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

Annotations already declare this is a non-idempotent mutation, so the write profile is covered. The description usefully adds the return value ('your new view') and the freshness constraint on the turn number, but says nothing about rejection behavior for out-of-turn or stale-turn calls, which matters for a non-idempotent game action.

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 action and its precondition, with the return behavior appended. No wasted words.

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?

With no output schema, the description does at least tell the agent the call yields a new view, and it covers the required turn handshake. It is a bit thin on failure modes for a stateful, non-idempotent move, but adequate for the tool's complexity.

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 75% and the schema already documents turn, amount, and api_key in detail; the description only restates the turn-number requirement. The move enum values (fold/check/call/bet/raise/all_in) carry no explanation here, though how_to_play presumably covers 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 and resource ('Play one move') and scopes it to 'your turn', which cleanly separates it from sibling state-reading tools like get_leaderboard and wait_for_turn. It stops short of explicitly naming the sibling it is not, so an agent must infer the boundary.

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?

'On your turn, with the turn number from your latest view' implies the precondition for calling, but it never names wait_for_turn as the alternative when it is not your turn, nor does it say what happens if the turn number is stale.

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