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SenderKit Skills is an open-source plugin that teaches an AI coding agent how to work with SenderKit. Install it once and your agent can add transactional email, SMS, push, and web-push to your codebase — and send, inspect, and manage messages at runtime — without you spelling out the API every time. It’s portable: the same plugin runs in Claude Code, OpenAI Codex, Cursor, and other Agent Skills-compatible assistants.
This is different from the two other AI integrations in these docs. The MCP server is the connection an agent calls SenderKit through; the AI-agent guide gives your own app’s agent a send tool. The skills plugin is the layer that makes a coding agent good at both — it ships the know-how, and bundles the MCP server so runtime sends work out of the box.

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The two skills

The plugin contains one senderkit plugin with two skills. They split along a single line: does the agent change your code, or operate SenderKit at runtime?

senderkit-integration

Writes SenderKit into your app. Detects your stack, adds SenderKit behind a small local wrapper, migrates an existing provider (Resend, SendGrid, Postmark, Mailgun, SES, SMTP, Twilio, FCM, APNs, Expo) or routes through it, and verifies in test mode before live traffic.

senderkit-mcp-messaging-operations

Operates SenderKit at runtime over MCP. Sends templated or raw messages, lists and inspects messages, drafts templates, and cancels pending sends — without touching code.
You don’t have to name the skills — they activate on everyday messaging requests.

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Install

Install from the marketplace:
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.Developing against a local checkout instead:
Check it works: run /mcp — the senderkit server should be connected — or ask “Use senderkit-integration to add a welcome email.”
Installing the plugin gives you the senderkit_* MCP tools, but auth differs by client: Claude Code uses OAuth (no key stored); Codex and Cursor use an API key via SENDERKIT_API_KEY. For every other client, manual config, and self-hosting, see MCP installation. Start with an sk_test_ key so a coding agent can’t send to real people until you trust it.

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What’s next

MCP Server

The connection the messaging-operations skill rides on — tools and modes.

MCP installation

Connect the MCP server in any client, including manual config.

Send from your AI agent

The other direction — give your app’s own agent a send tool.

MCP tools

Every tool the messaging-operations skill can call.