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

Annotations already cover read-only, idempotent, non-destructive, open-world, so the bar is lower. The description still adds real value beyond them: the call is free, the payload is sourced from /.well-known/x402, and it carries no report data — all facts unavailable 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?

Three short sentences, front-loaded with the free-cost signal and ending with the no-inputs constraint. Every sentence adds a distinct fact with no repetition.

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, yet the description enumerates the returned contents (reachability, API version, paid routes with prices and accepted assets) and the source endpoint. For a zero-parameter status tool, nothing an agent needs to decide to call it is missing.

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, and the description confirms "No inputs," matching the empty schema. Baseline applies; nothing further is needed.

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?

Names a specific verb and resource: returns reachability of the Agent Weather API and its XRPL payment facilitator, the API version, and the paid route/price/asset list. It also explicitly rules out report data, which separates it from siblings like get_model_report and get_current_conditions.

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?

"Free" and "Returns no report data" give clear context for when this tool is appropriate (status/price discovery, no cost) rather than a data fetch. It stops short of naming an alternative tool to use once prices are known, so no explicit routing.

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