save_asset · Unreal MCP: Risk & Policy

WHAT IT DOES

What save_asset does on Unreal

AI agents use save_asset 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 save_asset needs a policy

The tool modifies and persists asset state within Unreal Engine's project files. While save operations are reversible (existing saved versions can be restored or changes undone), they alter the project state and commit changes to disk. This is a Write action rather than Destructive since the asset itself is not deleted or irreversibly corrupted, and backups/version control may exist.

From the tool's definition Tool name 'save_asset' and description 'Force save a specific asset' indicate the tool persists data modifications to asset files.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

save_asset Rate-limited

save_asset 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": {
    "save_asset": {
      "limits": [
        {
          "counter": "save_asset_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 save_asset

What does the save_asset tool do? +

Force save a specific asset. 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 save_asset? +

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

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

Can I rate-limit save_asset? +

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

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

save_asset 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.