interest_payments

THE RISK

Low Risk

Why interest_payments needs a policy

This tool retrieves and queries historical interest payment records from a cash management account. It performs a read-only operation with no side effects—no data is created, modified, deleted, or financial transactions are executed.

From the tool's definition Tool name 'interest_payments' and description 'Gets interest payment history from cash management' indicate retrieval of historical financial data without modification or execution capabilities.

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

POLICY

How to control interest_payments

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

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "interest_payments": {}
  }
}

interest_payments is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

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

CAP THIS TOOL →

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EXPLORE

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
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FAQ

Questions about interest_payments

What does the interest_payments tool do? +

Gets interest payment history from cash management. It is categorised as a Read tool in the Open Stocks MCP MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on interest_payments? +

Register the Open Stocks MCP server in PolicyLayer and add a rule for interest_payments: 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 Open Stocks MCP. Nothing to install.

What risk level is interest_payments? +

interest_payments is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit interest_payments? +

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

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

interest_payments is provided by the Open Stocks MCP server (open-agent-tools/open-stocks-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Open Stocks MCP tool call.

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

CHECK YOUR STACK →