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

Beyond the annotations, the description discloses irreversibility through the API, merchant-policy refusal conditions, HTTP 422 behavior, and the instruction not to retry. This is strong behavioral context for a destructive write tool.

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 front-loaded with "WRITE: cancel a booking" and then packs confirmation, policy, error handling, and endpoint details without filler. Every sentence contributes operational guidance.

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 one-parameter destructive action with rich annotations and no output schema, the description covers the essential behavior: irreversibility, policy constraints, error handling, and user confirmation. Nothing critical is missing.

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 100% and the single booking_id parameter is already documented in the schema. The description adds no additional parameter semantics beyond the endpoint path placeholder, so the baseline 3 applies.

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 states a specific verb and resource: "cancel a booking," and marks it as a WRITE operation. This clearly distinguishes it from read/list/update siblings such as agendapro_get_booking and agendapro_update_booking.

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 gives clear usage context: confirm with the user before calling, and do not retry on HTTP 422 because merchant policy refuses the cancellation. It does not explicitly name alternatives such as using update_booking for rescheduling, so it stops short of a 5.

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