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

Annotations already declare readOnly/idempotent/openWorld, so the safety profile is covered. The description adds genuine behavioral context beyond that: it discloses the no-result case ("Returns found:false if the address owns no XRPName") and that the primary name is conditional ("if set"). It doesn't cover result volume/pagination behavior, minor given limit is schema-documented.

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 front-loaded sentences with no filler: the mechanism first, then usage triggers, then the failure-mode return. Every sentence carries distinct information.

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 no output schema, the description carries the return-value burden and does so adequately, naming the primary name, the full owned-names list, and the found:false sentinel. It leaves the shape of the per-domain list (and what include_history surfaces in it) implicit, which is a small remaining 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?

Schema description coverage is 100%, so address, limit and include_history are already fully documented with defaults, caps and examples. The description restates the address input conceptually but adds no syntax or format detail beyond the schema, so the 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 and direction ("Reverse resolution: given an XRPL address, return its primary XRPName... and the full list of names owned"), which cleanly distinguishes it from the forward-looking sibling get_domain_profile. An agent can pick this tool without opening any 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?

Gives concrete user phrasings ("who owns [address]?", "look up this wallet", "what names does [address] have?") plus a chaining condition with get_domain_profile, which is unusually strong routing guidance. It stops short of a when-not-to-use statement or an explicit alternative to pick instead, so it is not a full 5.

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