set_mode · Melo MCP: Risk & Policy

WHAT IT DOES

What set_mode does on Melo

AI agents invoke set_mode 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 set_mode needs a policy

Switching an operating mode triggers an external state change in the Roblox Studio environment, which qualifies as Execute. It's not purely a read, and while it modifies state it's more of a mode/configuration trigger than a data write. Confidence is moderate because the description is sparse and doesn't detail what modes exist or their impact.

From the tool's definition 'Switch the operating mode of Linkedsword' — triggers a mode change in an external system (Linkedsword/Roblox Studio integration)

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

set_mode Rate-limited

set_mode 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": {
    "set_mode": {
      "limits": [
        {
          "counter": "set_mode_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 set_mode

What does the set_mode tool do? +

Switch the operating mode of Linkedsword. -. 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 set_mode? +

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

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

Can I rate-limit set_mode? +

Yes. Add a rate_limit block to the set_mode 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_mode completely? +

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

set_mode 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.