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

The only behavioral detail is 'via Open-Meteo', which signals an external API call. It does not disclose return format, units, error behavior, or that several schema parameters appear unrelated and are discarded. With no annotations, the description carries the full burden but leaves much undisclosed.

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 focused sentence with no filler. The core action is front-loaded and every word earns its place.

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?

Given nine optional parameters, no annotations, and no output schema, this description is too thin. It does not explain the return value, units, failure behavior, or why the schema contains so many apparently unrelated parameters. An agent could guess to provide `city`, but would be uncertain about the rest.

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 the schema already documents each parameter. The description indirectly points to `city` but does not explain that the other eight parameters are irrelevant to the weather result, nor does it add meaningful parameter-level detail beyond the schema.

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 specific action and resource: 'Current temperature for a city via Open-Meteo.' It clearly conveys what the tool does and is distinct from siblings like geo-hint or timezone, though it does not explicitly distinguish itself from them.

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 alternatives, nor any mention of when not to use it. The description implies a weather lookup use case but provides no explicit context or exclusions.

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