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

Annotations already flag destructiveHint=true; the description adds valuable side-effect context: cancellation triggers attendee email and a booking.cancelled integration event, while completed/no_show are internal-only. It stops slightly short of spelling out whether the underlying booking is deleted or merely marked, so a 4 is appropriate.

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?

Four sentences, each earning its place: purpose, conditions, side effects, and alternative. The most decision-relevant constraint is front-loaded and there is no filler or repetition.

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?

Given the output schema and annotations, the description covers the operation, preconditions, side-effect differences, and sibling routing. There is no gap that would leave an agent guessing about how or when to call this tool.

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?

With 100% schema coverage, the baseline is 3. The description still adds real meaning beyond the schema by explaining the preconditions tied to each status value ('Only works on ... scheduled; completed / no_show additionally require the meeting to have already started'), which helps an agent choose the correct status. This justifies a 4 rather than a 3.

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 uses specific verbs and a resource ('Close out a confirmed booking of the current team'), lists the three status transitions, and explicitly differentiates from review_booking. An agent knows exactly what this tool does and what it is not for.

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?

It gives explicit applicability conditions ('Only works on a booking whose status is scheduled; completed / no_show additionally require the meeting to have already started') and a pointer to the correct alternative ('To handle a pending request use review_booking instead'). This is textbook when/when-not guidance.

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