rename_file · Omni Fs MCP: Risk & Policy

WHAT IT DOES

What rename_file does on Omni Fs

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

WHY IT NEEDS A POLICY

Why rename_file needs a policy

Renaming or moving a file modifies file system state but is reversible—it does not delete data irreversibly (which would be Destructive) nor execute arbitrary code (Execute). This is a classic Write operation.

From the tool's definition Tool name 'rename_file' and description 'Rename or move a file within a backend' indicate reversible modification of file metadata/location. The operation can be undone by renaming/moving back.

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 Omni Fs, so you can run agents against it safely.

FAQ

Questions about rename_file

What does the rename_file tool do? +

Rename or move a file within a backend. It is categorised as a Write tool in the Omni Fs 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 Omni Fs 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 Omni Fs. 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 Omni Fs MCP server (vaayne/omni-fs-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.