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

With no annotations, the description must carry behavioral disclosure on its own. It does add one useful privacy-related behavior ("No identifiers are retained"), which matters for a tool accepting refs, URLs, and paths. However, it omits other important behavioral details, such as whether any network access occurs, how the classification is computed, or what the return value represents.

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 this is under-specification rather than effective conciseness. Two sentences carry only a vague purpose and a privacy note, leaving out nearly all information needed to invoke the tool correctly.

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 tool is complex due to its seven unrelated-looking parameters and many shape/check/type siblings, yet there is no output schema and no annotation coverage. The description does not explain what classification is produced, which parameters are relevant when, or what output the agent should expect, so an agent cannot reliably select or invoke this tool.

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 already provides descriptive explanations for every parameter, including discard behavior, so schema coverage is effectively 100%. The tool description adds no parameter-level meaning beyond the schema, which is acceptable because the schema does the heavy lifting.

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 an action ("Show how this request is classified") but the classification scheme is never specified, so the purpose remains vague. It does not distinguish this tool from related siblings such as domain-shape, normalize-url, validate-json, or citation, and the word "compatibility" is never even used in the description.

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 given about when to use this tool versus any alternative. There are no conditions, exclusions, or references to sibling tools, and the description does not clarify which of the seven heterogeneous parameters a caller should provide or expect to matter.

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