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

Annotations already declare readOnlyHint=true and openWorldHint=true, so safety and open-world nature are covered. The description adds 'current' (freshness) and 'public section' (scope limitation), which is useful context, but no pagination, rate, or auth behavior is described. Adequate against an already-covered annotation bar.

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?

A single front-loaded sentence with zero filler; the scope and the section constraint are stated immediately.

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?

Output schema exists so return values need not be explained, and annotations carry the safety profile. For a one-parameter read tool, the description gives everything needed to call it correctly.

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 0% and there is no enum, so the description must compensate. It does by specifying the valid-value source (skynews_sections) and restricting to 'public' sections, adding real meaning beyond the bare string parameter.

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 resource (Sky News headlines), scope (current, one public section), and names skynews_sections as the source of the section value. This differentiates it from sibling headlines-of-other-outlets and from skynews_sections itself, though it doesn't contrast against skynews_news/article.

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?

Gives a clear prerequisite/routing instruction: 'section must come from skynews_sections', telling the agent to resolve valid values via that sibling first. No explicit when-not or alternative-selection guidance, but the dependency is unambiguous.

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