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

No annotations are provided, so the description bears the full burden of behavioral disclosure. It mentions the service is free and uses Open-Meteo, but does not disclose error behavior, rate limits, return format, or what 'range' means (e.g., forecast high/low). This is insufficient for a tool with zero annotation coverage.

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 immediately conveys the core functionality. There is zero word waste, and the structure is front-loaded with the key information (current weather and range).

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 simplicity (only two parameters), the description gives a reasonable sense of what the tool does. However, with no output schema and limited parameter details, it leaves ambiguity about the exact output structure and what '3-day range' includes. It is adequate for a simple tool but has clear gaps.

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 0%, so the description must compensate. It explicitly names 'lat/lon' which adds basic semantics, but it does not specify units, valid ranges, or coordinate format beyond the schema's number type. The description provides minimal additional meaning.

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 that the tool provides current weather and a 3-day range for a lat/lon coordinate, using Open-Meteo. This is a specific resource and action, and it clearly distinguishes itself from sibling tools like fx_rates and track_parcel.

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 provides no guidance on when to use this tool over alternatives, nor does it mention any exclusions or prerequisites. While the tool's purpose is obvious, there is no explicit usage context.

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