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

It discloses meaningful behavior beyond the annotations: it removes scripts/styles/navigation noise, returns bounded Markdown, includes canonical URL and provenance, and has a $0.01 x402 price. IdempotentHint and destructiveHint already cover retry safety; no contradiction with annotations.

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?

Two sentences with no filler. The first sentence states the core operation, transformation, and output; the second provides pricing and the optional operation-id recommendation. It is front-loaded and every sentence earns its place.

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 paid x402 tool with no output schema, the description adequately names the return components and cost, while the input schema covers the payment handoff fields. Minor gaps remain around max_chars defaults and the exact provenance structure, but an agent has enough to invoke it 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?

Schema description coverage is 60%, with three x402/salt fields already described. The description reinforces _salt19_operation_id as recommended and hints at max_chars through 'bounded', but it does not explain max_chars behavior or default, and url has no description in the schema or the tool description.

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 names a specific action ('Fetch'), a clear resource ('a public web page'), and a concrete outcome ('LLM-friendly Markdown plus canonical URL and fetch provenance'). It also mentions noise removal and output bounding, which distinguishes it from sibling tools like url-http-preflight.

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?

The description provides clear context: use this when you need a cleaned, bounded Markdown version of a public web page, with a stated price. It does not explicitly contrast with sibling tools such as url-http-preflight or explain when not to use it, but the intended use case is evident.

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