AI agents call discover_services_mdns to retrieve information from SeldomMaster without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
mDNS service discovery retrieves information about services available on a local network without modifying or executing anything. This is a Read operation—information retrieval with no side effects. Severity is medium rather than low because network reconnaissance can map attack surfaces, though the immediate blast radius depends on what an AI agent does with the discovered information.
From the tool's definition Tool name 'discover_services_mdns' indicates network service discovery via mDNS (Multicast DNS) protocol. The sibling tools 'discover_neighbors_arp' and 'discover_neighbors_ssdp' are clearly reconnaissance/discovery utilities that query local network state…
Documented attack patterns abuse exactly the kind of access discover_services_mdns 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_services_mdns:
{
"version": "1",
"default": "deny",
"tools": {
"discover_services_mdns": {}
}
}discover_services_mdns is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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discover_services_mdns. It is categorised as a Read tool in the SeldomMaster MCP Server, which means it retrieves data without modifying state.
Register the SeldomMaster MCP server in PolicyLayer and add a rule for discover_services_mdns: 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_services_mdns 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 discover_services_mdns 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_services_mdns. 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_services_mdns 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.
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52 SeldomMaster tools catalogued and risk-classified — across an index of 43,000+ MCP servers.