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

Annotations only declare non-read-only, non-destructive, non-idempotent, open-world; the description adds real context beyond that: the required bookings:write scope, the fact that call one is a no-op dry run, that unknown fields are refused by name, and that a confirm_token is mandatory for the mutation. It does not describe the outcome of the second call (whether the request lands as pending, what identifier comes back), which is a notable gap for a mutation tool with no output schema.

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 short sentences, front-loaded with the action, then the auth requirement, then the two-call protocol. Nothing is padded and every clause carries information an agent needs before invoking.

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 13-parameter mutation with no output schema, the description covers the authorization requirement and the full confirmation protocol, which is the hardest part to get right. It leaves the second call's return value and the pending-vs-confirmed outcome unstated, and gives no sibling routing, so it is strong but not complete.

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 13 parameters is already documented in the schema, including confirm_token's two-call semantics. The description reinforces how confirm_token pairs with the first call's response but adds no field-level meaning the schema does not already carry; baseline 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 opens with a specific verb+resource ('Request a DJ') and immediately characterizes it as a two-phase confirmation flow, which separates it from a plain create. It never names the near-siblings it must be distinguished from (book_dj, preview_booking_request, create_sourced_booking), so an agent still has to infer which of those overlapping tools to pick.

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 when-to-use flow is unusually explicit: first call validates and returns a summary plus confirm_token, the human must agree, then a second call with the same arguments plus the token. What is missing is routing guidance against alternatives that appear to do similar things, so the agent knows this is the right tool versus preview_booking_request or book_dj.

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