Compare Weather

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

Annotations (readOnlyHint=true, destructiveHint=false, idempotentHint=true) clearly convey that this is a safe, read-only operation with no side effects. The description adds 'Compare weather across multiple locations' but does not elaborate on behavioral traits beyond annotations. No contradiction, but minimal additional value.

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 sentence with no unnecessary words. It is front-loaded and immediately conveys the tool's purpose. Every word is justified.

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 that an output schema exists, the description does not need to explain return values. However, it could be more explicit about which weather conditions are compared (e.g., temperature, humidity). Nonetheless, the combination of name, title, and description is sufficient for an agent to understand basic usage.

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 coverage is 100% with detailed descriptions for both parameters ('City name or coordinates', 'Temperature units system'). The description does not add any meaning beyond what the schema already provides, so baseline score of 3 applies.

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 'Compare weather across multiple locations' clearly states the verb (compare), resource (weather), and scope (multiple locations). It effectively distinguishes this tool from siblings like weather.conditions.current (single location) and weather.conditions.forecast (forecast for one location).

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 versus alternatives. It does not mention that for single-location weather data one should use weather.conditions.current or weather.conditions.forecast, nor does it specify scenarios where comparison is appropriate.

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