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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false, and openWorldHint=false, so safety and scope are covered. The description adds value beyond them by disclosing what is returned: catalogIds plus per-book library/wishlist status flags, which is important since there is no output schema. It omits result ordering and behavior on zero matches, keeping it below a 5.

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, zero filler, and the purpose is front-loaded before the return-value detail. Every clause carries information an agent needs.

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 two-parameter read-only search with strong annotations and no output schema, the description covers purpose, match fields, return contents, and downstream workflow. The remaining gap is the undocumented limit defaults and result ordering, which is minor but not negligible.

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 carry parameter meaning. It successfully explains that the query string matches title, author, or ISBN, which is real added meaning. However, the limit parameter (default 5, max 10) is not mentioned at all, leaving half the parameters undocumented anywhere.

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 verb and resource ('Search Readlink's book catalogue') and names the searchable fields (title, author, ISBN). It also distinguishes catalogue search from library listing by noting the results report library/wishlist membership, so an agent can tell it apart from siblings like list_library or get_book.

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 rather than stated: the phrase 'Returns catalogIds to use with the other tools' signals this is a discovery step that feeds get_book, add_book_to_library, and similar tools. However, there is no explicit when-to-use/when-not guidance, no mention of using list_library or list_wishlist instead when the reader already knows what they want.

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