AI agents call clear_scene to permanently remove resources in Blender — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
This tool permanently removes all objects from a Blender scene, which is an irreversible operation that cannot be undone by normal means (beyond undo history). While not as catastrophic as deleting files from disk, clearing an entire scene represents a destructive action with significant blast radius—an AI agent could lose hours of 3D work.
From the tool's definition Tool name 'clear_scene' and description 'Remove all objects from the current scene' indicate irreversible deletion of scene content.
Documented attack patterns abuse exactly the kind of access clear_scene gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Blender, and nothing reaches the server without passing your rules. This is the rule we recommend for clear_scene:
{
"version": "1",
"default": "deny",
"hide": [
"clear_scene"
]
}clear_scene 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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Remove all objects from the current scene. It is categorised as a Destructive tool in the Blender MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Blender MCP server in PolicyLayer and add a rule for clear_scene: 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 Blender. Nothing to install.
clear_scene 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 clear_scene 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 clear_scene. 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.
clear_scene is provided by the Blender MCP server (sandraschi/blender-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Blender, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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77 Blender tools catalogued and risk-classified — across an index of 43,000+ MCP servers.