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

No annotations are provided, so the description must carry the full burden of behavioral disclosure. It only states the action and provider, but does not mention that all parameters except city are discarded, whether the operation is read-only, error behavior, or response format. This is a significant gap given the broad 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 short sentence, but it lacks essential information. It is not front-loaded with any scoping or usage constraints. It is under-specified rather than concisely informative, as the sentence does not earn its place by providing actionable guidance.

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 9 optional parameters and no annotations or output schema, the description is highly incomplete. It does not explain how the tool behaves with different parameters, what the output looks like, or any side effects. An agent cannot confidently call this tool based on the description alone.

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. The description mentions only city, and the schema itself documents each parameter. However, the description does not clarify that only city is used or that other parameters are ignored, which is critical given the schema's mix. It adds no value beyond the schema's descriptions.

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 a clear action (current temperature) for a resource (a city) via a specific provider (Open-Meteo), which is unambiguous and distinguishes it from siblings. However, the input schema includes nine optional parameters, most unrelated to weather, creating confusion about the tool's actual scope and undermining the clarity of the purpose.

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?

The description provides no guidance on when to use this tool versus alternatives, nor any conditions, exclusions, or prerequisites. An agent has no information about when weather-hint is appropriate compared to sibling tools like geo-hint or timezone.

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