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

Annotations already declare readOnlyHint, openWorldHint, and destructiveHint=false. The description adds valuable behavioral context: it discloses the external data sources used, notes that blacklist inclusion is optional/configuration-dependent, and explicitly says there is no composite appraisal score, only flags and per-section detail. It does not contradict the annotations.

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 front-loaded with the core purpose, then packs the supporting sections into a single efficient sentence. The final short sentence clarifies output behavior without repeating structured data. Every sentence earns its place.

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 read-only, open-world due-diligence tool with no output schema, the description does well: it lists the report sections and explicitly warns that there is no composite score, only flags and per-section detail. It could go further on response structure, timing, or rate/cost considerations, but the essential expectations are covered.

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 schema coverage is 100% for the single domain parameter, so the schema already documents its meaning and example. The description adds no additional parameter syntax or constraints beyond specifying that it operates on one domain, so the baseline of 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 specific verb and resource: a full due-diligence report for one domain. It enumerates the exact sections included (RDAP, backlinks/authority, toxic-linker audit, Wayback history, trademark search links, optional blacklist), making clear it is not a domain-availability search like its siblings.

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?

It gives a clear use case: 'Use before buying a domain.' This directly tells the agent when the tool is appropriate. It does not name alternatives or state when not to use it, so it falls short of a full 5.

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