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

Annotations already declare readOnlyHint=true and openWorldHint=true, so the safety/access profile is covered. The description adds the response shape (upstream `data` article array and `totalItems` count), but this largely duplicates the output schema, and it says nothing about pagination behavior or rate/refresh characteristics.

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?

Two sentences, front-loaded with the operation and resource, with no filler. Slightly under-informative rather than verbose, which is a mild efficiency tradeoff rather than a structural problem.

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, return-value detail is not strictly required, and annotations cover safety. What is missing for correct selection among many fotmob_*news siblings is differentiation and any pagination/scope guidance, leaving the definition only minimally complete.

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%, so both league_id (discoverable from fotmob/leagues) and start_index offsets are already documented in the schema. The description adds no syntax or format detail beyond that and its 'feed or category' wording is slightly misaligned with the league_id parameter, so 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 verb (Fetch) and resource (FotMob football news previews) with the feed/category scope. However, it does not distinguish this tool from close siblings like fotmob_latest_news, fotmob_trending_news, or fotmob_team_news, and the 'feed or category' phrasing does not map cleanly to the required league_id parameter.

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?

Only a weak implied-use clause ('use it for current article discovery') is given; there is no explicit when-to-use, when-not-to-use, or routing to alternatives such as fotmob_latest_news or fotmob_trending_news that would otherwise be indistinguishable to an agent.

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