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

Annotations already declare readOnlyHint, idempotentHint, openWorldHint, and destructiveHint=false, so the safety profile is covered. The description adds the useful corpus fact that the text is the World English Bible, but says nothing about behavior for invalid references, formatting of returned verses, or error handling.

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?

One compact sentence with zero filler and the scope information front-loaded. It is arguably too terse given the missing verb and routing guidance, but nothing in it is wasted.

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 tool with a complete schema and annotations covering safety, this is minimally adequate. It still leaves gaps an agent would want: whether the output includes verse numbers, what book-name format is expected, and what happens on an unresolvable reference.

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 the schema supplies an example ("John 3:16"), so the baseline would be 3. The description earns an extra point by clarifying that the single 'ref' parameter accepts chapters and cross-chapter ranges (Genesis 1:1-2:3), not just single verses as the schema example suggests.

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 resource (a passage of the World English Bible) and enumerates the accepted scope (verse, range, chapter, cross-chapter range) with a concrete example. It is a noun phrase rather than a verb phrase and offers no explicit differentiation from siblings like get_reading, so it is clear but stops short of a 5.

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 no statement of when to use this tool versus get_reading, get_today, or search_readings, and no mention of prerequisites or exclusion conditions. The agent must infer routing from the tool name alone.

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