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

No annotations are provided, so the description carries the full burden; it does disclose the transport (DNS-over-HTTPS), the graded output, and that concrete fixes are returned, which reveals it is a read-only audit. It does not state auth requirements, rate limits, or whether selectors fall back automatically in a deterministic way.

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?

A single dense sentence with the resource and method front-loaded and no filler. The enumeration of record types makes it long but every clause maps to a capability the agent needs.

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 2-parameter read-only audit tool with no output schema, the description covers what is inspected and the shape of the result (grade plus fixes). Only minor gaps remain, such as expected inputs for domain format and any auth/quota expectations.

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 coverage is 50%: 'domain' has no description and 'dkim_selectors' is only marked 'comma-separated'. The description compensates partially by clarifying that DKIM selectors may be common (default) or explicitly given, which explains what omitting the parameter does.

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?

Names a specific resource and action: a DNS plus email security audit enumerating A/AAAA/MX/NS/CAA, SPF, DKIM, DMARC, plus an A-F grade and fixes. This is clearly distinguished from the sibling get_dns (likely raw record retrieval) by the email-security and grading scope.

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 the usage context (checking a domain's DNS and email-auth posture), but never states when to prefer this over get_dns or whois_lookup, nor any prerequisites or exclusions. Usage must be inferred from the listed checks.

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