Highlight an object for debugging (wireframe or visibility toggle). Runtime only — for visual inspection, not persisted. Debug only — page reload will reset. No code changes needed.
Part of the Threejs Devtools server.
Free to start. No card required.
AI agents may call highlight_object to permanently remove or destroy resources in Threejs Devtools. Without a policy, an autonomous agent could delete critical data in a loop with no way to undo the damage. PolicyLayer blocks destructive tools by default and requires explicit human approval before enabling them.
Without a policy, an AI agent could call highlight_object in a loop, permanently destroying resources in Threejs Devtools. There is no undo for destructive operations. PolicyLayer blocks this tool by default and only allows it when a human explicitly approves the action.
Destructive tools permanently remove data. Block by default. Only enable with explicit approval workflows.
{
"version": "1",
"default": "deny",
"hide": [
"highlight_object"
]
}See the full Threejs Devtools policy for all 60 tools.
These attack patterns abuse exactly the kind of access highlight_object gives an agent. Each links to the full case and the policy that stops it:
Other destructive tools across the catalogue. The same approach applies to each: deny by default, or require human approval.
Highlight an object for debugging (wireframe or visibility toggle). Runtime only — for visual inspection, not persisted. Debug only — page reload will reset. No code changes needed.. It is categorised as a Destructive tool in the Threejs Devtools MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Threejs Devtools MCP server in PolicyLayer and add a rule for highlight_object: 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 Threejs Devtools. Nothing to install.
highlight_object 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 highlight_object 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 highlight_object. 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.
highlight_object is provided by the Threejs Devtools MCP server (threejs-devtools-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 60 Threejs Devtools tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
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