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

Annotations already declare readOnlyHint=true, openWorldHint=true, and destructiveHint=false, covering the safety profile. The description adds the behavioral fact that no API key is required, which is useful beyond the annotations. There is no contradiction, and the additional info is relevant for invocation.

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 plus a compact example. The purpose is front-loaded, the example is immediately useful, and there is no redundant or filler content. The definition is tight and efficient.

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 single-parameter read-only tool with annotations covering safety and no output schema, the description provides enough context for a correct invocation: it explains the input type via schema, gives an example, and notes the no-key requirement. Minor gaps like output format or error behavior exist, but they are not critical for this simple tool.

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?

Schema description coverage is 100%, and the input description already enumerates accepted types (domain, IP, ASN, file hash). The description's example adds a concrete instance but does not introduce new semantic meaning beyond the schema. Baseline 3 is appropriate.

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 states a clear verb ('Resolve') and resource ('an asset and its catalog of attributes'), which is specific and informative. It provides an example call that reinforces the purpose. However, it does not explicitly contrast with sibling tools like whisper_identify or whisper_origins, so it lacks differentiation from alternatives.

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 notes 'Answers without an API key', which is a practical usage condition, and the example implies a direct lookup workflow. But it does not specify when to prefer this tool over siblings or when not to use it, leaving usage guidance implicit.

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