move_file · Filesystem MCP Server MCP: Risk & Policy

WHAT IT DOES

What move_file does on Filesystem MCP Server

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

WHY IT NEEDS A POLICY

Why move_file needs a policy

Move operations are reversible—a file can be moved back to its original location. This distinguishes it from Destructive (delete_file). It does not execute code or trigger external operations, ruling out Execute. It modifies filesystem state beyond simple queries, placing it in Write rather than Read.

From the tool's definition Tool named 'move_file' on a filesystem server with sibling tools including 'delete_file' and 'edit_file'. The presence of reversible operations like 'create_file' and 'edit_file' alongside 'move_file' indicates this tool modifies file locations/organization.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

move_file Rate-limited

move_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": {
    "move_file": {
      "limits": [
        {
          "counter": "move_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 Filesystem MCP Server, so you can run agents against it safely.

FAQ

Questions about move_file

What does the move_file tool do? +

move_file. It is categorised as a Write tool in the Filesystem 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 move_file? +

Register the Filesystem MCP Server MCP server in PolicyLayer and add a rule for move_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 Filesystem MCP Server. Nothing to install.

What risk level is move_file? +

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

Can I rate-limit move_file? +

Yes. Add a rate_limit block to the move_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 move_file completely? +

Set action: deny in the PolicyLayer policy for move_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 move_file? +

move_file is provided by the Filesystem MCP Server MCP server (preston-harrison/fs-mcp-py). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.