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

Annotations already declare readOnlyHint, idempotentHint and openWorldHint, so the safety profile is covered. The description adds value beyond that by enumerating the returned fields and explicitly naming what is NOT returned (nftoken_id, image, mint time) with a pointer to the sibling that does return them. It does not mention pagination/truncation behavior for large portfolios.

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?

Front-loads purpose, then usage triggers, then return shape, then the exclusion/routing note — a logical order with no filler. It is on the longer side for a four-parameter list tool, but every clause (return fields, exclusion, sibling pointer) carries 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 correctly compensates by listing the returned fields and the excluded ones. Combined with the annotations it covers what an agent needs to call and interpret the tool; only edge behaviors (empty portfolio, limit truncation) are unaddressed.

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 schema already documents address, sort, limit and filter_tld in full. The description only reinforces that a valid XRPL address is required and adds no format or syntax detail for sort/filter_tld, 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 resource ('List all XRPL domains owned by a wallet address') and explicitly distinguishes itself from the sibling get_domain_profile, which handles single-domain detail. An agent can route between the two 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?

Gives concrete trigger phrases ('what domains do I own?', 'show me my domains') and covers the third-party case ('wants to see another wallet's holdings'). It also names the alternative (get_domain_profile) and the condition that selects it, so when-to-use and when-not-to-use are both explicit.

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