restore-file-version · Nextcloud MCP: Risk & Policy

WHAT IT DOES

What restore-file-version does on Nextcloud

AI agents use restore-file-version to create or update resources in Nextcloud — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Nextcloud environment.

WHY IT NEEDS A POLICY

Why restore-file-version needs a policy

This tool creates or modifies data reversibly. Restoring a previous file version overwrites the current file content, which is a Write operation. The severity is medium because while the action is reversible (the current version typically remains in history), an agent could misuse this to restore outdated or malicious versions of critical files, potentially causing data integrity issues or service disruption.

From the tool's definition restore-file-version: tool restores a specific version of a file, which modifies the current state of the file by overwriting it with a previous version.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

restore-file-version Rate-limited

restore-file-version 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": {
    "restore-file-version": {
      "limits": [
        {
          "counter": "restore-file-version_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 Nextcloud, so you can run agents against it safely.

FAQ

Questions about restore-file-version

What does the restore-file-version tool do? +

Restore a specific version of a file. It is categorised as a Write tool in the Nextcloud MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on restore-file-version? +

Register the Nextcloud MCP server in PolicyLayer and add a rule for restore-file-version: 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 Nextcloud. Nothing to install.

What risk level is restore-file-version? +

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

Can I rate-limit restore-file-version? +

Yes. Add a rate_limit block to the restore-file-version 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 restore-file-version completely? +

Set action: deny in the PolicyLayer policy for restore-file-version. 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 restore-file-version? +

restore-file-version is provided by the Nextcloud MCP server (nextcloud-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.