Discovers IP addresses on the local network using the arp tool. Primes the pump by first ping sweeping any locally connected networks.
AI agents invoke discover_neighbors_arp to trigger actions in SeldomMaster. 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 actively executes network reconnaissance operations: it runs a ping sweep across locally connected networks and then uses the ARP tool to discover neighbors. These are active network scanning operations that trigger external network traffic and reveal network topology. Given the server's stated purpose of 'local network hacking,' misuse could facilitate unauthorized network mapping and lateral movement.
From the tool's definition 'Discovers IP addresses on the local network using the arp tool. Primes the pump by first ping sweeping any locally connected networks.'
Documented attack patterns abuse exactly the kind of access discover_neighbors_arp gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and SeldomMaster, and nothing reaches the server without passing your rules. This is the rule we recommend for discover_neighbors_arp:
{
"version": "1",
"default": "deny",
"tools": {
"discover_neighbors_arp": {
"limits": [
{
"counter": "discover_neighbors_arp_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}discover_neighbors_arp 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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Discovers IP addresses on the local network using the arp tool. Primes the pump by first ping sweeping any locally connected networks. It is categorised as a Execute tool in the SeldomMaster MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the SeldomMaster MCP server in PolicyLayer and add a rule for discover_neighbors_arp: 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 SeldomMaster. Nothing to install.
discover_neighbors_arp 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 discover_neighbors_arp 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 discover_neighbors_arp. 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.
discover_neighbors_arp is provided by the SeldomMaster MCP server (paralax/seldommonster). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from SeldomMaster, 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.
52 SeldomMaster tools catalogued and risk-classified — across an index of 43,000+ MCP servers.