get_book_pairings

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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and closed-world, so the safety profile is covered. The description adds that results are derived from co-shelving behavior (a recommendation signal, not authoritative metadata), but says nothing about ordering, pagination, or why 'pairings' differ from citations/similarity.

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?

A single tight sentence with the query concept front-loaded and a clarifying parenthetical; no filler, no repetition of schema details.

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 read-only lookup whose annotations carry the safety profile and whose schema fully documents inputs, this is nearly sufficient. The only real gap is not characterizing what a 'pairing' result contains or how it is ranked, which would matter given there is no output schema.

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% and both parameters (book_id, limit with default/min/max) are fully documented in the schema. The description adds no meaning beyond the schema, 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?

States a specific verb ('Find') and a precise relational resource ('books commonly co-shelved with a specific book'), which is meaningfully different from siblings like get_book_details or search_books. It does not explicitly name a sibling to contrast against, but the co-shelving framing makes the intent unambiguous.

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 only implied: the description conveys the recommendation/relatedness scenario but gives no explicit when-to-use, prerequisites, or alternative (e.g., 'use get_book_details for a single book's metadata'). An agent can infer the scenario but must guess at the boundary with siblings.

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