get_weather_by_city_name

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

Annotations already declare readOnlyHint=true (safe read) and openWorldHint=true (supports flexible queries), so the description doesn't need to repeat these. It adds value by specifying 'common Japanese cities', which clarifies scope beyond what annotations provide, but lacks details on rate limits, error handling, or response format.

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, efficient sentence that front-loads the core purpose ('Get weather forecast') without unnecessary words. Every part of the sentence contributes to clarifying the tool's function, making it highly concise and well-structured.

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's simplicity (1 parameter, 100% schema coverage, annotations provided), the description is adequate but has gaps. It lacks output schema details (e.g., forecast format) and doesn't fully address sibling tool differentiation, which could leave the agent uncertain in complex scenarios.

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%, with the parameter 'cityName' fully documented in the schema (including enum values and description). The description adds marginal context by emphasizing 'common Japanese cities', but doesn't provide additional syntax or format details beyond what the schema already covers.

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 clearly states the action ('Get weather forecast') and target ('common Japanese cities by name'), which is specific and actionable. However, it doesn't explicitly differentiate from sibling tools like 'get_weather_forecast' or 'get_available_city_ids', leaving some ambiguity about when to choose this tool over 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 provides minimal guidance, mentioning 'common Japanese cities by name' which implies usage for those cities, but it doesn't specify when to use this tool versus siblings like 'get_weather_forecast' or 'get_available_city_ids'. No explicit alternatives, exclusions, or contextual rules are provided.

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