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

Annotations already declare readOnlyHint=true, so the safety profile is covered. The description adds useful context by explaining that a domain is resolved to its IP before lookup and that each call costs 30 points; it does not detail output format or error behavior.

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?

It is short and front-loaded in English, but the Korean text largely duplicates the English sentence, creating redundancy. The cost note is useful but placed at the end; a single-language version would be tighter.

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 one-parameter, read-only lookup tool with no output schema, the description provides enough to call it: input type, resolution behavior, cost, and result concept. It could be more explicit about the return structure, but the low complexity keeps this from being a serious gap.

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 coverage is 100% and the address property is already described as 'domain or IP' with an example. The description adds a small amount of process information (domain-to-IP resolution) but does not materially expand parameter meaning.

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 ('Look up') and resource ('geographic location of a domain or IP') and adds the domain-resolution behavior. It clearly states the tool's function but does not explicitly differentiate it from sibling lookup tools like nslookup or whois.

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?

No guidance about when to prefer this tool over nslookup, whois, or reverse_ip is provided. The closest signal is the phrase 'geographic location,' which implies a use case but never states exclusions or alternatives.

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