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

No annotations are present, so the description carries the full burden of behavioral disclosure. It mentions nothing about side effects, that most parameters are discarded, network usage, caching, or response format. It merely states the function without disclosing operational behavior.

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, tight sentence with no filler. It front-loads the core purpose and every word adds value, adapting to good brevity for a simple weather 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?

With 9 optional parameters, no output schema, and no annotations, this description is insufficient. It does not explain how the myriad parameters relate to the weather function, whether only 'city' matters, or what the response looks like. An agent calling it correctly cannot infer the expected return or the irrelevance of most parameters.

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% and the description adds no parameter-specific meaning. Since each parameter is already fully described in the schema, the baseline is 3; the description does not need to repeat details but could have highlighted 'city' as the requireable input.

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 'Current temperature for a city via Open-Meteo' states a specific verb/resource (retrieve current temperature for a city) and names the data provider (Open-Meteo). It clearly distinguishes this tool from siblings like geo-hint or timezone by scope and action.

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 alternatives, no conditions, no exclusions, and no mention of which sibling to prefer. It only states the core function, leaving the agent to infer when to call it.

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