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

Annotations already declare readOnlyHint and openWorldHint=false, so the description adds real value by disclosing the security posture: addresses are truncated to host only and signing secrets are never readable. It does not mention result limits or pagination for deliveries, which is the main remaining behavioral gap.

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 with no filler; the parenthetical about secrets is placed exactly where the redaction concern arises. Slightly over-compressed phrasing ('the events each hears') costs some immediate readability.

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, the description must carry the return shape, and it does indicate endpoints, their event subscriptions, and latest deliveries. It is silent on how many deliveries are returned and whether listing is paginated, which matters for an agent planning to inspect delivery history.

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 100% and documents the id format (wh_…), so the baseline would be 3. The description goes beyond the schema by explaining what the id changes in the response (that endpoint's latest deliveries), which the schema field alone does not convey.

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?

States a specific resource and scope: the link owner's webhook endpoints, the events each subscribes to, and optionally the latest deliveries for one endpoint. No sibling tool covers webhooks, so differentiation is unnecessary, but the sentence is dense and takes a second read to parse.

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 clause 'with an id, also that endpoint's latest deliveries' makes the two calling modes explicit: omit the id to list endpoints, pass it to drill into deliveries. No when-not-to-use guidance or sibling routing is given, but there is no overlapping alternative to route away from.

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