AI agents call list_operators to retrieve information from FiftyOne MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a read-only query to list or enumerate operators. It has no side effects, does not modify data, does not execute code or external operations, and does not delete or move resources. The blast radius of misuse is minimal — an AI agent discovering what operators exist poses no security risk beyond information disclosure about the system's capabilities.
From the tool's definition Tool name is 'list_operators' and description states 'Discover all available FiftyOne operators' — this is a discovery/enumeration operation that retrieves information about available operators without modifying any data or executing operations.
Documented attack patterns abuse exactly the kind of access list_operators gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and FiftyOne MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for list_operators:
{
"version": "1",
"default": "deny",
"tools": {
"list_operators": {}
}
}list_operators is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
Free to start. No card required.
Discover all available FiftyOne operators. It is categorised as a Read tool in the FiftyOne MCP Server MCP Server, which means it retrieves data without modifying state.
Register the FiftyOne MCP Server MCP server in PolicyLayer and add a rule for list_operators: 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 FiftyOne MCP Server. Nothing to install.
list_operators 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_operators 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_operators. 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_operators is provided by the FiftyOne MCP Server MCP server (voxel51/fiftyone-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from FiftyOne MCP Server, 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.
47 FiftyOne MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.