HLR Lookup MCP server for AI agents and assistants

Securely connect your AI agents and chatbots (Claude, ChatGPT, Cursor, etc) with HLR Lookup MCP or direct API to validate phone numbers, check carrier details, verify portability, and process bulk lookups through natural language.

HLR Lookup logoHLR Lookup
Api Key

HLR Lookup is a phone-number intelligence service for validation, network checks, and portability data. It helps businesses verify numbers, reduce failed messages, and process lookups at scale.

14 Tools

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Type what you want done — sign in and watch it run live in the Tool Router playground.

TOOL ROUTER PLAYGROUND
HLR Lookup
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TOOLS

Supported Tools

Every HLR Lookup action and event your agent gets out of the box.

Check Phone Status

Run full HLR lookups for 1-80 phone numbers.

Create Batch

Create an empty persistent HLR_V2 batch.

Delete Batch

Permanently delete one HLR batch and its results.

Download Batch Results

Download a completed batch's full, unpaginated CSV or JSON result export, including source phone values and sensitive HLR intelligence, as a file reference.

Get Credit Balance

Return the connected HLR Lookup account's remaining credit balance.

Get Batch

Return metadata and current progress for one HLR batch.

List Batches

List the connected account's HLR batches with their metadata and progress.

Run MNP Lookup

Look up network and mobile-number-portability data for 1-80 phone numbers.

Pause Batch

Pause processing one HLR batch.

Schedule Batch

Schedule processing of one uploaded HLR batch at a UTC time.

Start or Resume Batch

Start or resume processing one uploaded HLR batch.

Upload Batch CSV

Upload a CSV file of sensitive phone data into an empty HLR batch.

Upload Batch Phone Numbers

Upload 1-100,000 sensitive phone numbers into an empty HLR batch as a compact JSON array.

Validate Phone Numbers

Validate formatting and original-network information for 1-80 phone numbers without a live HLR lookup.

SETUP GUIDE

Connect HLR Lookup MCP Tool with your Agent

1

Install Composio

typescript
npm install @composio/core ai @ai-sdk/mcp @ai-sdk/openai
Install the Composio SDK and your agent framework
2

Create a session with MCP enabled

typescript
import { Composio } from "@composio/core";

const composio = new Composio();
const { mcp } = await composio.create("your-user-id", {
  toolkits: ["hlr_lookup"],
  mcp: true,
});
Create a session scoped to HLR Lookup and read its MCP URL and headers
3

Connect your agent to the MCP server

typescript
import { createMCPClient } from "@ai-sdk/mcp";
import { openai } from "@ai-sdk/openai";
import { generateText, stepCountIs } from "ai";

const client = await createMCPClient({
  transport: { type: "http", url: mcp.url, headers: mcp.headers },
});

const { text } = await generateText({
  model: openai("gpt-5.6-sol"),
  tools: await client.tools(),
  prompt: "Validate the phone number +14155552671 and return its carrier and portability details.",
  stopWhen: stepCountIs(10),
});

console.log(text);
await client.close();
Pass the session's MCP URL and headers to your agent and run a HLR Lookup request
SETUP GUIDE

Connect HLR Lookup API Tool with your Agent

1

Install Composio

typescript
npm install @composio/core @composio/openai openai
Install the Composio SDK, the OpenAI provider, and the OpenAI SDK
2

Create a Composio session

typescript
import OpenAI from "openai";
import { Composio } from "@composio/core";
import { OpenAIResponsesProvider } from "@composio/openai";

const composio = new Composio({ provider: new OpenAIResponsesProvider() });
const client = new OpenAI();

const session = await composio.create("your-user-id", { toolkits: ["hlr_lookup"] });
const tools = await session.tools();
Initialize Composio with the OpenAI Responses provider and create a session scoped to HLR Lookup
3

Run HLR Lookup tools with your agent

typescript
let response = await client.responses.create({
  model: "gpt-5.6-sol",
  tools,
  input: [{ role: "user", content: "Validate the phone number +14155552671 and return its carrier and portability details." }],
});

while (response.output.some((o) => o.type === "function_call")) {
  const outputs = await composio.provider.handleToolCalls(session, response.output);
  response = await client.responses.create({
    model: "gpt-5.6-sol",
    tools,
    previous_response_id: response.id,
    input: outputs,
  });
}

console.log(response.output_text);
Send a request, execute the HLR Lookup tool calls through the session, and print the final answer

Why Use Composio?

