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resend

Email Sending MCP

by resend

Create Webhook

create-webhook

Set up a webhook to receive real-time notifications about email events such as sent, delivered, or bounced at a specified URL.

Instructions

Create a new webhook in Resend. A webhook allows you to receive notifications at a specified URL when certain events occur (e.g. email.sent, email.delivered, email.bounced).

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
eventsYesArray of event types to subscribe to
endpointYesThe URL where webhook events will be sent
Behavior2/5

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

With no annotations, description carries full burden. It explains what a webhook does (receive event notifications) but fails to disclose side effects (immediate activation), authentication requirements, rate limits, or post-creation behavior. Minimal behavioral info.

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

Conciseness5/5

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

Two sentences, no redundancy, front-loaded with action. Every sentence adds value without waste.

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

Completeness2/5

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

No output schema and no description of return value (e.g., webhook ID). Missing info on immediate effects, event delivery guarantees, or confirmation. Incomplete for a creation tool.

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

Parameters3/5

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

Schema coverage is 100%, so description adds minimal value. It gives example events but does not elaborate on parameter formats, constraints, or interplay beyond schema. Baseline score applies.

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?

Description clearly states 'Create a new webhook in Resend' with specific verb and resource, and distinguishes from sibling tools like get-webhook, update-webhook, remove-webhook by focusing on creation.

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

Usage Guidelines3/5

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

Description implicitly suggests using this tool when a new webhook is needed, but lacks explicit guidance on when not to use or when to prefer alternatives. No mention of prerequisites or exclusions.

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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