excel_create_npv_analysis · Excel Finance MCP: Risk & Policy

WHAT IT DOES

What excel_create_npv_analysis does on Excel Finance MCP

AI agents use excel_create_npv_analysis to create or update resources in Excel Finance MCP — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Excel Finance MCP environment.

WHY IT NEEDS A POLICY

Why excel_create_npv_analysis needs a policy

This tool creates a new Excel worksheet with NPV (Net Present Value) analysis formulas and documentation. While it operates in a financial context, the actual action is creating/writing structured data (formulas and documentation in a spreadsheet) rather than moving money or executing arbitrary code. The Write category applies because it creates reversible content.

From the tool's definition Tool name includes 'create' and description states 'Create a comprehensive NPV analysis worksheet with formulas and documentation', indicating data creation and modification.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

excel_create_npv_analysis Rate-limited

excel_create_npv_analysis stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "excel_create_npv_analysis": {
      "limits": [
        {
          "counter": "excel_create_npv_analysis_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Excel Finance MCP, so you can run agents against it safely.

FAQ

Questions about excel_create_npv_analysis

What does the excel_create_npv_analysis tool do? +

Create a comprehensive NPV analysis worksheet with formulas and documentation. It is categorised as a Write tool in the Excel Finance MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on excel_create_npv_analysis? +

Register the Excel Finance MCP server in PolicyLayer and add a rule for excel_create_npv_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 Finance MCP. Nothing to install.

What risk level is excel_create_npv_analysis? +

excel_create_npv_analysis is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit excel_create_npv_analysis? +

Yes. Add a rate_limit block to the excel_create_npv_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 excel_create_npv_analysis completely? +

Set action: deny in the PolicyLayer policy for excel_create_npv_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 excel_create_npv_analysis? +

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