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

Annotations already declare readOnlyHint=true and openWorldHint=true, and the description adds genuinely new behavior: the exact shape of a snapshot (ordered teams, points, week-over-week change tokens like `+1`/`new`/`-`), that dates are typically Mondays, and that an unpublished date returns a 404. That 404 disclosure is the kind of failure-mode detail annotations cannot convey.

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?

The opening sentence is front-loaded and the date/404 guidance is well placed, but the long clause enumerating every returned field (rank, id, name, logo, points, change, five players with profile URLs) largely restates the output schema, which exists for this tool. Trimming that enumeration would make the definition tighter without losing decision-relevant information.

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, the description needn't enumerate return fields, yet it covers the important gaps: current-vs-historical date handling, date format, and 404 behavior. Only the `country` region selector is unaddressed in prose, and the schema covers it adequately.

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%, so the baseline is 3, but the description goes beyond it by explaining the omit-vs-supply semantics of `date`, the expected `YYYY-MM-DD`/Monday convention, and the 404 outcome for a missing snapshot. The `country` parameter is left entirely to the schema, which keeps this from a 5.

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 definition names a specific verb and resource ("Get the HLTV world team ranking") and scopes it to a single Counter-Strike ranking snapshot, so an agent knows exactly what it retrieves. It does not explicitly contrast itself with the similarly named sibling hltv_valve_ranking, which is the one ambiguity a reader must resolve from the HLTV-vs-Valve wording alone.

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 gives clear conditional guidance for the core parameter: omit `date` for the current ranking, supply `YYYY-MM-DD` to read an older one. It offers no guidance on when to choose this tool over alternatives such as hltv_valve_ranking or hltv_team, and says nothing about the `country` selector's use case.

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