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 says nothing about whether validation is read-only, what happens on malformed HTML, whether it throws or returns a list of issues, or what the accessibility checks cover. 'Tag matching + accessibility checks' is a topic label, not behavioral disclosure.

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?

A single compact line with no filler; the name-plus-capabilities format is front-loaded. It is under-specified rather than bloated, so the terseness itself is not penalized.

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 no annotations, no output schema, three interchangeable optional parameters, and a one-line description, an agent cannot confidently construct a call or anticipate a result. A validator tool needs at minimum an input-selection rule and a hint about the return shape.

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%, so the baseline is 3. However the schema text ('Html to process', 'Text to process', 'Input to process') is vacuous and the description does nothing to disambiguate which of the three optional, overlapping inputs should be supplied.

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?

States the resource (HTML) and two capabilities (tag matching, accessibility checks), so the agent knows roughly what it returns. But it's a fragment, not a sentence, and gives no indication of output shape or how it differs from near-siblings like x402-accessibility-check or x402-validate.

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?

No when-to-use guidance, no prerequisites, no mention of alternatives. With sibling tools such as x402-accessibility-check, x402-strip-tags, and x402-validate competing for the same job, the agent gets zero routing help.

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