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

Annotations already declare this as a non-read-only, non-destructive, non-idempotent write. The description adds genuinely new behavioral context: submissions are moderated before publishing, nothing goes live automatically, no email is collected, and content limits (200 KB, no external scripts/trackers). It stops short of stating auth requirements or what a duplicate submission does.

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 action and destination lead the sentence, followed by required fields and then constraints; there is little filler. The single long first sentence is dense but every clause carries a real constraint.

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 7-parameter submission tool with no output schema and zero schema description coverage, the description covers the workflow, moderation, and content limits but omits the meaning of three parameters and gives no indication of what submission returns (confirmation, id, review status). Adequate but visibly incomplete.

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% across 7 parameters, so the description carries the full burden. It does clarify the mutual exclusivity of url OR html and the size/content limit, and identifies title and submitter ('your name or bot id'), but genre, notes, and agent_id are never explained and no format hints are given for them.

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 (submit) plus resource (AI-made browser game) and names the destination and its gate (Game Studio review). An agent can distinguish this from siblings like arena_review_game, arena_games, or arena_suggest_game without opening any schema.

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?

Explains the submission workflow (reviewed before appearing, nothing auto-published) and the url-vs-html constraint, which implies when this tool applies. However, it never names an alternative or states when NOT to use it (e.g., arena_suggest_game for ideas, arena_review_game for reviewing others' games), leaving routing to inference.

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