list_actors
List all actors in the current level, optionally filtered by class.
This record as markdown: /tools/jjpxdev-unreal-mcp/list-actors.md
What list_actors does on Unreal
AI agents call list_actors to retrieve information from Unreal without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
| Parameter | Type | Required | Description |
|---|---|---|---|
name_filter | string | — | Filter by name substring |
class_filter | string | — | Filter by actor class (e.g., StaticMeshActor, PointLight) |
Parameters from the server's own tool schema.
Why list_actors is rated Low
This tool retrieves and filters existing actor data from the Unreal Engine level without creating, modifying, deleting, or executing anything. It is a straightforward inventory/discovery operation typical of Read category tools. Low severity because listing actors poses minimal risk even if accessed by an untrusted agent, though it may reveal level design or actor configuration details.
From the tool's definition Tool description states 'List all actors in the current level, optionally filtered by class' — a pure query/retrieval operation with no modification, deletion, or execution side effects.
Attacks that exploit this kind of access
The rule that runs list_actors safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Unreal, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For list_actors, this is the rule to start with:
list_actors is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect Unreal, apply this rule, and every list_actors call is checked against it from then on.
Questions about list_actors
List all actors in the current level, optionally filtered by class. It is categorised as a Read tool in the Unreal MCP Server, which means it retrieves data without modifying state.
list_actors accepts 2 parameters: name_filter, class_filter. The full parameter table on this page comes from the server's own tool schema.
Register the Unreal MCP server in PolicyLayer and add a rule for list_actors: 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.
list_actors 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 list_actors 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 list_actors. 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.
list_actors is provided by the Unreal MCP server (@jjpxdev/unreal-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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