group_objects · Melo MCP: Risk & Policy

WHAT IT DOES

What group_objects does on Melo

AI agents use group_objects 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 group_objects needs a policy

This tool reorganizes existing instances by placing them under a new container object. It creates a new Model or Folder and modifies the hierarchy, which is a reversible structural change. No data is deleted, no code is executed, and no financial transactions occur.

From the tool's definition Group multiple instances into a container (Model or Folder)

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

group_objects Rate-limited

group_objects 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": {
    "group_objects": {
      "limits": [
        {
          "counter": "group_objects_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 group_objects

What does the group_objects tool do? +

Group multiple instances into a container (Model or Folder). Args: - paths (string[]): Paths to instances to group - containerType (string, optional):. 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 group_objects? +

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

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

Can I rate-limit group_objects? +

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

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

group_objects 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.