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, yet it only reveals that identifiers are not retained. It doesn't state whether the tool is read-only, whether it validates inputs, what side effects occur, or whether any external calls are made. The non-retention statement is useful but insufficient for a tool with no annotation coverage.

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 only two sentences with no redundant filler. The main action is front-loaded, and the privacy note adds a distinct piece of information. It is concise and well-structured, even though the content is vague.

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 has four optional parameters, no output schema, and no annotations, so the description must carry the burden of explaining what the request is and what the agent should do with the result. It doesn't define 'classified', describe return values, or clarify how the parameters (url, host, json, zone) relate to the classification. This is critically incomplete for an agent to invoke the tool correctly and interpret its response.

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 each parameter has a clear description in the schema. The tool description itself adds no parameter-level meaning beyond saying 'this request', but because the schema already documents all four parameters, the baseline of 3 applies. There's no additional semantic value from the description, but none is required given full schema coverage.

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 gives a verb and an object, but 'classified' is vague and never tied to the tool name 'compatibility' or to any concrete classification scheme. It doesn't specify what categories or dimensions are used, leaving an agent unsure what the tool actually returns or why it exists. This is more than a tautology but still fails to articulate a clear, distinctive purpose.

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?

The description provides no guidance on when to use this tool versus the siblings (citation, validate-json, normalize-url, etc.). It doesn't mention any conditions, exclusions, or alternative tools. The privacy statement 'No identifiers are retained' is about data handling, not usage context.

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