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

With no annotations, the description must disclose behavior, but it only states the core function. It does not mention that this may involve a network call, what input actually identifies the place, whether any parameters are discarded, or what the output format will be. Several schema fields explicitly say 'discarded', but this is not surfaced in the description.

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?

One short sentence is concise, but it is under-specified for a tool with nine parameters and no annotations. It sacrifices necessary information for brevity, so it is not an appropriately sized definition.

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?

This is a 9-parameter tool with no output schema and no annotations, yet the description provides no input mapping, no output description, and no behavioral caveats. It is far from enough for an agent to call the tool 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?

Schema description coverage is 100%, so the baseline is 3 even though the description itself adds no parameter-level detail. The word 'place' loosely maps to the 'city' parameter, but with nine unrelated-looking optional parameters, the description does not help select or fill the right one.

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 phrase 'Latitude and longitude for a place via Open-Meteo' conveys a geocoding purpose and names a provider, which is more than tautological. However, it lacks a clear verb and does not explain how the tool relates to its nine input parameters, making the purpose only vaguely useful for an agent.

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 geo-hint versus siblings like weather-hint or timezone. No conditions, prerequisites, or alternatives are mentioned, leaving the agent to guess which tool fits a given request.

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