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

Annotations already cover safety (readOnly, idempotent, non-destructive, closed-world), so the description's value-add is its disclosure of sort order (biggest gap first), row shape (each row links to the game's page), and a scope limit — only the top few disagreements are returned, with the rest living on the site. That scope truncation is genuinely useful behavioral context an agent would otherwise not know.

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 core definition, with zero filler. The final clause about every other disagreement being on crystlquant.com is slightly awkwardly phrased and the hard-coded 'three' mildly conflicts with an adjustable limit of 1-3, but neither derails comprehension.

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 two-parameter read tool with no output schema, the description covers what is returned (ranked disagreement rows), how it is ordered, and what each row contains (a link to the game page). Nothing essential for a correct call is missing.

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 enum values for sport are already fully spelled out in the schema, so the description is not needed to decode parameters. Saying 'the three upcoming games' loosely signals the default limit of 3, but it adds no new meaning about how limit or sport interact with the ranking.

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 states a specific resource and ranking: the upcoming games where CrystlQuant and the market disagree most, ordered by gap size, including cases where they pick different winners. An agent can tell this is a model-vs-market divergence list rather than a raw schedule (todays_board) or a power ranking (rankings). It stops short of naming any sibling, so 4 rather than 5.

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 by the framing — use it when you want the most contested games rather than a full board — but there is no explicit when/when-not statement and no pointer to find_game, todays_board, or rankings as alternatives. A careful agent can infer placement in the toolset, but the description does no routing work.

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