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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false, and openWorldHint=false, so safety is covered. The description adds useful behavioral context beyond annotations: ticket prices are listed by seller with no links because purchase happens on the event page, and it hints at related output (similar events, calendar links).

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, front-loaded with the core purpose and then the usage condition. The first sentence is dense with an enumerated list of return fields, which is slightly overstuffed given an output schema exists, but nothing is wasted or confusing.

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 one-parameter read tool with rich annotations and an output schema, the description is complete: it covers what the tool returns, the accepted identifier forms, the when-to-use condition, and the notable ticket-link caveat. An agent has everything needed to invoke 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 coverage is 100%, and the schema parameter description already specifies the 8-character id format and full URL acceptance. The description repeats that ids come from previous results or a spontanno.space URL but adds no syntax or format detail beyond the schema, so the baseline of 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 and resource ('Full details of one event by its `id`') and enumerates the returned content (dates, venues, address, age limit, prices, calendar links, similar events). This clearly distinguishes it from sibling search/list tools without needing to name 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?

Explicitly says when to use it: 'when the user asks about a specific event, its schedule, price or where to buy tickets.' It does not name an alternative for discovery (e.g., search_events), but the 'specific event' condition is clear enough to route correctly.

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