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

Annotations already disclose the safety profile (readOnlyHint=false, destructiveHint=false, idempotentHint=false), so the description's added value is the seller-only authorization framing. It does not say what the link does downstream (notifies the wisher, reserves the listing), whether it can be undone, or that non-idempotent repeat calls may create duplicate links.

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?

A single clause with zero filler, front-loaded with the actor and the action. It is efficiently structured, though so terse that it leaves no room for the operational detail a mutation tool 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?

For a non-idempotent mutation with no output schema and 0% documented parameters, the description omits effect, reversibility, failure modes, and parameter constraints. An agent could guess the call from the parameter names, but not the consequences.

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 must carry the parameter burden. It only loosely maps the two entities ('your listing' -> listing_id, 'the wish it fulfils' -> wish_id) and gives no ID format, ownership constraint on the listing, or validity rules for the wish.

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 specific verb ('link') and both resources involved ('your listing', 'a wish it fulfils'), so the action is unambiguous. It does not, however, distinguish itself from near siblings like 'wish' or 'vote_wish', leaving the agent to infer the difference.

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?

The 'Seller:' prefix implies the caller role and therefore a precondition (you must own a listing), which is useful context. But there is no explicit when-to-use versus alternatives and no stated prerequisites such as 'the wish must be open' — usage is only implied.

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