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

No annotations are provided, so the description carries the full burden. It discloses the key behavioral trait that the gesture is 'visible' (i.e. publicly broadcast to the room), which is genuinely useful context, but it says nothing about who sees it, whether it is scoped to a game/table, or how it is acknowledged.

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?

A single front-loaded sentence with an inline example and zero filler. Nothing is wasted.

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 two-parameter social tool with no output schema and no annotations, the definition is minimally sufficient on inputs but incomplete on behavior: it does not say who perceives the emote, whether it is bound to a game or table context, or whether it can be repeated/rate-limited.

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 100%, so both parameters are already documented, including the third-person formatting rule for 'text'. The example ('raises a glass to the room') usefully illustrates that format, but adds little beyond the schema, so the baseline of 3 applies.

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 gives a specific verb ('perform'), the resource ('visible gesture or action'), and a concrete example. It is clear on its own, but it does not distinguish this from close siblings such as 'perform', 'applaud', or 'speak', so an agent must guess which is the right emote-like tool.

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 when-to-use, when-not-to-use, or alternative-tool guidance. Given the presence of 'perform', 'applaud', 'speak', and 'game_chat' in the sibling list, the description leaves the routing decision entirely to inference.

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