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

With no annotations, the description carries the full burden of behavioral disclosure. It does add one useful privacy behavior ('No identifiers are retained'), but it does not explain what the tool does with the inputs, what kind of result is returned, or whether there are side effects or errors.

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 short and front-loaded, but it is under-specified rather than efficiently complete. Both sentences are grammatically concise, yet they omit essential information about what the classification result looks like, so the brevity is not fully earned.

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 tool with 9 optional parameters, no output schema, no annotations, and many closely related siblings, this description is incomplete. An agent cannot tell what inputs to provide, what output to expect, or how the result should be interpreted.

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%, so the schema already documents each of the 9 parameters. The description itself adds no parameter-level meaning, but it does not need to compensate because each parameter already has a clear individual description.

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 verb and resource ('Show how this request is classified'), so it is not a tautology, but it is vague: it does not explain what classification labels or dimensions are produced, nor how this relates to the tool name 'compatibility'. It also does not distinguish this from the many sibling shape/ok/status 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?

There is no guidance about when to use this tool instead of the many similar siblings, such as domain-shape, file-path-ok, or validate-json. No context, prerequisites, or exclusions are given, so the agent must guess when this classification behavior is appropriate.

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