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

With no annotations provided, the description bears full responsibility for behavioral disclosure. It transparently explains that the hold is temporary, unpaid, requires human checkout via the URL, and expires. It does not cover authorization or error scenarios, but for a non-destructive operation this is adequate. Slight deduction for lack of failure behavior details.

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?

Three sentences, each earning its place: first sentence states purpose, second clarifies the temporary/unpaid nature, third gives limits and alternatives. No redundancy, front-loaded with key 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?

Given no output schema or annotations, the description provides sufficient context for a reservation tool: returns a checkout URL, explains the hold mechanism, and notes limitations. It lacks details on response format or error cases, but for a straightforward tool this is reasonably complete.

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 both parameters. The description adds context that event_slug comes from list_events and ticketDefinitionId from get_event_tickets, and mentions the overall limits (10 tickets/types). This adds marginal value beyond the schema, so a score of 3 is appropriate.

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 clearly states the tool's purpose: 'Hold tickets for an event sold through this site (Wix Events) and return a checkout URL.' It uses a specific verb ('Hold') and resource ('tickets for an event'), and distinguishes itself from sibling tools like create_booking or create_checkout by emphasizing the temporary, unpaid hold.

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 provides explicit when-to-use and when-not-to-use guidance: it works only for events sold directly through this site, and for external events users should use the event's own ticketUrl. It also states limits (max 10 tickets and 10 ticket types), helping the agent decide correctly.

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