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

Annotations already flag this as a non-read-only, idempotent, open-world write with no destructive hint. The description adds genuine behavioral context beyond that: a team member calls to confirm and the time is not final until then, which meaningfully shapes agent expectations about what happens after submission.

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?

Three short sentences, each doing work: action, post-submission behavior, and precondition. Front-loaded with the core action and free of filler, though it is terse enough to forgo any parameter or routing detail.

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 12-parameter mutation tool with no output schema, the description conveys the essential nuance (request is provisional pending a confirmation call) and the precondition for calling. Given annotations already carry the safety profile and the schema documents most parameters, remaining gaps are minor.

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 mid-range (58%), so a 3 baseline applies. The description adds no parameter-level meaning—it never explains window_start vs preferred_time, the new_customer flag, or service enum—leaving that to the schema, which does document several fields.

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?

States a specific verb+resource ('Submit an appointment request'), which is clear and distinct from the read-oriented siblings get_available_times and check_service_area. It does not explicitly name or route away from any sibling, but the mutation intent is unambiguous.

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?

'Only call this after the customer has confirmed every detail' gives an explicit precondition for invocation, and the confirmation-call note implies the appointment is provisional. It lacks an explicit named alternative (e.g., 'schedule only after get_available_times'), so it stops short of full routing guidance.

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