Add welcome emails to an app
Ask the agent to implement transactional email with Resend. The API skill covers single and batch sending, error handling, and idempotency keys for retries.
Overview
Resend Skills gives coding agents guidance for implementing email features, from API integration and React templates to delivery troubleshooting and inbox workflows. The plugin also connects supported clients to Resend’s hosted MCP server, so the agent can work with your email account as well as help write application code.
In Claude Code and Cursor, the agent can select relevant skills automatically, or you can choose one from the slash menu. The hosted MCP connection uses browser sign-in with Resend. Application code and CLI operations have separate API key requirements.
Use Cases
Build reusable email templates
Create welcome messages, password resets, or order confirmations with React components. The React Email skill covers template previews, HTML and plain-text rendering, and sending through Resend.
Investigate spam and delivery problems
Use the email guidance to review SPF, DKIM, and DMARC authentication, then examine bounce handling, suppression lists, and delivery events. It also covers consent and accessibility when reviewing an email feature.
Turn incoming mail into agent tasks
Build a support handler or email-to-task workflow that receives messages through Resend webhooks and replies in a thread. The inbox skill covers sender restrictions, webhook signature verification, and treating incoming content as untrusted input. Inbox reads and webhook registration require a full-access API key; a Sending access key is insufficient.
Manage email operations from the terminal
Have the agent use the Resend CLI to inspect emails, verify domains, manage contacts, or work with broadcasts. This requires the Resend CLI and a RESEND_API_KEY in the agent’s environment; installing the skill supplies guidance for those operations.
Components
Skills
This plugin's skills 5resend
Implement Resend API integrations for sending, receiving, and managing email resources.
resend-cli
Operate Resend from the terminal; requires the CLI and an API key.
email-best-practices
Review email authentication, delivery reliability, consent, bounce handling, and accessibility.
react-email
Build React email templates, preview them, and render HTML or plain text.
agent-email-inbox
Build inbound email workflows with sender restrictions and webhook signature verification.
MCP servers
1resend
Connect the agent to Resend to send emails and manage email resources.
Install
Claude Code
Add Resend’s marketplace, then install its Resend plugin with the bundled skills and hosted MCP connection.
- 01
In a Claude Code session, add the marketplace.
/plugin marketplace add resend/resend-skills - 02
Open the Resend plugin’s installation panel, choose its scope, and install it.
/plugin install resend@resend-skills - 03
Check the installation summary. If it requests a reload, close the panel to apply it. If activation remains pending, follow the reload guidance in the Claude Code installation docs.
- 04
Open MCP connections in Claude Code, select resend, and complete the browser sign-in to Resend. Review and approve the requested access.
/mcp - 05
Confirm resend appears in the Installed tab of the plugin panel. Type / in chat and look for its skills under the resend name.
/plugin
Resend also documents installation from Claude Code’s official marketplace. This installs the remote MCP server and Resend skills together.
- 06
In your terminal, install the Resend plugin.
claude plugin install resend@claude-plugins-official - 07
Start Claude Code. If a session is already open, run the reload command there to load the plugin.
/reload-plugins - 08
In Claude Code, open MCP connections and select resend to complete the Resend browser sign-in and approve access.
/mcp - 09
Type / in Claude Code chat and look for the plugin’s skills under resend. You can also check the plugin’s status from your terminal.
claude plugin list
Connect Claude on the web or desktop to Resend’s hosted MCP server. Claude skills are managed separately and require a paid plan with Code execution and file creation enabled.
How to connect
- 06
Open Customize > Connectors, select Discover, and search for Resend.
- 07
Open Resend and select Connect to Claude. Sign in to Resend and approve the requested access.
- 08
Return to Connectors and confirm Resend appears under Your connectors with the status Connected.
- 06
For the manual MCP-only alternative, Resend gives the path Settings > Connectors > Add custom connector. Enter the server URL below.
URLhttps://mcp.resend.com/mcp - 07
Complete the browser sign-in to Resend and approve the requested access.
- 08
Return to Connectors and confirm Resend appears under Your connectors with the status Connected.
Resend documents this Cursor chat command for installing its plugin, including the skills and hosted MCP connection.
- 06
Run the plugin command in Cursor’s chat and complete the installation.
/add-plugin resend - 07
When the MCP connection opens a browser, sign in to Resend and approve the requested access.
- 08
In Agent chat, type / and search for the Resend skills to confirm they are available.
Install Resend from the desktop app’s Plugins area to add its skills and hosted MCP connection. Plugins are unavailable in the Codex IDE extension.
- 06
In the desktop app, open Plugins, find Resend, and install it.
- 07
Start a new chat. When the Resend connection opens a browser, sign in to Resend and approve access.
- 08
Open Skills in the sidebar and confirm the Resend skills are listed.
Add the repository marketplace, then install its Resend plugin through the Codex CLI plugin browser. The marketplace command combines Codex’s documented syntax with Resend’s marketplace manifest.
- 06
In your terminal, add Resend’s marketplace.
codex plugin marketplace add resend/resend-skills - 07
In Codex CLI, open the plugin browser. Select resend from the resend-skills marketplace and install it.
/plugins - 08
Start a new Codex session to load the bundled skills and tools. Complete the Resend browser sign-in when prompted.
- 09
In the new session, list skills and confirm the Resend skills appear. Open the MCP view to check the Resend server.
/skills/mcp
Resend documents this command for installing and enabling its Hermes plugin with the skills and remote MCP server. For sending, supply RESEND_API_KEY when Hermes prompts on first use.
- 06
Run the installation command in your terminal.
hermes plugins install resend/resend-skills --enable - 07
Start a new Hermes session to load the enabled plugin.
- 08
In your terminal, confirm Resend is listed as enabled. In the new Hermes session, list skills and confirm the Resend skills are available.
hermes plugins list/skills list
Add the Resend plugin in Grok Bot to make its Resend skills available. Sending on your behalf requires RESEND_API_KEY.
- 06
Open Connect apps in the sidebar, search for Resend, and add it.
- 07
When the Bot requests RESEND_API_KEY, enter it through the secure secret card and save it securely. Keep the key out of ordinary chat.
- 08
Confirm Resend appears under Installed. The app’s tools are ready from the next message.