add_actor_binding · Unreal MCP: Risk & Policy

WHAT IT DOES

What add_actor_binding does on Unreal

AI agents use add_actor_binding 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 add_actor_binding needs a policy

The tool creates or modifies metadata (actor bindings) in a level sequence, which is a Write operation. The severity is medium because while the change is reversible and confined to animation bindings (not destructive), misuse could corrupt animation sequences or create unintended bindings that require manual cleanup. The blast radius is limited to animation/sequencing systems rather than core gameplay or assets.

From the tool's definition Tool name 'add_actor_binding' and description 'Bind an actor to a level sequence for animation' indicate creating/modifying a binding relationship between an actor and a level sequence.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

add_actor_binding Rate-limited

add_actor_binding 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": {
    "add_actor_binding": {
      "limits": [
        {
          "counter": "add_actor_binding_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 add_actor_binding

What does the add_actor_binding tool do? +

Bind an actor to a level sequence for animation. 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 add_actor_binding? +

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

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

Can I rate-limit add_actor_binding? +

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

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

add_actor_binding 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.