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

Annotations already declare readOnlyHint=true and openWorldHint=true, so the trailing "Read-only" merely restates structured data. The valuable addition is the enumerated return fields, but there is no mention of pagination behavior, default ordering, or what an empty result means for an event with no slots.

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 short sentences with zero waste: purpose and returned fields first, then the optional filter and safety note. Nothing is buried or redundant beyond the minor read-only restatement.

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 no output schema, the description usefully pre-announces the shape of each slot record. Pagination is left entirely to the schema, which covers it adequately, so the definition is nearly sufficient for an agent to call it correctly.

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 limit, offset, eventId, startAfter and startBefore are all documented in the schema itself. The description's only parameter content is the YYYY-MM-DD date-range filter, which duplicates the schema; 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 verb+resource ("List the dates and time slots of an event") and enumerates the returned fields (start, end, capacity, tickets sold, state), which clearly separates it from siblings like universe_get_event or universe_list_events. It does not name a sibling explicitly, so it stops short of a 5.

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 gives filter guidance ("Optionally filter by start date range") but never says when to choose this over universe_get_event or universe_list_ticket_types, nor any precondition beyond needing an eventId. Usage is implied by the resource name rather than stated.

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