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-rcs-messaginggit 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-rcs-messaging)<a href="https://agentmods.dev/skills/twilio/ai/twilio-rcs-messaging"><img src="https://agentmods.dev/badge/skills/twilio/ai/twilio-rcs-messaging/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-rcs-messaging"><img src="https://agentmods.dev/badge/skills/twilio/ai/twilio-rcs-messaging.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 | $0.00072 | $0.02290 |
| Opus 5 | $0.00036 | $0.01145 |
| Sonnet 5 | $0.00014 | $0.00458 |
| Haiku 4.5 | $0.00007 | $0.00229 |
Grade A, and why
twilio-rcs-messaging 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 10d 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 — 228 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Overview
RCS (Rich Communication Services) Business Messaging delivers branded, rich messages natively in the phone's default messaging app — no separate app needed. Messages show your brand logo, colors, and verified sender name. Supports rich cards, carousels, suggested actions, and media.
RCS uses the same messages.create() API as SMS and WhatsApp. For the full channel comparison and onboarding sequence, see twilio-messaging-overview.
Device Support
| Platform | Support | Notes |
|---|---|---|
| Android | Most devices via Google Messages | Carrier must also support RCS in the region |
| iOS | iOS 18+ | P2P RCS is not the same as RCS Business Messaging. A device that sends RCS to other people may not receive RCS Business Messages — this depends on both Apple and the carrier. Check via RcsCapabilityFetcher before sending. |
Regional Availability
RCS availability depends on carrier approval per country. See RCS regional availability for the current list. US carriers (T-Mobile, AT&T, Verizon) are supported. Global support is expanding.
Prerequisites
- Twilio paid account — free trials cannot use RCS
- Messaging Service (RCS senders must be added to a Messaging Service)
- Environment variables:
TWILIO_ACCOUNT_SID,TWILIO_AUTH_TOKEN— Seetwilio-iam-auth-setupfor credential setup - SDK:
pip install twilio/npm install twilio
Compliance Onboarding (US)
RCS onboarding takes 4-6 weeks minimum. A Twilio onboarding specialist reviews everything before carrier submission. You won't be charged until you go live.
Part 1: Sender Profile Setup
Create your RCS Sender in Console with:
| Asset | Requirements |
|---|---|
| Display name | Must be unique — carriers reject identical names + logos |
| Logo | 224x224px, max 50KB, PNG/JPEG |
| Banner | 1140x448px, max 200KB |
| Accent color | Hex code, must have 4.5:1 contrast ratio vs white |
| Description | What your business does and why you're messaging |
| Phone number | Customer support contact number |
| Website | Must match business identity |
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.
- 10d ago First seen · 228 lines · 72 tokens per session scan A 9754a2b3c332
twilio-rcs-messaging is a skill published in the GitHub repository twilio/ai (30 stars, last pushed 26d ago), licensed MIT. It adds 72 tokens to every session and 2,290 once invoked, about $0.0004 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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