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

Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false, and openWorldHint=false, so the safety profile is fully covered. The description adds nothing beyond them — no mention of return shape, counts semantics, or empty-result behavior.

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?

It is a single short clause with no waste, which is good, but it is a sentence fragment whose key information ('their numbers') is placed before the actual scope, making it read awkwardly rather than being cleanly front-loaded.

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?

With no output schema, the description should explain what is returned, yet 'their numbers' is left undefined. It also omits the 'category' filter entirely and gives no basis for choosing this tool over the four siblings, leaving real gaps for a two-parameter listing tool.

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 only 50%: 'parent' is documented in the schema and the description reinforces its meaning ('places inside a parent place' vs 'the top level'). However, the 'category' enum is never mentioned in the description, so half the parameters gain no additional meaning.

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 fragment 'The places with listings and their numbers' gestures at listing places with counts, but never states a verb ('list') or clearly names the resource; 'their numbers' is ambiguous. It does not distinguish this from siblings like search_listings or list_categories, so an agent must infer the purpose.

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?

There is no explicit when-to-use or when-not-to-use guidance, and no sibling is named as an alternative. The only contextual hint is the schema note that 'parent' comes 'from an earlier answer', which implies a follow-up step but is not framed as usage guidance in the description.

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