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

No annotations are provided, so the description must disclose behavioral traits. It only states the purpose and omits any mention of side effects, external calls, error handling, or the read-only nature of the operation. The schema hints that many parameters are discarded, but the description does not clarify this. This is a significant gap for a tool that presumably makes an external API call.

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. It is front-loaded with the core purpose and is appropriately concise for a tool that performs a simple action. Every word contributes to understanding.

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 has 9 parameters but only one is relevant, and there is no output schema, the description is incomplete. It does not guide the agent on which parameters to supply, which are ignored, or what the response looks like. The lack of guidance increases the risk of misuse, especially with many sibling hint tools available. More context is needed for correct invocation.

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 documents all parameters. The description adds minimal value beyond the schema, only implicitly indicating that 'city' is the relevant parameter. Since the schema already explains each parameter's role, the description does not need to repeat it, but it also does not enrich the semantics. A baseline of 3 is appropriate.

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 clear purpose: get current temperature for a city via Open-Meteo. It is specific about the resource (city) and the action (getting temperature). It does not explicitly differentiate from sibling tools like geo-hint, but the weather focus is distinct enough that an agent can infer it. A score of 4 reflects that it is clear but does not explicitly name alternatives.

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 gives no guidance on when to use this tool versus other hint tools. It does not mention that only the 'city' parameter is relevant, nor does it indicate that other parameters are discarded. There are no exclusions or conditions for when to prefer this tool over siblings like geo-hint or lib-docs-hint.

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