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

No annotations are provided, so the description carries the full burden of behavioral disclosure. It does add the key constraint of a 10-minute recency window, which is genuine behavioral context. However, it does not explicitly confirm read-only behavior, describe the response shape, or disclose whether permissions or room membership are required.

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 10-word sentence with zero filler. The core function and the time constraint are front-loaded, and nothing extraneous is included.

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 one-parameter tool this is adequate: an agent can infer it should pass a room key and will receive presence information. However, with no output schema, the description does not specify the return format, and it does not point to list_rooms for obtaining valid room keys, leaving minor gaps.

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 the schema already documents the room parameter as a 'room key'. The description adds no additional parameter meaning, such as where to obtain valid room keys or the expected format, 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 communicates a specific function: reporting which people have recently been present in a room, bounded by a 10-minute window. It is phrased as a question rather than a declarative verb+resource statement, but the intent is unambiguous and implicitly distinguishes it from siblings like list_rooms (room enumeration) and read_room (room state).

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 10-minute window implies a freshness-based use case, and the tool's purpose suggests it should be used when recent room presence matters. However, there is no explicit guidance on when to prefer this over read_room or other room-related siblings, and no exclusions or prerequisites are stated.

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