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

Annotations already declare readOnly/openWorld/idempotent/non-destructive, so the safety profile is covered; the description adds genuinely new behavior: a per-call charge ($0.003 USDC, x402 on Solana), that billing applies per successful call, that digest matching is recomputed locally, and that an equivalent HTTPS endpoint exists. It stops short of stating rate limits, failure/refund behavior, or what happens for unsigned or non-existent domains.

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?

One dense sentence that front-loads the four result categories before the supporting detail, then a short pricing/endpoint tail. No filler, though the run-on enumerations make it slightly harder to scan than a short bulleted structure would.

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?

With no output schema, the description does its job by listing the returned fields and warnings, and annotations cover the safety profile; pricing is disclosed. Missing only edge-case behavior (unsigned zones, NXDOMAIN, rate limits) that an agent might want before calling a paid endpoint.

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 0% and the single 'domain' parameter has no format, IDN, trailing-dot, or apex-vs-subdomain guidance in either place. The description only indirectly signals a domain name and mentions 'the zone apex', which hints at apex resolution but does not compensate for the coverage gap. Minimum viable 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?

Names a specific resource and operation ('DNSSEC status of a domain over DNS-over-HTTPS') and goes on to enumerate the exact result classes (secure / insecure / bogus / island) plus the artifacts returned (DS records, DNSKEYs, key tags, digest match warnings). An agent can distinguish it from sibling network tools like dns_dump or dns_propagation without opening a schema.

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 use case — validating DNSSEC chain of trust, including a check that DS digests actually match published DNSKEYs and RFC 8624 warnings — but never states when to prefer it over sibling lookups (dns_dump, dns_propagation, domain_intel) or any prerequisites. Usage is inferable but not directed.

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