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

Annotations declare readOnlyHint=true and openWorldHint=false, so the safety profile is covered. The description adds useful behavioral content by stating what the answer includes ('the first rise at which the area is reached'), which matters since no output schema exists, but it is silent on defaults, return format, and error cases.

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?

It is a single compact sentence, but it is grammatically incomplete (a noun phrase missing a leading verb), which costs clarity. Nothing is padded, but the front-loading is undermined by the broken construction.

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 six parameters, full schema coverage, and no output schema, the description should at least clarify the computed result and route the agent among the many flooding siblings; it partially describes the result but omits sibling differentiation and says nothing about storm_surge, lang, or defaults.

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%, so the parameters are already fully documented (including rise_m-vs-year/scenario and the scenario enum). The description only echoes the 'sea-level rise or a year and scenario' trade-off, adding no syntax or default detail beyond the schema. 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?

The description identifies the resource (one planning area) and the two outputs (residents in flooded parts at a given rise/year-and-scenario, and the first rise that reaches the area), which is more specific than the bare tool name. However, it is a verbless fragment rather than a clear action statement, so the agent must infer that this is a query returning a computed result.

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 guidance on when to use this tool versus siblings such as flood_impact, most_affected_areas, when_does_it_flood, or list_areas. The 'one planning area' phrasing hints at scope, but no conditions, exclusions, or alternatives are named.

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