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

Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false and openWorldHint=false, so the safety profile is covered. The description adds real behavioral context beyond that: only public events, a hard cap of the 10 closest results, ordering by start time, and UTC timezone semantics.

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, zero filler, and the most decision-relevant facts (proximity scope, result cap, ordering, timezone) are front-loaded. 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 no output schema, the description usefully discloses the return shape (10 closest events, ordered by start time) and timezone. It is largely complete for a read-only search tool, with only minor gaps such as pagination or what fields each event carries.

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 every parameter (type, dates, radius, coordinates) is already documented in the schema, including defaults and the 100km radius cap. The description's only added parameter-level meaning is the UTC note, which is minor; 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 (Find) and resource (public board game events) with the scoping qualifier 'near a set of coordinates'. The entity is clearly distinct from siblings like find_communities_nearby and find_games, though no sibling is named explicitly to route the agent.

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?

Usage is implied by the location-based framing ('near a set of coordinates') and the date-range mention, so an agent can infer this is the proximity search. However, there is no explicit when-to-use guidance, no exclusions, and no mention of when a sibling such as find_communities_nearby would be preferable.

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