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

With no annotations present, the description carries the full burden of disclosing side effects. It states 'No identifiers are retained,' which addresses data retention, but it does not disclose whether the tool is read-only, makes network calls, or what happens when inputs are rejected. The behavioral contract is only partially revealed.

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 a single, tightly worded sentence with the verb and subject front-loaded. It avoids redundancy and is appropriately sized for the information it conveys. The only drawback is that it is concise to the point of underspecification, but that is a completeness issue rather than a structure issue.

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?

Given 9 parameters, no output schema, and no annotations, the description is too thin to be contextually complete. It does not explain how the parameters combine, what the classification result looks like, or what the caller should do with the output. The privacy note is helpful but does not fill the missing functional context.

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 coverage is 100%, so the baseline is 3. The tool description adds minimal cross-parameter meaning beyond what the schema already provides; 'No identifiers are retained' hints at a privacy posture but does not explain how the nine disparate parameters relate to the classification output. No schema gaps exist that the description needed to fill.

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' names a verb and subject, but 'classified' is ambiguous. Given the tool name 'compatibility' and the mix of URL, Git ref, timezone, JSON, path, and search parameters, it is unclear what classification output the caller should expect. The purpose is stated but not sufficiently specific to confidently select this tool.

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 provided on when to use this tool versus any of the 27 sibling tools. The description makes no reference to alternatives such as normalize-url, validate-json, iana-zones, or search-query-len, leaving the caller to guess which tool fits their scenario.

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