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

Annotations already declare readOnly, idempotent and non-open-world, so the safety profile is covered. The description adds genuinely useful behavior beyond that: exactly 10 results, distance-ordered selection, ordering by start time, and UTC timezone for all times. It does not discuss error behavior or missing-coordinate handling, but this is solid added context.

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?

Three short sentences, zero waste, with the core purpose and the result-set characteristics front-loaded. Every sentence carries information the agent needs.

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 explains the return shape (10 closest events, start-time order, UTC). Nothing critical is missing for a read-only search, though it omits what happens when fewer than 10 events match and whether the coordinate filter interacts with radius defaults.

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 latitude, longitude, radiusKm, date range, and type are all fully documented in the schema. The description only echoes 'coordinates' and 'date range' without adding syntax, units, or constraints 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 verb ('Find'), resource ('public board game events'), and scope ('near a set of coordinates'). This clearly separates it from find_games and search_collection, though it never explicitly contrasts itself with the very similar find_communities_nearby sibling.

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?

No statement of when to use this tool versus find_communities_nearby or the other siblings, no prerequisites, and no exclusions. Usage must be inferred purely from the purpose sentence.

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