create_webhook_subscription

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

No annotations are provided, so the description carries the full burden of behavioral disclosure. It mentions subscribing and registering a callback URL, but does not describe side effects (e.g., creating a persistent subscription), whether duplicate URLs are rejected, authentication requirements, or how to undo the operation. This is a meaningful gap for a mutation-style tool.

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

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

The description is a single, focused sentence that conveys the core purpose without wasted words. It is front-loaded with the action and resource, making it easy to scan.

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

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

The tool is simple: two fully documented parameters, no nested objects, and an output schema is present. The description plus schema provides enough to understand what the tool does and how to invoke it. It is only missing richer usage-alternative and behavioral-context details, which are already penalized in their respective dimensions.

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

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

Schema description coverage is 100%, so the input schema already documents both parameters. The description does not add significant extra meaning beyond the schema; it only restates the callback URL concept already present in the url parameter description.

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

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

The description states a specific verb ('Subscribe') and resource ('OwnerRez events') and explains the mechanism ('registering an HTTPS callback URL'). It clearly distinguishes itself from the sibling list_webhook_subscriptions and delete_webhook_subscription tools by indicating this is the creation operation.

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

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

The description implies usage: use this when you want to receive OwnerRez event notifications via a callback URL. However, it provides no explicit guidance about when not to use it or how it relates to the sibling list/delete webhook subscription tools.

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