AI agents call contains to retrieve information from Ip without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and evaluates information about IP address membership in a CIDR block without causing any side effects or modifications to any data. It is a simple lookup/query operation with minimal potential for harm even if misused by an agent, making it a low-severity Read operation.
From the tool's definition Tool performs a read-only check operation: 'Check whether an IP address is inside a CIDR block'. No data is created, modified, deleted, or executed. It is a pure query function that validates membership in a CIDR range.
Attacks that exploit this kind of access
Check whether an IP address is inside a CIDR block (e.g. 10.0.0.0/8). It is categorised as a Read tool in the Ip MCP Server, which means it retrieves data without modifying state.
Register the Ip MCP server in PolicyLayer and add a rule for contains: 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 Ip. Nothing to install.
contains 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 contains 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 contains. 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.
contains is provided by the Ip MCP server (mukundakatta/ip-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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