AI agents call lookup_mnp to retrieve information from Seven without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The lookup_mnp tool retrieves and queries carrier information without modifying, deleting, or executing any operations. It has no side effects and poses minimal security risk as it only returns publicly available carrier data associated with phone numbers.
From the tool's definition Tool description states 'Perform Mobile Number Portability lookup (carrier information)' — this is a data retrieval operation that queries carrier information for a phone number.
Attacks that exploit this kind of access
Perform Mobile Number Portability lookup (carrier information). It is categorised as a Read tool in the Seven MCP Server, which means it retrieves data without modifying state.
Register the Seven MCP server in PolicyLayer and add a rule for lookup_mnp: 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 Seven. Nothing to install.
lookup_mnp 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 lookup_mnp 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 lookup_mnp. 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.
lookup_mnp is provided by the Seven MCP server (seven-io/seven-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.
Teams ship this data inside their own products. See what a licence covers →