AI agents use material_bulk_swap 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.
The name 'material_bulk_swap' strongly implies batch replacement of materials on actors/assets in the UEFN editor. 'Bulk' operations affecting many objects at once are reversible in principle (materials can be reassigned), placing this in Write. However, the empty description lowers confidence, and the bulk nature means misuse could affect many assets simultaneously, warranting high severity.
From the tool's definition Tool name 'material_bulk_swap' — description is empty and uninformative.
Documented attack patterns abuse exactly the kind of access material_bulk_swap 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 material_bulk_swap:
{
"version": "1",
"default": "deny",
"tools": {
"material_bulk_swap": {
"limits": [
{
"counter": "material_bulk_swap_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}material_bulk_swap 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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material_bulk_swap. 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 material_bulk_swap: 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.
material_bulk_swap 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 material_bulk_swap 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 material_bulk_swap. 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.
material_bulk_swap 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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