Stop testing state for the range. Args: user_id: Optional user ID (admin only) Returns: Testing stop result
AI agents invoke stop_testing to trigger actions in Ludus FastMCP. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.
This tool executes a command to change the operational state of a cyber range environment—specifically halting an ongoing test. While not destructive (data is not irreversibly deleted), and not a simple read operation, it triggers an external operation whose effects depend on the range context. The 'admin only' parameter restriction indicates the platform recognizes this as a privileged action.
From the tool's definition Tool name 'stop_testing' and description 'Stop testing state for the range' indicate an action that terminates or halts an active testing operation. The presence of an optional 'user_id' parameter (admin only) suggests state-change authority.
Risk signalsAdmin/system-level operation
Documented attack patterns abuse exactly the kind of access stop_testing 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 stop_testing:
{
"version": "1",
"default": "deny",
"tools": {
"stop_testing": {
"limits": [
{
"counter": "stop_testing_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}stop_testing stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.
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Stop testing state for the range. Args: user_id: Optional user ID (admin only) Returns: Testing stop result. It is categorised as a Execute tool in the Ludus FastMCP MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the Ludus Fast MCP server in PolicyLayer and add a rule for stop_testing: 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.
stop_testing is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the stop_testing 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 stop_testing. 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.
stop_testing 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.