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Mailgun MCP Server

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by mailgun

post--v3-domains-domain-webhooks

Create webhooks for Mailgun domain events to receive notifications about email delivery status, opens, clicks, and user actions.

Instructions

Create a domain webhook

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
domainYes
idYesWebhook type to create. Valid types are `accepted`, `clicked`, `opened`, `unsubscribed`, `delivered`, `permanent_fail`, `temporary_fail`, `complained`
urlYesurl(s) for webhooks to be sent to. Use multiple times to associate more than one url. Maximum of 3 urls for a given webhook type.
Behavior2/5

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

No annotations are provided, so the description carries full burden. It states 'Create' implying a write operation, but doesn't disclose behavioral traits like authentication requirements, rate limits, side effects (e.g., if it overwrites existing webhooks), or response format. This is inadequate for a mutation tool with zero annotation coverage.

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?

The description is a single, efficient sentence with zero waste. It's appropriately sized and front-loaded, making it easy to parse quickly.

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?

Given the tool's complexity (a mutation with 3 required parameters), lack of annotations, and no output schema, the description is incomplete. It doesn't cover behavioral aspects, usage context, or output expectations, leaving significant gaps for an agent to understand the tool fully.

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 description coverage is 67% (2 out of 3 parameters have descriptions), so the schema provides good documentation. The description adds no parameter semantics beyond the schema, not explaining domain format, id enum details, or url usage constraints. Baseline 3 is appropriate as the schema does most of the work.

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

Purpose3/5

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

The description 'Create a domain webhook' clearly states the action (create) and resource (domain webhook), providing basic purpose. However, it lacks specificity about what a 'domain webhook' entails and doesn't differentiate from sibling tools like 'get--v3-domains-domain-webhooks' (which likely lists webhooks) or 'put--v3-domains-domain_name-webhooks-webhook_name' (which likely updates webhooks), making it vague in context.

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

Usage Guidelines2/5

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

The description provides no guidance on when to use this tool versus alternatives. It doesn't mention prerequisites (e.g., needing an existing domain), exclusions, or compare to sibling tools like 'put--v3-domains-domain_name-webhooks-webhook_name' for updates, leaving the agent without usage context.

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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