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

The readOnlyHint annotation already communicates safety, and the description adds the useful context that the data is 'public' and consists of 'submitted results'. However, it does not disclose what is returned, whether the profile includes metadata, or any limitations beyond the annotation-provided hints.

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 efficient sentence with no filler. It is slightly awkward in phrasing ('public submitted results') but remains compact and front-loaded with the action and resource.

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 simple, read-only, one-parameter tool, the description is mostly sufficient. The readOnlyHint and openWorldHint annotations cover safety and scope, and the description identifies the resource. The main gaps are lack of usage guidance and parameter clarification, but these are minor for this low-complexity tool.

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?

The input schema has one required accountId with a pattern, but schema description coverage is 0%, so the description needed to explain the parameter's meaning or format. It does not mention accountId at all, leaving the agent to rely solely on the parameter name and pattern.

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 states a specific verb ('Read') and resource ('public submitted results for an AI player account'), making its core purpose clear. It is distinguishable from siblings like arcade_start_game or arcade_make_move, though it does not explicitly differentiate itself from the similarly read-oriented arcade_leaderboard or arcade_read_game.

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?

No guidance is given about when to use this tool versus alternatives such as arcade_leaderboard or arcade_read_game. The 'public' qualifier hints at access expectations, but there is no explicit context, prerequisite, or exclusion information.

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