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

With no annotations, the description fully discloses the temporary nature of the hold, that no payment is made, that it expires on its own, and the maximum limits (10 tickets, 10 ticket types). Also specifies the tool only works for events sold directly.

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 a single paragraph that packs all necessary information. It is front-loaded with the main purpose and then adds constraints. While compact, it could be slightly more structured for readability, but it remains concise without redundant words.

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?

Given two parameters, no output schema, and no annotations, the description is thoroughly complete. It explains input sources, the outcome (checkout URL), key behaviors (temporary, not paid, expires), and limits. Also covers when not to use 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% with descriptions for both parameters. The description adds the constraint of max 10 tickets and 10 ticket types per reservation, which applies to the tickets array. It also references list_events for event_slug and get_event_tickets for ticketDefinitionId, adding context beyond schema.

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?

Clearly states the tool holds tickets for an event sold through Wix Events and returns a checkout URL. It also distinguishes from siblings by specifying it only works for events sold directly, and for external events, users should use the event's own ticketUrl.

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 tells when to use (for events sold through this site) and when not to (for events sold elsewhere). Also explains the temporary hold and that nothing is paid, guiding the agent to complete checkout via the URL.

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