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

Annotations already declare readOnlyHint and idempotentHint, so the description's 'read-only' is consistent; it adds useful behavior beyond annotations: itineraries are editorial, day-by-day, each venue is resolved to structured fields, and an empty list is returned when a city has none. No contradiction.

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 dense sentence front-loads the core purpose and then packs in the resolved venue fields and empty-list behavior. Every clause earns its place.

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 an output schema present, the description does not need to explain return values; it covers the city-scoped behavior, what a venue entry contains, and the empty-case semantics. No essential behavior 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 description coverage is 100%, so both city and country are already documented; the description adds no parameter-level detail beyond saying the tool is city-scoped. Baseline 3 applies because the schema handles the parameter documentation burden.

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 identifies a specific resource – editorial day-by-day wine itineraries for a city – and specifies that venues are resolved to id, address, hours and page URL. It is distinguishable from siblings like plan_day or search_places, though it lacks an explicit verb like 'returns'.

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 description implies the tool is used when a user wants curated wine itineraries for a city, and notes when the list is empty. It does not explicitly name alternatives or state when not to use this tool, leaving route selection partly to inference.

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