List all text/sign actors in the level.
AI agents call sign_list to retrieve information from Uefn without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves or queries data about sign actors in the level without creating, modifying, deleting, or executing anything. It is a straightforward list operation that fits the Read category definition. The low severity reflects that listing existing actors poses minimal risk even if misused by an AI agent.
From the tool's definition Tool name 'sign_list' and description 'List all text/sign actors in the level' indicate a query/retrieval operation with no side effects.
Documented attack patterns abuse exactly the kind of access sign_list 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 sign_list:
{
"version": "1",
"default": "deny",
"tools": {
"sign_list": {}
}
}sign_list 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 text/sign actors in the level. It is categorised as a Read tool in the Uefn MCP Server, which means it retrieves data without modifying state.
Register the Uefn MCP server in PolicyLayer and add a rule for sign_list: 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.
sign_list 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 sign_list 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 sign_list. 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.
sign_list 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.