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

With no annotations, the description carries the burden and does add real behavioral context: it explains what detainableHint, demonstrate, and pack mean and how pack restricts results by ship type. It omits any statement about permissions, rate limits, or whether coverage is exhaustive, but it is plainly a read-only lookup so those gaps are minor.

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?

It is front-loaded: the resource and the 'call without area' rule come first, followed by the flag glossary. Dense but every clause conveys distinct information; the long parenthetical of ids is the only mildly heavy element.

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?

There is no output schema, so the description must explain return semantics, and it does so by defining the three item flags an agent will encounter. A brief note on return shape (e.g. whether items carry references or severity) would make it fully self-contained.

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%, so the baseline is 3, and the description earns above that by enumerating concrete area ids ('cert', 'crew', 'fire', 'lsa', 'nav', 'mach', 'pol1', 'ism', 'isps') and showing that title words like 'fire safety' also work. That adds usable matching guidance beyond the schema's generic 'Area id or words from its title'.

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 states a specific resource ('Port State Control preparation items') and its scoping dimension (one deficiency area), so an agent knows exactly what comes back. It doesn't explicitly contrast with the sibling tools inspection_deadlines or sire_question_lookup, but those cover clearly different domains, so confusion risk is low.

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?

It explicitly says 'Call without "area" to list the 24 areas', which gives a concrete entry path and defines the discovery-then-query workflow. It stops short of stating when another tool (e.g. inspection_deadlines) would be preferable, but the usage context is clear.

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