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

The annotations already declare readOnlyHint, idempotentHint, destructiveHint=false, and openWorldHint=false, so the safety profile is fully covered elsewhere. The description adds nothing beyond that — notably it never says which translation/version the verse comes from or whether missing verses yield an error or empty result, which is the kind of context this tool actually needs.

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 no filler; every clause maps to a required parameter. It is appropriately sized for a simple lookup, though it could have spent the same space on the abbreviation constraint instead.

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 3-required-parameter lookup tool with no output schema and no annotations gaps, the definition is minimally sufficient — an agent can plausibly call it. The gaps are the valid-format requirement for bookAbbr and what a response contains, neither of which is recoverable from structured fields.

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 is doing real work by mapping the three parameters to book/chapter/verse number semantics. However, bookAbbr has no enum and no format hint — it does not state that a valid abbreviation (e.g., from alkitab_books) is required — so the highest-risk parameter remains ambiguous.

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 names a specific verb and resource ('Get a single Bible verse') and pins the exact lookup keys (book, chapter, verse number). The word 'single' distinguishes it in spirit from alkitab_passage or alkitab_search, though neither sibling is named.

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?

Usage is only implied: 'single' suggests one-verse retrieval rather than a range, which points away from alkitab_passage, but no explicit when-to-use or when-not-to-use rule is given. An agent must infer the choice between this and the passage/search siblings.

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