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

Annotations already establish readOnlyHint, idempotentHint and openWorldHint=false, so the safety profile is covered. The description adds genuinely useful behavior beyond that: results are capped at the 10 closest, each entry carries its next public events, and times are returned in UTC. It does not discuss rate limits, caching, or result ordering beyond proximity.

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 tight sentences with no filler: the scope and source are front-loaded, followed by the return shape and timezone. Every clause carries information an 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 discloses the result shape (10 closest, next public events, UTC times). Combined with the fully documented input schema this is nearly complete; only the ordering/selection logic and any failure behavior for out-of-range coordinates are unstated.

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 (default 25, max 100) and the type enum are fully documented in the schema. The description adds no parameter-level syntax or format detail beyond restating the coordinate framing, 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?

The description names a specific verb ('Find') and resource ('board game cafés, clubs, stores and groups listed on Kallax.io') scoped by coordinates, which is clearly distinct from find_games and search_collection. However it does not differentiate itself from the sibling find_events_nearby, and in fact mentions returning 'next public events', which blurs the boundary between the two.

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 coordinate-based search and the return of nearby communities, but there is no explicit when-to-use statement, no exclusion criteria, and no routing to alternatives such as find_events_nearby or find_games. An agent must infer the selection context.

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