place-structure · Defcon MCP: Risk & Policy

WHAT IT DOES

What place-structure does on Defcon

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

WHY IT NEEDS A POLICY

Why place-structure needs a policy

This tool creates/places game objects (structures) at specified locations within the DEFCON game. It is a Write operation as it modifies game state by adding structures. While it involves military assets like Silos, this is within a game simulation context. Severity is medium because misplacement could waste in-game resources or alter strategy significantly, but effects are confined to the game environment.

From the tool's definition Places a military structure (Silo, RadarStation, or AirBase) at the specified coordinates

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

place-structure Rate-limited

place-structure 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": {
    "place-structure": {
      "limits": [
        {
          "counter": "place-structure_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 Defcon, so you can run agents against it safely.

FAQ

Questions about place-structure

What does the place-structure tool do? +

Places a military structure (Silo, RadarStation, or AirBase) at the specified coordinates. IMPORTANT: Check the response to verify if placement was successful!. It is categorised as a Write tool in the Defcon MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on place-structure? +

Register the Defcon MCP server in PolicyLayer and add a rule for place-structure: 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 place-structure? +

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

Can I rate-limit place-structure? +

Yes. Add a rate_limit block to the place-structure 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 place-structure completely? +

Set action: deny in the PolicyLayer policy for place-structure. 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 place-structure? +

place-structure 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.