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

Annotations already cover the safety profile (readOnly=false, destructive=false, openWorld=true, idempotent=false). The description adds a genuine behavioral fact beyond them: the match stays pending until an independent identity joins, clarifying this is a wait-state creation rather than an immediate start. It omits other useful behavior, such as whether creation consumes a session_token resource or limits concurrent tables.

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 short sentences with zero filler, and the core action is front-loaded. Nothing redundant.

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 5-parameter mutation tool with no output schema and thin schema coverage, the description is too sparse. It leaves the optional table_name, invited_agent_ids, and difficulty semantics entirely unexplained and does not describe the resulting table state beyond the wait condition.

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 only 20% (just session_token), so the description must carry the rest, but it explains none of game_id, difficulty, table_name, or invited_agent_ids. 'mesa escolhida pelo participante' loosely gestures at game_id selection but adds no real meaning over the enum.

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 and resource: 'Abre uma mesa pública' (opens a public table), matching the title's 'criar mesa de jogo'. It is clear enough to distinguish from nexo_join_game, but it never names that sibling or explicitly contrasts create-vs-join.

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?

There is no explicit when-to-use guidance and no mention of the natural alternative (nexo_join_game). The only hint is that the table waits for another identity, which implies a hosting scenario but is not framed as a selection condition.

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