AI agents call subnet_split to retrieve information from Net without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
subnet_split appears to be a network utility that divides or analyzes subnets without modifying any state. It fits the pattern of read-only diagnostic tools on this network engineering server. No side effects, no data creation/modification, no code execution, no deletion.
From the tool's definition Tool name 'subnet_split' and sibling tools (bgp_asn_info, bgp_prefix_origin, bgp_route_lookup, bogon_check, dns_lookup, etc.) are all diagnostic and informational.
Attacks that exploit this kind of access
subnet_split. It is categorised as a Read tool in the Net MCP Server, which means it retrieves data without modifying state.
Register the Net MCP server in PolicyLayer and add a rule for subnet_split: 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 Net. Nothing to install.
subnet_split 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 subnet_split 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 subnet_split. 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.
subnet_split is provided by the Net MCP server (steelcutoatmeal/net-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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