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 fully covered and the description needn't repeat it. The description adds two useful facts not in annotations — a stable count of 66 and the Indonesian translation — but says nothing about what a returned book entry contains, which matters since there is no output schema.

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 short sentence that front-loads the action and the resource. No filler, no restatement of the title, nothing to trim.

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 zero-parameter, no-output-schema tool the description covers the essentials, but it omits the one thing an agent needs downstream: what identifier a listed book exposes for use with alkitab_passage or alkitab_verse. Without that, the agent must call the tool to discover whether books come back as names, numbers, or slugs.

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?

The tool takes zero parameters, so per the baseline this scores 4. There is nothing for the description to clarify about inputs, and it does not confuse matters by implying hidden options.

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 a specific verb and resource ("List all 66 books of the Bible") plus a scope qualifier (Indonesian translation), which is enough to understand the tool at a glance. It does not distinguish itself from the sibling alkitab_books_by_testament, which likely returns a similar thing partitioned differently, so it falls 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?

Usage is only implied by the purpose: an agent can infer it should call this to enumerate books. There is no explicit when-to-use versus alkitab_books_by_testament, nor any statement that this returns all books rather than a filtered subset, leaving the choice between the two listing tools to guesswork.

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