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

Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, so the safety profile is fully covered. The description adds the return content detail ('books and chapter counts'), but no further behavioral traits like ordering, pagination, or error handling. This is adequate but not rich.

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?

A single, front-loaded sentence with zero wasted words. The verb and object appear immediately, and every word 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?

For a simple read-only listing tool with one optional parameter and no output schema, the description sufficiently states the return value (books and chapter counts). It could mention that translation codes are discoverable via bible_translations, but the tool is simple enough that this is a minor gap rather than a serious omission.

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 compensate for explaining the 'translation' parameter. The phrase 'for a translation' only echoes the parameter name and does not clarify accepted values, formats, or that the default is KJV. It adds essentially no meaning beyond the schema.

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 ('Return books and chapter counts') and a specific resource ('for a translation'), making the tool's job clear. It does not explicitly differentiate itself from siblings like bible_chapter or bible_verse, though the 'books and chapter counts' phrasing provides enough distinction to infer its listing role.

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 implies the use case: to enumerate the books of a translation and their chapter counts, as opposed to fetching a specific chapter or verse. However, it provides no explicit when-to-use guidance, exclusions, or reference to alternative siblings such as bible_translations for available translation codes.

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