Claude Code plugins
2 plugins from public Claude Code marketplaces. Each one bundles skills, slash commands, agents, hooks or MCP servers that install together.
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Notification testing across email, SMS, push and webhooks: Mailpit inboxes, Twilio test numbers, FCM, APNs and Web Push, and signed webhook delivery. Covers in-app notifications and legacy MailHog in references, and both webhook senders and receivers. A critic agent (notification-delivery-critic) flags missing idempotency keys, bounce handling, and other delivery defects.
integrations-protocols
Send and diagnose transactional email through Twilio SendGrid from a terminal or agent: send messages, check deliverability (bounces and spam reports), and verify Signed Event Webhook signatures (ECDSA P-256) — with a bundled email-cli script that is read-only by default and gates every send behind a --dry-run/--yes confirmation. Use when an agent needs to send a transactional email, triage bounces or spam complaints, or confirm an inbound SendGrid webhook is authentic. Do not use for marketing or bulk email campaigns (that is SendGrid Marketing Campaigns), building email template systems, or other email providers (that is their own tooling).