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

Annotations already declare readOnlyHint, idempotentHint, non-destructive, and closed-world, so the safety profile is covered. The description adds value beyond them by enumerating the returned fields (headline, summary, dates, URLs), which matters because there is no output schema; it stops short of stating ordering guarantees or total-available counts.

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?

One compact sentence with no filler, and the most decision-relevant word ("Newest") is front-loaded. It is arguably over-compressed, since the field list consumes the space that could have carried usage guidance.

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 single-parameter read tool with rich annotations, the definition covers purpose, scope, and return shape. The only meaningful gaps are behavioral edge cases — ordering guarantee and empty-result behavior — which are minor given the tool's simplicity.

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 100% — the single `limit` parameter is fully documented with range (1-20) and default (5). The description adds no additional meaning about the parameter, so the baseline 3 applies.

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 (White Report articles) with an explicit recency scope ("Newest") and names the payload fields returned. It implicitly distinguishes itself from search_articles by being recency-ordered rather than query-driven, but never names that sibling, so the differentiation is inferred rather than stated.

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?

Usage is only implied by the word "Newest" — an agent can infer this is the browse-what's-recent tool versus search_articles for query-based retrieval, but there is no explicit when-to-use or when-not-to-use guidance and no mention of what happens when there are no new articles.

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