device_bulk_set_property
AI agents use device_bulk_set_property 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 performs non-destructive modifications ('set') of properties on potentially many devices simultaneously. It creates or updates property values rather than deleting them or executing arbitrary code. The 'bulk' aspect increases the blast radius (high severity) if misused to corrupt game object state, but it remains a Write operation since changes can be reversed by subsequent property updates.
From the tool's definition Tool name 'device_bulk_set_property' indicates bulk modification of device properties. No description provided, but 'set_property' and 'bulk_' prefix imply creating or modifying data across multiple entities in the Unreal Editor for Fortnite environment.
Documented attack patterns abuse exactly the kind of access device_bulk_set_property 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 device_bulk_set_property:
{
"version": "1",
"default": "deny",
"tools": {
"device_bulk_set_property": {
"limits": [
{
"counter": "device_bulk_set_property_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}device_bulk_set_property 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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device_bulk_set_property. 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 device_bulk_set_property: 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.
device_bulk_set_property 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 device_bulk_set_property 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 device_bulk_set_property. 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.
device_bulk_set_property 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.
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143 Uefn tools catalogued and risk-classified — across an index of 43,000+ MCP servers.