excel_autofit_columns · Excel Finance MCP: Risk & Policy

WHAT IT DOES

What excel_autofit_columns does on Excel Finance MCP

AI agents use excel_autofit_columns 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_autofit_columns needs a policy

This tool modifies column width metadata in an Excel workbook, which is a reversible write operation. It does not create/delete data, execute external code, or trigger financial transactions. The change is cosmetic/formatting only and can be easily undone, making it a low-severity Write action.

From the tool's definition Tool name 'excel_autofit_columns' and description 'Auto-fit column widths based on content with min/max constraints' indicate modification of Excel worksheet formatting properties.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

excel_autofit_columns Rate-limited

excel_autofit_columns 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_autofit_columns": {
      "limits": [
        {
          "counter": "excel_autofit_columns_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_autofit_columns

What does the excel_autofit_columns tool do? +

Auto-fit column widths based on content with min/max constraints. 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_autofit_columns? +

Register the Excel Finance MCP server in PolicyLayer and add a rule for excel_autofit_columns: 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_autofit_columns? +

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

Can I rate-limit excel_autofit_columns? +

Yes. Add a rate_limit block to the excel_autofit_columns 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_autofit_columns completely? +

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

excel_autofit_columns 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.