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

Annotations already declare readOnlyHint=true, destructiveHint=false, idempotentHint=true and openWorldHint=false, so the safety profile is fully covered and the description's 'read-only' merely restates it. It does add some useful behavioral context about the data shape ('next resolved dates', item carries starts_on/ends_on, organiser source URL, citable page), but the presence of an output schema lowers the bar for return-value disclosure.

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 tight sentences, front-loaded with the resource and scope, followed by the filtering and item-shape details. There is no filler, hedging, or repetition.

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, six-parameter search tool with a full output schema and complete annotations, the description covers purpose, filters and what each item contains without needing to explain return formatting. The only shortfall is the absence of explicit routing guidance against similarly search-oriented siblings.

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%: the six parameters already document slugs, ISO date semantics, the date_from default of today, and the did_you_mean behavior for unknown cities. The description merely lists the filter categories, adding no syntax, format, or interaction detail beyond the schema, so the baseline 3 applies.

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 resource (wine festivals) with a scoping qualifier ('next resolved dates') and explicitly flags the operation as read-only. It is clearly distinct from siblings like cities, dishes, stays and experiences, though it does not name a sibling or contrast itself with one.

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 names the available filter dimensions (city, country, date window, text), which implies how the tool is meant to be used. However it gives no explicit when-to-use guidance, no prerequisite conditions, and no routing advice relative to sibling tools such as place or search_places.

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