monitor_dns_lookup

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

No annotations are provided, so the description carries the transparency burden. It usefully discloses that the tool returns A, AAAA, MX, NS, TXT, CNAME, and SOA records, which matters because there is no output schema. However, it does not state that the lookup is read-only, what resolver or source is used, or how failures/timeouts behave, leaving some behavioral details implicit.

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 one concise sentence that front-loads the action and then lists the relevant output records. There is no filler or redundant restatement of the tool name.

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 simple two-parameter lookup tool, the description is adequate, but with no annotations and no output schema it could do more. It lacks explicit guidance on how this differs from monitor_dns_propagation or DNS record management tools, and it does not explain how the 'recordTypes' default interacts with the listed return types.

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 schema documents only the 'domain' parameter; 'recordTypes' has an enum and default but no description. The description partially compensates by listing the record type values, but it does not clarify that the schema default omits CNAME and SOA, so the claim 'Returns A, AAAA, MX, NS, TXT, CNAME, and SOA records' may overstate the default behavior. This is partial compensation, not full coverage.

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 states a specific action ('Perform DNS lookup') on a specific resource ('a domain') and enumerates the record types returned. It is clearly a DNS lookup tool, though it does not explicitly distinguish itself from siblings like monitor_dns_propagation or cf_list_dns_records.

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?

There is no guidance on when to choose this tool over alternatives such as monitor_dns_propagation, util_whois_lookup, or cf_list_dns_records. The only hint is the tool name and the action verb, so an agent gets no explicit context for selecting it among siblings.

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