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

Annotations already cover the safety profile (readOnly, idempotent, non-destructive, closed-world), so the description earns credit for what it adds: the data's provenance (contact page, FAQ) and the scoping fact that only one set of hours exists. It does not discuss freshness or whether hours are static, which would have completed the behavioral picture.

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?

Two sentences, front-loaded with the resource and scope, with no filler. The topic enumeration (24/7, weekends, holidays) is slightly listy but earns its place by signalling query coverage; the negative office-hours clause is the most valuable sentence and comes last rather than first.

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, rich annotations, and no parameters, the description needs only to establish what the data is and what it is not, which it does. The absence of any note on how current or authoritative the published hours are is the only remaining gap for a lookup tool of this simplicity.

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?

The tool takes zero parameters, so the baseline is 4 and there are no parameter semantics to explain. The description correctly adds no spurious parameter discussion.

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 specific resource (gate and access hours) and a specific retrieval stance ("as the site publishes them"), so an agent knows this returns published hours rather than computing or negotiating them. It partially differentiates itself by pointing at the contact page and FAQ gate-hours answers as the source, though it does not name sibling tools like get_contact or search_faq directly.

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?

Usage is implied: ask this for gate hours, 24/7 and 24-hour access, weekends and holidays. The clause "it lists no separate office hours" is a useful negative signal that preempts an office-hours question, but there is no explicit routing guidance such as when to prefer get_contact or search_faq instead.

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