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

Annotations already establish readOnlyHint and idempotentHint, so safety is covered; the description adds real value by disclosing the payload contents (flying-in/PPR and landing fees, organiser contact, booking/RSVP method) that would otherwise be unknown since there is no output schema. It does not mention auth needs, rate limits, or not-found behavior.

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 action and the identifier source, followed by a compact enumeration of returned fields. The enumeration is long but earns its place because no output schema exists to carry that information.

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 correctly takes on the job of describing return contents, and the 'Always share the event page URL' instruction covers a behavioral requirement annotations cannot express. It is nearly complete, only missing error/missing-event handling and confirmation that non-public events are excluded.

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 single param is documented in the schema, but the description goes beyond it by stating where the sqid/slug originates (search-events or featured-events), which is actionable provenance the schema does not provide. That is meaningful added semantics over a one-parameter baseline of 3.

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?

Specific verb+resource ('Get one public event') plus an enumeration of exactly what the record contains, so an agent can distinguish it from search-events (multi-result) and featured-events (curated list). The parenthetical naming the source of the sqid/slug further separates it from its siblings.

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?

It implicitly sequences usage by saying the sqid/slug comes 'from search-events or featured-events', which tells the agent to search first and fetch details second. It does not state any explicit exclusion (e.g. private events) or a when-not-to-use case, so it stops short of a 5.

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