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

There are no annotations, so the description carries the full burden of disclosing behavior. It reveals that Open-Meteo is involved, implying an external lookup, but it does not state whether the operation is read-only, what happens to non-city parameters, whether network access is required, or what errors may occur.

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 very short and the key output is front-loaded, which is good. However, it is a noun phrase rather than a complete sentence, and it omits essential selection and behavior details, making it under-specified rather than optimally 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?

The tool has nine optional parameters, no required parameters, and no output schema, yet the description gives almost no operational context. It does not explain which parameter to provide, what the return value looks like, or how Open-Meteo is queried, so an agent cannot reliably call this tool based on the definition.

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 coverage is 100%, so the baseline is 3 even though the description adds no parameter-level detail. The description's mention of 'a place' vaguely aligns with the 'city' parameter, but it does not explicitly map or clarify the role of the other eight parameters.

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 communicates that the tool returns latitude and longitude for a place, and names the external service (Open-Meteo). It lacks an explicit verb such as 'gets' or 'returns', and it does not distinguish itself from sibling tools, but the core purpose is unambiguous.

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 provided about when to use this tool versus alternatives, nor which input parameter identifies the 'place'. With nine optional parameters and many sibling tools, the agent is left to infer how to invoke it correctly.

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