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 miles990/claude-software-skills --skill communication-systemsgit clone --depth 1 https://github.com/miles990/claude-software-skillsWrote 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/miles990/claude-software-skills/communication-systems)<a href="https://agentmods.dev/skills/miles990/claude-software-skills/communication-systems"><img src="https://agentmods.dev/badge/skills/miles990/claude-software-skills/communication-systems/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/miles990/claude-software-skills/communication-systems"><img src="https://agentmods.dev/badge/skills/miles990/claude-software-skills/communication-systems.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00012 | $0.02802 |
| Opus 5 | $0.00006 | $0.01401 |
| Sonnet 5 | $0.00002 | $0.00560 |
| Haiku 4.5 | $0.00001 | $0.00280 |
Grade A, and why
communication-systems scanned grade A with 1 finding 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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
const response = await fetch(webhook.url, { How it starts
The opening of the file, as written. The whole thing — 538 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Communication Systems
Overview
Building email systems, push notifications, in-app messaging, and webhook integrations.
Email Systems
Transactional Email
import { Resend } from 'resend';
const resend = new Resend(process.env.RESEND_API_KEY);
interface EmailOptions {
to: string | string[];
subject: string;
html?: string;
text?: string;
template?: string;
data?: Record<string, any>;
attachments?: Array<{
filename: string;
content: Buffer | string;
}>;
}
async function sendEmail(options: EmailOptions) {
let html = options.html;
// Use template if specified
if (options.template) {
html = await renderTemplate(options.template, options.data);
}
const { data, error } = await resend.emails.send({
from: '[email protected]',
to: options.to,
subject: options.subject,
html,
text: options.text,
attachments: options.attachments,
});
if (error) {
console.error('Email send failed:', error);
throw error;
}
// Log for tracking
await prisma.emailLog.create({
data: {
messageId: data.id,
to: Array.isArray(options.to) ? options.to.join(',') : options.to,
subject: options.subject,
template: options.template,
status: 'sent',
},
});
return data;
}
// Email templates with React Email
import { render } from '@react-email/render';
import { WelcomeEmail } from './templates/WelcomeEmail';
import { PasswordResetEmail } from './templates/PasswordResetEmail';
const templates = {
welcome: WelcomeEmail,
passwordReset: PasswordResetEmail,
};
async function renderTemplate(name: string, data: Record<string, any>) {
const Template = templates[name];
if (!Template) throw new Error(`Template ${name} not found`);
return render(<Template {...data} />);
}
// React Email template
import {
Html, Head, Body, Container, Text, Button, Img,
} from '@react-email/components';
function WelcomeEmail({ name, actionUrl }: { name: string; actionUrl: string }) {
return (
<Html>
<Head />
<Body style={{ fontFamily: 'Arial, sans-serif' }}>
<Container>
<Img src="https://example.com/logo.png" width="120" height="40" alt="Logo" />
<Text>Hi {name},</Text>
<Text>Welcome to our platform! Get started by setting up your account.</Text>
<Button
href={actionUrl}
style={{ background: '#007bff', color: '#fff', padding: '12px 24px' }}
>
Get Started
</Button>
</Container>
</Body>
</Html>
);
}
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 · 538 lines · 12 tokens per session scan A c8d6e1070aee
communication-systems is a skill published in the GitHub repository miles990/claude-software-skills (20 stars, last pushed 7mo ago), licensed MIT. It adds 12 tokens to every session and 2,802 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
Other skills, from other repositories
webhook-subscriptions
Webhook subscriptions: event-driven agent runs.
novu-manage-subscribers
Create, update, search, and delete subscribers in Novu. Manage topics for group-based notification targeting. Set subscriber credentials for push and chat channels. Use when managing notification recipients, creating subscriber records, organizing subscribers into topics, or configuring channel-specific credentials.
novu-trigger-notification
Trigger Novu notification workflows to send messages across email, SMS, push, chat, and in-app channels. Supports single triggers, bulk triggers, broadcast to all subscribers, topic-based targeting, and cancellation. Use when sending transactional notifications, alerts, or any event-driven messages.
novu-framework-integration
Build code-first notification workflows with @novu/framework. Use when defining workflows in TypeScript (Zod / JSON Schema / Class Validator), composing channel steps (email, SMS, push, chat, in-app) with action steps (delay, digest, custom), exposing Step Controls for non-technical teammates, rendering…
frontmcp-channels
Use when pushing real-time notifications or events into Claude Code (or another MCP client) sessions, or building two-way chat bridges. Covers channel source types: incoming webhooks (such as GitHub), app error events, agent-completion and job-completion alerts, service connectors, file watchers, and replay buffers…
email-connector
Use when wiring server code to send transactional or bulk email via Resend, SendGrid, or Postmark: a provider-agnostic sendEmail() seam, idempotent retries, 100-cap batches with partial failures, transactional-vs-broadcast streams, bounce webhooks feeding a suppression list. NOT SPF/DKIM/DMARC inbox reputation (that…