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 reveals that an external Open-Meteo call is involved; it does not mention side effects, rate limits, error behavior, or the notable fact that most parameters are discarded after a check, which is only disclosed in the schema.

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, efficient sentence with the core information front-loaded and no filler. However, it is somewhat too terse to resolve the confusion caused by the seven-parameter schema, so it is not a perfect score.

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 description is incomplete for an agent facing a schema with many unrelated parameters and no output schema. It does not explain why the other parameters exist, how the tool should be invoked, or what the response contains, leaving significant ambiguity.

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 input schema has 100% description coverage for all seven parameters, so the baseline is 3. The description adds no parameter syntax or format details and fails to clarify that city is the relevant parameter while the others are unrelated or discarded.

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 states the tool's purpose: returning the current temperature for a city via Open-Meteo. It is easy to distinguish from sibling tools like geo-hint, but it does not use an explicit verb and does not explicitly differentiate itself from alternatives.

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 other hint tools, nor any explanation of how to choose among the seven parameters. The schema suggests multiple unrelated input modes, but the description gives no selection criteria or exclusions.

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