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 adds the return content (both teams, used players, batting order, stats), but since an output schema exists this is partly redundant and no auth, rate-limit, or staleness context is given.

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 sentences, front-loaded with the core action and no filler. The trailing content enumeration is slightly long but still earns its place by signaling what the response contains.

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 read-only single-parameter fetch with a full output schema, the description covers the action, the input source, and the response shape. Nothing critical is missing, though differentiation from sibling game tools is absent.

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 100% and there is a single parameter, so the schema already documents 'id' as a numeric MLB game id. The description only restates 'by game ID' and adds no format or lookup detail beyond the schema, matching the baseline.

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 ('Fetch an MLB game boxscore by game ID') and enumerates the returned content, so an agent knows exactly what it produces. It does not explicitly differentiate itself from close siblings like mlb_game or mlb_game_play_by_play, which keeps it from 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?

Provides a concrete prerequisite: 'use the date or schedule tools to find a game ID first,' naming the alternative tools that supply the required input. It gives no when-not-to-use guidance, so it stops short of a 5.

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