Hide actors in the editor viewport (not in-game).
AI agents use actor_hide to create or update resources in Uefn — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Uefn environment.
This tool modifies the visibility state of actors within the UEFN editor viewport. It is a reversible change (actors can be shown again, as evidenced by the sibling tool 'actor_show'), affecting only the editor view and not the actual game or persistent data. This fits the Write category — a reversible modification with low blast radius.
From the tool's definition Hide actors in the editor viewport (not in-game)
Documented attack patterns abuse exactly the kind of access actor_hide gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Uefn, and nothing reaches the server without passing your rules. This is the rule we recommend for actor_hide:
{
"version": "1",
"default": "deny",
"tools": {
"actor_hide": {
"limits": [
{
"counter": "actor_hide_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}actor_hide stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.
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Hide actors in the editor viewport (not in-game). It is categorised as a Write tool in the Uefn MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Uefn MCP server in PolicyLayer and add a rule for actor_hide: 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 Uefn. Nothing to install.
actor_hide is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the actor_hide 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 actor_hide. 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.
actor_hide is provided by the Uefn MCP server (quangdang46/uefn-verse-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Uefn, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
143 Uefn tools catalogued and risk-classified — across an index of 43,000+ MCP servers.