SenderKit MCP server

SenderKit Skills

Add transactional email, SMS, push, and web-push notifications to any app — straight from your AI coding agent. Portable AI-agent skills for SenderKit, packaged as a plugin for Claude Code, OpenAI Codex, Cursor, opencode, and other Agent Skills-compatible coding assistants.

SenderKit sends email, SMS, push, and web-push directly, and can also route through providers like Resend, SendGrid, Postmark, Mailgun, SES, Twilio, FCM, APNs, and Expo — so your app isn't locked into one vendor. These skills let an agent wire SenderKit into your codebase and operate it at runtime over MCP.

This repository contains one senderkit plugin with three related skills:

• senderkit-integration - add SenderKit to an app, or replace/route an existing email, SMS, or push provider through it.
• senderkit-mcp-messaging-operations - send and inspect messages at runtime through the SenderKit MCP connector.
• senderkit-email-deliverability - authenticate a sending domain (SPF/DKIM/DMARC) so email reaches the inbox.

What can I ask?

You don't need to name SenderKit — these skills activate on everyday messaging requests. Examples:

Rule of thumb: integration writes SenderKit into your code; messaging operations sends and inspects messages at runtime via MCP.

Install

This repo ships per-platform metadata — Claude Code (.claude-plugin/), OpenAI Codex (.codex-plugin/), Cursor (.cursor-plugin/), and opencode (opencode.json) — and the authored skills under ./skills/. Pick your agent below; each path ends with a quick check so you know it worked.

Any agent (skills CLI)

The skills CLI installs the skills into the right location for whichever agent you use (Claude Code, Codex, Cursor, opencode, and others):

npx skills add senderkit/senderkit-skills

It detects your agent, lists the three skills, and copies the ones you pick. This installs the skills only — to get the senderkit_* MCP tools, also connect the MCP server (see Connect the SenderKit MCP server).

Check it works: ask your agent "Use senderkit-integration to add a welcome email."

Claude Code

From the marketplace (recommended):

/plugin marketplace add senderkit/senderkit-skills
/plugin install senderkit@senderkit-skills

From a local checkout (for development):

claude --plugin-dir .

This loads both skills and the SenderKit MCP server from the repo's .mcp.json (OAuth, no key stored). Run /mcp, sign in, and pick a workspace and test/live mode.

Check it works: run /mcp — the senderkit server should be connected — or ask "Use senderkit-integration to add a welcome email."

OpenAI Codex

Shortened. The full README is on GitHub.