move_file · LocalFS MCP Server MCP: Risk & Policy

WHAT IT DOES

What move_file does on LocalFS MCP Server

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

WHY IT NEEDS A POLICY

Why move_file needs a policy

Move/rename operations are reversible if the source location is recoverable and no overwrites occur, placing this in Write rather than Destructive. However, the risk is medium rather than low because: (1) overwriting a destination file is a plausible default behavior that destroys the original file at that location, and (2) careless use could corrupt application state if critical files are moved to wrong locations.

From the tool's definition Tool description states 'Move or rename a file from source to destination path.' Moving/renaming files modifies their metadata and location but does not delete the file content.

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 LocalFS MCP Server, so you can run agents against it safely.

FAQ

Questions about move_file

What does the move_file tool do? +

Move or rename a file from source to destination path. It is categorised as a Write tool in the LocalFS 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 LocalFS 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 LocalFS 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 LocalFS MCP Server MCP server (mcp-bridge/local-filesystem). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.