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

Annotations already declare readOnlyHint=true and openWorldHint=true, so the safety profile is covered. The description goes beyond that by disclosing the fixed page size (30), the pagination window semantics, and the concrete failure mode ('a page past the end returns not found'), which is operationally valuable context an agent cannot derive from 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?

Front-loaded with the return payload, then requirements and edge cases. It is a single dense sentence but every clause carries information; no redundant padding, though the length is near the upper bound for a two-parameter tool.

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, the description need not explain return values, and it still summarizes the merged fields. It covers the required id, pagination rules, and the not-found edge case. The only gap is absence of guidance pointing to sibling tools when a different player view is wanted.

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%, so both id and page are already documented. The description largely restates the same facts (page 0 most recent, 30 per page, not-found past the end) rather than adding new meaning such as id format or an alternative to 'follow has_next_page'. Baseline 3 is appropriate when the schema does the heavy lifting.

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?

Names a specific verb (Returns), resource (player matches/events), and enumerates the merged data (statistics, incident counts, bench flag, team). An agent knows exactly what payload to expect. It does not, however, explicitly name which sibling to use instead (e.g. sofascore_player for profile data), so it stops short of full differentiation.

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 useful conditional context ('Requires a player id', 'page 0 is the most recent window and can include upcoming fixtures', 'a page past the end returns not found'), which implies pagination usage. But there is no explicit when-to-use versus alternatives such as sofascore_player or sofascore_player_season_statistics, leaving selection to inference.

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