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

Annotations already declare readOnlyHint=true and openWorldHint=true, so safety and network-boundary behavior are covered. The description adds only that results are 'current' and scoped to a single public section — useful framing but no detail on recency window, result count, or pagination.

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 sentence with the resource front-loaded and the parameter constraint trailing; no filler, no repetition of the schema's slug list.

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 supplies everything needed to invoke the tool: what it returns and where the required argument comes from. Only the meaning of 'current' (time window / result limit) is left implicit, which is a minor gap.

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 coverage is 100% and the single 'section' parameter is exhaustively documented with slug values, so the schema carries the semantic load. The description adds one meaningful constraint beyond the schema — that values must originate from euronews_sections rather than being free-form — which is a modest value-add over the baseline 3.

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+resource ('current Euronews headlines') and constrains scope to 'one public section', which distinguishes it from the broader euronews_news feed. It also names euronews_sections as the source of valid sections, though it doesn't explicitly contrast itself with euronews_article or euronews_news.

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 clause 'section must come from euronews_sections' gives a concrete prerequisite workflow (call euronews_sections first) that an agent can act on immediately. It stops short of saying when to choose this tool over euronews_news or euronews_article, so no explicit exclusions are offered.

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