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

No annotations are provided, so the description must carry the full behavioral burden. It says 'number discarded,' but there is no number parameter, and it omits permissions, side effects, return/error behavior, and what happens to the nine inputs.

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 fragment is short, but it is under-specified and misleading rather than efficiently structured. It does not front-load the actual operation the tool performs for this schema.

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, and no annotations, the description should explain purpose, usage, and behavior. It instead gives an unrelated one-line conversion fragment, leaving an agent unable to invoke it correctly.

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 schema already documents all nine parameters as strings with discard/no-disk-access notes. The description contributes no parameter meaning and is unrelated, so the high-coverage baseline of 3 applies.

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 asserts a KSI-to-megapascals conversion, but the input schema contains nine string parameters (ref, url, city, feed, etc.) and no numeric or unit field. This makes the stated purpose impossible to perform and misleading rather than clarifying.

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 when-to-use guidance, prerequisites, or alternatives to sibling shape/validation tools are provided. The only text is a conversion fragment that does not help an agent choose this tool over domain-shape, file-path-ok, validate-json, or similar siblings.

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