move-fleet · Defcon MCP: Risk & Policy

WHAT IT DOES

What move-fleet does on Defcon

AI agents invoke move-fleet to trigger actions in Defcon. 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 move-fleet needs a policy

This tool triggers an in-game action (moving a fleet) that changes the game state. It is an Execute-category operation as it issues a command to an external system (the DEFCON game engine) whose effects depend on the provided coordinates. It is not Destructive in the real-world sense, as it only affects a game simulation, keeping severity at medium.

From the tool's definition Moves all ships in a fleet to the specified coordinates

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

move-fleet Rate-limited

move-fleet 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": {
    "move-fleet": {
      "limits": [
        {
          "counter": "move-fleet_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 Defcon, so you can run agents against it safely.

FAQ

Questions about move-fleet

What does the move-fleet tool do? +

Moves all ships in a fleet to the specified coordinates. IMPORTANT: Check the response to verify if the command was successful!. It is categorised as a Execute tool in the Defcon MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on move-fleet? +

Register the Defcon MCP server in PolicyLayer and add a rule for move-fleet: 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 Defcon. Nothing to install.

What risk level is move-fleet? +

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

Can I rate-limit move-fleet? +

Yes. Add a rate_limit block to the move-fleet 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 move-fleet completely? +

Set action: deny in the PolicyLayer policy for move-fleet. 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 move-fleet? +

move-fleet is provided by the Defcon MCP server (jorisvddonk/defcon-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.