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

Annotations already declare readOnlyHint, idempotentHint, openWorldHint and destructiveHint=false, so the safety profile is fully covered. The description adds only the vague 'read a passage at a time' framing and says nothing about the shape, ordering, or size of the returned book list. It neither contradicts the annotations nor meaningfully enriches them.

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?

The text is largely redundant: the same idea ('the whole books in the Library that can be read a passage at a time') appears twice, and the final sentence restates it a third time while dumping unrelated feature names. It is not overly long, but almost none of it 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 zero-parameter list tool with no output schema, the bar is low, but the description leaves the agent unsure whether this is the book index or a passage reader, since it also mentions 'daily shabad, plans, search, Ang and shabad lookup'. That scope muddle is exactly the kind of ambiguity the description should resolve.

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 input schema defines zero parameters, so there is nothing for the description to disambiguate. Baseline 4 applies for a no-argument tool.

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 does convey that this returns whole books in the Library that can be read a passage at a time, which is a concrete resource. However, the leading verb 'Scroll' is odd and non-standard for a list operation, and the definition never distinguishes itself from close siblings like gurbani_read_book or gurbani_list_readings. It largely restates the title twice rather than sharpening the purpose.

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?

There is no statement of when to call this versus gurbani_read_book, gurbani_list_readings, or the equivalent gita_/lore_/stoics_ list tools. The trailing phrase 'Gurbani: daily shabad, plans, search, Ang and shabad lookup' name-drops other capabilities without routing the agent to the right tool, which adds noise rather than guidance.

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