set_statetree_schema

What set_statetree_schema does on Unreal-MCP

AI agents use set_statetree_schema to create or update resources in Unreal-MCP, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Unreal-MCP environment.

Why set_statetree_schema is rated Medium

This is classified as Write rather than Destructive because the action is technically reversible—a schema can be changed back to a previous state—though the warning about invalid nodes suggests it causes damage to dependent objects. The severity is high because modifying a StateTree schema in Unreal Engine could break visual scripting logic, invalidate node configurations, and require significant rework.

From the tool's definition Tool description states 'Change the schema of a StateTree' with explicit warning that 'existing nodes may become invalid.' This indicates the tool modifies the structure/definition of a StateTree in a reversible manner (schema can be changed again), but with…

The rule that runs set_statetree_schema safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Unreal-MCP, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For set_statetree_schema, this is the rule to start with:

{
  "version": "1",
  "default": "deny",
  "tools": {
    "set_statetree_schema": {
      "limits": [
        {
          "counter": "set_statetree_schema_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

Questions about set_statetree_schema