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

No annotations are provided, so the description carries the full behavioral burden, and it discloses nothing: no mention of what a 'limit' does, whether extraction is frequency-based, whether stopwords are removed, whether there are rate limits or auth requirements. The description is behaviorally empty.

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 text is short but only because it is a degenerate restatement of the name; there is no front-loaded purpose, no useful content, and the colon duplication wastes the one sentence available. This is under-specification rather than conciseness.

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 3-parameter tool with no annotations, no output schema, and ambiguous overlapping inputs, the description supplies none of the missing context an agent needs to invoke it correctly. It is completely inadequate.

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 nominally 100%, but the schema text is filler ('Text to process', 'Input to process', 'Limit to process'), so the high-coverage baseline does not apply in spirit. The description adds nothing, and it never resolves the ambiguity between the overlapping 'text' and 'input' parameters or explains that 'limit' (typed as a string) constrains result count.

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 is the literal string 'Keyword Extract: Keyword Extract', which merely restates the tool name. It conveys a vague verb+resource (extracting keywords) but offers no scope, no output form, and no differentiation from close siblings such as x402-keyword-density, x402-keywords, or x402-stopword-remove.

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 statement of when to use this tool versus the many keyword/text-analysis siblings, no prerequisites, and no exclusions. The agent is left to guess entirely from the name.

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