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

Annotations only declare readOnlyHint and openWorldHint, and the description adds real behavioral context: results are newest-first, pages are 1-based, and team-sport players yield an empty list rather than an error. It does not discuss rate limits or id resolution, but the additive value over annotations is genuine.

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 dense sentences: the primary capability and return shape come first, the routing caveat second. No filler, no repetition of the title.

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 paginated read with an output schema and read-only annotations, the description supplies the remaining unknowns an agent needs: the empty-list edge case, ordering, and the correct sibling for unsupported sports.

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 already documents the eight-character player id, the 1-based page range (1-300), the default, and the iterate-until-event_count-is-0 strategy. The description restates id and page without adding format or semantics beyond the schema, so the 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 verb (fetch) plus resource (one page of an individual-sport player's finished matches), names the source (Flashscore) and the covered sports. It is clearly separable from siblings like flashscore_player_fixtures and flashscore_player_match_log.

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?

Explicitly gives the negative case — football, basketball and hockey players return an empty list — and routes that case to the named alternative flashscore_player_match_log. Both when-to-use and when-not-to-use are covered.

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