create_excel_file · Excel MCP Server MCP: Risk & Policy

WHAT IT DOES

What create_excel_file does on Excel MCP Server

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

WHY IT NEEDS A POLICY

Why create_excel_file needs a policy

Creating a new Excel file is a reversible write operation that creates data but does not delete or overwrite existing data irreversibly. Severity is medium because while file creation itself is low-risk, in an agent context it could lead to resource exhaustion or unintended file proliferation if misused repeatedly.

From the tool's definition Tool name 'create_excel_file' and description '创建新的Excel文件' (create new Excel file) indicate file creation. Sibling tools include destructive operations (delete_worksheet) and writes (write_excel_file), confirming this server handles data modification.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_excel_file Rate-limited

create_excel_file 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": {
    "create_excel_file": {
      "limits": [
        {
          "counter": "create_excel_file_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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

FAQ

Questions about create_excel_file

What does the create_excel_file tool do? +

创建新的Excel文件. It is categorised as a Write tool in the Excel MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on create_excel_file? +

Register the Excel MCP Server MCP server in PolicyLayer and add a rule for create_excel_file: 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 create_excel_file? +

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

Can I rate-limit create_excel_file? +

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

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

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