renewDomain

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

No annotations are provided, so the description must carry the behavioral burden. It discloses a critical financial consequence: 'Spends account funds.' However, it does not mention other behaviors such as irreversibility, effect on expiration date, or failure conditions. The disclosure is useful but limited.

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 short sentences that immediately state the action and the most important consequence. The API reference link is supplementary and does not dilute the core message. No wasted words.

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 simple 4-parameter tool, the description covers the essential purpose and cost implication, but without annotations or an output schema, it leaves out details like what happens on success or whether renewal is immediate. The API link may help, but the description itself is minimal.

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 each parameter already has a description. The tool description adds no extra parameter-level meaning beyond the schema. Baseline 3 is appropriate because the schema carries the semantic weight.

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 uses a specific verb ('Renew') and resource ('a domain you already own'), clearly distinguishing it from tools like registerDomain. The phrase 'Spends account funds' adds a meaningful operational distinction. No ambiguity about what the tool does.

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 phrase 'a domain you already own' establishes the clear context for when to use this tool versus registering a new domain. It implies an exclusion of domains not yet owned, but does not explicitly name alternative tools like addAutoRenewal or registerDomain.

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