calendar_respond_to_event

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

With no annotations present, the description carries the full burden of behavioral disclosure. It clearly states that the operation affects only the calling account's own participation status, cannot affect others, and does not create/move/delete events. This is substantive behavioral context beyond the input schema, though it stops short of describing response behavior or prerequisites.

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?

Two tightly written sentences, no filler, and the most important facts (what the tool does, the allowed responses) are front-loaded. The scope limitation is stated crisply.

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?

For a tool with no annotations and no output schema, the description covers the essential calling context: purpose, allowed values, limitation to the current account, and the 'not create/move/delete' guardrail. It is sufficient for an agent to decide when to use it, though it could perhaps note that eventId comes from calendar_list_events.

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 all five parameters are already described in the input schema. The description adds some context (for example, confirm the response values and framing the comment as a note to the organizer), but it does not materially extend the per-parameter semantic detail. Baseline 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 names a specific verb ('Answer a calendar invitation'), the resource (calendar event), and the possible outcomes (accept, decline, or tentatively), and it explicitly differentiates itself from create/move/delete actions. An agent can tell exactly what this does relative to siblings like calendar_create_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 clearly states when to use the tool—responding to an invitation—and what it cannot do (create, move, delete, or change others' answers). It does not name sibling tools explicitly as alternatives, but the exclusion language makes the intended use unambiguous.

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