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

With no annotations, the description carries full burden. It discloses that slot times are in the venue's timezone, not the directory's. This is a useful behavioral trait. However, it does not mention pagination, rate limits, or what happens when no slots are available.

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, front-loaded with the purpose. Every sentence provides essential information without redundancy. It is highly efficient.

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?

Given the tool's simplicity (no output schema, 3 parameters), the description covers the main behavioral aspects. It could be improved by briefly noting the response format or limitations, but for a straightforward availability check, it is complete enough.

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?

Input schema coverage is 100%, so baseline is 3. The description adds value by linking serviceId to list_booking_services, specifying date format, and emphasizing consistency of place_slug. This provides context beyond the schema 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 retrieves available time slots for a bookable service on a given date, using specific verbs ('Get available time slots') and resource ('bookable service'). It distinguishes from siblings like create_booking (which creates bookings) and get_showtimes (which handles movie times).

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 explicit guidance: pass serviceId from list_booking_services and date in YYYY-MM-DD, and use the same place_slug. It implies when to use this tool (to check availability before booking) but does not explicitly state when not to use it or alternatives.

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