Subnet Calculator MCP

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

No annotations are provided, so the description carries the burden. 'Calculate' implies a pure, read-only computation, and the input forms are specified. However, it does not disclose what specific subnet information is returned, error handling, or edge cases, which leaves some behavioral ambiguity.

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, well-structured sentence that front-loads the action and includes all necessary input context. No redundant wording; every word contributes.

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 low-complexity calculator with no output schema, the description gives a reasonable overview but leaves the exact return value unspecified. An agent may not know whether it receives network address, broadcast, usable hosts, etc., which is a meaningful gap.

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 coverage is 100%, so the baseline is 3. The description adds a concise summary of the three input alternatives, but it does not provide details beyond the schema's own parameter descriptions. It adds little extra semantic value.

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 clear action ('Calculate') and a specific resource ('IPv4 subnet information') along with the three accepted input forms. It is immediately obvious what the tool does, and it stands alone even without sibling differentiation.

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 gives clear context for when to use the tool: whenever subnet information is needed from an address with CIDR, a prefix length, or a dotted mask. It doesn't explicitly discuss exclusions or alternatives, but no siblings exist, so the provided context is sufficient.

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