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

Although annotations already establish read-only, idempotent, and non-destructive behavior, the description adds essential result semantics for each status and explains that 'declared' is not proof. It also bounds the tool's meaning by warning that address control does not establish company trustworthiness or payment safety.

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?

The purpose is front-loaded, the result statuses are defined compactly, and the final caveat prevents over-trusting the result. Every sentence carries decision-relevant information without repeating structured fields.

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?

There is no output schema, so the description must explain return semantics and it does so thoroughly by defining each status and its payment implication. With annotations covering safety and schema coverage at 100%, the remaining gap is negligible.

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 domain, address, and chain, including auto-detection when chain is omitted. The description adds the supported ecosystem scope (XRP Ledger, Ethereum/EVM including BNB Chain and Base, Solana), but does not add syntax or constraints beyond the schema.

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 opens with an explicit action and object: check whether a crypto payment address belongs to a company domain, and it names the supported chain families. The scope is distinct from search_registry, verify_agent, and verify_signature_agent, but those siblings are not explicitly contrasted.

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 clearly states the use case: before paying a company in crypto, verify the payment address against the domain. It also gives an explicit when-not rule: if the result is not_declared, domain_not_registered, invalid_address, or different_from_proven, do not pay without confirming through another channel.

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