Get the full hierarchy tree of a prefab asset directly from disk — no scene instance needed. Shows all GameObjects, components, and nested children inside the prefab.
AI agents call unity_prefab_get_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 performs data retrieval of prefab structure metadata without creating, modifying, deleting, or executing any operations. It is purely informational, examining the composition and hierarchy of existing prefab assets. The blast radius of misuse is minimal — an AI agent could only gather information about project structure, not cause harm or alter state.
From the tool's definition Tool description explicitly states 'Get the full hierarchy tree' and 'Shows all GameObjects, components, and nested children' — these are read/retrieval operations with no modification capabilities.
Documented attack patterns abuse exactly the kind of access unity_prefab_get_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_prefab_get_hierarchy:
{
"version": "1",
"default": "deny",
"tools": {
"unity_prefab_get_hierarchy": {}
}
}unity_prefab_get_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 a prefab asset directly from disk — no scene instance needed. Shows all GameObjects, components, and nested children inside the prefab. 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_prefab_get_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_prefab_get_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_prefab_get_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_prefab_get_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_prefab_get_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.