check_librenms

Check LibreNMS (network monitoring) reachability via GET /. Default port 80.

SERVERMcp Nettools SOURCEaaronckj/mcp-nettools

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/aaronckj-mcp-nettools/check-librenms.md

WHAT IT DOES

What check_librenms does on Mcp Nettools

AI agents call check_librenms to retrieve information from Mcp Nettools without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why check_librenms is rated Low

This tool queries the status/reachability of a LibreNMS service by issuing a GET request to its root endpoint. This is a passive read operation with no side effects—it does not modify data, execute commands, delete resources, or commit financial actions. The blast radius if misused is minimal; a misconfigured URL or timing issue causes only a benign connectivity test.

From the tool's definition Tool performs a GET request to check reachability (/.); no modifications, deletions, or external operations triggered. Description explicitly states it checks reachability via GET, which is a read-only HTTP method.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs check_librenms safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Mcp Nettools, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For check_librenms, this is the rule to start with:

check_librenms Allowed

check_librenms is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "check_librenms": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Mcp Nettools, apply this rule, and every check_librenms call is checked against it from then on.

FAQ

Questions about check_librenms

What does the check_librenms tool do? +

Check LibreNMS (network monitoring) reachability via GET /. Default port 80. It is categorised as a Read tool in the Mcp Nettools MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on check_librenms? +

Register the Mcp Nettools MCP server in PolicyLayer and add a rule for check_librenms: 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 Mcp Nettools. Nothing to install.

What risk level is check_librenms? +

check_librenms is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit check_librenms? +

Yes. Add a rate_limit block to the check_librenms 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.

How do I block check_librenms completely? +

Set action: deny in the PolicyLayer policy for check_librenms. 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.

What MCP server provides check_librenms? +

check_librenms is provided by the Mcp Nettools MCP server (aaronckj/mcp-nettools). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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