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

Annotations already declare readOnly, idempotent, openWorld and non-destructive, so safety is covered. The description adds genuinely new behavioral context: only cities with active listings are returned, results are sorted busiest first, and the response includes counts and a site link. It doesn't discuss pagination or result caps, which keeps it from a 5.

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 sentences, no filler, with the core scope and ordering front-loaded and the cross-tool usage note second. Every clause carries information an agent needs.

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 single-parameter read tool with rich annotations and no output schema, the description covers what is returned (cities with counts and links), the ordering, the filtering (active listings only), and how to reuse the returned values. Nothing essential to correct invocation is missing.

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 100%, so the schema documents the pattern and accepted country/region codes, which sets a baseline of 3. The description adds real meaning beyond that by explaining the downstream use of the returned city slug and the region-as-country convention for US states, which is the non-obvious part of the parameter.

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 and resource (list cities of a country), scopes it to cities with active listings, and specifies ordering (busiest first) plus the payload (escort/venue counts and escortfox.com link). This clearly distinguishes it from list_countries and list_districts.

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?

Gives actionable downstream guidance: use the returned city slug as `city` in search_listings, and use the city's region as `country` where the site splits by state (e.g. "US-CA"). It does not explicitly state when to choose this over list_districts or list_countries, so it stops short of full when/when-not coverage.

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