Create a calendar appointment

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

With no annotations provided, the description carries the full burden of behavioral disclosure. It reveals error conditions (bare date on a timed event, end before start), special all-day semantics, and the result field end_day. It does not mention permissions or broader side effects, but it covers the most decision-relevant behaviors well.

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 a dense, well-ordered paragraph with no filler: purpose first, followed by date rules, error cases, multi-day behavior, and attendee sourcing. Every sentence adds essential information an agent needs before calling the tool.

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 annotations, no output schema, and seven parameters, the description covers the hardest input semantics, key error conditions, and one important returned field (end_day). It does not specify the full return shape or timezone handling, but an agent has enough to invoke the tool correctly for common cases.

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 description coverage is 0%, so the description must compensate. It thoroughly explains start, end, all_day, and attendees, which are the non-obvious parameters, but leaves subject, notes, and location to their self-evident names. This is strong compensation for the tricky parameters though not exhaustive for all seven.

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 states a specific verb and resource ('Create a calendar appointment') and then enriches it with concrete behavioral rules that distinguish creation from the update/delete/get siblings. The all-day, multi-day, and attendee semantics make the tool's purpose unmistakable.

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 clear context for when and how to use the tool, including date-format constraints, all-day event handling, and the explicit prerequisite to call family_members() for attendees. It does not explicitly name alternatives like update_appointment for modifications, but the create-vs-update distinction is strongly implied by the verb and sibling names.

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