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

Annotations already declare readOnlyHint, openWorldHint, idempotentHint, and destructiveHint=false, covering the safety profile. The description adds 'current published text,' clarifying that drafts or superseded versions won't be returned, which is useful but modest. No contradiction.

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, front-loaded with the core purpose before the selection guidance. Every clause carries information — no filler, no repetition of the schema.

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 single-enum-parameter read-only tool with an output schema and full annotations, the description covers purpose and selection criteria completely. The only gap is disambiguating from the get_sources sibling, which a brief 'not' note would close.

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 coverage is 100% and the book parameter has an enum plus a description, so the baseline is 3. The description adds real value by mapping each book to its historical subject matter, letting an agent pick the correct enum value from a topic alone.

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 action and resource — 'Return the current published text of one of Spencer Hofmans' historical companion guides' — and clearly delineates the two books by topic. It doesn't explicitly distinguish this tool from siblings like get_sources, but the guide-vs-figure-vs-sources distinction is reasonably inferable.

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?

Gives explicit topic-based selection guidance for the two enum values — A Heart of Oak for United Irishmen/1798, A Younger Ireland for O'Connell/Repeal/Famine/1848 — which is clear when-to-use context for the parameter. However, it never addresses when to prefer a sibling tool like search_history or get_sources over this one.

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