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

Annotations already declare readOnly/idempotent/non-destructive/openWorld, so the safety profile is covered. The description adds genuinely new operational context: access and delay follow the connected account, usage is metered, it is one bounded request with no retry, and affiliate 27 is excluded. It does not describe pagination or response size limits.

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?

The purpose is front-loaded, which is good, but the first sentence is missing terminal punctuation and the rest is a run-on of generic disclaimers ('No wagers, account changes or guarantee of returns') that are only loosely relevant to a read-only stats lookup.

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?

An output schema exists so return values need no explanation, and the account-scoping and exclusion notes are useful. However, for a nested two-parameter tool with 0% schema coverage, the description leaves the required path structure and the stats/player ID semantics entirely to the schema.

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 reported at 0%, so the description must carry parameter meaning, but it only alludes to canonical IDs and never mentions eventID, stats_ids, or player_ids, nor their cardinality limits (12 stats / 6 players). An agent must open the schema to learn the required nested path and comma-separated format.

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 opening clause states a specific verb, resource and scope: 'Get player game stats for an event'. Combined with the name, an agent can separate it from v2GetStatsByEvent (event-level stats) and v2GetPlayerStatsByTeam (team-scoped player stats). It does not explicitly name a sibling to route away from, so it stops short of a 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?

It gives real usage constraints ('Use returned canonical IDs', 'never infer coverage from an empty result', 'no background polling or automatic retry') but never says when to pick this over v2GetStatsByEvent or v2GetPlayerStatsByTeam, which are the closest alternatives. Usage context is implied rather than routed.

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