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

With no annotations provided, the description carries the full burden, and it does well: it discloses that an email invite is sent, invalid slots are rejected, and success returns a booking id plus a cancellation/rescheduling link. It could add more failure-mode detail, but the core behavioral contract is transparent.

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 compact and front-loaded, starting with the core action and the most critical prerequisite. Each sentence adds either a precondition, an optional-parameter rule, or the success return contract, with no filler.

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?

Despite 8 parameters, a nested object, no output schema, and no annotations, the description gives enough to call the tool correctly: required inputs, conditions for optional fields, keyed fieldAnswers, success return shape. The remaining details either live in the schema or are reasonably inferable from the tool's purpose.

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 coverage is only 50%, so the description meaningfully compensates by explaining email's purpose, slotId's provenance and validation, meetingType's conditional requirement, and fieldAnswers' keying by exact label. slug and name remain slightly underspecified, but they are self-evident from context.

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 opens with a specific verb and resource: 'Book a meeting on a host's page.' It clearly distinguishes booking from the sibling get/list tools by describing a creation action with confirmation/cancellation outcomes, leaving no ambiguity about what the tool does.

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?

It explicitly instructs the agent to use a slot id from list_available_times and warns that unavailable times are rejected. It also specifies when to pass meetingType and fieldAnswers. It does not explicitly mention when not to use book_meeting or mention get_booking/get_booking_page as alternatives, but the prerequisites for booking are clearly established.

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