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

Annotations supply only destructiveHint=true, so the description carries most of the behavioral burden. It does add non-obvious context that customer messaging is opt-in via explicit flags, which the per-field schema text conveys only piecemeal. It says nothing about whether the appointment can be edited afterwards, required permissions, or the conflict/error behavior of double-booking a slot.

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?

Two tight sentences: the purpose and the optional linkage set come first, the notification caveat second, with the raw API endpoint as a trailing detail. Nothing is padded, though the 'POST /v3/appointment' fragment is redundant for an agent that only needs the tool name.

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 14-parameter creation tool with no output schema and only destructiveHint in annotations, the description covers the conceptual shape well but is thin on outcomes: it does not say what is returned (e.g. the new appointment id) or what happens on scheduling conflicts. Adequate but with clear 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 every one of the 14 parameters is already documented in the schema, making 3 the baseline. The description only adds the framing that customer/vehicle/order/technician links are optional and co-dependent, without format or constraint detail beyond the schema.

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 and resource ('Book an appointment on the shop calendar') and enumerates the optional linkages (customer, vehicle, order, technicians). It does not name or contrast with the sibling shopmonkey_search_appointments, so an agent must infer the create-vs-find split from the name.

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?

'Confirmation/reminder messages are only sent if you ask' is a genuine usage rule about opt-in notifications, which is helpful. But there is no guidance on when to book versus when to use create_order or search_appointments, and no prerequisites (e.g. needing existing customer/vehicle ids) are stated.

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