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

With no annotations, the description carries the full burden, and it usefully discloses quota semantics that no structured field provides: all IPs are validated before quota is charged, and each IP in a valid batch counts as one lookup. It omits auth requirements, rate limits, and what happens to a batch containing a mix of valid and invalid addresses.

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?

Two tight sentences, front-loaded with the capability and followed by the quota rule. Every clause carries information; no filler.

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 lookup tool with no output schema or annotations, the description covers purpose, batch limit, validation, and cost model. It stops short of describing the returned geolocation fields or error behavior for invalid entries, which leaves a small 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?

There is only one parameter and schema description coverage is 100%, so the baseline is 4. The description's 'public IPv4 or IPv6' wording reinforces the schema's 'public IPv4 or IPv6' constraint but adds no format syntax or detail beyond it.

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 (look up), resource (geolocation), and scope (up to 100 public IPv4/IPv6 addresses in one call). The batching language implicitly separates it from the single-IP sibling lookup_ip, but neither sibling is named, so differentiation must be inferred.

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?

Usage is implied rather than stated: the 'up to 100 ... in one call' phrasing suggests this is the batch alternative to lookup_ip, and my_location is never mentioned. No explicit when-to-use/when-not guidance or routing condition is given.

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