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

readOnlyHint=true already tells the agent this is a safe read with no side effects, so the description's job is lighter. It does add value by enumerating the returned data categories. However, with zero parameters the description never explains how the location is determined — presumably implicit from app/park context — which is a real behavioral unknown for a weather call.

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?

One sentence, front-loaded with the primary return values and ending with the highest-stakes item (severe weather/lightning advisories). Zero wasted words.

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 no parameters and no output schema, the description needs only to state what comes back and it largely does. The remaining gap is the mismatch between the 'storm radar' name and the absence of any radar/imagery mention, plus the unstated implicit location.

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?

Zero parameters, so per the baseline this scores 4; there is nothing for the description to disambiguate. The only residual point is that the description does not confirm the implicit location assumption, but the empty schema already makes non-parameterization clear.

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 uses a specific verb and enumerates the exact data returned: current temperature, feels-like, next-hour rain probability, and severe weather/lightning advisories. It is unambiguous against the theme-park siblings, none of which are weather tools. Minor gap: the tool name promises 'storm radar' but the description never mentions radar imagery, so the name slightly over-promises.

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 when-to-use guidance, no when-not-to-use guidance, and no mention of any alternative (e.g., create_watch_alert or list_active_alerts for alert subscriptions). The temporal scope ('next hour') is stated but never framed as a reason to pick this tool over something else.

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