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

Annotations already declare destructiveHint=true, idempotentHint=false and openWorldHint=true, so the safety profile is covered. The description adds non-obvious context the annotations cannot: any caller may invoke it on an expired auction, and the side effect is that the winner receives an order. It omits whether a takedown is reversible or what happens to pending bids/offers.

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 dense sentence that front-loads the primary action and appends the auction-close variant plus its side effect. No filler, though the parenthetical is doing a lot of compressed work.

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 destructive, non-idempotent mutation with no output schema and an undocumented parameter, the description covers the core action and one key side effect. It leaves gaps on reversibility, the fate of outstanding bids, and the reference format for the listing argument.

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?

There is one required string parameter, listing, with 0% schema description coverage, so the description must carry the meaning. It implies the parameter identifies the listing to close but never states whether it is an ID, slug, or title, leaving the agent to guess the format.

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?

Names a specific verb (take down / close) and resource (listing), and distinguishes two modes: seller takedown vs. closing an auction past its end. It does not name sibling tools such as listing_update or buy_now, so an agent must infer the boundary itself.

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 one real precondition ("an auction past its end") and a permission note ("anyone may"), which is more than most tools offer. It stops short of saying when to prefer listing_update (e.g. editing rather than removing) or what to do for a listing that has not yet ended.

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