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

Annotations already declare readOnlyHint=true, idempotentHint=true, openWorldHint=true and destructiveHint=false, so the safety profile is covered. The description adds only 'line by line' (output granularity) and identifies the translation (World English Bible); it says nothing about error behavior when an id is not found or about the shape of the returned lines.

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?

Very short and front-loaded: the core purpose leads, with the domain qualifier trailing. The second sentence is somewhat vague and reads like a category label rather than useful instruction, but there is no padding.

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?

With one fully documented required parameter and annotations covering the safety/idempotency profile, the essentials are present. But with no output schema, the description should do more to explain what 'line by line' actually returns, especially for plans versus readings, which are plausibly different payloads.

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 description coverage is 100% and the single 'id' parameter is fully documented in the schema, including that it can be a plan name such as 'japji'. The description adds no parameter detail beyond that, so the baseline 3 for high coverage applies.

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 first sentence states a retrievable resource ('one reading or plan') with output granularity ('line by line'), which is reasonably specific. However, the second sentence ('Bible: daily readings, plans, search and passage lookup') is a domain tagline that describes capabilities belonging to siblings like search_readings and get_passage, muddying rather than sharpening the tool's distinct purpose.

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 guidance on when to call get_reading versus list_readings, search_readings, get_passage, or get_today. The schema hint about ids coming from list_readings implies a workflow, but the description itself gives no explicit when-to-use or when-not-to-use context.

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