rename_file_or_folder · TypeScript Tools MCP: Risk & Policy

WHAT IT DOES

What rename_file_or_folder does on TypeScript Tools MCP

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

WHY IT NEEDS A POLICY

Why rename_file_or_folder needs a policy

This tool modifies both file system structure (via rename) and source code (via automatic import/export path updates). While reversible (files can be renamed back), the cascading nature and potential to affect many files across a codebase makes it a high-severity Write operation.

From the tool's definition The tool description explicitly states it renames files/folders and "automatically update[s] all import/export paths that reference it." Renaming is a modification operation; the automatic cascading updates across multiple files amplify the scope of change.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

rename_file_or_folder Rate-limited

rename_file_or_folder 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_or_folder": {
      "limits": [
        {
          "counter": "rename_file_or_folder_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 TypeScript Tools MCP, so you can run agents against it safely.

FAQ

Questions about rename_file_or_folder

What does the rename_file_or_folder tool do? +

Rename a file or folder and automatically update all import/export paths that reference it. It is categorised as a Write tool in the TypeScript Tools 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 rename_file_or_folder? +

Register the TypeScript Tools MCP server in PolicyLayer and add a rule for rename_file_or_folder: 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 TypeScript Tools MCP. Nothing to install.

What risk level is rename_file_or_folder? +

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

Can I rate-limit rename_file_or_folder? +

Yes. Add a rate_limit block to the rename_file_or_folder 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_or_folder completely? +

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

rename_file_or_folder is provided by the TypeScript Tools MCP server (trkbt10/mcp-typescript-tools). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.