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

No annotations are provided, and the description does not explain expected return values, error behavior, side effects, or how inputs are processed. The actual runtime behavior is largely undefined.

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 brief and front-loaded with the main purpose, but the second sentence is ambiguous and provides little value. It is concise but not effectively clear.

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?

With nine optional unrelated parameters and no output schema, the description does not tell an agent what to provide or what to expect in return. It is not sufficient to call the tool 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?

Each parameter has an individual schema description, but those descriptions are unrelated to arithmetic evaluation. None of the nine parameters plausibly represents an expression, so the mapping between the tool description and the input schema is broken.

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 evaluates a+b-style arithmetic, but no parameter is provided for the expression. The schema contains only unrelated optional fields such as URLs, timezones, and file paths, making the actual purpose unclear.

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 sibling tools, no examples, and no indication which parameter should contain the arithmetic expression. The phrase 'Expression discarded' adds confusion rather than instruction.

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