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

Annotations already establish readOnly, idempotent and non-destructive behavior, so the safety profile is covered. The description adds genuine behavioral context beyond that: exactly what is removed during extraction (navigation, header, footer, sidebars, cookie bars, scripts), the markdown heading format, and the word-count output. It does not mention truncation behavior relative to max_chars.

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 tight sentences: the first front-loads what the tool returns, the second covers when to use it. No filler, though the parenthetical list of stripped elements is slightly long.

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 correctly carries the return-value burden by describing the cleaned text, markdown headings and word count. Annotations cover safety. The main remaining gap is that the url parameter and truncation behavior against max_chars are left to the schema.

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 only 50%: max_chars is documented ('Default 20000, max 60000') while url is undocumented. The description adds no parameter-level detail, offering nothing about URL format or truncation semantics, so it does not compensate for the coverage gap.

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 specifies the resource (a page's main content) and the precise output form (clean text with markdown headings, boilerplate stripped, plus a word count), which clearly separates it from link- or audit-style siblings like page_links or page_audit. It stops short of naming an alternative tool, so it is clear but not fully differentiated from 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?

It gives concrete when-to-use guidance: reviewing or comparing content (own or competitor's), checking keyword use, or drafting an improved version. There is no explicit when-not or named alternative, but the usage context is unambiguous.

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