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

No annotations exist, so the description carries the full burden. It discloses the tool is read-only (no mutation), produces signed/timestamped output, mentions determinism, and notes DNS mutability. However, it lacks details on error handling, rate limits, or response size, which would improve transparency.

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 moderately long but every sentence adds meaningful detail (purpose, normalization, verification, pricing). It could be slightly tighter (e.g., remove 'Keyless, no LLM, no signup' if not essential), but remains well-structured and front-loaded.

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?

Given no output schema, the description provides a reasonable picture: a record set with a provenance receipt. However, it does not specify the structure or examples of the output, which an agent may need to parse the result correctly. The uniqueness among siblings compensates slightly.

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?

With 100% schema coverage, the description adds value by explaining that a URL's hostname is extracted and that domain is the primary parameter. This clarifies the alternative parameter and its behavior beyond the schema's basic descriptions.

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 produces a signed, timestamped DNS snapshot with specific record types (A, AAAA, MX, NS, TXT, CNAME, SOA), normalized and sorted. This distinguishes it from sibling tools like fetch or headers which focus on HTTP responses.

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 use for DNS resolution and provenance but does not explicitly state when to use this tool versus alternatives like fetch or notarize. No exclusions or alternative tool names are mentioned.

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