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

Annotations already declare that this is not read-only, is open-world, not idempotent, and not destructive. The description adds valuable context beyond that: the delivery is signed, it is queued (asynchronous), and it sends a webhook.test event type rather than a real payload. It doesn't cover retries or rate limits, but it meaningfully extends what the annotations provide.

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 wasted words. The verb, resource, and purpose appear in the first clause, and the qualifying phrase joins naturally without padding.

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 an output schema present and annotations covering the safety profile, the description only needs to explain the special test semantics, which it does: signed, queued, and test event type. It stops short of describing what happens on delivery failure or how the endpoint is selected, but an agent has enough to call it correctly.

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%, and the single 'id' parameter is documented as 'The webhook id.' The description doesn't add syntax or format details for the parameter, so the schema is doing the work here. Baseline 3 applies.

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 verb ('Queue') and resource ('signed webhook.test delivery to one of your endpoints') and its purpose ('to check it before a real outcome arrives'). This clearly separates it from create_webhook, delete_webhook, and list_webhooks, which deal with webhook configuration rather than a test delivery.

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 'to check it before a real outcome arrives' gives a clear use condition: validating an endpoint before real events flow. It doesn't explicitly name alternatives or state when not to use it, but the context is strong enough that an agent can infer the right moment.

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