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

Annotations already declare readOnly/idempotent/non-destructive, so the description's value-add is elsewhere: it discloses cost ('Free') and, importantly, the content contract — an 'unaltered copy of the issuer's own notice' with no added assessment by ArrowMem. That provenance and no-endorsement caveat is real behavioral context an agent cannot get from annotations.

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?

Scope is front-loaded in the first clause, and the remaining sentences (source caveat, Canadian exclusion, cost, provenance) each add distinct information. It is dense but not padded; a mild run-on in the provenance sentence is the only cost.

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?

No output schema exists, and the description compensates by describing what comes back (issuer's own notice, issuer name and times, unaltered). The one gap is that `area` is not required, yet the description never says what happens when it is omitted (all US? error?). Otherwise complete for a single-parameter read tool.

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% and the pattern is documented with an example ('TX'), so the schema carries the parameter burden. The description only restates 'one US state or territory code' without adding format or validation detail. Baseline 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?

States a specific verb+resource+scope: 'Active National Weather Service alerts for one US state or territory code, as issued.' It also explicitly carves itself away from the sibling get_canada_weather_alerts, so an agent can distinguish it without opening either schema.

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?

Explicitly excludes Canadian locations and routes to the Canada weather alerts tool, and warns it is 'not an official alerting channel'. It lacks any positive when-to-use framing (e.g., vs. other alert sources like tsunami or space weather), but the exclusion and alternative naming are clear.

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