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

The annotations already establish that this is a read-only, idempotent, non-destructive, closed-world operation, so the description need not repeat safety traits. It adds meaningful behavioral context by disclosing the returned payload: exact GeoJSON Polygon boundary, representative center, canonical links.map URL, and places_inside. It does not discuss error behavior or size/pagination concerns, but it substantially improves transparency beyond annotations.

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?

The description is a single front-loaded sentence that covers the action, identifier, and return contents without redundant wording. Every phrase contributes useful information for selecting and calling the tool.

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 one-parameter read-only lookup with no output schema, the description is largely complete because it explains the key return values. It could be slightly more complete by clarifying the shape or scale of places_inside or not-found behavior, but it gives enough context for correct invocation.

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%, and the single id parameter is fully documented in the schema as an area ID or slug with an example. The description reinforces that the identifier can refer to a neighborhood area or water town, but adds no syntax or format details beyond what the schema already provides. Baseline 3 is appropriate.

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 uses a specific verb and resource: retrieve a curated neighborhood area or water town by ID or slug. It also clarifies what is returned, including GeoJSON boundary, center, URL, and places_inside. It is clear but does not explicitly differentiate itself from siblings such as list_areas or get_place.

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 by-ID-or-slug phrasing implies this is the detail-retrieval tool for a known area, while list_areas presumably handles browsing. However, it does not explicitly state when to use this tool versus alternatives or mention prerequisites or exclusions.

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