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

Annotations already declare readOnlyHint=true and openWorldHint=true, so the safety profile is covered and the bar is lower. The description still adds real behavioral context beyond the annotations: the 'up to 21' result cap, the 'current' freshness expectation, and that the source is a single category JSON feed. It does not describe the response shape, but an output schema exists so that is acceptable.

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: the action and result come first, followed by the parameter prerequisite. No filler or redundant restatement of the tool name.

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 only needs to convey purpose, scope, and the parameter prerequisite - all of which it does. The only mild gap is the absence of explicit guidance distinguishing this from the sibling news/article tools.

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% for the single 'section' parameter, so the description must compensate - and it does, specifying that the value is a slug obtained from dailymaverick_sections. This meaningfully clarifies the parameter's origin and expected format beyond the bare string type in the schema, though it stops short of further validation details.

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 (Daily Maverick article cards) with concrete scope: 'up to 21 current' from 'one category JSON feed.' It also routes the agent to the dailymaverick_sections sibling as the source of the required slug, so it is distinguishable from its siblings without opening any schema.

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?

The description gives a clear prerequisite - the section value must be 'a slug returned by dailymaverick_sections' - which is genuinely useful workflow guidance. However, it never says when to use this headlines tool versus the sibling dailymaverick_news or dailymaverick_article, so the when-to-use comparison is only implied.

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