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

Annotations already declare readOnlyHint, idempotentHint, openWorldHint, and destructiveHint=false. The description adds useful behavioral context beyond that: no auth is required, data is JMA official open data, and the response includes statuses and warning-code meanings. This aligns with and augments the annotations without contradicting them.

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 front-loaded with the core purpose, then efficiently covers return contents, parameter format, and data provenance. The warning-code mapping is long but earns its place because it directly helps interpret the returned codes. No filler or redundant restatement.

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?

For a simple read-only lookup with one optional parameter and an existing output schema, the description is complete: it explains the input, the data source, authentication needs, return elements, and how to obtain valid area codes. An agent has everything needed to invoke the tool correctly.

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?

The input schema already provides full documentation: pattern, default, common example codes, and a pointer to jma-bosai.reference.areas. The description repeats the 6-digit format and Tokyo example but adds no significant meaning beyond the schema, so the baseline 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 clearly states the verb ('Get'), the resource ('all currently active weather warnings and advisories issued by the JMA'), and the scope ('for a specified area'). It also names the key output elements (warning codes, statuses, headline summary), making it easy to distinguish from sibling tools like jma-bosai.weather.forecast, jma-bosai.weather.overview, and jma-bosai.seismic.recent.

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 establishes clear context: use this when you need current JMA warnings/advisories for a specific area. It does not explicitly name alternatives or exclusion conditions, but the scope is precise enough that an agent should not confuse it with forecasting or seismic tools.

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