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

Annotations already declare readOnlyHint=true and openWorldHint=true, covering the core safety profile. The description adds the useful constraint that the section must be sourced from globalnews_sections and that only public sections are accepted, but it does not add further behavioral detail such as error conditions or result shape.

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?

The description is a single front-loaded sentence with no wasted words. It states the resource and the key parameter constraint 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?

For a simple one-parameter tool with an output schema and safe read annotations, the description is largely sufficient. It states the resource and the valid source of the required parameter, though it stops short of fully documenting parameter formats.

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%, so the description must compensate for the single 'section' parameter. It does explain that valid values come from globalnews_sections, which is meaningful source semantics, but it does not provide format, examples, or accepted section identifiers.

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 states a clear resource ('headlines') and scope ('for one public section'), and names the sibling that supplies valid section values. It does not explicitly contrast itself with globalnews_news or globalnews_article, but an agent can infer its specific role from the name and description.

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 provides an important prerequisite: 'section must come from globalnews_sections.' However, it does not say when to use this tool versus globalnews_news, globalnews_article, or other sibling tools, so usage guidance remains implied rather than explicit.

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