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resend

Email Sending MCP

by resend

Create Template

create-template

Create a new email template in Resend using custom HTML with variables. Templates are created in draft status and can be published later.

Instructions

Create a new email template in Resend. Templates are created in draft status. Use publish-template to make them available for sending. Variables use triple-brace syntax in HTML: {{{VAR_NAME}}}.

Workflow: create-template → get-tiptap-json-content (with include_schema: true) → compose-template → publish-template.

Content options after creating:

  • compose-template (recommended): Sets TipTap content that the user can visually edit in the Resend dashboard. Use this when the user wants to collaborate on or refine the template in the editor.

  • update-template with html/text: Sets static HTML/text content. Use this only when the user explicitly wants to set raw HTML. Switching between compose and html/text modes is lossy — some content or formatting may be lost. Ask the user before switching.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
fromNoSender email address (e.g., "Your Name <sender@example.com>"). Can be overridden when sending.
htmlYesThe HTML content of the template. Use triple-brace syntax for variables: {{{VARIABLE_NAME}}}. Email HTML requirements — follow all of these without exception: STRUCTURE - Always include <!DOCTYPE html>, <html>, <head>, <body> - Layout must be table-based: <table>, <tr>, <td> — never use <div> for layout - Outer wrapper table at width="100%", inner content table at max 600px wide - Every table must have cellpadding="0" cellspacing="0" border="0" CSS - All styles must be inline (style="...") — no <style> tag, no external stylesheets - No flexbox, no grid, no CSS variables, no CSS shorthand (use padding-top not padding) - font-family must always include web-safe fallbacks (Arial, Helvetica, Georgia, sans-serif) - Always set font-size, line-height, and color explicitly on every text element IMAGES - Always set width, height, border="0", display:block on every <img> - Use absolute URLs only — no relative paths - Always include alt text LINKS & BUTTONS - Never use <button> — use <a> styled as a button inside a <td> - No <video>, <form>, or <input> elements - No JavaScript of any kind OUTLOOK COMPATIBILITY - Use bgcolor attribute on <td> alongside CSS background-color - No CSS background-image (poor Outlook support) - Add <!--[if mso]> conditionals where needed for Outlook rendering META (in <head>) - <meta charset="UTF-8"> - <meta name="viewport" content="width=device-width, initial-scale=1.0"> - <meta http-equiv="X-UA-Compatible" content="IE=edge">
nameYesThe name of the template.
textNoPlain text version of the message. If not provided, HTML will be used to generate it.
aliasNoAn alias for the template. Can be used instead of the ID to reference the template.
replyToNoDefault Reply-to email address(es). Can be overridden when sending.
subjectNoDefault email subject. Can be overridden when sending.
variablesNoArray of template variables (up to 50 per template).
Behavior4/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Given no annotations, the description covers key behaviors: templates created as draft, variable syntax, workflow steps, and content mode behavior. Lacks explicit error or limit info but sufficient for safe usage.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Well-structured with front-loaded purpose, status, syntax, workflow, and options. Slightly long due to HTML guideline details, but each section earns its place.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness5/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Comprehensive for a complex tool: covers creation status, workflow, variable syntax, HTML requirements, content mode switching, and parameter relationships. No output schema, but description compensates fully.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters5/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 100%, and the description adds significant value beyond schemas, such as variable naming conventions, reserved names, and exhaustive HTML requirements.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states 'Create a new email template in Resend', specifying the verb and resource. It distinguishes from sibling tools like publish-template and compose-template by explaining the workflow.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines5/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Explicitly provides a workflow and when to use alternatives: 'Use publish-template to make them available for sending' and explains content options with recommendations and warnings about lossy switching.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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