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

No annotations are provided, so the description carries the full burden of behavioral disclosure. It does not explain what the tool returns, how the conversion works, whether there are side effects, or what 'number discarded' means.

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 short phrase, but it is under-specified rather than appropriately concise for a tool with nine parameters. It fails to front-load any useful invocation context.

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 nine optional string parameters, no annotations, and no output schema, so the description must explain a great deal. Instead it gives one vague conversion phrase that is disconnected from the entire input schema.

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 itself documents all nine parameters and establishes the baseline score of 3. The description adds no useful meaning beyond the schema and its 'number discarded' phrase does not map to any parameter.

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 states a specific conversion, 'typographic points to millimeters,' but 'number discarded' is cryptic and the schema contains no numeric input for the conversion. The purpose is not aligned with any sibling tool's actual parameter shape, leaving the agent unable to reconcile the stated operation with the tool's inputs.

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 alternatives such as calc-eval or the many shape-checking siblings. No context, prerequisites, or exclusions are provided.

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