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

Annotations already declare destructiveHint=true, idempotentHint=false, and readOnlyHint=false, so the general risk profile is covered. The description adds genuinely non-redundant behavior: secrets are returned only for create and rotate, and the operation requires the user's confirmation. It still does not say what delete destroys or whether any operation is reversible.

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?

A single front-loaded sentence lists the operations first, then the two most important behavioral notes (secret exposure, confirmation). It is dense but every clause carries information; slight readability cost comes from the long comma-separated action list.

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?

With no output schema and a destructive 8-parameter tool, the description does enough: it covers the confirmation handshake, secret return scope, and full action set. Missing details are what delete removes and any delivery-listing behavior, but an agent can call the tool correctly from what is given.

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 coverage is 63% with 8 parameters, so the schema documents most of the semantics (url, events, webhook_id, delivery_id, confirmation_token). The description adds only the create/rotate secret behavior and does not clarify the undocumented label or categories parameters, so it neither compensates for the gap nor falls below the 3 baseline.

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 names a concrete resource (webhook destination) and enumerates the exact operations it performs (create, update, pause, resume, rotate_secret, test, retry_delivery, delete), which matches the action enum precisely. The only gap is that it does not differentiate itself from the sibling create_webhook, so an agent cannot tell from the text alone which tool to pick for creation.

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?

It anchors usage to a known surface ('the same operations as Dashboard → Developer API') and flags the confirmation requirement, which implies when it is appropriate. However, it never states when NOT to use it or how it relates to create_webhook/list_webhooks, leaving the create path ambiguous across siblings.

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