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

Annotations already declare readOnlyHint, idempotentHint, openWorldHint, and destructiveHint=false, so the safety profile is covered. The description adds value the annotations do not: the shape of each record (author, text, date) and the cost model ('1 point per returned record'), which is real behavioral context for budgeting calls.

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 with zero filler, front-loading the action and resource followed by the return/cost note. Nothing is redundant or buried.

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?

There is no output schema, but the description compensates by naming the returned fields (author, text, date) and the billing behavior. Combined with a fully covered input schema, an agent has what it needs to call this correctly; only the missing when-to-use routing keeps it from a 5.

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 100% – item, domain enum, and max_items (1-500, default 25) are all documented in the schema itself. The description's 'by listing id or URL' merely restates what the item parameter description already says, so it adds no meaning beyond structured data; baseline 3 applies.

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+resource ('Comments on a Poshmark listing') and the identifying input ('by listing id or URL'), which is more precise than the title. It does not distinguish itself from near siblings like run_poshmark_items_likes or run_poshmark_items_related, so it stops short of a 5.

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 description never says when to reach for this tool versus run_poshmark_items_likes, run_poshmark_items_related, or run_poshmark_items, nor does it state prerequisites such as needing a valid listing id. The agent must infer usage from the name alone.

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