AI Native HLR Lookup Integration

  • Supports both HLR Lookup MCP and direct API based integrations
  • Structured, LLM-friendly schemas for reliable phone-number validation and network lookups
  • Rich coverage for number checks, account balances, portability data, and bulk HLR processing

Managed Auth

  • Securely store and use your HLR Lookup API key without hard-coding credentials
  • Central place to manage, scope, and revoke HLR Lookup access
  • Per user and per environment credentials for safer deployments

Agent Optimized Design

  • Tools are tuned using real error and success rates to improve reliability over time
  • Comprehensive execution logs so you always know what ran, when, and on whose behalf

Enterprise Grade Security

  • Fine-grained RBAC so you control which agents and users can access HLR Lookup
  • Scoped, least privilege access to HLR Lookup resources
  • Full audit trail of agent actions to support review and compliance

Rolling this out across your team?

Give your team centralized access control across every framework with Composio’s MCP Gateway.

EXPLORE MCP GATEWAY
FAQ

Frequently asked questions

Yes, HLR Lookup requires you to configure your own API key. Once set up, Composio handles secure credential storage and API request handling for you.

Yes! Composio's Tool Router enables agents to use multiple toolkits. Learn more.

Yes. Composio is SOC 2 Type II compliant and is built to keep your HLR Lookup connection and credentials secure. OAuth tokens and API keys are encrypted, and sensitive customer data is protected at rest and in transit.

Composio also undergoes independent security testing and continuously monitors its systems for security threats. You can review the latest reports and policies in the Composio Trust Center.

Composio maintains and updates all toolkit integrations automatically, so your agents always work with the latest API versions.

Create the key in your HLR Lookup account settings, then paste it once on Composio's connection page. Composio stores it encrypted and uses it only for the HLR Lookup actions your agent runs. Nobody else in your workspace can read it, and you can revoke it inside HLR Lookup at any time.

When you connect a HLR Lookup account through Composio, every action runs under that account, so anything the agent creates, sends, or changes shows up in HLR Lookup as done by you. Keep an approval step in your prompt for actions with side effects, such as sending or deleting, and have the agent draft first.

Whatever the credentials you connect allow inside HLR Lookup. If HLR Lookup lets you scope a key to specific permissions, create a scoped one so the agent can only do what you intend. You can revoke the key inside HLR Lookup at any time.

Yes. Composio supports multiple connected accounts for the same app, and that works in Claude, ChatGPT, or any other assistant you connect through Composio. Give each HLR Lookup connection a name such as work or personal, and the assistant uses the one you mention in the request. Each account keeps its own credentials and nothing is merged.

The connection stops working the moment HLR Lookup rejects the old key. Create a new key in HLR Lookup and reconnect the account from the Composio dashboard or by asking your agent to reconnect HLR Lookup. Nothing else changes.

Composio's free Hobby plan includes 100,000 tool calls per month with no credit card, which covers most personal HLR Lookup use. Paid plans add higher limits and team features. Your HLR Lookup plan and its API limits still apply as usual.

Built-in connectors usually give one AI access to a limited set of apps. Many people use Composio because it lets their AI connect to more apps than it normally supports, or connect to multiple accounts for the same app (e.g. connect Claude to multiple HLR Lookup accounts).

With Composio, you connect HLR Lookup once and then use it across different AI assistants without setting it up separately in each one. Connect your apps to Composio once, then connect Composio to whichever AI you use, whether that's Claude, ChatGPT, Hermes, or your own custom assistant.

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