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

Annotations already declare readOnlyHint and openWorldHint, so the safety profile is covered. The description goes beyond that by disclosing the exact return contents — status codes, retries, dead letters, capped at 20 attempts — which is the main behavioral fact an agent needs. It does not say what happens if the webhook_id is unknown or whether dead letters imply action.

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 return contents and the tool's role are both stated compactly.

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 takes on the burden of describing returns and does so concretely, including the 20-attempt cap. What remains thin is error behavior and whether the delivery list is paginated or filterable.

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?

Only one parameter and the schema already documents it at 100% coverage, including the pointer to list_webhooks for discovery. The description adds no further meaning about the id format or scope, which is acceptable given the schema carries it but earns only the 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?

States a specific resource (one webhook) plus the payload it returns (last 20 delivery attempts with status codes, retries, dead letters). The word 'One' implicitly contrasts with list_webhooks, though the sibling is never named, so an agent must infer the singular-vs-list split.

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 phrase 'the delivery debugging surface' implies when to reach for this tool (investigating failed deliveries), but there is no explicit when-not guidance and no mention of test_webhook or list_webhooks as alternatives for adjacent tasks.

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