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

The readOnlyHint annotation already covers safety expectations. The description adds a useful scoping detail (the name must be a subdomain of nippy.site) but does not describe the return shape or what 'available' means in 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?

A single front-loaded sentence states the action, target, and domain constraint without redundant wording.

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 read-only availability check with one parameter technique, the description is largely complete. It could explicitly state the result semantics (e.g., boolean available/unavailable), but the phrase 'check whether' sufficiently implies the outcome.

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?

The input schema has no parameter description (0% coverage), but the description adds meaning by defining the parameter as a site name/subdomain of nippy.site. This is adequate for a single, self-explanatory parameter.

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 identifies the action (check availability) and the resource (a site name in the nippy.site subdomain space), distinguishing it from sibling file, upload, analytics, and publish tools.

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 purpose implies the usage context — check whether a potential site name is available before using it. It does not explicitly state when not to use it, but the intended use is clear from the description.

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