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

Annotations already cover the safety profile (readOnlyHint=false, idempotentHint=false, destructiveHint=false, openWorld=false). The description goes beyond them by disclosing the exact synthetic payload and the side effect that the result is recorded in failure_count / last_status_code — a non-obvious mutation of the webhook's health stats. It still doesn't say whether the test counts toward rate limits or affects real subscribers.

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?

Three tight sentences, front-loaded with what happens, then why, then the side effect. The trailing cost/group tags are boilerplate but short and clearly separated; nothing in the core prose is wasted.

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?

An output schema exists, so return values need not be explained, and annotations cover the safety profile. Between them the description covers action, payload, and side effect; the main lingering gap is cost, which is flagged as unknown rather than resolved.

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 `id`, `fields`, and `precision` are fully documented in the schema. The description adds only the framing that `id` resolves to a registered URL with a fixed payload; it says nothing about the compact-mode params, so 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 and resource: it fires a synthetic test delivery to the webhook's registered URL with a fixed `{"test": true}` payload. That distinguishes it from the list/get sibling `astroway_webhooks_id`, though no sibling is named explicitly and the registry of webhook tools is large.

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?

"Useful when validating endpoint signature handling" gives one genuine use case, but there is no when-not guidance (e.g. that this is a smoke test, not a real event trigger) and no mention of how it relates to siblings like `astroway_webhooks_subscribe` or the specific event webhooks. Usage is implied rather than routed.

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