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

The description does disclose a meaningful privacy behavior: "No identifiers are retained." However, without annotations, it carries the full burden of explaining what happens during classification, and it does not state whether the tool is purely local, whether it calls external services, what inputs it accepts, or what side effects might occur.

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 very short and readable, with two sentences that are easy to parse. However, the opening sentence is vague enough that it does not fully earn its place; it states a classification action without defining classification outcomes.

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?

With seven diverse parameters, no annotations, and no output schema, the description needs to explain what classification means and how the tool behaves. It only provides a privacy guarantee and an opaque action, leaving critical context about input selection and return values absent.

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 descriptions for all seven parameters, so schema coverage is effectively complete. The tool description itself adds no parameter-level detail, but it also does not need to because the schema already documents each field and its disposal behavior.

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 says "Show how this request is classified" and the tool is named "compatibility," but it never explains what classification scheme is used, what categories exist, or what "compatibility" refers to. It is vague rather than tautological, but an agent cannot tell what resource is being acted on or what output to expect.

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 versus any of the many sibling tools such as domain-shape, normalize-url, validate-json, or weather-hint. The description does not give any conditions, exclusions, or alternatives, so an agent has no basis for selecting it.

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