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

Annotations already declare readOnlyHint=true and destructiveHint=false, so the safety profile is clear. The description adds the specific scoping to a date, but does not disclose further behavioral traits like return format, pagination, or timezone handling. This is adequate but not exceptional given the annotation coverage.

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, well-structured sentence that is front-loaded with the key action and resource. No unnecessary words or details, achieving maximum efficiency.

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 simple read-only tool with a clear purpose and existing output schema, the description adequately covers the core functionality. It specifies the two required parameters (serviceId, date) and implies the return type (available slots). Some additional context about slot granularity or timezone could be beneficial but is not strictly needed.

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?

With 100% schema description coverage, the input schema already provides detailed explanations for all four parameters. The description adds high-level context ('for a service on a specific date') but does not enhance parameter meaning beyond what the schema already provides.

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') and resource ('available booking slots') with clear constraints ('for a service on a specific date'). It effectively distinguishes from siblings like 'list_bookings' and 'get_booking_detail' by focusing on availability slots 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 clearly states the context for use: checking availability for a service on a date. While it does not explicitly exclude alternatives or provide when-not-to-use guidance, the context is unambiguous and sufficient for an agent to understand when to invoke this tool versus others.

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