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

Annotations already cover the safety profile (readOnly, idempotent, non-destructive, closed-world), so the description's added value is scope and content. It does that: the window is capped at yesterday/today/tomorrow and it discloses what comes back (crew, a one-word whistle read, foul-trouble watch, plus score and busier/quieter comparison for last night's games). Missing: what happens when no game matches that team in the window.

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, front-loaded with the resource and its time window, then the lookup key — no wasted framing. The density is slightly marred by undefined shorthand ('the whistle read in a word', 'Monty's take') that an uninitiated agent cannot resolve.

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 simple two-parameter read tool with full schema coverage and no output schema, the description is mostly sufficient: it supplies the time window and sketches the returned fields. However, several return components are named in opaque jargon rather than explained, and the empty-result case is unaddressed.

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% and the team parameter already documents the 'Celtics'/'Boston'/'BOS' alias forms. The description repeats those examples and never mentions the optional opponent parameter, so it adds essentially no meaning beyond the schema; baseline 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?

States a specific resource and scope: the referee crew for exactly one NBA game inside a three-day window (yesterday/today/tomorrow), looked up by team. That is clearly distinct from a general referee lookup, though neither sibling (nba_referee, nba_refs_tonight) is named to make the boundary explicit.

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: 'Find it by team' with alias examples shows how to call it, and the three-day window implies when it is applicable. There is no explicit when-not guidance and no named alternative for the sibling tools, so the agent must infer the boundary itself.

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