excel_merge_files · Excel Finance MCP: Risk & Policy

WHAT IT DOES

What excel_merge_files does on Excel Finance MCP

AI agents use excel_merge_files 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_merge_files needs a policy

This tool modifies data by combining multiple Excel files into a single workbook. It creates a new composite workbook, which is a reversible write operation (the original files remain unchanged and the merged result can be deleted or recreated).

From the tool's definition Merge multiple Excel files into one workbook

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

excel_merge_files Rate-limited

excel_merge_files 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_merge_files": {
      "limits": [
        {
          "counter": "excel_merge_files_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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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_merge_files

What does the excel_merge_files tool do? +

Merge multiple Excel files into one workbook. 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_merge_files? +

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

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

Can I rate-limit excel_merge_files? +

Yes. Add a rate_limit block to the excel_merge_files 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_merge_files completely? +

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

excel_merge_files 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.