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

With no annotations, the description carries the full behavioral burden. It mentions Open-Meteo, suggesting an external API call, and 'current' implies a read-only operation, but it does not disclose that the other eight optional parameters appear irrelevant, whether there are side effects, rate limits, or what the response contains beyond temperature.

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, scannable sentence with no wasted words. It is concise and front-loaded, though slightly too terse to carry the additional context needed for a tool with many optional parameters.

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 nine optional parameters, no annotations, and no output schema, so the description needs to explain which parameter matters and what behavior to expect. It does not mention that city is the operative parameter, what happens with the other fields, or what the tool actually returns, leaving the definition incomplete.

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 baseline is 3 even though the tool description adds no parameter-level detail. The description only reinforces 'city' but does not help the agent choose among the nine unrelated optional parameters or clarify that most are likely ignored.

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 core purpose clearly: returning the current temperature for a city via Open-Meteo. It is specific enough to identify the domain, but it lacks an explicit verb and does not differentiate this hint tool from sibling tools like geo-hint.

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?

There is no guidance on when to use this tool versus alternatives, no prerequisites, and no exclusions. The one-line purpose implies weather lookups, but an agent must infer usage from the tool name and description without any explicit routing or comparison to sibling tools.

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