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

With no annotations, the description carries the load: 'Find' implies a read-only operation, and it usefully discloses the return shape (quotation plus link). However, it says nothing about result volume, pagination, ordering, or empty-result behavior for a lookup that could return many authors.

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 dense sentence with the verb and scope front-loaded and no filler. The parenthetical author list earns its place by scoping what 'shelf' means, though 'shelf' remains jargon not defined elsewhere in the description.

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 simple lookup with no output schema, the description covers what it does and what comes back (quotation plus link). The main gap is behavioral detail on result sets and coverage, but the essential call information is present.

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?

Single required parameter with 100% schema description coverage, so the schema already carries format guidance with examples. The description adds only the domain framing that 'ref' is a Bible verse, which is baseline for a one-param tool.

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?

Names a specific verb and resource (find who quotes a given Bible verse) and clarifies the scope of the 'shelf' with a parenthetical list of author categories. It implicitly distinguishes itself from get_passage/read_work, but never names those siblings to route the agent explicitly.

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: pass a verse reference and get back quoters. There is no guidance on when to prefer this over get_passage (reading the verse) or search_shelf, and no note about coverage limits or what happens when no one quotes the verse.

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