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

Annotations already declare readOnly, idempotent, and non-destructive behavior, so the description only adds source attribution to Open-Meteo and the imperial/metric unit options. It does not disclose response structure, data freshness, or other operational behavior, but there is no contradiction with annotations.

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 concise sentences with no filler. The core action and coordinate input are front-loaded, and the source attribution is brief and useful context.

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 simple read-only weather lookup, the description is mostly adequate, but with no output schema it does not clarify what fields constitute 'current conditions' or what the response will contain. This leaves some expectations 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?

Schema descriptions are absent (0% coverage), so the description must compensate. It does mention latitude/longitude and imperial/metric units, which maps to all three parameters, but lacks details such as coordinate format, bounds, or unit default behavior beyond what the schema already provides.

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 identifies the tool as providing current weather conditions at a latitude/longitude, with units configurable. It differentiates from sibling weather tools by emphasizing 'current conditions' and coordinate-based input, though it uses a noun phrase rather than an explicit action verb.

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?

No explicit guidance is given about when to use this tool instead of related tools like weather_forecast, weather_hourly, or weather_zip. The coordinate/current-conditions scope is implied but not stated as a selection rule or exclusion.

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