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

Annotations already declare readOnly, idempotent, closed-world, non-destructive behavior, so the safety profile is covered. The description adds useful context the annotations cannot: contents are ordered by reading sequence, are hierarchical (chapters and sections), and expose identifiers for downstream calls. It does not mention pagination or behavior for unknown/invalid slugs or a missing edition.

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 short sentences with zero filler; the return shape and ordering come first, followed by the argument's provenance. Every clause earns its place.

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 values need not be restated, and the workflow links to list_books and get_section are strong. However, for a tool whose schema has no descriptions, omitting the `edition` parameter entirely leaves a real gap.

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?

With 0% schema description coverage, the description must carry all parameter meaning, and it fully explains `book` as a slug from list_books with a concrete example. The second parameter, `edition`, is never mentioned, leaving half the surface undocumented in both schema and prose.

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 names the resource precisely (a book's chapters and sections, in reading order) and explains the payload carries IDs that get_section consumes, which distinguishes it from get_section itself. It lacks an explicit verb like "list" or "returns", but the intent is unmistakable.

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?

It states where the `book` argument comes from (list_books) and what to do with the result (pass IDs to get_section), giving a clear place in the workflow. It offers no explicit exclusions or when-not-to-use guidance versus search_books or get_section.

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