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

With no annotations, the description takes on the full disclosure burden; it does reveal the data source, output fields, and available filters, which is solid. It does not discuss update cadence or default behavior, and the unsupported bounding-box claim is a behavioral inaccuracy that prevents a higher score.

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 the main verb and resource front-loaded, followed by filter and return-value detail. The structure is efficient, though the inaccurate 'bounding box' phrase is an avoidable addition.

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 no-output-schema tool, the description names the returned fields and the filters, and the schema supplies defaults and parameter meanings. However, the claimed bounding-box option is left completely unspecified in the schema, and units/ordering of results are not addressed, so the definition falls short of fully 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 the parameter baseline is 3 and the schema already documents each property. The description maps 'look-back window' to days and 'point+radius (km)' to lat/lon/radius_km, but the mention of a bounding box has no corresponding properties, creating a misleading parameter expectation.

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 action (list), the resource (recent earthquakes from the USGS feed), and the domain, which is sharply distinct from the weather/elevation/geocode siblings. It loses a point because it advertises 'optionally a bounding box' even though the input schema has no bounding-box parameters.

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 use case is explicit: call this when you need recent earthquake data worldwide, and the sibling tools are unrelated enough that no exclusion list is necessary. There are no prerequisites or cautionary conditions stated, but none are obviously required for this read-only feed.

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