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

Annotations already declare readOnly=true, openWorld=true, destructive=false, so the safety profile is covered. The description adds value beyond them by disclosing the credit cost (25 credits) and the shape of what comes back (body copy plus title, meta description, date, language). It omits failure behavior on paywalled, JS-rendered, or rate-limited pages, which matters for an open-world fetcher.

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?

One informative sentence plus a parenthetical cost note, with the key capability front-loaded and no filler. Minor waste in restating the tool name twice before the actual verb.

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?

An output schema exists, so enumerating return fields is a bonus rather than a requirement, and the annotations cover safety. For a simple single-argument fetch-and-extract tool the only meaningful gap is handling of non-plain-HTML pages and the cost model's implications (e.g., whether failures still bill).

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?

There is a single parameter with 100% schema description coverage, so the schema already carries the semantics. The description only reinforces that the input is a webpage URL and says nothing about formats, redirects, or query strings that would extend the schema.

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 ('converts any webpage URL into plain text stripped of HTML tags') and enumerates the returned fields. The URL-input framing distinguishes it in spirit from siblings like HTMLtoText and URLtoMarkdown, but no sibling is named or explicitly contrasted.

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?

There is no statement of when to use this over the many adjacent siblings (HTMLtoText, URLtoMarkdown, Imagetotext, WebsiteReadability, MetadataExtractor) or of prerequisites such as public accessibility. Only the implied usage from the tool's own purpose is present.

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