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

With no annotations provided, the description carries the full burden of behavioral disclosure. It transparently covers the $0.001 USDC cost, x402 payment mechanism, no-API-key requirement, and the 402 response when payment is absent. It does not detail the exact structure of 'normalized text metadata' or rate limits, but the key operational behaviors are disclosed.

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?

Three sentences with no wasted words: the action, use case, pricing, failure mode, and free alternatives are all packed efficiently. The primary purpose is front-loaded in the first sentence, and every subsequent sentence adds actionable information.

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 fetch tool, the description covers purpose, pricing, auth, failure behavior, and free alternatives. The lack of an output schema is partially mitigated by 'normalized text metadata,' though a bit more detail about the return format would make it fully complete. Overall, an agent has enough context to decide whether and how to invoke it.

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?

The input schema already fully documents the only parameter, 'url', as a public http(s) page URL, so schema coverage is 100%. The description reinforces that the page must be public and mentions normalized text metadata, but it does not add new parameter-level semantics beyond what the schema already provides. A baseline of 3 is appropriate.

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 opens with a clear verb and resource: 'Fetch a public web page now and return normalized text metadata.' This states exactly what the tool does and distinguishes it from sibling tools like check_sec_filings or check_rss_feed. The phrase 'Use for a one-session lookup' also separates it from the watch_* persistent-monitoring siblings.

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 explicitly says to use it for a one-session lookup, which gives a clear when-to-use signal. It also mentions free alternatives for demo/trial purposes, which helps agents avoid unnecessary paid calls. However, it does not explicitly name watch_web_page as the alternative for ongoing monitoring, leaving that connection implicit.

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