validate_assets · Unreal MCP: Risk & Policy

WHAT IT DOES

What validate_assets does on Unreal

AI agents invoke validate_assets to trigger actions in Unreal. 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 validate_assets needs a policy

The tool actively runs/executes a validation process against assets in a directory. While validation is typically read-like in intent, 'running' a validation process in Unreal Engine may trigger plugin logic, modify asset metadata, or produce side effects depending on implementation. It is more than a simple read/query operation, placing it in Execute.

From the tool's definition 'Run data validation on assets in a directory' — 'Run' indicates active execution of a validation process

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

validate_assets Rate-limited

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

FAQ

Questions about validate_assets

What does the validate_assets tool do? +

Run data validation on assets in a directory. It is categorised as a Execute tool in the Unreal MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on validate_assets? +

Register the Unreal MCP server in PolicyLayer and add a rule for validate_assets: 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 validate_assets? +

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

Can I rate-limit validate_assets? +

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

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

validate_assets 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.