calculate_wacc

THE RISK

Low Risk

Why calculate_wacc needs a policy

This tool performs a financial calculation (WACC) using industry data, which is a read-only analytical operation. It retrieves data from the SEC EDGAR database and performs computation to derive a metric, but does not create, modify, delete, or move financial assets.

From the tool's definition Tool name 'calculate_wacc' and description 'Calculate Weighted Average Cost of Capital using industry data' indicates a calculation/analysis operation that retrieves and processes existing financial data without modifying, deleting, or executing external…

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

POLICY

How to control calculate_wacc

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

policy.json

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

calculate_wacc 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 SEC MCP — nothing to install.
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EXPLORE

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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.
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Rate Limiting MCP Tool Calls: A Practical Guide →
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FAQ

Questions about calculate_wacc

What does the calculate_wacc tool do? +

Calculate Weighted Average Cost of Capital using industry data. It is categorised as a Read tool in the SEC MCP MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on calculate_wacc? +

Register the SEC MCP server in PolicyLayer and add a rule for calculate_wacc: 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 SEC MCP. Nothing to install.

What risk level is calculate_wacc? +

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

Can I rate-limit calculate_wacc? +

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

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

calculate_wacc is provided by the SEC MCP server (luisrincon23/sec-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every SEC MCP tool call.

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

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