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 only mentions 'via Open-Meteo,' implying an external network call, but says nothing about failure modes, rate limits, side effects, or the fact that many input fields are discarded after use.

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 sentence with no filler, which is efficient. But it is under-specified for a nine-parameter tool with no annotations or output schema, making the conciseness a liability rather than a strength.

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?

There are no annotations, no output schema, and nine optional parameters, yet the description only states the high-level purpose. It does not explain output format, which parameter is required for the lookup, error behavior, or how this differs from related hint tools, leaving an agent with insufficient information to invoke it correctly.

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 100% description coverage across all nine parameters, so the baseline is 3 even though the description adds no parameter mapping. However, the schema itself is confusing: 'city' is described as 'for a public weather hint' and 'discarded after the call,' so an agent still cannot confidently determine which parameter supplies the geographic place.

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 identifies the tool's result as latitude and longitude for a place and names Open-Meteo as the source, so it is not a tautology. However, it lacks a clear verb like 'get' or 'resolve' and does not indicate which input field supplies the place, nor does it differentiate geo-hint from sibling tools like weather-hint or normalize-url.

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?

There is no guidance on when to use this tool versus alternatives such as weather-hint, timezone, or web-fetch. No context, exclusions, or alternative tool suggestions are provided, so an agent must guess the appropriate use case.

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