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 discloses nothing: no mention of what inputs it expects, what it returns, whether it mutates state, or how it handles edge cases. The agent is left with zero behavioral information beyond the tool's name.

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, but this is severe under-specification rather than good conciseness. No sentence earns its place because no sentence carries information — the phrase is simply repeated verbatim.

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?

This tool has no parameters, no output schema, and no annotations, yet sits in a family of closely related complex-number operations. The description is completely inadequate: an agent cannot determine inputs, output format, or how this differs from its siblings. Nothing needed for correct invocation is present.

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?

Although the parameter count is 0 and the schema is empty (which normally earns a baseline of 4), the description was expected to compensate by explaining how inputs are provided. 'Complex Add: Complex Add' adds no semantic meaning whatsoever. An agent has no way to know how to supply the complex numbers to be added.

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 'Complex Add: Complex Add' is a pure tautology that merely restates the tool name. It provides no verb, no resource description, and no explanation of what the operation does. An agent seeing this alongside complex-sub, complex-mul, and complex-div learns nothing about what distinguishes 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?

There is zero guidance on when to use this tool versus the sibling tools x402-complex-sub, x402-complex-mul, x402-complex-div, or x402-complex-magnitude. The description gives no context about scenarios, prerequisites, or excluded cases.

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