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

With no annotations, the description bears full responsibility for disclosing side effects and operational behavior. It only promises not to retain identifiers, but it does not state whether the tool is read-only, whether it performs network calls, whether it can error, or what it does with the provided data.

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 concise at two sentences, but the first sentence is semantically weak and the second is a privacy note rather than a functional explanation. It is short, but not well-structured for conveying the tool's behavior.

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 highly underspecified: no output schema, no annotations, 9 heterogeneous optional parameters, and no explanation of what 'classified' means or how the result is presented. An agent cannot determine what to pass, what to expect, or why this tool exists alongside its siblings.

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 schema already documents each of the 9 parameters clearly (e.g., 'Git ref name', 'HTTPS URL', 'IANA timezone name') with 100% coverage. The description adds no additional parameter semantics, so a baseline score of 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 'Show how this request is classified' is too vague to convey the tool's actual purpose or output. The name 'compatibility' and the unrelated optional parameters (ref, url, city, feed, etc.) do not clarify what compatibility is being assessed or what classification result is returned.

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 on when to use this tool versus the many sibling tools such as normalize-url, validate-json, or domain-shape. The description only states a privacy property ('No identifiers are retained') and never mentions conditions, alternatives, or prerequisites.

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