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

With annotations only declaring readOnlyHint and openWorldHint, the description adds substantial non-obvious behavior: no JS/browser execution (so script-rendered pages will fail), a mandatory host-approval gate, a $0.01 USDC charge on Base per successful call, and an x402-capable wallet requirement. These are exactly the preconditions an agent needs and are not derivable from annotations or schema.

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?

Four short sentences, purpose front-loaded, with each subsequent sentence adding a distinct operational constraint (no scripts, approval gate, price, wallet requirement). No filler or repetition.

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 single-parameter read-only fetch with no output schema, the description covers the safety profile, cost, and access prerequisites well enough to call correctly. It omits output details such as size/page limits and what happens on non-HTML or script-dependent content, which is a modest gap given there is no output schema to lean on.

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?

Only one parameter exists and schema description coverage is 100%, so the schema already documents that the url must be an absolute HTTPS URL on an approved host with no query strings. The description's 'one document' and 'hosts must be approved' phrasing largely restates that constraint rather than adding syntax or format detail, so the baseline 3 applies.

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 a specific verb (convert), a precise resource (one public technical HTML document to Markdown), and draws boundaries (operator-approved, no personal pages). It is clearly distinguishable from the closest sibling, browser-feature-lookup, since it explicitly says no browser or scripts are involved.

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?

Gives clear conditions: one document per call, public technical pages only, no personal pages, and hosts must be approved before use. It stops short of naming an alternative tool for other cases (e.g., where to go for unapproved or personal pages), so it lacks explicit when-not/alternative routing.

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