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

Annotations already declare readOnlyHint, idempotentHint, non-destructive and closed-world, so safety is covered. The description adds the useful return-content hint (places come with listing counts), but says nothing about pagination, ordering, or auth beyond what annotations supply.

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 short sentence with no filler, but it is a verbless fragment that front-loads the noun phrase rather than the action, making it slightly awkward to parse as an instruction.

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 read-only, two-parameter tool with no output schema, the description's lack of any explanation of the category parameter and its enum leaves a real gap. It does convey what the result contains, which partly compensates for the absent output schema.

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 described in the schema (notably as returning 'towns', which conflicts slightly with the description's 'places'), while category has an enum but no explanation anywhere. The description never mentions category or its two allowed values, so it fails to compensate for the coverage gap.

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 the resource (places) and what it returns (places with listings and their numbers), but it is a noun phrase with no verb – it never actually says 'list'. It hints at scope (top-level vs. nested) but doesn't clearly distinguish itself from list_categories or search_listings.

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 phrase 'the top level, or the places inside a parent place' implies the two modes of use and maps to the optional parent parameter, but it gives no explicit when-to-use guidance and never names an alternative sibling tool for comparison.

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