# Twilio messaging services Human Guide

## What This Is For
A Messaging Service groups senders (phone numbers, short codes, toll-free numbers) with shared configuration. It gives the agent a clearer input/output frame for twilio messaging services: what context to ask for, what decisions to make, and what usable artifact to return.

Use this as a human-readable version of the Twilio messaging services agent skill. It is meant for marketers, operators, founders, and other non-coders who want the workflow without reading agent-specific implementation instructions.

## When To Use This
- Use this when you need a repeatable process for twilio messaging services.
- Use this when the task needs judgment, examples, constraints, or a clear output format rather than a one-off prompt.
- Use this when you want to hand an AI assistant enough context to produce a usable marketing artifact.

## When Not To Use This
- Do not use this when you only need a quick factual answer.
- Do not use this when the work depends on private data you cannot share with the assistant.
- Do not use this as a replacement for legal, compliance, financial, or medical review.

## What You Need Before Starting
- The goal or business outcome you want.
- The audience, customer segment, or market context.
- Any source material the assistant should respect, such as notes, briefs, examples, URLs, or brand guidance.
- Constraints such as tone, length, channel, deadline, region, or approval requirements.
- A clear definition of what a good final answer should look like.

## Step-By-Step Workflow
1. State the job clearly: "Use the Twilio messaging services guide to help me with..."
2. Add context: audience, goal, offer, channel, source material, and constraints.
3. Ask the assistant to identify missing inputs before producing the final output.
4. Have the assistant follow the skill-specific guidance below.
5. Review the result against the final checklist and ask for revisions where needed.

## Skill-Specific Guidance
- Twilio account with at least one SMS-capable phone number
- SDK: `pip install twilio` / `npm install twilio`
- Combines behavioral analysis with known fraud scheme identification using Twilio's proprietary model
- Analyzes: messages to regions known for pumping, countries with no prior sending history, patterns suggesting non-human behavior
- Auto-blocks suspected pumping destinations — returns error **30450**
- Enable in Console: Messaging > Settings > General > SMS Pumping Protection
- **Free in US/Canada**; other regions check SMS Pricing page
- `enable` (default for OTP/2FA messages): Apply SMS pumping protection
- `disable`: Skip protection (use for marketing messages where false positives are costly)
- Configure a branded short domain in Console (e.g., `link.yourcompany.com`)
- Enable `ShortenUrls: true` on your Messaging Service
- Links are retained for **90 days** after creation

## Decision Points And Nuance
The original skill emphasizes: Overview, Prerequisites, Quickstart, Key Patterns, Create Service with Webhooks and Features, Optional Features, List Services and Numbers, Production Messaging Features, Message Scheduling, Compliance Toolkit (US SMS, Public Beta).

Use these questions to steer the work:
- What is the intended audience or buyer?
- What source material must be preserved?
- What should the assistant optimize for: clarity, persuasion, accuracy, speed, creativity, or conversion?
- What examples represent the desired quality bar?
- What should the assistant avoid?

## Common Mistakes
- Classifies: **Urgent** (>0.80), **Important** (0.40–0.80), **Warning** (<0.40)
- **Cannot schedule messages without a Messaging Service** — `sendAt` requires `messagingServiceSid`, not `from`. Must also set `schedule_type="fixed"`
- **Cannot use link shortening without a branded domain** — Must configure a custom short domain first; no default short domain provided
- **Messaging Services are required for US A2P 10DLC** — Campaign registration attaches to a Messaging Service

## Copy-And-Paste Prompt
```text
Use the Twilio messaging services human guide.

My goal:
[Describe the business outcome]

Audience:
[Describe who this is for]

Context and source material:
[Paste notes, examples, links, or existing copy]

Constraints:
[Tone, length, channel, timeline, must-include items, must-avoid items]

Before producing the final output, ask me for any missing information that would materially improve the result.
```

## Final Checklist
- [ ] The output matches the original goal.
- [ ] The audience and context are reflected in the answer.
- [ ] Important constraints and source material were preserved.
- [ ] The assistant made the relevant decisions explicit.
- [ ] The final artifact is ready to use, review, or hand to the next person.

## Source
This guide was generated from the twilio/ai skill entry for `twilio-messaging-services`.

## Source Skill Notes
These notes preserve the nuance from the original skill. Use them as supporting reference when the workflow above feels too generic.

## Overview

A Messaging Service groups senders (phone numbers, short codes, toll-free numbers) with shared configuration. Send via `messagingServiceSid` instead of a specific `from` number — Twilio picks the best sender automatically.

**Use a Messaging Service for all production sends.** Beyond sender pools, it unlocks compliance toolkit, SMS pumping protection, link shortening, message scheduling, and intelligent alerts. For channel selection guidance, see `twilio-messaging-overview`.

---

## Prerequisites

- Twilio account with at least one SMS-capable phone number
  — New to Twilio? See `twilio-account-setup`
- Environment variables:
  - `TWILIO_ACCOUNT_SID`
  - `TWILIO_AUTH_TOKEN`
  — See `twilio-iam-auth-setup` for credential setup and best practices
- SDK: `pip install twilio` / `npm install twilio`

---

## Quickstart

**Python**
```python
import os
from twilio.rest import Client

client = Client(os.environ["TWILIO_ACCOUNT_SID"], os.environ["TWILIO_AUTH_TOKEN"])

# Step 1: Create the service
service = client.messaging.v1.services.create(
    friendly_name="Production Notifications Service"
)
print(service.sid)  # MGxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx — save as MESSAGING_SERVICE_SID

# Step 2: Add a phone number
client.messaging.v1 \
    .services(service.sid) \
    .phone_numbers \
    .create(phone_number_sid="PNxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx")

# Step 3: Send via the service
message = client.messages.create(
    messaging_service_sid=service.sid,
    to="+15558675310",
    body="Your order has shipped."
)
print(message.sid)
```

**Node.js**
```node
const twilio = require("twilio");
const client = twilio(process.env.TWILIO_ACCOUNT_SID, process.env.TWILIO_AUTH_TOKEN);

// Step 1: Create the service
const service = await client.messaging.v1.services.create({
    friendlyName: "Production Notifications Service",
});
console.log(service.sid);

// Step 2: Add a phone number
await client.messaging.v1
    .services(service.sid)
    .phoneNumbers.create({ phoneNumberSid: "PNxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" });

// Step 3: Send via the service
const message = await client.messages.create({
    messagingServiceSid: service.sid,
    to: "+15558675310",
    body: "Your order has shipped.",
});
console.log(message.sid);
```

---

## Key Patterns

### Create Service with Webhooks and Features