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

No annotations are provided, so the description carries the full burden. It transparently states that a confirmed event is created on the calendar and an event.created webhook fires with a booking_page_id field. It also mentions the slot blocking behavior. This is comprehensive for a creation tool.

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?

The description is two sentences with zero wasted words. The first sentence front-loads the purpose and return value, the second adds key behavioral constraints. Perfectly concise.

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?

The description covers the main purpose, return value, webhook side effect, and slot-blocking behavior. Given the tool has 10 parameters but no output schema, the description provides enough context for an agent to understand usage, though some details about parameter interactions could be added but are not critical.

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?

The input schema has 100% description coverage, so baseline is 3. The description adds value by explaining the return value (booking_url), the effect of availability_constraints, and that existing events block slots, which goes beyond the schema's parameter descriptions.

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 clearly states the tool creates a public booking page, specifying the verb 'Create', the resource 'booking page', and the context 'for a calendar'. It distinguishes from siblings like 'create_event' by mentioning the return of a booking_url and the scheduling behavior.

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 description provides usage context: 'Set availability_constraints to restrict to weekly working hours' and 'existing calendar events always block slots'. It implies when to use (to create a scheduling link) but does not explicitly exclude other scenarios, which is minor given clarity.

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