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

With no annotations provided, the description fully carries the transparency burden and excels. It explicitly discloses that the hold is temporary, that nothing is paid, that tickets are not the user's until a human completes checkout, and that the hold expires on its own. It also states the limits (max 10 tickets/types) and the direct-sale-only constraint — far beyond a bare statement.

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?

Every sentence earns its place: purpose, key behavioral warning, limits, and cross-tool guidance. It's front-loaded with the main purpose, and the structured explanation is clear and compact without redundancy.

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?

Without an output schema, the description still tells the agent the return value is a checkout URL. It covers all critical aspects: what the tool does, when to use it, constraints, and the distinction from external ticketing. No major gaps for an agent to misuse 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 already documents event_slug and the tickets array. The description adds value by imposing a max of 10 tickets and 10 ticket types, and clarifying that tickets array describes what to hold. It doesn't add syntax details, but the constraint is useful beyond the 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?

The description opens with 'Hold tickets for an event sold through this site (Wix Events) and return a checkout URL' — a specific action on a specific resource for a specific return value. It explicitly disambiguates from siblings by noting only events sold directly by the site, and points out that for external ticket sellers (Sympla, Ingresse, Sesc), the event's own ticketUrl should be used instead.

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 provides explicit when-to-use and when-not-to-use guidance: use for events sold directly through this site; for events sold elsewhere, use the event's own ticketUrl. It also covers practical constraints like the max 10 tickets and 10 ticket types, and explains that this tool only creates a temporary hold, not a completed purchase.

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