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

Annotations declare readOnlyHint=true and openWorldHint=true, so safety is covered. The description adds behavioral context by stating the links are public and by explicitly excluding games, promotions, winners, jackpots, and account data. It does not describe pagination or return shape, but an output schema exists and the scope is otherwise well communicated.

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 sentences and zero waste. The main action is front-loaded, followed by alternative tools and exclusions, which is the right order for an agent deciding whether to invoke it.

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?

Given zero parameters, existing annotations, and a present output schema, the description is complete enough to call the tool correctly. It explains what is returned at a high level, what is excluded, and where to go for the two most likely adjacent needs.

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?

The tool has zero parameters, so there are no parameter semantics to explain; baseline for 0 params is 4. Schema description coverage is 100% but there are no inputs to document, so the description neither needs to nor does add param detail.

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 uses a specific verb and resource: 'List the public Online Slots and How to Play Slots links from the DraftKings Casino homepage.' It clearly scopes what is included and names sibling tools to differentiate the resource. An agent can immediately tell this is a link/entry-page discovery tool, not a game or category listing.

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 explicit usage guidance: 'Use it to discover the entry pages; use draftkings_casino_slots_categories for Slots section IDs or draftkings_casino_slots_guide for rules.' It also states exclusions (games, promotions, winners, jackpots, account data), making both when-to-use and when-not-to-use clear.

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