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 elsewhere. The description adds nothing behavioral beyond that — no note on ordering, completeness of the returned canon, or what an invalid testament yields.

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 front-loaded sentence: verb, resource, scope, then the value glossary. Nothing is padded and the actionable information precedes the parenthetical expansions.

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 one-parameter read-only tool this covers the invocation decision, but with no output schema the description would need to say what a "book" entry looks like (name, id, chapter/verse counts) for an agent to use the result downstream. That return-shape gap is the main omission.

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 0% and the enum values alone ("PL", "PB") are opaque Indonesian abbreviations, so the description's glosses "Perjanjian Lama / Old Testament" and "Perjanjian Baru / New Testament" are genuinely necessary to select correctly. It stops short of covering the single required-parameter constraint or default behavior, but it fully disambiguates the enum.

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 Bible books") plus the scoping dimension ("filtered by testament"), which distinguishes it from the unfiltered sibling alkitab_books by implication. It never names the sibling explicitly, so an agent must infer the alternative.

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 by the word "filtered" and the enumeration of the two accepted values, so an agent can infer this is the testament-scoped variant of alkitab_books. There is no explicit statement of when to prefer it over alkitab_books, nor any exclusion or prerequisite.

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