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

With no annotations provided, the description carries the transparency burden. It states the tool returns unsigned calldata, destination address, and value for wallet signature, making clear it does not broadcast the transaction. It also discloses permanence and the 0.001 ETH cost, which are useful behavioral facts beyond the schema.

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 description is two tight sentences that front-load the purpose and then give the essential output fields. There is no filler, repetition, or unnecessary schema content.

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 tool with no output schema and no annotations, the description covers the core contract: what it returns, that it is unsigned, and that the registration is permanent. It could additionally mention that the payload must be signed and broadcast separately, but the essential call context is present.

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 input schema has 100% parameter description coverage, so the baseline is 3. The description adds context about the fixed fee and return payload but does not add per-parameter semantics for domainName, recipientAddress, or targetChainId. No extra compensation is needed given the schema covers all parameters.

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 names a specific action ('prepare an unsigned on-chain transaction payload') and a concrete resource ('.i sovereign domain'), and it clarifies the output type. It is distinct from siblings like check_domain_availability or transfer_domain, though it does not explicitly name any alternative.

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?

The description gives no explicit guidance on when to use register_domain versus related tools such as estimate_registration, check_domain_availability, or marketplace_buy_domain. It also does not mention prerequisites like checking availability first; usage is only implied by the tool's obvious purpose.

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