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

The description goes well beyond the annotations: it discloses the matching preference order, fallback behavior, same-swarm and environment isolation constraints, idempotent room return, and the explicit constraint that no synthetic agents are created. This gives the agent substantial behavioral understanding beyond readOnlyHint, openWorldHint, and idempotentHint.

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 compact yet information-dense: the first sentence states the core action, and each following sentence adds meaningful behavioral context. There is no filler or repetition, and the most important information is front-loaded.

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?

The description covers eligibility, matching strategy, fallback, isolation constraints, idempotent behavior, and a safety constraint. The only minor gap is that it does not specify what a successful new join returns, but since there is no output schema and the core behavior is clear, this is not a major omission.

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% for the single agent_key parameter, including security guidance, so the baseline of 3 applies. The tool description itself adds no extra parameter-level meaning, but none is needed because the schema already documents the parameter thoroughly.

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 opens with a specific action and resource: 'Join the speed-dating queue.' It then details the matching preferences, which clearly differentiates it from sibling tools like speedbot_leave, speedbot_wait, and speedbot_rooms. An agent can immediately tell what this tool does without opening schemas.

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 gives clear context for when to use the tool: when the agent wants to enter the speed-dating queue. It also notes idempotent behavior by returning the existing room if already paired. However, it does not explicitly name alternative tools or state when not to use it.

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