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

With no annotations provided, the description does not disclose behavioral traits such as read-only nature, required permissions, or potential side effects. It only describes the return value, lacking transparency about idempotency or rate limits.

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 exceptionally concise, with two sentences that front-load the primary purpose and provide actionable context for output usage. Every sentence serves a clear function without waste.

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 explains the return format (ISO timestamps) and its integration with book_appointment, but does not address edge cases like no available slots, pagination, or timezone handling (though timezone is a parameter). Given no output schema, this is adequate but has gaps.

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 descriptions cover all four parameters with 100% coverage, so the description does not need to add parameter details. The description adds a usage note about output integration with book_appointment, but this does not enhance parameter semantics beyond the schema.

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 verb 'Get' and the resource 'open appointment slots' for a business on a specific date. It effectively conveys the tool's purpose and its role in the booking workflow, but does not explicitly distinguish from sibling tools like book_appointment or cancel_appointment.

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 usage before booking an appointment by stating 'Use these start_time/end_time values when calling book_appointment.' However, it does not explicitly provide when-to-use guidelines, exclusions, or alternatives.

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