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

No annotations are provided, so the description is the full authority. It usefully states that WHOIS/ownership data is not included, which implies a local, safe operation. However, it does not describe what is returned, how invalid input is handled, or whether any network/disk access happens beyond the 'no WHOIS' implication.

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 compact and efficient, a single sentence that leads with the action and adds a meaningful negative boundary. There is no fluff or repetition.

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?

The description creates a significant gap with the input schema: it mentions only 'hostname', while the schema contains nine parameters for different kinds of checks (file paths, refs, JSON, query length). No output schema and no explanation of the return value leaves the tool partially specified for an agent.

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% and all parameters have individual descriptions, so the baseline is 3. The description adds no extra meaning about which parameter should be used or how the nine inputs relate to the 'split hostname' job, providing no extra guidance to the caller.

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 the verb 'split' a concrete resource ('hostname') and adds a valuable negative clarifier ('without WHOIS or ownership data'). It is clear enough to distinguish this from WHOIS-style lookups, but it doesn't explicitly contrast with sibling shape tools like github-repo-shape or jira-key-shape.

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 the use case—when an agent needs hostname labels without ownership data—but gives no alternatives, exclusions, or prerequisites. It clearly says what action it does but not why this tool over the other siblings.

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