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

Annotations already cover the safety profile (readOnly, idempotent, non-destructive), and the description adds real behavioral detail beyond them: the substring matching rule, the explicit 'no match returns a count of zero' empty-state behavior, a hint at the return content (verse-page links, one summary file), and '[no key]' implying no auth is needed. This is useful context for a read tool.

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?

Tight and front-loaded with the resource at the start. It leans into telegraphic fragments ('One summary file.', '[no key]') that are low-waste but slightly cryptic, so it is efficient without being maximally clear.

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?

An output schema exists, so return values needn't be spelled out, and the description still adds the empty-result behavior and output flavor. For a single-parameter read tool with full annotations, this is close to complete, missing only the optional-parameter note and usage routing.

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 0%, so the description carries the burden, and it does explain the key semantic that 'theme is a case-insensitive substring'. However it omits that the parameter is optional (required:[]) and ignores the min/max length constraints, so it only partially compensates for the documentation gap.

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 description names a concrete resource ('Messianic rows from the connection files') and its output shape (links to OT and NT verse pages), so an agent knows it returns a curated prophecy list. The verb is implicit (retrieve) rather than stated, and it doesn't explicitly distinguish itself from the get_connections_* siblings, which share the 'connection files' phrasing.

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 when-to-use guidance and no mention of alternatives despite many plausible siblings (get_connections_by_book, get_cross_references, search). The 'theme' filter behavior is explained, but nothing tells the agent in what situation this tool is the right choice over those neighbors.

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