export_to_csv · Excel MCP Server MCP: Risk & Policy

WHAT IT DOES

What export_to_csv does on Excel MCP Server

AI agents use export_to_csv 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 export_to_csv needs a policy

Exporting data to CSV creates a new file or overwrites an existing one, which is a write operation. While not destructive (the original worksheet remains), it does create/modify file system state. Severity is medium because unintended CSV exports could expose sensitive spreadsheet data to unintended locations or formats, but the operation is reversible (the file can be deleted).

From the tool's definition Tool name 'export_to_csv' and description 'ワークシートをCSVファイルにエクスポート' (export worksheet to CSV file) indicates creation of a new file/data output.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

export_to_csv Rate-limited

export_to_csv 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": {
    "export_to_csv": {
      "limits": [
        {
          "counter": "export_to_csv_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 export_to_csv

What does the export_to_csv tool do? +

ワークシートをCSVファイルにエクスポートします. 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 export_to_csv? +

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

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

Can I rate-limit export_to_csv? +

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

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

export_to_csv is provided by the Excel MCP Server MCP server (superpyonchix/excel_mcp_server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.