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

Goes well beyond the annotations (readOnlyHint=false, destructiveHint=false, idempotentHint=false, openWorldHint=true) by disclosing that nothing is confirmed until the business responds, that no payment is taken, and the exact follow-up sequence of customer emails. For an open-world non-idempotent mutation, this is exactly the context an agent needs.

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?

Front-loads purpose, then inputs, then what happens next in a logical progression. It is somewhat long with repeated '904 Digital Media' phrasing, but every sentence carries information an agent needs; minor redundancy only.

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 9-parameter, open-world, non-idempotent booking mutation with no output schema, the description covers requirements, exclusions, payment behavior, and the post-call outcome sequence. Nothing needed to call it correctly is left implicit.

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%, so the baseline is 3, and the description adds real semantics on top: email is needed because the confirmation is sent there, answers are keyed by question id from list_services, and address applies only when the service is at the customer's location. It slightly under-explains start/staff_id/notes beyond the schema, so not a 5.

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?

States a specific verb (send a booking REQUEST) and resource (one appointment on the customer's behalf), and explicitly frames it as a request rather than a confirmation. It names and contrasts with three siblings (get_availability, list_services, request_callback), so an agent can route without opening schemas.

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?

Gives explicit preconditions ('Use a start from get_availability'), sources for required inputs ('answers to any required questions from list_services (by question id)'), and a clear alternative rule ('If the customer will not share an email, use request_callback instead'). When-to-use and when-not-to-use are both spelled out.

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