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

Annotations cover the safety profile (readOnly, non-destructive, non-idempotent, closed-world), and the description adds genuinely non-obvious behavior: the answer is only a drawstoday.com link and carries no result, the page displays a reproducing seed, and named-game filters are all rendered simultaneously on that page. That is real context beyond the annotations, though it doesn't explain set-level randomization or any limits.

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 purpose is front-loaded, but the middle is a single run-on sentence with a fourteen-item game enumeration, and the closing sentences are dense and semi-colon chained. Nearly every clause carries information, yet the structure makes it harder to parse than it needs to be.

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 15-parameter tool with no output schema, the description does the essential work: it explains both modes, which parameters belong to which, and critically that the return value is a link rather than the numbers themselves. Minor gaps remain (e.g., how `sets` interacts with named games), but nothing blocking is missing.

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?

With 93% schema coverage the baseline is 3, but the description earns more by grouping parameters into the two modes (keep/leave_out/date/odd/sum_min/sum_max/text for named games; count/min/max/extra_count/extra_max for custom) and by explaining that `text` is written on the page and later drawn from at prismtect.com. That is meaning the schema descriptions alone don't convey.

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?

Opens with a specific verb+resource: random numbers for a lottery game, with a set-count bound. The two operating modes (named game vs. "custom") are spelled out, and the game list adds human-readable labels the enum lacks. It stops short of distinguishing itself from siblings like prismtect_number or sentence_numbers_link, which also appear to produce numbers.

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?

Guidance is implied through mode selection (name a game, or use "custom" with count/min/max) and the seed note for reproducing a prior draw, but there is no explicit when-to-use/when-not, and no routing to check_ticket or get_draw for verification. An agent can infer the usage but must reason about sibling overlap itself.

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