AI agents call get_users 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 queries and retrieves user configuration data from network devices without altering, executing, or deleting anything. It is a read-only operation consistent with other sibling tools like get_arp_table, get_config, and get_facts. The blast radius of misuse is low—an attacker gains visibility into user accounts but cannot modify them or trigger actions on the network.
From the tool's definition Tool name 'get_users' and description 'Get locally configured users on the device' indicate a retrieval operation with no modification or side effects.
Documented attack patterns abuse exactly the kind of access get_users 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 get_users:
{
"version": "1",
"default": "deny",
"tools": {
"get_users": {}
}
}get_users is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get locally configured users on the device. 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 get_users: 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.
get_users 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 get_users 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 get_users. 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.
get_users 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.
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26 Nornir MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.