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

With no annotations, the description carries the full burden of explaining behavior. It states the tool returns 'ASN details or prefixes for an IP' but does not clarify whether it returns one or both, how the output is structured, what happens with an empty query, or any error behavior. The output schema exists but the description still leaves significant behavioral ambiguity.

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 a single compact, front-loaded line with no filler words. It is efficiently written, though it sacrifices clarity by being too terse to fully describe the tool's behavior.

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 tool with no annotations, an undocumented parameter, and many adjacent sibling tools, the description is too thin to make it reliably selectable and invocable. It leaves the input format ambiguous, provides no usage context, and does not distinguish 'asn' from the numerous related ASN/BGP tools.

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 only parameter, q, has no schema description, giving 0% schema coverage. The description adds the meaning that q is likely an IP, but it does not specify whether IPv4 and IPv6 are both accepted, whether ASN numbers are also valid inputs, or what the default empty string behavior is. The description does not sufficiently compensate for the uncovered schema.

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 names a specific resource (ASN details or prefixes) and the input object (an IP), so it is not a tautology. However, it lacks an explicit verb and does not differentiate itself from closely named siblings like asnlookup and asnprefixes.

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?

The description implies that the tool is for looking up ASN information for an IP, but it gives no guidance on when to choose this tool over siblings such as asnlookup, asnprefixes, or asrank. There are no exclusions, alternatives, or stated selection criteria.

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