domain_renew

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

With no annotations provided, the description carries the full burden of behavioral disclosure. The leading 'WRITE, COSTS MONEY' explicitly warns that this is a mutating operation with financial consequences, which is the most critical behavioral trait for an agent to know. It does not cover every edge behavior, but it does disclose the two most consequential aspects.

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 one tight, front-loaded sentence: 'WRITE, COSTS MONEY' appears first, followed by the essential operation. There is no filler, repetition, or unnecessary detail, making it easy for an agent to parse quickly.

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 that costs money and performs a write, the description is too thin. It does not explain the 'testing' parameter, which appears to be a safety mechanism, nor does it note prerequisites such as the domain being registered or managed at INWX. Without annotations or an output schema, this leaves important operational uncertainty.

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 only 33%, with only 'period' documented as 'e.g. 1Y'. The description adds only 'by N years,' which loosely maps to 'period' but provides no added meaning for 'domain' or the critical 'testing' boolean. Since 'testing' likely controls whether real charges are incurred, the lack of explanation is a significant gap.

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 states a specific verb ('renew'), a resource ('a domain'), a provider ('INWX'), and the dimension of the action ('by N years'). It is immediately distinguishable from sibling tools like domain_check, domain_price, or domain_transfer because only this tool performs renewals.

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 makes the core use case clear: use this when you need to renew a domain for a certain number of years. However, it does not explicitly state when not to use it, nor does it reference alternatives such as domain_info for checking expiry or domain_transfer for moving a domain.

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