Delete a child GameObject from inside a prefab asset — no scene instance needed. Cannot remove the prefab root.
AI agents call unity_prefab_remove_gameobject to permanently remove resources in Unity MCP Server — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
This tool irreversibly deletes data (a GameObject component) from a prefab asset. Deletion cannot be undone by the tool itself and requires version control recovery or manual restoration. While scoped to child GameObjects (not the prefab root), the destructive nature and potential to corrupt project assets by removing critical scene components justifies the 'Destructive' category and 'high' severity.
From the tool's definition Tool name contains 'remove' and description explicitly states 'Delete a child GameObject from inside a prefab asset'. The operation is irreversible — deleting a GameObject from a prefab permanently removes it from the asset.
Risk signalsAdmin/system-level operation
Documented attack patterns abuse exactly the kind of access unity_prefab_remove_gameobject 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_remove_gameobject:
{
"version": "1",
"default": "deny",
"hide": [
"unity_prefab_remove_gameobject"
]
}unity_prefab_remove_gameobject disappears from the agent's tool list entirely, and any attempt to call it is denied. The rest of the server keeps working.
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Delete a child GameObject from inside a prefab asset — no scene instance needed. Cannot remove the prefab root. It is categorised as a Destructive tool in the Unity MCP Server MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Unity MCP Server MCP server in PolicyLayer and add a rule for unity_prefab_remove_gameobject: 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_remove_gameobject is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the unity_prefab_remove_gameobject 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_remove_gameobject. 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_remove_gameobject 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.
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324 Unity MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.