List all available scenarios. Returns: Dictionary of scenario keys and descriptions
AI agents call list_scenarios 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 queries and returns information about available scenarios without modifying, executing, or destroying any data. It is a straightforward read operation that retrieves metadata about scenarios in the Ludus cyber range environment.
From the tool's definition Tool name is 'list_scenarios' and description states it 'List all available scenarios' with return value being a 'Dictionary of scenario keys and descriptions'. This is a pure retrieval operation with no side effects.
Documented attack patterns abuse exactly the kind of access list_scenarios 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 list_scenarios:
{
"version": "1",
"default": "deny",
"tools": {
"list_scenarios": {}
}
}list_scenarios 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 scenarios. Returns: Dictionary of scenario keys and descriptions. 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 list_scenarios: 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.
list_scenarios 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_scenarios 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_scenarios. 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_scenarios 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.
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201 Ludus FastMCP tools catalogued and risk-classified — across an index of 42,500+ MCP servers.