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

With no annotations present, the description carries the full burden of behavioral disclosure. It mentions the external service (Open-Meteo) but does not state whether the call is read-only, how results are returned, what units are used, or how errors and timeouts are handled.

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?

A single sentence with no filler; the key identifying details, resource and provider, are front-loaded. It is appropriately sized for a simple read tool.

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 seven-parameter schema and no output schema or annotations, the definition is not complete enough. It does not mention that only the city parameter is relevant, how the other parameters behave, or what the caller should expect in the response.

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?

All seven parameters already have descriptive schema text, so the schema covers most semantics. The description adds no parameter detail beyond implying that city is the key input; the baseline 3 is appropriate because it does not compensate for the unusually wide parameter list.

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 identifies the resource (current temperature for a city) and the provider (Open-Meteo), so an agent can infer the tool returns weather data. It lacks an explicit verb like 'gets' and does not contrast with related siblings such as geo-hint, but the core purpose is clear.

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 about when to use this tool instead of alternatives like web-fetch or geo-hint, and no exclusions are stated. The description only declares the basic function, leaving the agent to infer suitability.

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