rollback · Melo MCP: Risk & Policy

WHAT IT DOES

What rollback does on Melo

AI agents invoke rollback to trigger actions in Melo. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why rollback needs a policy

This tool triggers undo operations in Roblox Studio, reversing up to 50 previous actions. While it is conceptually a recovery action, it actively executes state changes in the development environment — potentially undoing significant work including transaction-safe batch operations, script edits, or instance manipulations.

From the tool's definition "Trigger undo in Studio to rollback the last N operations" with up to 50 undo steps

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

rollback Rate-limited

rollback stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "rollback": {
      "limits": [
        {
          "counter": "rollback_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Melo, so you can run agents against it safely.

FAQ

Questions about rollback

What does the rollback tool do? +

Trigger undo in Studio to rollback the last N operations. Args: - count (number, optional): Number of undo steps (default: 1, max: 50) Returns: Confirmation of rollback. It is categorised as a Execute tool in the Melo MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on rollback? +

Register the Melo MCP server in PolicyLayer and add a rule for rollback: 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 Melo. Nothing to install.

What risk level is rollback? +

rollback is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit rollback? +

Yes. Add a rate_limit block to the rollback 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 rollback completely? +

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

rollback is provided by the Melo MCP server (yannyhl/linkedsword-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.