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

Annotations already declare readOnly, idempotent, non-destructive, and closed-world, so the safety profile is covered. The description adds genuinely non-obvious behavioral context: the returned IP is the caller/connector's address, not necessarily the end user's device, which prevents misinterpreting the output.

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?

Three short sentences, front-loaded with the primary behavior followed by the caveat and the alternative. No filler or redundancy.

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?

An output schema exists, so return-value details need not be restated, and the key interpretive caveat is present. The only gap is the unidentifiable "website tool" reference, which leaves the agent without a concrete next step.

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 tool takes no parameters, so the baseline is 4; there is nothing for the description to clarify and it does not waste space on nonexistent inputs. Schema coverage is 100% anyway.

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?

States a specific verb and resource ("Returns the IP address of the caller or connector") and immediately qualifies the scope so the agent understands exactly what address it is getting. It is clearly distinguishable from diagnostic siblings like check_dns_leaks or measure_latency.

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?

Gives an explicit caution about when the result is NOT the user's public IP (AI client calling from its own server), which is useful usage context. However, the recommended alternative is "the website tool," which does not correspond to any sibling tool in the list, so the routing guidance is not actionable within this toolset.

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