Regions with the best dive windows right now

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

With no annotations provided, the description carries the full burden of behavioral disclosure. It effectively conveys that the tool is forecast-oriented, time-limited to ~72 hours, and not a safety guarantee. It could expand on ranking logic or output shape, but the essential caveat is well covered.

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?

Two sentences, no redundant wording, and the main purpose is front-loaded. The safety caveat earns its place by clarifying the tool's limitations without bloating the description.

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 zero-parameter read-only ranking tool, this is nearly complete: purpose, time horizon, and operational caveat are all stated. The lack of an explicit output-structure description is a minor gap, but an agent can still call and interpret the result confidently.

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 has zero parameters, so there are no input semantics to document. The description appropriately focuses on what the tool returns rather than filling a param gap, which is exactly right for a no-argument tool.

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 a specific resource (world regions), the action (ranked), and scope (favorable dive-forecast windows over ~72 hours). It implies a broad regional ranking that differs from siblings like find_dive_windows, but it does not explicitly name or distinguish sibling tools, so it stops just short of a 5.

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?

It provides clear context: use this for forecast planning, not as safety clearance, and always verify on-site conditions. This gives a strong sense of when and when-not to rely on it, though it stops short of naming alternative sibling tools for specific use cases.

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