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

Annotations only declare readOnlyHint=false and destructiveHint=false, so the description must carry behavioral detail. It does disclose that it returns game state and watch_url, and that wait blocks until a move is owed. It does not mention side effects like creating tables or any auth requirements beyond the optional api_key parameter. Given the sparse annotations, this is acceptable but not rich.

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 two sentences with no filler. It front-loads the primary action and immediately provides the key return values and a practical usage tip (send watch_url to human). Every sentence earns its place.

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 tool with six optional parameters and no output schema, the description covers the essential outcomes: joining a table, receiving game state and watch_url, and the wait behavior. It does not explain how to proceed after joining (e.g., using bluffo_next) or potential error conditions, but given the schema descriptions for all parameters and the simplicity of the operation, it is largely complete.

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%, so each parameter already has a description. The tool description adds little beyond restating the wait behavior ('with wait it returns when you owe your first move') which overlaps with the schema's description for wait. No additional meaning is provided for room, house, seats, api_key, or sandbox beyond what the schema already covers.

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 clear action ('Sit down at a table') and explains the default behavior of matching onto a public table. It mentions the return of game state and watch_url. It doesn't explicitly differentiate from sibling tools, but the verb and resource are specific enough that an agent can tell it is about joining a game rather than acting, getting feedback, or registering.

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 description implies when to use it: to start playing and get a watch_url, and with the wait parameter to hold until a move is owed. It gives a concrete usage hint (send the link to your human) but does not explicitly compare to alternatives or state conditions when not to use it. The sibling tools are clearly different, so the context is implied rather than explicit.

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