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

Annotations already declare readOnlyHint=true and openWorldHint=true, so safety and openness are covered. The description adds useful context by listing what the profile includes, but it does not disclose behavior for invalid slugs, missing players, or freshness of season stats and match data.

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 description is a single front-loaded sentence with no wasted text. The resource, identifier, and returned contents are all stated efficiently.

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 one-parameter read-only lookup with no output schema, the description is largely complete: it explains the identifier format and enumerates the returned profile sections. The main remaining gap is not saying where valid slugs come from, but the core call semantics are covered.

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 0%, so the description must carry the semantic burden for the single slug parameter. It does so by identifying slug as the player-profile key and providing a concrete example ('bukayo-saka'), though it does not specify case sensitivity or slug source.

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 clearly states it returns a player profile keyed by slug, and it enumerates the profile contents: position, nationality, season stats, recent matches, and next match. This distinguishes it from search-oriented siblings like find_players, though it does not explicitly name alternatives or contrast with get_player_match_stats.

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 'by slug' and the player-profile framing, but the description gives no explicit guidance on when to choose this over find_players or get_player_match_stats. It also does not state prerequisites such as where to obtain a valid slug.

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