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

Annotations already declare readOnlyHint, idempotentHint and destructiveHint=false, so the safety profile is covered. The description adds useful behavioral context (result ordering, in-game meter units, gtadb.org coordinate reference), but is silent on what happens when neither an origin coordinate pair nor near_location_id is supplied, and on what takes precedence if both are given.

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 compact sentences with the core operation and ordering front-loaded, and units/coordinate reference packed into the second. No filler or redundancy.

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 six-parameter tool with zero required parameters and no output schema, the definition should say what the default query is when no origin is provided and how radius interacts with a pin-based search. Those gaps remain even though schema coverage is complete.

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 including x/y units, radius, limit and category enum is already documented in the schema. The description only restates the coordinate convention and nearest-first ordering, adding little beyond what the schema provides, and does not resolve the x/y versus near_location_id precedence question.

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 ('Find pins close to another pin or to a map position') plus result ordering ('nearest first'), so an agent knows this is a proximity query rather than a name/text search. It does not name the sibling tools (search_locations, search_landmarks) that the non-proximity cases map to, so differentiation is inferred rather than stated.

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?

The two supported origins (another pin vs. a map position) are described, which implies when the tool is appropriate, but there is no explicit when-not guidance or named alternative for name-based discovery. The agent must infer from sibling names like search_locations that those cover non-proximity queries.

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