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

With no annotations, the description carries the full burden, but it only reveals that Open-Meteo is the backend. It does not mention output format, failure behavior, rate limits, external network dependency, or whether the operation is read-only.

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 fluff, so it scores well on economy. However, for a tool with nine optional parameters and no annotations, it is more under-specified than appropriately concise.

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?

With nine optional parameters, no output schema, and no annotations, a one-sentence description is completely inadequate. The agent cannot determine how to specify the place, what coordinate format to expect, or what happens when the place is unknown.

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?

Although schema description coverage is 100%, the description does not map 'a place' to any of the nine optional parameters, and several schema descriptions are confusingly off-topic (e.g., city is 'discarded after the call' and query is 'discarded after the length check'). The description adds no disambiguating meaning, so an agent cannot tell which parameter actually supplies the 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 states that the tool provides latitude and longitude for a place via Open-Meteo, which is a clear enough core function and distinguishes it from siblings like weather-hint or timezone. It lacks an explicit verb like 'returns' or 'resolves,' and 'a place' is vague, but the intent is identifiable.

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 about when to use geo-hint versus any of the 29 sibling tools, nor any mention of alternatives or exclusions. The only implied context is that the user needs coordinates, which is not enough to make a confident tool choice.

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