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

The statement 'No identifiers are retained' is a useful behavioral guarantee, especially since there are no annotations to communicate this. However, the description does not disclose whether the tool is read-only, what side effects exist, or what happens to the input after classification, so behavioral transparency is only partially addressed.

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 short and front-loaded, with no wasted words. However, it is so terse that the first sentence sacrifices necessary specificity, making the brevity less useful than it could be.

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?

For a tool with nine optional parameters, no output schema, no annotations, and many closely related sibling tools, this description is critically incomplete. It does not explain what classifications are possible, how parameters are used, what the output looks like, or which sibling cases this tool is meant to handle.

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 input schema already documents all nine parameters well. The tool description adds no parameter-level meaning, but the schema carries that burden, making a baseline score of 3 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 the tool will 'Show how this request is classified,' which indicates a rough purpose, but 'classified' is never defined and the tool name 'compatibility' is not explained. It does not distinguish this tool from sibling classifiers like domain-shape, validate-json, or search-query-len.

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 the 26 sibling tools. The description gives no conditions, exclusions, or alternatives, leaving an agent to guess which request classification scenarios should route here.

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