ip_in_subnet

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

The description implies a boolean check but does not explicitly state the return type or behavior on invalid input (e.g., malformed IP or CIDR). With no annotations, the description should disclose side effects or error handling, and it fails to do so. The statement is too minimal to inform an agent of the tool's full behavior.

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 sentence, which is concise, but it omits essential details. It is not overly verbose, but the brevity comes at the cost of completeness. It earns a middle score for being short but not sufficiently informative.

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?

Given the tool's simplicity (2 parameters, no output schema, no annotations), the description is incomplete. It lacks information on return value format, error handling, and parameter constraints. An agent would need additional knowledge to invoke this tool correctly.

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%, meaning the parameter names are not described in the schema. The description does not explain the expected format of 'ip' (e.g., dotted decimal) or 'cidr' (e.g., '192.168.1.0/24'). This is a critical gap for correct usage.

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 tool checks if an IPv4 address belongs to a subnet. The verb 'Check' and the specific resource 'IPv4 address' and 'subnet' make the purpose explicit. However, it does not differentiate from sibling tools like check_coverage or subnets_overlap, which might have similar purposes.

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?

No guidance is provided on when to use this tool versus alternatives. There is no mention of prerequisites, limitations, or context for use. The description simply states what it does without any when-to-use or when-not-to-use information.

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