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

Annotations already cover read-only, idempotent, and non-destructive behavior. The description adds useful behavioral context by promising an unabridged, complete schema tree and alternate structures, which implies a verbose raw response. It does not contradict the annotations, though it does not discuss size or pagination.

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 concise sentences: the first front-loads the core behavior and scope, the second routes to the appropriate sibling. No filler or redundancy.

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 one-parameter read-only tool with strong annotations and clear sibling routing, the description is largely sufficient. The main gap is the unhelpful parameter documentation, but the overall tool is simple enough that the description provides adequate context for invocation.

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%, and the description does not explain the 'title' parameter beyond the resource context. The property name is self-explanatory, but with no schema descriptions and no compensatory guidance about title format or exact-match requirements, the parameter semantics are under-specified.

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: a full, unabridged index record for a book, and names the included components (schema tree, match templates, alternate structures). It also distinguishes itself from get_book_info, which is described as the friendly summary alternative, so an agent can select the correct sibling.

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 description explicitly says 'Use get_book_info for a friendly summary,' providing clear alternative guidance. It also implies the intended use case: call this when the raw, complete index record is needed rather than a summarized view.

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