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

No annotations, so description must disclose all behavioral traits. It only states geolocation and trial status, but omits details like rate limits, authentication requirements, error handling, or that it is a read-only operation.

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 sentences, front-loaded with the core purpose. No extraneous words. Efficient for a simple tool, though slightly more detail could be added without sacrificing conciseness.

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 one-parameter lookup tool with no output schema, the description covers the essential purpose and return values. However, it lacks information on potential failures, usage limits, or prerequisites, leaving some gaps for completeness.

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 input schema already describes the 'ip' parameter with 100% coverage. The description adds that it supports IPv4/IPv6, which is a minor improvement. Baseline 3 is appropriate as the schema does most of the work.

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?

Description clearly states verb 'Geolocate' and resource 'IP address', and lists return fields (country, city, etc.). However, it does not explicitly distinguish from siblings, which are quite different (currency_convert, email_validate), so it loses a point.

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 on when to use this tool versus alternatives. The description mentions 'Keyless trial', hinting at limited usage, but no explicit when-to-use or when-not-to-use conditions.

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