---
title: "Using Claude Code to Automate End-to-End User Signups with SMS Verification"
---

Using Claude Code to Automate End-to-End User Signups with SMS Verification: SMSRiver

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Model Context Protocol & AI Agents

Model Context Protocol & AI Agents

Published 2026-08-22

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8 min read

#
Using Claude Code to Automate End-to-End User Signups with SMS Verification

Workflow guide: equip Claude Code with SMSRiver MCP tools to test user registration, solve SMS verification challenges, and debug onboarding bugs autonomously.

Key Takeaway & Executive Summary

Empower Claude Code to run automated Playwright tests, fetch its own SMS verification codes via MCP, and complete full end-to-end user journeys.

Autonomous coding agents like Claude Code can author test code, launch headless browsers, and inspect application output. However, user authentication forms with SMS 2FA historically blocked autonomous execution. By connecting Claude Code to SMSRiver's MCP server, agents can test complete authentication lifecycles end-to-end.

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Table of Contents

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[
The Autonomous Verification Workflow
](#section-1)

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Frequently Asked Questions
](#frequently-asked-questions)

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1

The Autonomous Verification Workflow

1. Claude Code generates test script and launches Playwright.
2. When the phone prompt appears, Claude Code calls mcp__smsriver__get_active_numbers(country='US').
3. Enters the phone number into the form.
4. Calls mcp__smsriver__extract_otp(phone_number='+12025550199').
5. Receives the 6-digit code in its reasoning context and enters it to complete verification.

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Frequently Asked Questions • Model Context Protocol & AI Agents

Is human intervention required during the run?

No. The MCP tool returns the parsed OTP directly into the model's tool-call response, allowing 100% autonomous execution in CI environments.

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Related Technical Articles & Deep Dives

[

Model Context Protocol & AI Agents
9 min read

###
Building Model Context Protocol (MCP) Servers for Telephony and SMS Testing

](/articles/mcp-server-telephony-integration/)

[

Model Context Protocol & AI Agents
7 min read

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Connecting Cursor AI to Inbound Phone Pools via Model Context Protocol

](/articles/cursor-ai-mcp-telephony-tooling/)

[

Model Context Protocol & AI Agents
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###
Regex vs LLM Extraction: Extracting OTP Codes and Magic Links from Raw SMS

](/articles/prompt-engineering-for-otp-extraction/)

Developer Sandbox

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Automate Inbound SMS & OTP Testing

Eliminate flaky 2FA in CI/CD. Access dedicated virtual lines, programmable synthetic SMS webhooks, and Model Context Protocol (MCP) integrations.

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Developer Utilities

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[
SMS Segment Calculator
Calculate segment counts and carrier costs in real time.
](/tools/sms-segment-calculator/)

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Webhook Payload Validator
Verify JSON webhook payloads against provider schemas.
](/tools/webhook-payload-validator/)

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SMS Delivery Troubleshooter
Diagnose carrier filtering and OTP delivery failure.
](/tools/sms-delivery-troubleshooter/)

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E.164 Phone Number Formatter
Format phone numbers into international E.164 standard.
](/tools/phone-number-formatter/)

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Public Verification Numbers

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United States (+1)
View Line →
](/receive-sms/us/)

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United Kingdom (+44)
View Line →
](/receive-sms/gb/)

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Canada (+1)
View Line →
](/receive-sms/ca/)

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[
Germany (+49)
View Line →
](/receive-sms/de/)

Copied to clipboard

FULL PACKET INSPECTION
SMS

###
Line: DE +49 ...

Timestamp: Just now

Extracted code

Copy Code

Message Body:

Copy Full Message

[
Open Live Inbox

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smsriver.com

Central Office carrier inventory platform & developer SMS verification sandbox. Receive OTP codes instantly with zero SIM card requirement.

Public numbers·Live inboxes·Developer tools

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- [United Kingdom (+44)](/receive-sms/gb/)

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Developer & Tools

- [SMS Debugging Workbench](/workbench/)

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