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

Annotations already declare readOnly, idempotent, non-destructive and openWorld, so the safety profile is covered. The description adds the meaningful behavioral trait that output is delivered 'one line at a time', implying card-by-card paging, but it never says how many lines exist or how to detect the end, so the disclosure is partial.

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 first sentence is a verbatim copy of the title, and the second is an unrelated server blurb appended with a stray double period ('voice..'), so the text contains no unique information. It is short, but size here reflects duplication rather than discipline.

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?

No output schema exists, so the description carries the burden of explaining what a 'card' is and what is returned; it does not. An agent knows only that a paged line is returned, with no sense of ordering, boundary between cards, or relationship to the reading/plan ids from list_readings.

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 n, date and reading are already fully documented, including defaults and formats. The description's 'one line at a time' loosely corresponds to n but adds no syntax, range or interaction detail beyond the schema, so baseline 3 applies.

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?

States it returns today's reading broken into lines, which is slightly more specific than the title, but it never distinguishes itself from close siblings like get_reading and get_today. The second sentence is a server-level catalogue blurb ('Bible: daily readings, plans, search and passage lookup') rather than a statement of this tool's 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?

No when-to-use guidance and no alternatives named, despite four plausible sibling tools (get_reading, get_today, get_passage, list_readings) that an agent must choose between. 'for voice' hints at an intended consumer but does not tell the agent when this paged tool is preferable to get_reading.

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