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

The annotations already declare readOnlyHint and openWorldHint, so the safety profile is covered. The description adds real value by scoping the payload (metadata only, no odds), which prevents a wasted call. It stops short of noting any auth, rate-limit, or caching behavior, so it is not a 5.

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, zero filler, with the payload contents and the exclusion/alternative routing front-loaded in that order. Every clause earns its place.

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 an output schema present, return-value detail is not required, and annotations cover the safety profile. The description is sufficient to select and call the tool; only id-provenance and any pagination/volatility notes are absent, which are minor given the structured fields already provided.

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 description coverage is 100% ('Numeric DraftKings event id'), so the schema carries the parameter semantics. The description restates that event_id is numeric but adds no format, sourcing, or discovery guidance (e.g., where to obtain the id), so it merely matches the schema baseline.

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 ('Fetch DraftKings event metadata by numeric event_id') and enumerates exactly what is returned: league/sport IDs, teams, status, start time. It explicitly distinguishes itself from the sibling market/context tools, so the agent can route correctly without opening a schema.

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?

Gives an explicit exclusion ('does not include odds') plus named alternatives for the two adjacent needs: draftkings_event_markets for markets and draftkings_event_context for related event data. This is textbook when/when-not/alternative guidance.

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