reverse_dns

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

With no annotations provided, the description carries full burden but offers minimal behavioral context. It doesn't disclose rate limits, error conditions (e.g., invalid IP formats, non-existent PTR records), authentication needs, or what the output contains (e.g., hostname, multiple records). The description only states the basic operation without behavioral traits.

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 a single, efficient sentence with zero waste. It's front-loaded with the core action and resource, making it easy to parse. Every word earns its place without redundancy.

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 lookup tool with one parameter and no output schema, the description is minimally complete but lacks context about output format or error handling. It covers the basic purpose but doesn't help the agent understand what to expect from the operation, leaving gaps in usability.

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%, with the 'ip' parameter fully documented in the schema. The description adds no additional meaning beyond what's in the schema (e.g., no examples of IPv6, no note about private IPs). Baseline 3 is appropriate since the schema does the heavy lifting.

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 clearly states the specific action ('Perform a reverse DNS (PTR) lookup') and the resource ('on an IP address'), distinguishing it from sibling tools like 'dns_lookup' (which likely does forward lookups) and 'whois' (which provides domain registration info). The inclusion of '(PTR)' adds technical precision.

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 provides no guidance on when to use this tool versus alternatives like 'dns_lookup' or 'resolve_all'. It doesn't mention use cases (e.g., verifying IP ownership, troubleshooting) or exclusions (e.g., not for domain names). The agent must infer usage from the tool name alone.

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