kjv_lookup

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

With no annotations, the description carries the full burden and does so: it discloses offline execution, absence of API key/network/cost, that the return is verse text only, and that unknown books/chapters/verses return an error. That covers the operational and failure profile an agent needs before calling.

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?

Four tight sentences: purpose and source first, then the operational guarantees, then accepted input forms, then the return/error behavior and sibling routing. No sentence is filler.

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?

One required parameter, no output schema, no annotations — and the description still closes the gaps by stating the return value ('verse text only'), error behavior, and call cost. An agent could invoke this correctly without opening the 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 coverage is 100%, so baseline would be 3, but the description adds real meaning beyond the schema by enumerating accepted reference forms: same-chapter ranges, numbered books ('1 John 4:8'), and common abbreviations ('Jn', 'Rom', '1 Cor'). It only omits edge-case details such as whitespace or case handling.

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 ('Look up a King James Version verse or same-chapter verse range') plus the source ('bundled public-domain KJV text'). It also explicitly distinguishes itself from the only sibling by declaring 'This is not a theological review; use arch_review for that.'

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?

Gives the positive case (verse/range lookup in KJV), an explicit exclusion with the named alternative ('use arch_review for that'), and the operating conditions ('Offline: no API key, no network call, and no charge'). The agent knows exactly when to pick this tool and when not to.

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