generate_collision · Unreal MCP: Risk & Policy

WHAT IT DOES

What generate_collision does on Unreal

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

WHY IT NEEDS A POLICY

Why generate_collision needs a policy

This tool creates or modifies collision geometry for static meshes in Unreal Engine, which is a reversible change to asset properties. It does not execute arbitrary code, delete data, or move funds. While it could impact game performance or behavior if misapplied, the effect is reversible through regeneration or removal of collision data.

From the tool's definition Tool name 'generate_collision' and description 'Generate collision for a static mesh' indicates creation/modification of collision data for game assets. This is a write operation that modifies mesh properties.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

generate_collision Rate-limited

generate_collision 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": {
    "generate_collision": {
      "limits": [
        {
          "counter": "generate_collision_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 Unreal, so you can run agents against it safely.

FAQ

Questions about generate_collision

What does the generate_collision tool do? +

Generate collision for a static mesh. It is categorised as a Write tool in the Unreal MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on generate_collision? +

Register the Unreal MCP server in PolicyLayer and add a rule for generate_collision: 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 Unreal. Nothing to install.

What risk level is generate_collision? +

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

Can I rate-limit generate_collision? +

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

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

generate_collision is provided by the Unreal MCP server (sam-david/unreal-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.