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

With no annotations provided, the description carries the full burden of behavioral disclosure. It mentions an external service (Open-Meteo) but gives no information about side effects, rate limits, reversibility, or what happens to the passed parameters (some are marked 'discarded' in the schema, but that is not surfaced in the description). The description adds no behavioral context beyond the provider name.

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 with no wasted words. It is efficient, but it is under-specified rather than optimally concise—it omits essential usage information. The structure is clean, so it earns a 4 for brevity.

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 the tool's complexity (nine optional parameters, no output schema, and no annotations), this description is severely incomplete. It provides no information about expected input patterns, return format, or how the tool behaves with different parameters. An agent would have no way to call this tool correctly.

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?

Although schema coverage is 100%, the description fails to connect the tool's purpose to any specific parameter. It says 'for a place' but does not indicate whether 'city', 'query', or another field should be used to specify that place. The description adds no value in disambiguating the nine optional parameters.

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 the resource (latitude and longitude) and the provider (Open-Meteo), but the phrase 'for a place' is vague—it doesn't specify which input parameter identifies the place or how this differs from sibling tools like weather-hint, which likely also uses Open-Meteo. The purpose is recognizable but not sharply differentiated.

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 is given on when to use this tool versus alternatives such as weather-hint, timezone, or iana-zones. The description does not mention any preconditions, exclusions, or selection criteria, leaving the agent to guess.

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