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

With no annotations, the description must explain side effects and behavior, but it only states that coordinates come 'via Open-Meteo.' It does not disclose whether an external network call is made, what failures may occur, or what the tool actually returns beyond a vague phrase.

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 concise and front-loaded, but it is too terse to be useful. It earns some credit for being short, but the lack of essential operational detail undermines the value of that brevity.

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 no output schema and nine optional parameters, the description is far from complete. It does not explain how to call the tool, what response shape to expect, which parameters are relevant, or how errors are handled.

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 description does not connect any of the nine parameters to the stated purpose. The schema includes many seemingly unrelated optional fields with odd 'discarded' descriptions, and there is no indication whether city, query, or something else supplies the place name.

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 communicates that the tool returns latitude and longitude for a place via Open-Meteo, but it lacks a clear verb and does not specify which input identifies the place. It is more informative than a tautology but still vague about the actual operation.

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 guidance is given about when to use this tool instead of related siblings like weather-hint or timezone. The description does not mention use cases, prerequisites, or alternatives, leaving selection decisions unsupported.

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