restore_version · Ai Brain MCP: Risk & Policy

WHAT IT DOES

What restore_version does on Ai Brain

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

WHY IT NEEDS A POLICY

Why restore_version needs a policy

This tool modifies existing documents by restoring them to prior versions, which is a reversible write operation. It does not delete data (would be Destructive) but instead creates a new version with restored content. The operation can be undone by restoring to another version.

From the tool's definition Tool description states 'Restore a document to a prior version number' and 'Creates a new version', indicating document modification. Named 'restore_version' which is a write operation that modifies document state by reverting content.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

restore_version Rate-limited

restore_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_version": {
      "limits": [
        {
          "counter": "restore_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 Ai Brain, so you can run agents against it safely.

FAQ

Questions about restore_version

What does the restore_version tool do? +

Restore a document to a prior version number (from list_versions). Creates a new version. It is categorised as a Write tool in the Ai Brain 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_version? +

Register the Ai Brain MCP server in PolicyLayer and add a rule for restore_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 Ai Brain. Nothing to install.

What risk level is restore_version? +

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

Can I rate-limit restore_version? +

Yes. Add a rate_limit block to the restore_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_version completely? +

Set action: deny in the PolicyLayer policy for restore_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_version? +

restore_version is provided by the Ai Brain MCP server (thejoshgriffith/ai-brain). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.