Look up the Local Routing Number (LRN) for a phone number. Returns the LRN, SPID (Service Provider ID), LNP type, and activation timestamp. LRN identifies the switch that serves a ported phone number. This queries live LSMS/NPAC porting data.
AI agents call lrn_lookup to retrieve information from Telique MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a read-only lookup operation against telecom routing databases. It retrieves information about phone number portability without modifying, deleting, or executing any operations. While the data retrieved could inform social engineering or targeted attacks, the tool itself has no side effects and merely queries existing data.
From the tool's definition Tool description states it 'Look up' and 'Returns' LRN and associated metadata by querying 'live LSMS/NPAC porting data'. No modification, deletion, or execution keywords present.
Attacks that exploit this kind of access
Look up the Local Routing Number (LRN) for a phone number. Returns the LRN, SPID (Service Provider ID), LNP type, and activation timestamp. LRN identifies the switch that serves a ported phone number. This queries live LSMS/NPAC porting data. It is categorised as a Read tool in the Telique MCP MCP Server, which means it retrieves data without modifying state.
Register the Telique MCP server in PolicyLayer and add a rule for lrn_lookup: 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 Telique MCP. Nothing to install.
lrn_lookup 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 lrn_lookup 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 lrn_lookup. 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.
lrn_lookup is provided by the Telique MCP server (ringer/telique-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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