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

Annotations already declare readOnlyHint=true and destructiveHint=false, covering the safety profile. The description adds the accepted identifier forms and the returned content, but it doesn't disclose behavior for invalid IDs, missing books, or pagination/format details. No contradiction with annotations.

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 efficient sentences: the first front-loads the core purpose and return content, the second covers input formats. No filler or redundant elaboration.

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?

For a simple single-parameter, read-only tool, the description plus annotations provide enough to call it correctly. It lists key return fields and accepted ID types, but it doesn't mention error/not-found behavior or clarify the relationship to get_my_book, which would round it out.

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 input schema describes the single 'id' parameter as 'A Siftivo work id, edition id, or URL slug' with 100% coverage. The description repeats this nearly verbatim, adding no new semantic detail, so the 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?

The description clearly states a specific verb+resource: 'Full detail for one book' and lists the returned fields. This distinguishes it from author/series/search siblings, but it doesn't explicitly differentiate from the similarly named 'get_my_book', so an agent might need to infer the public-catalog scope.

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: use this when you already have a work id, edition id, or slug and need full book details. However, there is no explicit guidance on when to prefer search_books for discovery or get_my_book for user-specific library data, and no exclusions are stated.

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