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

Annotations declare non-readonly, non-destructive, non-idempotent behavior. The description adds the meaningful traits: the action is short-lived, unlisted capabilities are refused, and this tool does not hold Xona time. It does not say what 'short-lived' means or whether repeated calls create duplicate actions, which matters given idempotentHint=false.

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: the first states the action and return value, the second the refusal rule and the sibling exclusion. No filler, and the primary behavior is front-loaded.

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?

With an output schema present, the description needn't explain the returned URL. It covers refusal and sibling routing, but omits that capabilities should be read from list_dental_practice_actions and what the action's lifetime or status entails (get_dental_action_status exists).

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 description coverage is 0% but the enum is self-explanatory. The description supplies the semantic frame: capability must come from the clinic's action options list, and one of the six values ('xona_email_appointment_request') is explained as a Xona request rather than a booking. practice_slug remains unexplained beyond its name.

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 and resource: creates a short-lived action for one capability from the clinic's action options and returns its URL. Distinguishes itself from hold_xona_booking_slot by name, though the title says 'Open one of a clinic's booking routes' and the description uses 'capability', which requires the agent to map terms.

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?

Explicitly says a capability the clinic does not list is refused, and directs connected-practice time holding to hold_xona_booking_slot instead. It does not mention list_dental_practice_actions as the prerequisite source of valid capabilities, leaving that to inference.

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