deposit · MCP Banking Server MCP: Risk & Policy

WHAT IT DOES

What deposit does on MCP Banking Server

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

WHY IT NEEDS A POLICY

Why deposit needs a policy

Deposit is a financial operation that transfers money into a bank account. Even though the description is empty, the context is unambiguous: this is a banking server, the tool is named 'deposit', and sibling tools confirm it handles money movement.

From the tool's definition Tool named 'deposit' on a 'production-ready banking server' alongside 'withdraw', 'create_account', and 'get_balance'. The server is explicitly described as providing 'transactions (deposits/withdrawals)' as a core feature.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

deposit Approval-gated

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

FAQ

Questions about deposit

What does the deposit tool do? +

deposit. It is categorised as a Financial tool in the MCP Banking Server MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on deposit? +

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

What risk level is deposit? +

deposit 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 deposit? +

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

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

deposit is provided by the MCP Banking Server MCP server (sksingh2005/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.