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

Annotations already declare readOnly, idempotent, non-destructive, and closed-world, so the safety profile is covered. The description adds genuinely new behavior: an empty result set with a note when no draws occurred, and the explicit exclusion of recommendations/forecasts. Return field structure is still unspecified.

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?

Three short sentences, front-loaded with the core action, followed by the empty-result edge case and the scope exclusion. Mild redundancy between 'official 4D draw result' and 'Official results only', but nothing is padded.

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?

For a single-parameter read tool with full schema coverage and safety annotations, the description covers the main gap an agent faces: what happens on a date with no draws. Without an output schema it could say more about the per-operator result shape, but the essentials are present.

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% and the schema already documents the date format (YYYY-MM-DD) and timezone (MYT). The description only restates 'for a given calendar date' and adds no format, range, or edge-case detail beyond the schema.

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 and resource (returns 4D draw results) with clear scope qualifiers: 'every operator's' and 'for a given calendar date'. This implicitly separates it from get_operator_results (single operator) and get_latest_results (most recent), though no sibling is named explicitly.

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 a scope boundary ('official results only; no number recommendations or forecasts') but never states when to prefer this tool over get_latest_results, get_operator_results, or get_draw_schedule. Usage is implied by the date parameter rather than guided.

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