rename_file · Mail Cal Drive MCP: Risk & Policy

WHAT IT DOES

What rename_file does on Mail Cal Drive

AI agents use rename_file to create or update resources in Mail Cal Drive — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Mail Cal Drive environment.

WHY IT NEEDS A POLICY

Why rename_file needs a policy

Renaming a file is a reversible Write operation. An AI agent with misdirected intent could rename critical files to cause confusion or break application logic (e.g., renaming config files, documents, or attachments in a business context), but the action remains reversible via a second rename.

From the tool's definition Tool name is 'rename_file' with description 'Rename a file'. Renaming modifies file metadata/state but does not delete or destroy the file itself, nor does it execute code or access financial systems.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

rename_file Rate-limited

rename_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": {
    "rename_file": {
      "limits": [
        {
          "counter": "rename_file_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 Mail Cal Drive, so you can run agents against it safely.

FAQ

Questions about rename_file

What does the rename_file tool do? +

Rename a file. It is categorised as a Write tool in the Mail Cal Drive MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on rename_file? +

Register the Mail Cal Drive MCP server in PolicyLayer and add a rule for rename_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 Mail Cal Drive. Nothing to install.

What risk level is rename_file? +

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

Can I rate-limit rename_file? +

Yes. Add a rate_limit block to the rename_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 rename_file completely? +

Set action: deny in the PolicyLayer policy for rename_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 rename_file? +

rename_file is provided by the Mail Cal Drive MCP server (rumbitopi/mail-cal-drive-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.