What sender IDs can I use to send SMS messages?

You must use a registered AT&T shortcode or dedicated long code as the sender ID. Unregistered or random numbers will be rejected by the carrier. You can provision new shortcodes with keywords using the `create_shortcode` tool, or check your existing ones through the messaging dashboard. Each shortcode can be configured with multiple keyword auto-responses.

Can I send MMS with images and what formats are supported?

Yes. The `send_mms` tool accepts a publicly accessible media URL. Supported formats include JPEG, PNG, GIF for images, MP4 for video, and common audio formats. The media URL must be reachable by AT&T's servers -- local or private URLs will fail. Maximum file size limits apply per carrier specifications, typically up to 1MB for images and 3.5MB for video.

How do I handle customer opt-out requests like STOP?

AT&T Messaging automatically processes standard opt-out keywords (STOP, CANCEL, UNSUBSCRIBE, QUIT). When a customer sends one of these, they are added to your suppression list and will no longer receive messages from that shortcode. You can monitor inbound messages with `get_inbound_messages` to track opt-out activity and verify your keyword configuration with `get_keyword_responses`.

AT&T Messaging MCP Server for Claude Code 9 tools — connect in under 2 minutes

Name: AT&T Messaging
Availability: InStock
Author: Vinkius

docs.anthropic.com/en/docs/claude-code

Built by Vinkius GDPR 9 Tools CLI

Claude Code is Anthropic's agentic CLI for terminal-first development. Add AT&T Messaging as an MCP server in one command and Claude Code will discover every tool at runtime — ideal for automation pipelines, CI/CD integration, and headless workflows via the Vinkius.

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Classic Setup·bash

# Your Vinkius token — get it at cloud.vinkius.com
claude mcp add att-messaging --transport http "https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp"

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* Every MCP server runs on Vinkius-managed infrastructure inside AWS - a purpose-built runtime with per-request V8 isolates, Ed25519 signed audit chains, and sub-40ms cold starts optimized for native MCP execution. See our infrastructure

About AT&T Messaging MCP Server

Connect your AT&T Messaging account to any AI agent and take full control of your SMS/MMS communication workflows through natural conversation.

Claude Code registers AT&T Messaging as an MCP server in a single terminal command. Once connected, Claude Code discovers all 9 tools at runtime and can call them headlessly — ideal for CI/CD pipelines, cron jobs, and automated workflows where AT&T Messaging data drives decisions without human intervention.

What you can do

SMS Messaging -- Send transactional alerts, OTPs, and customer notifications from registered shortcodes with delivery tracking
MMS Messaging -- Attach images, videos, or audio to enrich marketing campaigns and visual alerts
Bulk Send -- Broadcast the same message to hundreds of recipients in one request with per-recipient status tracking
Delivery Status -- Check real-time delivery state (sent, delivered, failed, read) for any message by its ID
Message History -- Query outbound and inbound message logs for auditing, compliance reporting, or reply tracking
Inbound Messages -- Retrieve customer replies, opt-outs, and keyword-triggered auto-responses
Shortcode Management -- Provision new shortcodes with keywords for campaign routing, or decommission retired numbers
Keyword Responses -- Review configured auto-reply logic for shortcode keywords to verify opt-in/opt-out flows

The AT&T Messaging MCP Server exposes 9 tools through the Vinkius. Connect it to Claude Code in under two minutes — no API keys to rotate, no infrastructure to provision, no vendor lock-in. Your configuration, your data, your control.

How to Connect AT&T Messaging to Claude Code via MCP

Follow these steps to integrate the AT&T Messaging MCP Server with Claude Code.

Install Claude Code

Run npm install -g @anthropic-ai/claude-code if not already installed

Add the MCP Server

Run the command above in your terminal

Verify the connection

Run claude mcp to list connected servers, or type /mcp inside a session

Start using AT&T Messaging

Ask Claude: "Using AT&T Messaging, show me..." — 9 tools are ready

Why Use Claude Code with the AT&T Messaging MCP Server

Claude Code provides unique advantages when paired with AT&T Messaging through the Model Context Protocol.

Single-command setup: `claude mcp add` registers the server instantly — no config files to edit or applications to restart

Terminal-native workflow means MCP tools integrate seamlessly into shell scripts, CI/CD pipelines, and automated DevOps tasks

Claude Code runs headlessly, enabling unattended batch processing using AT&T Messaging tools in cron jobs or deployment scripts

Built by the same team that created the MCP protocol, ensuring first-class compatibility and the fastest adoption of new protocol features

AT&T Messaging + Claude Code Use Cases

Practical scenarios where Claude Code combined with the AT&T Messaging MCP Server delivers measurable value.

CI/CD integration: embed AT&T Messaging tool calls in your deployment pipeline to validate configurations or fetch secrets before shipping

Headless batch processing: schedule Claude Code to query AT&T Messaging nightly and generate reports without human intervention

Shell scripting: pipe AT&T Messaging outputs into other CLI tools for data transformation, filtering, and aggregation

Infrastructure monitoring: run Claude Code in a cron job to query AT&T Messaging status endpoints and alert on anomalies

AT&T Messaging MCP Tools for Claude Code (9)

These 9 tools become available when you connect AT&T Messaging to Claude Code via MCP:

create_shortcode

Returns provisioning status and activation timeline. Use for new marketing campaigns or service alerts. Provision a new messaging shortcode with a keyword

delete_shortcode

Use when retiring a campaign or transferring numbers. Decommission a messaging shortcode

get_inbound_messages

Returns sender number, keyword matched, message body, and timestamp. Use for monitoring customer engagement or processing STOP/START commands. Retrieve recent inbound SMS/MMS from customers

get_keyword_responses

Use to review campaign logic or verify opt-in/opt-out flows. Get configured auto-replies for shortcode keywords

get_message_status

Use to track campaign performance or debug failed sends. Check delivery status of a specific message

list_messages

Returns timestamps, sender, recipient, and content snippets. Use for auditing, compliance reporting, or reply tracking. List outbound or inbound messaging history

send_bulk_sms

164 numbers. Returns job ID and per-recipient status array. Use for mass alerts, emergency broadcasts, or promotional campaigns. Send SMS to multiple recipients in one request

send_mms

Requires sender, recipient, message text, and media URL. Use for rich marketing campaigns, product images, or visual alerts. Send an MMS message with media attachment

send_sms

Requires sender ID, recipient E.164 number, and message body. Returns message ID and delivery status. Use this for transactional alerts, OTPs, or customer notifications. Send a single SMS message to a phone number

Example Prompts for AT&T Messaging in Claude Code

Ready-to-use prompts you can give your Claude Code agent to start working with AT&T Messaging immediately.

"Send an SMS from shortcode 12345 to +12125551234 saying 'Your order #48291 has shipped! Track it at example.com/track'."

"Send a bulk SMS to all these numbers: +12125551001, +12125551002, +12125551003 with the message 'Flash Sale: 50% off everything for the next 2 hours!'."

"Show me all inbound messages from the last 24 hours and check if anyone sent STOP."