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

With no annotations provided, the description fully carries the burden of disclosure. It explicitly states that the RSVP is not submitted until the confirmation link is clicked, that the link expires in 24 hours, that a confirmation email is sent to the provided address, and that the link is deliberately not returned to the caller. This is excellent transparency about side effects and limitations.

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 appropriately sized: four sentences, each serving a distinct purpose. The first sentence states the tool's purpose, the second explains the confirmation flow, the third tells the agent what to tell the user, and the fourth gives a critical safety instruction. No filler or repetition, and the structure is front-loaded with the most important 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 the tool's moderate complexity, the description covers everything an agent needs: the action, the asynchronous nature, the required user-facing instruction, and the constraint about using a real email. There is no output schema, but the description does not need to explain return values since the outcome is clear from the described flow. The description is complete for safe and correct invocation.

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?

The input schema already has 100% coverage with clear descriptions for all four parameters, so the baseline is 3. The description adds minimal new parameter-level meaning—it reinforces the email purpose but mostly repeats what the schema states. It does add an important instruction to use a real address, which relates to the email parameter but is more of an operational guideline than a semantic enhancement.

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: 'RSVP to a free event on this site (Wix Events).' This clearly distinguishes it from sibling tools like create_booking or reserve_event_tickets, which handle paid or ticketed events. The scope is precise and unambiguous.

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 implies the appropriate use case: RSVPing to free events on Wix Events. It also provides critical operational context, such as the need to inform the user to check their inbox and to use a real address. It does not explicitly name alternatives, but the context is clear enough to avoid confusion with related tools.

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