Update AddEvent RSVP Attendee

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

Beyond the annotations (non-read-only, non-destructive, idempotent), the description adds valuable behavioral details: partial updates preserve unspecified fields, returns the updated object as JSON, and returns a 404 error for missing attendee_id. No annotation contradiction exists.

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 well-structured with clear sections (Args, Returns, Examples, Error Handling) and a concise opening sentence. No superfluous content; each section earns its place.

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 4-parameter schema with full description and no output schema, the description covers the necessary return format and error behavior. The example and partial-update semantics make the tool fully understandable for an agent.

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% and each parameter is described, so baseline is 3. The description adds value by explicitly framing optional parameters as 'include only what's changing' and by providing an example mapping natural language to attendee_id and attending values (not-going).

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 it 'Updates an existing RSVP attendee' with a specific verb and resource. The title and content distinguish it from sibling tools like create_rsvp, delete_rsvp, and update_event.

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 explains the partial-update behavior ('Only the fields you provide are changed') and gives a concrete example. It does not explicitly state when to prefer this over alternatives, but the RSVP-specific scope is clear from context.

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