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

With no annotations, the description must disclose behavioral traits itself. It mentions the data source (Open-Meteo) but does not state whether the call is read-only, requires network access, has rate limits, or how input is handled beyond vague 'discarded' notes in parameter descriptions. No side effects or prerequisites are disclosed.

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, but it is under-specified. It lacks any structural information such as which parameter to use or what the output format is. The brevity is efficient but does not earn a higher score because it omits critical context.

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?

The tool has 9 parameters, none required, and no output schema. The description is too sparse to be complete; it does not explain the expected input format, return structure, error behavior, or how the tool relates to its many parameters. An agent would struggle to call it correctly without inspecting parameter descriptions and guessing intent.

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% with each parameter already described, so the baseline is 3. The tool description adds no extra meaning to parameters; it does not clarify which parameter (e.g., city) is the primary input for geocoding, despite the schema listing many unrelated parameters like ref and json.

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 tool returns latitude and longitude for a place via Open-Meteo, which is a clear verb+resource. It does not differentiate from siblings like weather-hint or timezone, so it loses one point for lack of differentiation.

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 provided on when to use this tool versus alternatives. There is no mention of conditions, exclusions, or preferred scenarios, leaving the agent to infer usage from the name and schema.

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