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

Annotations already declare readOnlyHint/idempotentHint/destructiveHint, but the description goes further and clarifies the exact mutation boundary: it writes nothing, never publishes and takes no payment, and the seller presses publish after signing in. That resolves the ambiguity of a tool that 'prepares' a listing but does not create one, which annotations alone could not convey.

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?

Purpose, output, sibling routing and the read-only/prerequisite caveats are front-loaded across four tight sentences with no filler. It is slightly dense and the TXT-record sentence runs long, but every sentence contributes information an agent needs.

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-value detail is not required, yet the description still previews the sell-page link, payment-record status and post-fee payout. Combined with the sibling pointer and the signing-in prerequisite, an agent has everything needed to call this correctly for a multi-name, non-publishing listing prep.

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% and the single nested parameter documents domain format and priceCents bounds in detail, so the schema carries the load. The description only restates the 1-to-20 cap and the notion of asking prices, adding the TXT-record precondition rather than extra parameter semantics.

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 (check up to 20 domains/prices for listing on this market) plus the concrete output (one sell-page link plus payment-record status and estimated payout). It explicitly contrasts itself with the sibling set_listing_terms, so an agent can distinguish the tools without opening either schema.

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?

Names the alternative tool and the condition that selects it: use set_listing_terms to change a name already listed, implying this tool is for preparing a new bulk listing. It also states a prerequisite (each name needs an _odvs-pay TXT record naming the seller's Square account), which is exactly the kind of gating condition an agent needs before invoking.

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