Get the full hierarchy tree of all GameObjects in the active scene, including their components and children.
AI agents call unity_scene_hierarchy to retrieve information from Unity MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and retrieves the GameObject hierarchy structure from the active Unity scene. It has no side effects—it only reads and returns existing scene data. No objects are created, modified, deleted, or executed. This is a pure information retrieval operation, fitting the 'Read' category.
From the tool's definition Tool name and description indicate retrieval: 'Get the full hierarchy tree' with no mention of modification, deletion, or execution. Returns scene data structure for inspection only.
Documented attack patterns abuse exactly the kind of access unity_scene_hierarchy gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Unity MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for unity_scene_hierarchy:
{
"version": "1",
"default": "deny",
"tools": {
"unity_scene_hierarchy": {}
}
}unity_scene_hierarchy is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get the full hierarchy tree of all GameObjects in the active scene, including their components and children. It is categorised as a Read tool in the Unity MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Unity MCP Server MCP server in PolicyLayer and add a rule for unity_scene_hierarchy: 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 Unity MCP Server. Nothing to install.
unity_scene_hierarchy 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 unity_scene_hierarchy 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 unity_scene_hierarchy. 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.
unity_scene_hierarchy is provided by the Unity MCP Server MCP server (anklebreaker-studio/unity-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 324 Unity MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
324 Unity MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.