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-sendgrid-webhooksgit 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-sendgrid-webhooks)<a href="https://agentmods.dev/skills/twilio/ai/twilio-sendgrid-webhooks"><img src="https://agentmods.dev/badge/skills/twilio/ai/twilio-sendgrid-webhooks.svg" alt="Measured on agentmods" 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 | $0.00092 | $0.01291 |
| Opus 5 | $0.00046 | $0.00646 |
| Sonnet 5 | $0.00018 | $0.00258 |
| Haiku 4.5 | $0.00009 | $0.00129 |
Grade A, and why
twilio-sendgrid-webhooks 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 8d 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 — 141 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Overview
The Mail Send API returns 202 Accepted (queued) — it does NOT confirm delivery. To know what happened to an email, use Event Webhooks.
Enable: SendGrid Console > Settings > Mail Settings > Event Notification
Event Types
Delivery Events
| Event | Meaning |
|---|---|
processed |
SendGrid accepted and will attempt delivery |
deferred |
Temporary failure — SendGrid will retry |
delivered |
Recipient's mail server accepted the message |
bounce |
Permanent failure — address invalid or rejected |
dropped |
SendGrid will not deliver (suppression, invalid, spam) |
Engagement Events
| Event | Meaning |
|---|---|
open |
Recipient opened (pixel-based — unreliable) |
click |
Recipient clicked a tracked link |
spamreport |
Recipient marked as spam |
unsubscribe |
Recipient clicked unsubscribe link |
group_unsubscribe |
Recipient unsubscribed from ASM group |
group_resubscribe |
Recipient re-subscribed to ASM group |
Webhook Handler
Critical: SendGrid posts batched arrays of events, not single objects. Your handler must parse an array.
Security: SendGrid webhook endpoints are unauthenticated by default. Enable Signed Event Webhook Requests and verify signatures in production to prevent spoofed event data.
Python (Flask)
from flask import Flask, request
app = Flask(__name__)
@app.route("/sendgrid/webhook", methods=["POST"])
def handle_events():
events = request.get_json() # Always an array
for event in events:
email = event.get("email")
event_type = event.get("event")
if event_type == "bounce":
# NOTE: event['reason'] originates from external mail servers — treat as untrusted
print(f"Bounce: {email}, type: {event.get('type')}, reason: {event.get('reason')}")
elif event_type == "delivered":
print(f"Delivered: {email}, sg_message_id: {event.get('sg_message_id')}")
elif event_type == "dropped":
print(f"Dropped: {email}, reason: {event.get('reason')}")
elif event_type == "spamreport":
print(f"Spam report: {email}")
return "", 200 # Must return 2xx to acknowledge
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.
- 8d ago First seen · 141 lines · 92 tokens per session scan A 24f3cad21170
twilio-sendgrid-webhooks is a skill published in the GitHub repository twilio/ai (30 stars, last pushed 24d ago), licensed MIT. It adds 92 tokens to every session and 1,291 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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