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

With no annotations provided, the description must carry the behavioral burden. It discloses read-only status, free cost, heuristic method, and bundled CIDR lists, but does not discuss limitations such as potential false positives, update frequency, or handling of special IP types.

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 appropriately sized: two sentences, front-loaded with the primary purpose, and the second sentence provides useful safety/cost context without 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?

For a simple tool with one parameter and no output schema, the description explains what it does and its method, but it does not specify the return format or limitations. This is a gap because the output schema cannot clarify expected results.

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 fully documents the single 'ip' parameter (type and description). The tool description adds no additional parameter-level guidance, matching the baseline for high schema coverage.

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 clearly states the tool's function: heuristically detect whether an IP belongs to a datacenter/hosting range using bundled CIDR lists. This specific verb-plus-resource phrasing distinguishes it from sibling IP tools like ip_reputation_risk_score or ip_reputation_asn_lookup.

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 explicit guidance on when to use this tool vs alternatives. The description implies it is a quick, free, read-only heuristic check for datacenter IPs, but it does not name alternatives or provide exclusion criteria.

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