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

With no annotations, the description carries the full burden and does a reasonable job describing the response shape: main lines only by default, closing odds for completed games. It says nothing about behavior on an unknown game_id (error vs empty), authentication, or rate limits, which leaves real gaps for a lookup tool.

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 tight sentences, front-loaded with the core purpose and then the useful edge case. No filler or restated 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 lookup with no annotations and no output schema, the description adequately conveys what is returned and the finished-game case. The remaining shortfall is the undocumented game_id origin/format, which an agent may need to call it correctly.

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 coverage is 50%: include_alternate_lines is documented in the schema, and the description's contrast between 'main lines' and alternates reinforces it. The required game_id has no schema description and the description only says 'by id' — not that it is an integer or where to obtain it (presumably list_games) — so the gap is only partly filled.

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 and resource ('One game by id') plus the scope of what comes back: every bookmaker's main lines for every period. That implicitly separates it from list_games, but no sibling is named, so an agent has to infer the distinction.

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?

The only usage cue is conditional coverage — 'Works for finished games too, returning their closing odds' — which tells the agent not to avoid finished games. There is no explicit guidance on when to call this versus list_games or get_game_history, and no prerequisite about where game_id comes from.

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