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How to connect HLR Lookup to Claude

Connect Claude Web, Desktop and Cowork to HLR Lookup MCP. Validate customer numbers before sending messages, check carrier and portability for leads, and more using natural language, with authentication handled for you.

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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

Introduction

Claude is Anthropic's AI assistant, available on the web, in the desktop app, and on mobile. Cowork is its agent for knowledge work, and it runs on all of those surfaces too. Connected to your apps, Claude can work with your files and services to accomplish complex tasks on your behalf.

This guide walks you through the easiest and most secure way to connect your HLR Lookup account to Claude via Composio Connect, enabling it to validate customer numbers before sending messages, check carrier and portability for leads, process yesterday's phone list in bulk, and more such actions on your behalf without compromising your account security.

Setup is the same on Claude Web, Desktop, and Cowork, and you only need to do it once. The connector is tied to your account, so it's available in all three.

Also integrate HLR Lookup with

ChatGPTHermesAtomic Agent

Connecting HLR Lookup to Claude Web, Desktop, and Cowork

Two ways to add the Composio connector. Pick whichever you prefer.

1. Add with one click

Click the button. Claude opens with the Composio connector filled in. Click Add, then go to step 2.

Add to Claude

Add manually

In Claude Desktop, click Customize in the left sidebar, then select Connectors and click the + icon at the top.

Claude Desktop connectors screen with Add custom connector selected

Click Add custom connector and paste in the Composio MCP server URL:

bash
https://connect.composio.dev/mcp
Add custom connector dialog with Composio MCP server URL

2. Authorize in your browser

Click Connect. You'll be redirected to a browser window where you can authorize Composio to continue.

Composio authorization screen for Claude Web, Desktop, and Cowork

3. Connect your HLR Lookup account

Back in Claude, ask it to connect to HLR Lookup or give it any HLR Lookup-related task.

For example, ask Claude to:

  • "Validate customer numbers before sending messages"
  • "Check carrier and portability for leads"
  • "Process yesterday's phone list in bulk"

It will prompt you to authenticate and authorize access.

That's it. Composio's tools are now available in Claude, and your HLR Lookup account is ready to use.

What is the HLR Lookup Claude Connector, and what's possible with it?

The HLR Lookup MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your HLR Lookup account. It provides structured and secure access to phone validation, HLR status checks, network and portability data, credit balances, and bulk processing, so your agent can validate phone numbers, check live phone status, identify mobile networks, manage lookup batches, and monitor available credits on your behalf.

  • Phone number validation: Have your agent validate up to 80 phone numbers at once and check their formatting and original network information.
  • HLR and network checks: Direct your agent to run live HLR lookups or retrieve mobile network and number portability data for up to 80 phone numbers.
  • Bulk lookup management: Let the agent create batches, upload phone numbers from JSON or CSV files, start or resume processing, pause work, and schedule a batch for a specific UTC time.
  • Batch progress and results: Instruct your agent to list batches, check their current progress, and download completed results as CSV or JSON files.
  • Credit balance monitoring: Have your agent check the remaining credit balance in your HLR Lookup account before running phone checks.

Troubleshooting

1. Why does Claude not use the Composio connector for HLR Lookup?

The connector can show as connected, but Claude must use it in each HLR Lookup conversation.

  • Click + at the lower left of the chat, or type /.
  • Hover Connectors.
  • Turn on Composio.
  • Ask Claude to connect to HLR Lookup again.

2. Why does Claude show an MCP server error before HLR Lookup connects?

Claude can show Couldn't reach the MCP server or Authorization with the MCP server failed when you add the connector for HLR Lookup.

  • Check that the connector URL is https://connect.composio.dev/mcp.
  • Connectors run from Anthropic's cloud, so your device network is usually not the problem.
  • Add the connector again from Customize > Connectors, then ask Claude to connect HLR Lookup.
  • If it fails again, send the error and the ofid_ reference id to support@composio.dev.

3. Why does the HLR Lookup authorization link not work?

The Composio connector is one server. Your HLR Lookup account connects separately when Claude asks for it.

  • If the browser does not open, or the link expires, ask Claude to retry the HLR Lookup connection.
  • Composio creates a fresh HLR Lookup authorization link.
  • Open that link in your browser and finish the HLR Lookup sign-in.

4. Why do HLR Lookup actions fail after they worked before?

The HLR Lookup connection can expire or lose permission.

  • Ask Claude to inspect the HLR Lookup connection.
  • If the connection is unhealthy, disconnect it when Claude prompts you.
  • Reconnect the HLR Lookup account and retry the action.
  • If Claude shows a permission prompt, approve it before Claude changes data in HLR Lookup.
  • If the action still fails with a permission error, check that the connected account has that permission in HLR Lookup itself.

5. How do I switch to a different HLR Lookup account?

Claude can manage the HLR Lookup connection for you.

  • Ask Claude to disconnect or delete the current HLR Lookup account.
  • Ask Claude to connect HLR Lookup again.
  • Open the new Composio authorization link for HLR Lookup.
  • Sign in with the other HLR Lookup account in the browser.
  • After the account connects, ask Claude to retry the HLR Lookup task.

6. Why is my HLR Lookup connection missing in Claude Desktop or on a Team plan?

The connector belongs to your Claude account, so your HLR Lookup connection works in Claude Web, Desktop, and Cowork.

  • In Claude Desktop, open Customize > Connectors.
  • Next to Composio, click ⋮ and click Clear cache.
  • If HLR Lookup tools still do not appear, click ⋮, disconnect, remove the connector, and add it again.
  • On Team or Enterprise, an Owner or Primary Owner must enable the connector before you can connect HLR Lookup.
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.

FRAMEWORKS

How to build HLR Lookup MCP Agent with another framework

ChatGPT logo

ChatGPT

Use HLR Lookup MCP with ChatGPT

Hermes logo

Hermes

Use HLR Lookup MCP with Hermes

Atomic Agent logo

Atomic Agent

Use HLR Lookup MCP with Atomic Agent

FAQ

Frequently asked questions

With a standalone HLR Lookup MCP server, the agents and LLMs can only access a fixed set of HLR Lookup tools tied to that server. However, with the Composio Tool Router, agents can dynamically load tools from HLR Lookup and many other apps based on the task at hand, all through a single MCP endpoint.

Yes, you can. Claude Cowork fully supports MCP integration. You get structured tool calling, message history handling, and model orchestration while Tool Router takes care of discovering and serving the right HLR Lookup tools.

Yes, absolutely. You can configure which HLR Lookup scopes and actions are allowed when connecting your account to Composio. You can also bring your own OAuth credentials or API configuration so you keep full control over what the agent can do.

All sensitive data such as tokens, keys, and configuration is fully encrypted at rest and in transit. Composio is SOC 2 Type 2 compliant and follows strict security practices so your HLR Lookup data and credentials are handled as safely as possible.

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