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

With no annotations, the description carries the full burden of behavioral disclosure. It does reveal the data source (OSM) and the kind of output (nearest address), which is useful, but it omits the required coordinate format, any rate limits, and other behavioral constraints. The gaps are clear but not severe for a simple read-only 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?

The description is a single, efficient sentence with the core concept front-loaded and zero filler. Every word contributes to understanding what the tool does.

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 one-parameter tool, the description is close to sufficient, but the missing coordinate format is a significant gap that could cause incorrect calls. An output schema is present, so return values do not need explanation, but the critical input semantics are still underspecified.

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?

The schema has 0% description coverage for the single parameter q, so the description must compensate by explaining what q is and how to format it. It only mentions 'Coordinates' generically; it never explicitly states that q is the coordinate string or whether the format is 'lat,lon' or 'lon,lat'. This leaves the agent guessing on the one critical input.

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 clearly states the operation ('Reverse Geocode') and the resource mapping ('Coordinates → nearest address (OSM)'), immediately distinguishing it from forward geocoding and similar tools. The direction of transformation is explicit, so an agent can tell this apart from siblings like geocode or revgeo.

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 description implies the tool should be used when you have coordinates and need the nearest address, but it gives no explicit comparison or exclusions against alternatives like geocode or revgeo. There is no guidance on when not to use it or which sibling to choose instead.

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