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

Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false, and openWorldHint=false, so the safety profile is fully covered. The description adds that the translation is the World English Bible, which is genuine context, but says nothing about return shape, verse numbering, or reference parsing behavior.

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 short sentences with the resource and scope front-loaded and no filler. The marketing-style opener 'Bible Swipe' consumes space without adding information, but the remainder is efficient.

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 single-parameter, read-only lookup with full annotation coverage and no output schema, the description supplies the translation and valid reference formats. It still leaves open book-naming conventions (full name vs abbreviation) and what a returned passage looks like, so it is adequate but not complete.

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 coverage is 100% and there is only one parameter, so the baseline is 3. The description goes beyond the schema's single 'John 3:16' example by enumerating the accepted reference forms (single verse, range, whole chapter, cross-chapter range such as Genesis 1:1-2:3), which materially expands what the agent knows it can pass.

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 identifies the resource precisely (a Bible passage, any verse/range/chapter, World English Bible translation) and the scope of accepted references. The verb is only implied by the tool name, and nothing distinguishes it from siblings like bible_get_reading, bible_get_card, or bible_get_today.

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 implied: you call it when you want a specific passage by reference, and the listed reference shapes (verse, range, chapter, cross-chapter) tell the agent what it accepts. However, there is no explicit when-to-use guidance and no mention of the sibling read tools an agent might otherwise pick.

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