DNS records

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

Annotations already declare readOnlyHint and openWorldHint, so the safety profile is covered. The description adds real behavioral context beyond that: the resolution source (Cloudflare DNS-over-HTTPS), that TTLs are returned, and that an email-auth SPF/DMARC check is included. It still omits failure behavior for nonexistent 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 heavily front-loaded sentence that packs the resource, supported types, backend, and return extras without a wasted clause.

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?

There is no output schema, and the description usefully previews the return content (records, TTLs, SPF/DMARC verdict). The main remaining gap is the default behavior of the optional 'types' parameter, minor for a read-only lookup tool.

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%, so the description has to carry parameter meaning. It names the supported record types, but those already appear as the enum in the schema, and it never clarifies what happens when 'types' is omitted (default all) or the constraints on 'domain'. It adds partial value but does not fully compensate.

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?

States a specific verb+resource ('DNS records for any domain') and enumerates the record types and resolution backend (Cloudflare DoH), so an agent knows exactly what it retrieves. It does not, however, differentiate itself from the similarly named sibling domain_lookup, leaving that distinction to inference.

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 never says when to pick this tool over siblings such as domain_lookup or ssl_certificate, nor any preconditions or exclusions. Usage is only implied by the phrase 'for any domain'.

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