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

With no annotations, the description must carry the full disclosure burden, but it only states 'No identifiers are retained.' It does not disclose side effects, whether the operation is read-only, whether the url is fetched, or what is actually done with the inputs. No contradiction exists, but the disclosure is minimal.

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 consists of two short sentences and is front-loaded with the purpose statement. The privacy note is relevant, though terse. It is compact with no filler, but the purpose sentence's vagueness costs it a 5.

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 no output schema and no annotations, the agent needs to know what 'classified' returns and how the four optional inputs shape the request. The description leaves this undefined, and the schema only names the inputs without explaining their combination. Completeness is inadequate for correct invocation.

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 all four parameters individually. The description adds no cross-parameter meaning: it does not explain how url, host, json, and zone relate to the classification or whether they are mutually exclusive. Baseline 3 is appropriate.

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,' which names a weak verb ('show') and an undefined resource ('this request'). It never defines what 'compatibility' means or what the classification output looks like, and it does not differentiate from siblings such as normalize or validate. It is vague rather than tautological.

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 on when to use compatibility versus the siblings citation, domain-shape, normalize, or validate. Nothing states whether url, host, json, and zone are alternatives or combined, so the agent cannot infer selection conditions. There is no exclusion or prerequisite information.

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