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

Annotations already provide readOnlyHint, openWorldHint, idempotentHint, and destructiveHint=false. The description adds meaningful behavioral context beyond those annotations: it is 'Free,' an 'Unaltered copy of the issuer's own notice,' includes 'the issuer's name and times,' and explicitly states 'ArrowMem adds no assessment.' This is valuable provenance and trust information without contradicting any annotation.

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 compact and front-loads the resource, then layers caveats and provenance. Every sentence contributes useful information, though the phrasing is slightly dense in places.

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 zero parameters, no output schema, and rich annotations, the description is largely complete: it identifies the data source, notes the unaltered copy and lack of assessment, and warns about absence of alerts. It could optionally clarify the return format, but that is a minor gap.

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 tool takes zero parameters, so parameter semantics are not applicable. Per the baseline for zero params, a 4 is appropriate; the description does not need to compensate for missing schema details.

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 names a specific resource: NOAA Space Weather Prediction Center scales (G, S, R) and alert bulletins. It is clear this is a retrieval tool, and the name disambiguates it from terrestrial weather siblings, though the text itself does not explicitly differentiate from get_us_weather_alerts or get_canada_weather_alerts.

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 offers a caveat that it is 'Not an official alerting channel, and no alert does not mean calm,' which guides interpretation but not tool selection. It does not state when to use this tool versus alternatives, nor does it list exclusions; usage is only implied by the name and context.

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