get_book_by_slug

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

There are no annotations, so the description itself must convey behavior. It implies a safe read-only operation returning full details, but it does not disclose potential edge cases such as invalid or unknown slugs, response shape limitations, or whether any augmentation/fallback occurs.

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?

One compact sentence with an inline example; no wasted words and the key constraint ('by URL slug') is front-loaded.

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 lookup tool, the description is largely complete and would let an agent call it correctly. It could be slightly richer about the returned object or error/absence behavior, but the complexity here is low.

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 schema already covers the slug parameter, and the description adds meaningful detail by explaining that it is a Hardcover URL slug and giving a realistic example. This supports correct parameter formatting and extraction.

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 the action (get), resource (full book details), and lookup key (Hardcover URL slug), with a concrete example. It is easy to understand what the tool does, though it does not explicitly distinguish itself from get_book_by_id.

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?

The condition for use is clear: call this tool when you have a Hardcover URL slug and want full book details. It does not explicitly describe when to prefer get_book_by_id or other lookup tools, but the slug-based scope is evident.

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