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 fully covered. The description adds two real behavioral facts beyond that: results are relevance-ranked ('best match first') and the corpus is the World English Bible, but says nothing about result limits, pagination, or empty-match behavior.

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?

Two short sentences with the core action and ranking rule front-loaded and no wasted preamble. The trailing 'Bible: daily readings, plans, search and passage lookup (World English Bible)' is a slightly garbled scope list rather than a clean sentence, which costs a point but not readability.

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 ranked search whose annotations cover the full safety profile, the definition supplies corpus scope, ranking semantics and a documented query parameter. The only gap is return-shape guidance (how many hits, pagination), which is minor given the tool's simplicity and the absence of an output schema.

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%: the single 'q' parameter is documented in-schema with concrete examples ('forgiveness or shepherd'). The description adds no query syntax, phrase-quoting, or multi-word behavior beyond what the schema already provides, so the baseline 3 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 specific verb and resource (search the curated readings) plus a ranking behavior (best match first), so an agent knows this retrieves ranked matches rather than an enumerated list. However, it never distinguishes itself from siblings like list_readings (unranked) or get_reading (single item fetch), which is exactly the confusion this tool type invites.

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: the word 'search' plus 'best match first' tells the agent this is keyword lookup over readings, but there is no explicit when-to-use, no when-not, and no pointer to list_readings for browsing or get_reading for direct fetch. 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.