AI agents call editor_list_assets to retrieve information from Unreal without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs asset enumeration/discovery in an Unreal Editor context. It retrieves and displays information about assets without creating, modifying, deleting, or executing any operations. The verb 'List' and the read-only nature of asset inventory queries classify this as a Read operation.
From the tool's definition Tool name is 'editor_list_assets' and description states 'List all Unreal assets' — a retrieval/query operation with no modification or execution side effects.
Documented attack patterns abuse exactly the kind of access editor_list_assets gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Unreal, and nothing reaches the server without passing your rules. This is the rule we recommend for editor_list_assets:
{
"version": "1",
"default": "deny",
"tools": {
"editor_list_assets": {}
}
}editor_list_assets is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List all Unreal assets\n\nExample output: [. It is categorised as a Read tool in the Unreal MCP Server, which means it retrieves data without modifying state.
Register the Unreal MCP server in PolicyLayer and add a rule for editor_list_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.
editor_list_assets is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the editor_list_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.
Set action: deny in the PolicyLayer policy for editor_list_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.
editor_list_assets is provided by the Unreal MCP server (runreal/unreal-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 20 Unreal tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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20 Unreal tools catalogued and risk-classified — across an index of 42,500+ MCP servers.