AI agents call get_scene_hierarchy to retrieve information from Unity MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and displays the scene hierarchy structure without creating, modifying, deleting, or executing any operations. It is a read-only query operation with no side effects. The low severity reflects that exposure of scene structure data poses minimal risk compared to tools that can execute code (execute_csharp) or manipulate state (enter_playmode, save_scene) on this server.
From the tool's definition Tool name 'get_scene_hierarchy' and description 'Get the complete scene hierarchy' indicates data retrieval. The verb 'Get' and phrase 'Returns a tree structure' confirm it queries and returns existing scene data without modification.
Attacks that exploit this kind of access
Get the complete scene hierarchy with all GameObjects and their components. Returns a tree structure of the active scene. It is categorised as a Read tool in the Unity MCP MCP Server, which means it retrieves data without modifying state.
Register the Unity MCP server in PolicyLayer and add a rule for get_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. Nothing to install.
get_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 get_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 get_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.
get_scene_hierarchy is provided by the Unity MCP server (muammar-yacoob/unity-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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