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

Annotations already declare readOnlyHint=true and openWorldHint=true, so the safety and reach profile is covered by structured data. The description adds that results are 'public article-card metadata', hinting at the shape of the payload, but it says nothing about pagination, rate limits, freshness, or whether a missing/invalid category errors or returns empty. With annotations carrying the safety burden, this modest addition earns a 3.

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 no filler or repetition. It is efficient, though it is arguably under-specified rather than deliberately concise, which keeps it from a 5.

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?

An output schema exists, so return values need not be explained, and the one parameter is fully documented in the schema. What is missing is the routing context against the many livescore_news_* siblings, which for a single-purpose card-listing tool is the main remaining 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 description coverage is 100% and the single 'category' parameter is fully documented in the schema, including the 'all' sentinel and example relative paths. The description adds no syntax, format, or behavioral detail beyond that, so the baseline of 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?

The description names a specific resource ('LiveScore public article-card metadata') and a filter dimension ('by a top-level news category'), which is more than a tautology. However, it does not distinguish this tool from close siblings like livescore_news_feed, livescore_news_article, or livescore_news_categories, so an agent cannot tell which to pick from the description alone. It also says 'top-level' category while the schema allows deep paths such as football/team/arsenal, creating mild ambiguity about scope.

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?

There is no guidance on when to use this tool versus the four other livescore_news_* siblings (feed, article, categories, publishers). No preconditions, no exclusion of alternatives, no indication of what the response is used for. The agent is left to infer the routing decision entirely.

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