ratio_analysis

THE RISK

Low Risk

Why ratio_analysis needs a policy

This tool reads financial data and performs calculations to generate ratio metrics for comparison against benchmarks. It produces insights through analysis without side effects such as data modification, deletion, or execution of external code/commands.

From the tool's definition Tool performs 'comprehensive financial ratio analysis with industry benchmarks' - a computational analysis operation that calculates and compares ratios without modifying, deleting, or executing external operations.

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

POLICY

How to control ratio_analysis

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

policy.json

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

ratio_analysis 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 Excel 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

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 →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about ratio_analysis

What does the ratio_analysis tool do? +

Perform comprehensive financial ratio analysis with industry benchmarks. It is categorised as a Read tool in the Excel MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on ratio_analysis? +

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

What risk level is ratio_analysis? +

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

Can I rate-limit ratio_analysis? +

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

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

ratio_analysis is provided by the Excel MCP Server MCP server (ishayoyo/excel-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Excel MCP Server tool call.

Start from Excel 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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