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

Annotations already declare readOnly, idempotent, non-destructive, closed-world, so safety is covered. The description's 'follow next ... it carries on into the next chapter' hints that the response exposes a continuation pointer across chapter boundaries, which is genuine behavioral context not in the annotations, though it is stated obliquely and never explains what a returned passage contains.

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, but the second is a semicolon-laden feature dump spanning unrelated tool domains, and the actual 'read a passage at a time' purpose arrives last instead of being front-loaded. The title sentence duplicates the first sentence of the description.

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?

With no output schema, the description must explain the return value, yet it only alludes to a 'next' pointer and never says what a passage looks like, how the sequence terminates, or how ref/section/n interact at return time. It also fails to clarify boundaries against the many sibling reading tools, leaving selection ambiguous.

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 100%, so book, section, n, and ref are each fully documented in the schema (including the ref examples and the Bekhorot/Daf Yomi default). The description adds nothing to parameter meaning, so the baseline 3 is warranted.

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 opening sentence, 'Follow next for the next passage; it carries on into the next chapter,' describes a navigation/pagination behavior rather than the tool's action, and the second sentence lumps in sibling domains (daily shabad, plans, search, Ang and shabad lookup) plus the actual purpose ('read a passage at a time'). An agent cannot cleanly tell whether read_book reads a book passage or wraps get_ang/get_shabad/get_today, so the purpose is muddled rather than specific.

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 a weak usage hint ('follow next for the next passage'), but no statement of when this tool is preferred over get_ang, get_shabad, get_today, get_reading, or search_readings. Worse, enumerating those sibling capabilities inside this description implies read_book covers them, which actively misleads selection.

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