrow? +

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

What risk level is vault_borrow? +

vault_borrow 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 vault_borrow? +

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

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

vault_borrow is provided by the Basis MCP Server MCP server (launch-on-basis/mcp-ts). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.