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

Annotations already declare readOnlyHint=true, idempotentHint=true and destructiveHint=false, so the safety profile is covered. The description adds useful context by naming the payload fields (slate_id, label, date) and the 'upcoming' scope, though it omits things like whether results are paginated or how empty results appear. Solid additional context against a lower bar set by annotations.

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 tight sentences, zero filler; the purpose is front-loaded and the caller guidance follows immediately. Every clause carries independent information (scope, variants, returned fields, sequencing).

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 compensates by enumerating the returned fields (slate_id, label, date) and the workflow role, which is enough for a simple zero-param read tool. Minor gap: it does not state how to behave when no slates are upcoming or whether the list is paginated.

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 takes zero parameters, so there is nothing to disambiguate and the baseline of 4 applies. The description correctly implies a no-argument call, matching the empty input 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 ('Lists the upcoming DraftKings NFL slates') and even enumerates the slate variants (classic and showdown) plus the fields returned. It is unambiguously distinguishable from the other sport-specific list_slates siblings (mlb/mma/nhl/wnba) via the NFL qualifier.

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?

Explicitly prescribes when to call it: 'Call this first to get a slate_id for the projection, pool and showdown tools.' This tells the agent both the ordering (first) and the downstream consumers (projection, pool, showdown), which is exactly the routing guidance an agent needs.

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