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-voice-outbound-callsgit 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-voice-outbound-calls)<a href="https://agentmods.dev/skills/twilio/ai/twilio-voice-outbound-calls"><img src="https://agentmods.dev/badge/skills/twilio/ai/twilio-voice-outbound-calls/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-voice-outbound-calls"><img src="https://agentmods.dev/badge/skills/twilio/ai/twilio-voice-outbound-calls.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 1 finding, up to medium
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- medium Data Exfiltration · line 190 Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.Fix: Verify the destination URL is trusted and necessary. Remove or replace with documented APIs. Ensure no secrets, tokens, or PII are transmitted.
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 | $0.00075 | $0.02611 |
| Opus 5 | $0.00037 | $0.01306 |
| Sonnet 5 | $0.00015 | $0.00522 |
| Haiku 4.5 | $0.00007 | $0.00261 |
Grade A, and why
twilio-voice-outbound-calls 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 — 303 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Overview
Agent safety: Before placing an outbound call, always confirm the recipient number and intent with the user. Outbound calls are irreversible and may incur charges. For automated systems, implement TCPA compliance: obtain prior express consent, respect quiet hours (8 AM–9 PM recipient local time), and maintain a Do Not Call list.
Every outbound call requires a from Twilio number, a to recipient, and TwiML instructions that define what happens when the call is answered — either as a webhook URL or inline.
Voice Platform Capabilities
Outbound calls go beyond basic calls.create(). Here's what you can build:
| Capability | How | When to use |
|---|---|---|
| Basic outbound call | calls.create() with TwiML or webhook URL |
Any outbound call — see Quickstart below |
| Answering Machine Detection (AMD) | machineDetection parameter on calls.create() |
Sales dialers, call campaigns — filter voicemail from humans |
| Conference-based agent bridging | <Dial><Conference> in TwiML |
Connect agents to live prospects with whisper, barge, hold |
| SIP Trunking | Elastic SIP Trunking | Bring your own carrier for outbound calls — cost reduction at scale |
| Call Recording | record=True on calls.create() or <Record> verb |
Compliance, QA, training |
| Voice Insights | Automatic per-call metrics | Call quality monitoring — latency, jitter, packet loss, answer rates |
| AI Voice Agents | ConversationRelay + LLM | Real-time speech recognition → LLM → TTS for conversational AI |
For TwiML verbs (Say, Gather, Dial, Record, Conference, Pay), see twilio-voice-twiml.
For AI voice agents, see twilio-voice-conversation-relay.
Prerequisites
- Twilio account with a voice-capable phone number
— New to Twilio? See
twilio-account-setupfor signup, getting a number, and trial limitations — Trial accounts can only call verified numbers - Environment variables:
TWILIO_ACCOUNT_SIDTWILIO_AUTH_TOKEN— Seetwilio-iam-auth-setupfor credential setup and best practices
- SDK:
pip install twilio/npm install twilio
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 · 303 lines · 75 tokens per session scan A 389ee1901e5d
twilio-voice-outbound-calls is a skill published in the GitHub repository twilio/ai (32 stars, last pushed 27d ago), licensed MIT. It adds 75 tokens to every session and 2,611 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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