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 and closed-world nature are covered structurally. The description adds only the filtering condition ('have wellness room builders') and does not say whether the list is static/cached, how results are ordered, or what each entry contains.

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 sentence with no filler, and the qualifying constraint is front-loaded so the agent reads the important scope information first.

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 zero-param read-only lookup with rich annotations, the essentials are present. Because there is no output schema, the description should ideally spell out what each returned entry looks like and whether the three geographic levels are returned as a hierarchy or a flat list; that gap is the only meaningful omission.

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?

The tool takes zero parameters, which is the baseline-4 case; there is nothing for the description to disambiguate. It could have clarified that the geography set is implicitly scoped (e.g., to the account or catalog), but no parameter semantics are at stake.

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 concrete verb and a concrete resource set (countries, regions, cities) plus a qualifying condition ('that have wellness room builders'), so the agent knows it returns a filtered geography list rather than arbitrary data. It is distinguishable from siblings like list_categories and list_sources by resource type, though it never explicitly contrasts itself with them.

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?

Usage is only implied: an agent can infer this is the discovery/lookup call for available geographies before searching listings. There is no explicit 'use this when...' statement, no mention of prerequisites, and no reference to alternatives such as search_listings or get_listing.

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