Test authentication and get user info. Returns: Current user information
AI agents call whoami to retrieve information from Ludus FastMCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves the current authenticated user's information, which is a read-only operation with no capability to modify state, execute commands, or cause destructive changes. The low severity reflects minimal risk even if misused by an AI agent, as it only returns identity information already accessible to the authenticated session.
From the tool's definition Tool name 'whoami' and description 'Test authentication and get user info. Returns: Current user information' indicate a query operation that retrieves user identity data without modification or side effects.
Documented attack patterns abuse exactly the kind of access whoami gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Ludus FastMCP, and nothing reaches the server without passing your rules. This is the rule we recommend for whoami:
{
"version": "1",
"default": "deny",
"tools": {
"whoami": {}
}
}whoami is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Test authentication and get user info. Returns: Current user information. It is categorised as a Read tool in the Ludus FastMCP MCP Server, which means it retrieves data without modifying state.
Register the Ludus Fast MCP server in PolicyLayer and add a rule for whoami: 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 Ludus FastMCP. Nothing to install.
whoami 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 whoami 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 whoami. 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.
whoami is provided by the Ludus Fast MCP server (tjnull/ludus-fastmcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 201 Ludus FastMCP tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
201 Ludus FastMCP tools catalogued and risk-classified — across an index of 42,500+ MCP servers.