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

Annotations already declare readOnlyHint=true, destructiveHint=false, and openWorldHint=true, so the safety and external-lookup profile is covered. The description adds that the result is the *nearest* address used to populate a start field, which is useful context. It omits what happens when no address is found, whether multiple candidates are returned, and any accuracy or rate considerations for an open-world lookup.

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?

A single sentence with no wasted preamble, front-loaded with the verb 'Returns'. However, the phrasing 'from the Use current location button in the panel, to fill the start' is UI-jargon-heavy and grammatically tangled, weakening readability.

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?

The tool is simple (two numeric parameters) and has an output schema, so return values need no explanation. Still, for an open-world reverse-geocoding call, the description should say what happens on no-match or ambiguity; those gaps are moderate rather than fatal.

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 0%, so the description carries the burden, and it only says 'coordinates' without specifying coordinate system, precision, or units. The names latitude/longitude plus min/max bounds are largely self-explanatory, which prevents a 1, but the description adds no meaning beyond the schema.

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: returns the nearest address for given coordinates, which is effectively reverse geocoding. It implicitly separates itself from search_places (text search) and select_addresses, though it never names a sibling. The UI-centric phrasing ('Use current location button in the panel') is odd for an API surface but the operation itself is unambiguous.

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 only implied through the UI trigger ('from the Use current location button... to fill the start'), which tells the agent the scenario but not the decision rule. There is no explicit statement of when to prefer this over search_places or select_addresses, and no exclusions or prerequisites.

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