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

The description communicates that this is a real booking, that a calendar invite goes to the user's email, and that the user must explicitly consent. These are meaningful side effects beyond the annotations' readOnly=false and idempotent=false flags. No contradiction with annotations.

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?

Two sentences, no filler. The first sentence states the action and target, the second details all necessary preconditions and a clear 'do not' warning. Every clause adds decision-relevant information.

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 covers prerequisites, side effects, and consent, which are the important details for a booking action. The only gap is unintuitiveness about what happens on success or failure (confirmation, invite link, error behavior) since no output schema exists, but this is not critical for correctly calling the tool.

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 schema fully explains all 5 parameters. The description repeats that the slot must come from get_availability and the email receives the invite, but those points are already in the schema. The description adds a minor emphasis on using the user's real name/email, which does not materially raise the score above the baseline.

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 real 30-minute Cuvo discovery call.' It immediately identifies the subject (the user) and ties the slot to the get_availability sibling, which makes the tool distinct from read-focused siblings.

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 gives conditional prerequisites: explicit confirmation of a specific slot from get_availability, and a real full name and email. It also tells the agent to never book without consent. It does not name an alternative such as request_callback, so the when-not/branching guidance is clear but not complete.

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