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

Despite destructiveHint=true already flagging the mutation, the description adds substantial behavior the annotation cannot convey: the reservation SYNCS blocked dates to every connected channel (Airbnb, Booking.com), it fails on overlapping dates, and there is no cancel path in this server. It also warns that required guest fields vary with booking-tool 'Form Content' settings — a non-obvious precondition.

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, all load-bearing, with the highest-risk facts (channel sync, overlap failure, no cancel) front-loaded before the conditional field note and endpoint reference. No filler or restatement of the title.

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?

With 23 params, nested price_elements, a destructive annotation and no output schema, the description covers creation semantics, side effects and failure modes well. It does not state what the call returns (presumably a reservation id needed for subsequent get/update calls), which is the only meaningful gap for a mutation with no 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 coverage is 100%, so parameters are self-documented (including channel_id's default of 70 and the 11 = Blocked channel hint). The description still adds value by framing the 3 required vs. guest-field requirements as configuration-dependent, which the schema alone would mislead an agent about.

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?

Opens with a specific verb+resource ('Create a reservation (or a blocked period) on a property') and immediately clarifies that the created record behaves like a channel booking, distinguishing it from the read/list siblings. An agent can identify what the tool produces without opening the schema.

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 clear conditions: fails if dates overlap an existing booking, and this server offers no cancel so cancellation must happen in Smoobu. Useful when-not guidance, but it never explicitly points to smoobu_check_availability to pre-validate dates or smoobu_update_reservation for modification, so routing to siblings is left implicit.

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