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

With no annotations, the description must carry behavioral disclosure. It mentions the external service Open-Meteo, but does not disclose that only the 'city' parameter is used, that other parameters are ignored, or any rate limits or error conditions. The mismatch between the weather-only description and the multi-parameter schema is unexplained.

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?

One concise sentence that front-loads the core function. There is no waste, but it may be too sparse to convey necessary constraints or scope.

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?

Incomplete given the 9 optional parameters and no output schema. The description only addresses the 'city' parameter, leaving the other 8 unexplained in the context of the tool. It does not describe the return format, behavior with multiple parameters, or how the external call is made.

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 each parameter has a description. The tool description adds no meaning beyond the schema; for example, the schema already describes 'city' as 'City name for a public weather hint; discarded after the call'. The description does not clarify how the other 8 parameters relate to the stated purpose.

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?

States a clear verb and resource: returns current temperature for a city via Open-Meteo. This distinguishes it from siblings like geo-hint and timezone, but the 9-parameter schema implies a broader scope that the description does not address.

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 on when to use this tool versus alternatives. It does not mention any sibling tools, exclusions, or conditions, leaving the agent to infer usage from the name and description alone.

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