AI agents call list_categories to retrieve information from Aceternityui without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a simple data retrieval operation—listing available categories from the Aceternity UI component library. It has no capability to modify, execute, or delete data. The blast radius of misuse is minimal, as an AI agent cannot cause harm by querying what categories exist in a UI component library.
From the tool's definition Tool name 'list_categories' and description 'List all available component categories' indicate a query operation that retrieves metadata without modification or side effects.
Documented attack patterns abuse exactly the kind of access list_categories gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Aceternityui, and nothing reaches the server without passing your rules. This is the rule we recommend for list_categories:
{
"version": "1",
"default": "deny",
"tools": {
"list_categories": {}
}
}list_categories is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List all available component categories. It is categorised as a Read tool in the Aceternityui MCP Server, which means it retrieves data without modifying state.
Register the Aceternityui MCP server in PolicyLayer and add a rule for list_categories: 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 Aceternityui. Nothing to install.
list_categories is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the list_categories 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 list_categories. 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.
list_categories is provided by the Aceternityui MCP server (rudra016/aceternityui-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Aceternityui, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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5 Aceternityui tools catalogued and risk-classified — across an index of 43,000+ MCP servers.