dns_reverse_bulk

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

No annotations are provided, so the description must carry the full burden. It only states the action ('reverse DNS lookup') without disclosing behavioral traits such as whether it is read-only, response format, rate limits, or error handling. This lack of detail is insufficient for a tool that may have side effects or edge cases.

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 short sentence (6 words) that is front-loaded and free of unnecessary detail. It efficiently communicates the core purpose without wasting tokens or confusing the reader.

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 tool with two parameters and no output schema, the description could be more complete. It lacks information about what the response contains (e.g., results per IP, errors) and any operational constraints. While the core purpose is clear, the absence of such context makes it minimally viable but not robust.

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 100%: the 'ips' parameter is described as a list of IPv4/IPv6 addresses, and 'resolver' as an optional DNS resolver IP. The description adds no additional meaning beyond what the schema already provides, so the baseline of 3 applies. No gap to compensate for.

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 uses a specific verb ('lookup') and names the resource ('reverse DNS') plus a clear scope ('multiple IP addresses'). This directly distinguishes it from sibling tools like dns_reverse (likely single IP) and dns_lookup (possibly forward lookup), making the purpose unambiguous.

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 usage context: use when you need reverse DNS for many IPs. However, it does not explicitly state when to use this over alternatives (e.g., dns_reverse for a single IP, dns_bulk for forward bulk lookups) or provide any exclusions. Sibling tools exist but are not mentioned, so guidance is only inferred.

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