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

Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, so the agent knows this is a safe read operation. The description adds no extra behavioral context beyond the word 'available' (e.g., no mention of timezone handling, pagination, or how availability is computed), but it does not contradict annotations. This is adequate but not enriched.

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 a single sentence of 10 words that is front-loaded with the action and resource. It is concise without sacrificing clarity, earning a perfect score for conciseness.

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 tool is a simple read-only lookup with strong annotations (readOnly, idempotent, non-destructive), a complete input schema, and an output schema present. The description fully covers the purpose and context; any return-value details are handled by the output schema. This is complete for the tool's complexity.

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%, with each parameter ('date', 'serviceId', 'staffId', 'resourceId') having a clear description. The tool description adds no parameter-specific meaning, but the schema already handles parameter semantics effectively. Baseline 3 is appropriate.

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 uses a specific verb ('Find') with a precise resource ('available booking slots') and a clear context ('for a service on a specific date'). It clearly distinguishes this from sibling tools like list_bookings or get_booking_detail by focusing on availability rather than existing bookings.

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 implies clear usage: call this when you need to find available slots for a given service and date. It gives context but does not explicitly mention alternatives or when-not-to-use scenarios. A 4 is appropriate given the simplicity of the tool and the clear contextual framing.

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