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

No annotations are provided, so the description carries the full burden. It discloses nothing about behavior: no mention of input handling, return shape, or that four parameters exist and which matter. The definition is silent on all behavioral traits.

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 single sentence is short, but it is redundant rather than concise, repeating the tool name without adding information. It is under-specified, not efficient.

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 four ambiguous, non-required parameters, no annotations, and no output schema, the description provides nothing an agent needs to invoke it correctly. The purpose, inputs, and output are all left unexplained.

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 coverage is 100%, so the baseline would be 3, but the schema itself provides near-meaningless descriptions ('Input to process', 'Term to process'). The tool description adds no meaning about how term/text/input/keyword differ or which are required, leaving four ambiguous overlapping parameters unresolved.

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 'Keyword Density: Density of keyword.' is essentially a tautology that restates the tool name. It names the concept but provides no specific verb or resource beyond what the name already conveys, and gives no differentiation from siblings like x402-word-density or x402-keyword-extract.

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 whatsoever on when to use this tool, when not to, or which siblings to prefer. The description offers no context for selection.

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