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

Annotations already declare readOnlyHint=true and openWorldHint=true, so safety is covered. The description adds real context beyond that: it specifies the content is 'public', implying no authentication, and discloses the extraction source (NewsArticle structured data), which sets expectations about data shape and completeness.

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, front-loaded with the verb and resource, followed by routing guidance. No filler; 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 an output schema present and annotations covering safety, the description need not explain returns. It covers purpose, source, and alternatives well; only edge behavior (non-article or non-public URLs) is unaddressed.

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?

A single parameter with 100% schema description coverage, so the baseline is 3. The description reinforces that the input must be a 'canonical' URL, which adds a mild constraint beyond the schema, but offers no format or example detail.

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 (Fetch) and resource (Los Angeles Times article metadata and body paragraphs), plus the mechanism (the page's NewsArticle structured data). It also explicitly differentiates this from latimes_headlines, latimes_sections, and latimes_author, so the agent can distinguish it from siblings without opening schemas.

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?

Names three sibling tools with their distinct roles, giving clear routing context. It stops short of an explicit 'use this when you have a single article URL' condition or any exclusions, but the alternative mapping is strong.

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