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

The description does add a meaningful privacy disclosure: 'No identifiers are retained.' This is valuable because several params in the schema are not explicitly stated as discarded. However, with no annotations present, the description still leaves unclear whether the tool performs external network requests or other side effects, so transparency is only partial.

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?

Two clean sentences, front-loaded with the core action and a privacy guarantee. It is appropriately terse, though it is so compressed that it sacrifices useful operational detail.

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 eight potential input parameters, many sibling tools, and no output schema, the description omits critical details: how to choose a parameter or whether they are mutually exclusive, what classification output to expect, and whether external resources are accessed. An agent cannot reliably invoke this tool from the current description alone.

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 documents each parameter individually, so the baseline is 3. The description adds value beyond the schema by framing all these parameters as forms of a single 'request' to be classified and by stating that no identifiers are retained across all of them, including url, host, and path which lack discard notes in the schema.

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') but does not explain what 'compatibility' means or what the classification looks like. It is not tautological, but it is vague and does little to distinguish this tool from sibling shape-checking tools like domain-shape or validate-json.

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 its many siblings such as normalize-url, validate-json, or file-path-ok. No conditions, alternatives, or exclusions are provided, so the agent must guess which tool applies.

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