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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint=false, so the safety profile is covered. The description adds one useful behavioral trait - output is chunked one line at a time and shaped for voice - but says nothing about ordering, how many cards exist, or whether reads are cached.

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?

It is short, but the opening repeats the title verbatim and the closing clause ('Bible: daily readings, plans, search and passage lookup (World English Bible)') is app-level scope that does not help select this specific tool. The redundant period and brand restatement are wasted tokens.

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?

Not applicable at the highest bar - scored 3: with annotations covering safety, a fully documented schema and no output schema, the definition is serviceable, but it leaves the central concept ('card', 'one line at a time') undefined and does not clarify its relationship to the sibling reading/today tools.

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%, with n, date and reading all documented in-schema (including defaults for card index, UTC day, and reading id from /readings). The description adds no parameter meaning beyond that, so the baseline of 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?

The description conveys that this returns today's reading 'one line at a time' as a swipeable card, which is more specific than a bare restatement of the name. However, it never explains what a 'card' is relative to the near-identical siblings bible_get_today, bible_get_reading and bible_get_passage, so an agent cannot easily tell which to pick.

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 only usage signal is the trailing phrase 'for voice', which hints at a text-to-speech context but is not framed as a when-to-use rule. There is no guidance on choosing this over bible_get_today or bible_get_reading, and no exclusions are stated.

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