Check health and reachability of the device management interface.
AI agents call is_alive to retrieve information from Nornir MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves device state information (reachability/health status) with no side effects. It is equivalent to a ping or connection test, which are non-destructive diagnostic operations. Even if misused by an AI agent, it cannot modify device configuration, execute arbitrary commands, or cause data loss. The maximum blast radius is information disclosure of device availability.
From the tool's definition The tool 'is_alive' performs a health and reachability check of the device management interface. This is a query/diagnostic operation that returns status information without modifying, executing code, deleting, or committing financial changes on the target…
Documented attack patterns abuse exactly the kind of access is_alive gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Nornir MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for is_alive:
{
"version": "1",
"default": "deny",
"tools": {
"is_alive": {}
}
}is_alive is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Check health and reachability of the device management interface. It is categorised as a Read tool in the Nornir MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Nornir MCP Server MCP server in PolicyLayer and add a rule for is_alive: 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 Nornir MCP Server. Nothing to install.
is_alive 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 is_alive 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 is_alive. 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.
is_alive is provided by the Nornir MCP Server MCP server (yhvh-chen/nornir_mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Nornir 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.
26 Nornir MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.