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

Annotations already declare destructiveHint=true and idempotentHint=true, yet the description adds genuinely new behavioral facts: no participant charging, no billing-session settlement, and that already-closed rooms stay closed. The confirm gate and the host-only restriction are also behavioral context an agent needs before invoking a destructive tool. It does not describe the response or error conditions for a non-host caller.

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?

Five short sentences, front-loaded with the action and scope, then preconditions, then exclusions. 'Using the same close path as the website' is the weakest sentence but does convey behavioral parity, and nothing is padded.

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 destructive, no-output-schema mutation, the description covers side effects avoided (no billing settlement), coupling constraints (billing session requires the meeting screen), idempotency, and the confirm requirement. Remaining gaps — return payload and authorization failure behavior — are minor given annotations and the absence of an output schema.

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 0%, so the description must carry the parameter meaning. It explains confirm well ('Does nothing unless confirm=true'), but roomId is only implied by the word 'room' and 'hosts' — nothing about format, source, or that it comes from list_my_meeting_rooms. Partial compensation for a two-parameter tool.

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?

Specific verb and resource ('Closes a meeting room') plus a scope qualifier ('the signed-in expert hosts'), which distinguishes it from create_meeting_room and join_meeting_room in the sibling list. It stops short of naming the sibling tools an agent might confuse it with, so it is clear but not maximally differentiated.

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?

Gives an explicit precondition ('Does nothing unless confirm=true') and a clear when-not case ('A room with a live billing session must be closed from the meeting screen'), which routes the agent away from a guaranteed no-op. There is no explicit pointer to list_my_meeting_rooms for obtaining a roomId, and no statement about what to do for rooms the caller does not host.

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