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

Goes well beyond the readOnlyHint/openWorldHint annotations by disclosing the pricing model ($0.10 USDC via x402), the verification behavior (verbatim quotes re-checked on the live page), the failure handling (claims that fail are dropped), and the no-charge-on-total-failure guarantee. These are material facts an agent cannot get from 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, front-loaded with the core action and followed by the differentiators (verification, billing). No filler or repetition; every clause carries 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?

With no output schema, the description does convey the return semantics (claims each backed by a verbatim quote) and the cost model, which is enough to call it correctly. It stops short of describing the response shape or what happens with partial successes, a minor gap for a tool whose value hinges on its cited output.

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 coverage is 100% and the two parameters are already fully documented in the schema (maxItems 5, maxLength 500). The description restates the 1-5 page bound but adds no format or syntax detail beyond what the schema provides, so baseline 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?

States a specific verb and resource ('Answers a question from 1-5 web pages you name') with an explicit scope bound. This is clearly distinguishable from siblings like check_quote (verifies a single quote) and page_text (returns raw text), since this one produces a grounded answer.

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?

Usage is implied: bring a question and 1-5 URLs when you want a cited answer. However, the description never names alternatives or states when NOT to use it (e.g., use check_quote to validate an existing quote, page_text to just read a page), so the agent must infer the routing.

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