set_active_studio · Melo MCP: Risk & Policy

WHAT IT DOES

What set_active_studio does on Melo

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

WHY IT NEEDS A POLICY

Why set_active_studio needs a policy

This tool changes the active Studio instance, which is a configuration/state change that affects where all subsequent tool calls are directed. It's a Write operation (modifying active session state) rather than Read.

From the tool's definition Switch the active Studio instance. All subsequent tool calls will target this instance.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

set_active_studio Rate-limited

set_active_studio 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": {
    "set_active_studio": {
      "limits": [
        {
          "counter": "set_active_studio_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 Melo, so you can run agents against it safely.

FAQ

Questions about set_active_studio

What does the set_active_studio tool do? +

Switch the active Studio instance. All subsequent tool calls will target this instance. Args: - instanceId (string): The ID of the instance to activate (from list_roblox_studios). It is categorised as a Write tool in the Melo MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on set_active_studio? +

Register the Melo MCP server in PolicyLayer and add a rule for set_active_studio: 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 set_active_studio? +

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

Can I rate-limit set_active_studio? +

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

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

set_active_studio 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.