Twilio for AI provides coding agents with skills and an MCP server for using Twilio services and documentation. The MCP server searches Twilio documentation and API specifications and retrieves full schemas for selected operations, while the skills supply procedural guidance to agents. Its catalogue add-ons are intended for Claude Code, Cursor, Codex, and other tools that support the Agent Skills standard.
Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add twilio/ai --skill twilio-verify-send-otpgit clone --depth 1 https://github.com/twilio/aiWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/twilio/ai/twilio-verify-send-otp)<a href="https://agentmods.dev/skills/twilio/ai/twilio-verify-send-otp"><img src="https://agentmods.dev/badge/skills/twilio/ai/twilio-verify-send-otp/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/twilio/ai/twilio-verify-send-otp"><img src="https://agentmods.dev/badge/skills/twilio/ai/twilio-verify-send-otp.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00102 | $0.02600 |
| Opus 5 | $0.00051 | $0.01300 |
| Sonnet 5 | $0.00020 | $0.00520 |
| Haiku 4.5 | $0.00010 | $0.00260 |
Grade A, and why
twilio-verify-send-otp scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 11d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 274 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Overview
Use Twilio Verify to manage the full OTP lifecycle: code generation, delivery, expiry, rate limiting, and Fraud Guard protection. Use the Programmable Messaging API to build your own OTP message infrastructure and access features such as SMS Pumping Protection.
| Twilio Verify | Programmable Messaging API | |
|---|---|---|
| Code generation + expiry | Built-in (10min default, configurable). Also supports custom codes. | Build yourself |
| Rate limiting | Built-in (per-phone, per-service) | Build yourself |
| Fraud protection | Fraud Guard (geo-permissions, rate anomaly) | SMS Pumping Protection |
| A2P registration | Exempt — no 10DLC needed | Required — must register campaign |
| Multi-channel | One API, change channel param (SMS/Voice/Email/WhatsApp) |
Separate integration per channel |
| Cost | Per confirmed verification + channel fee | Per-message pricing + build cost |
| Delivery confirmation | Yes — via List Attempts or Events API | Yes (via StatusCallback) |
When Programmable Messaging is justified: You need full control over message content, custom delivery logic, or SMS Pumping Protection features. For standard OTP/2FA flows, use Verify.
Verify supports SMS, voice, email, and WhatsApp — only the channel parameter changes per delivery method. RCS is not a channel value: Verify automatically upgrades an sms verification to RCS where the device supports it and falls back to SMS. TOTP (authenticator apps) is supported via the Verify Factors API, a separate implementation from channel-based OTP.
Prerequisites
- Twilio account (free trial works for testing)
— New to Twilio? See
twilio-account-setup— Verify requires no separate product activation — just create a Service below - Environment variables:
TWILIO_ACCOUNT_SIDTWILIO_AUTH_TOKENVERIFY_SERVICE_SID(created in Quickstart step 1) — Seetwilio-iam-auth-setupfor credential setup and best practices
- SDK:
pip install twilio/npm install twilio - For WhatsApp channel only: a registered production WhatsApp sender — see
twilio-whatsapp-manage-senders
What ships with it
3 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 11d ago First seen · 274 lines · 102 tokens per session scan A d429cf42cef8
twilio-verify-send-otp is a skill published in the GitHub repository twilio/ai (32 stars, last pushed 26d ago), licensed MIT. It adds 102 tokens to every session and 2,600 once invoked, about $0.0005 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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