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

Annotations already declare readOnlyHint=true, idempotentHint=true and openWorldHint=false, so the safety profile is covered. The description adds ordering ('newest first') and content scope (official draws, no forecasts), which is genuinely useful, but it says nothing about rate limits, freshness, or what happens for an operator with no draws.

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, with the core resource and return shape front-loaded and the scope caveat appended. Every clause carries 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?

There is no output schema, and the description compensates by enumerating the returned fields (1st, 2nd, 3rd, special, consolation), which is exactly what an agent needs to plan downstream use. The main remaining gap is the absence of any routing guidance among the four sibling result-lookup tools.

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%: both 'operator' (with its full enum) and 'limit' (range 1-30, default 10) are documented in the schema itself. The description adds no additional semantics about either 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?

The description names a specific verb (returns), the resource (one 4D operator's recent official draw results) and even enumerates the returned number categories, so the agent knows exactly what comes back. It differentiates somewhat by emphasizing 'one operator', but it never contrasts itself with near-identical siblings like get_latest_results or get_results_by_date.

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 only guidance offered is a scope boundary ('Official results only; no number recommendations or forecasts'), which is a negative constraint rather than a when-to-use signal. Nothing tells the agent when this tool should be chosen over get_latest_results, get_results_by_date, or get_other_game_results.

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