move_path · Filesystem MCP Server MCP: Risk & Policy

WHAT IT DOES

What move_path does on Filesystem MCP Server

AI agents use move_path 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_path needs a policy

This tool modifies data by changing file/directory locations and names, which is characteristic of Write operations. While the filesystem is altered, the operation is reversible (the item can be moved back). This is less severe than Destructive (which permanently removes data) but more severe than Read.

From the tool's definition The tool description states "Move or rename a file or directory." Moving/renaming are reversible write operations that modify filesystem state without permanent data loss.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

move_path Rate-limited

move_path 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_path": {
      "limits": [
        {
          "counter": "move_path_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_path

What does the move_path tool do? +

Move or rename a file or directory. 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_path? +

Register the Filesystem MCP Server MCP server in PolicyLayer and add a rule for move_path: 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_path? +

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

Can I rate-limit move_path? +

Yes. Add a rate_limit block to the move_path 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_path completely? +

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

move_path is provided by the Filesystem MCP Server MCP server (njbrake/filesystem-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.