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

Annotations already declare idempotentHint=true and destructiveHint=false; the description adds real behavioral context by explaining the side effect ('sellers stop responding') and that the two outcomes are fulfillment vs. plain closure. It does not contradict the safe/non-destructive annotations, though it omits any note on reversibility or visibility of the closed ad.

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?

Two compact sentences, front-loading the primary action and its effect before the found-branch detail. No filler and nothing redundant.

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 two-parameter, idempotent state-change tool with no output schema, the description covers action, effect, and the branching semantics. It is nearly complete; only the post-close response/visibility behavior is unstated, which is minor here.

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 the baseline is 3, but the description adds meaning beyond the schema: it clarifies that found=true marks the ad fulfilled and that omitting it (the default/absent case) simply closes the ad. That resolves the optional parameter's default behavior better than the schema text does.

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 (close) and resource (the user's own wanted ad), and adds the operational outcome 'so sellers stop responding,' which separates it from siblings like post_want, my_wants, and delete_alert. An agent can identify the operation without opening the 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?

Conveys implied usage (closing one's own ad) and distinguishes the two terminal states via the found flag, but never names an alternative tool or an explicit when-not-to-use condition. Nothing tells the agent how this differs from delete_alert or why to prefer it.

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