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

Annotations declare readOnlyHint=true and openWorldHint=true, so safety is already covered. The description adds a meaningful scope constraint beyond the annotations by excluding external publisher previews, clarifying that only native FotMob article bodies are retrievable. No auth or rate-limit context, but the added exclusion is genuine behavioral information.

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, no filler. The positive scope statement comes first and the exclusion second, so the most important framing is front-loaded.

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 described, and with one fully documented parameter the definition is nearly sufficient. The only missing link is which sibling tool yields the /topnews/ URLs to feed this id.

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% for the single parameter, so the baseline is 3, but the description adds value by specifying that the id must be the 'complete id-and-slug' form taken wholesale from the /topnews/<id> URL — an agent that strips the slug would fail. That format detail goes beyond the schema's wording.

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 precise verb (Fetch) and resource (full body of a FotMob-authored top-news article) and pins the exact input derivation (id-and-slug from the /topnews/ URL). It also rules out a whole class of content ('External publisher previews are not fetched'), which lets an agent distinguish it from generic news tools in the sibling list.

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 is explicit about when it applies (FotMob-authored top-news only) and how to obtain the argument (from the /topnews/ URL), which is real usage guidance. It stops short of naming a sibling tool such as fotmob_news or fotmob_latest_news that would surface those /topnews/ links, so an agent must infer the discovery path.

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