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

The description discloses operational behavior beyond the annotations: it queries Cloudflare DNS-over-HTTPS with DO=1, an 8-second timeout, and defines all possible JSON response statuses (ok, not_applicable, timeout, error). It also explains how to interpret not_applicable and error. The readOnlyHint and openWorldHint annotations are consistent, and the description adds meaningful behavioral details.

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 dense but each sentence serves a purpose: purpose, operational details, and response contract. It is front-loaded with the primary function and avoids filler.

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?

The description fully defines the response envelope and status handling, and infers the contents of data from the purpose statement (DS/DNSKEY records and AD flag). However, it does not explicitly enumerate the fields inside the data object, leaving a minor gap given there is no output schema.

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 describes the single domain parameter and its validation rules, so the description need not add more. It doesn't repeat or expand on parameter semantics, but schema coverage is 100%, which meets the baseline.

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 title and description clearly state a specific action: checking whether a domain's zone is signed with DNSSEC and validating DS, DNSKEY, and the AD flag. It distinguishes itself from sibling tools like dossier_dns and dns_lookup by focusing on DNSSEC validation rather than general DNS 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?

The description provides clear context about what the tool does and when it is relevant (for DNSSEC validation checks), but it does not explicitly name alternatives or state when not to use it. The context is unambiguous, though no exclusions or alternative tool mentions are provided.

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