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

With no annotations, the description carries the burden and does well: it discloses ordering (newest first), the fields returned, the authorization scope (owner or office), and the important limitation that no download link is produced here. Pagination/default behavior of the result set is the main unstated trait.

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 dense clauses, front-loaded with the access scope and resource, with zero filler. The colon-chained telegraphic style is efficient but slightly harder to parse than plain sentences.

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 shape needn't be spelled out, and the description still names key fields. For a two-parameter read tool, the only meaningful gap is how limit affects the result set.

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 0%, so the description must compensate. shop_id is self-evident from the phrase 'the shop's', and 'newest first' hints at ordering, but the limit parameter's meaning, default, and paging behavior are explained nowhere.

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 the specific resource (the shop's past books exports) and the returned fields (period, row counts, sha256), and implicitly contrasts with books_export for downloads. The listing verb is only implied, but the resource and scope are unambiguous and separable from the sibling.

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?

Gives a concrete use case (verify a file you were sent via sha256) and explicitly routes to books.export when a fresh download link is needed, plus an access condition ('Owner or office'). It doesn't state exclusions beyond that, so it stops short of a full 5.

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