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

Annotations already cover read-only, idempotent, non-destructive, closed-world behavior, so the bar is lower. The description still adds real value by disclosing return content (a block/no-block determination plus a legal basis 'where one exists') and by framing the result as site policy rather than legal advice.

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 repetition of the title, and the core purpose is front-loaded ahead of the scope-limiting caveat. Nothing wastes space.

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 no output schema, the description carries the burden of describing return values, and it does so adequately (block status plus optional legal basis). Minor gaps remain: it doesn't say what the legal-basis field looks like when none exists, nor whether results are cached or how quickly policy changes propagate.

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?

One parameter with 100% schema description coverage; the schema itself documents accepted formats ('TX' or 'California'). The description adds no additional semantics about the state input, so the baseline of 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?

Specific verb (return whether...blocks) plus a well-defined resource (sweepstakes casino offer policy per US state), scoped to the Social Casino Index site. It is clearly distinct in kind from the sibling casino-listing tools, though it never names them to draw the contrast 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?

Usage is implied rather than stated: an agent can infer this is the tool to call when gating offers by state. The 'site offer policy, not legal advice' line clarifies how to interpret the answer but gives no when-to-use versus when-not guidance or alternatives.

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