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

No annotations are provided, so the description must carry the burden of disclosing behavioral traits. It implies a read-only operation but does not explicitly state that all parameters except city are ignored and discarded. The schema descriptions mention 'discarded' for several params, but the tool description does not aggregate this, leaving the agent to infer that unrelated inputs have no effect.

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, concise sentence that front-loads the core function. It is efficient and easy to parse, though it could benefit from a brief note about the irrelevant parameters without becoming verbose.

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 parameters, many unrelated to weather, and no output schema, the description is insufficient. It does not explain why the other parameters exist, that they are discarded, or what the return format is. An agent might reasonably assume the tool handles URLs, JSON, etc., leading to misuse. The description fails to clarify the tool's actual scope and behavior.

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 description coverage is 100%, so each parameter already has a description. The tool description adds no additional meaning beyond the schema, such as expected format or constraints for the city parameter. The baseline of 3 applies because the schema handles documentation, but the description does not enhance it.

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 a specific purpose: retrieving current temperature for a city via Open-Meteo. It is distinct from siblings like geo-hint, which likely deals with geolocation. However, it does not acknowledge the presence of 8 other parameters in the schema that are unrelated to weather, which slightly muddies the tool's scope.

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 offers no guidance on when to use this tool versus alternatives such as geo-hint or lib-docs-hint. It simply states the function without providing context for selection, prerequisites, or exclusions.

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