Sync Calendar Items

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

The description goes well beyond annotations by detailing partial-update semantics (omitted fields keep current values), a default for project_id from config, success return value, and common HTTP error statuses (401, 403, 404). Annotations already indicate non-read-only and idempotent, but this adds concrete behavioral context.

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 single dense paragraph that front-loads the core purpose, then efficiently covers partial updates, defaulting behavior, return value, error handling, required parameters, and API reference. Every sentence conveys useful information with no redundancy.

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?

With no output schema, the description appropriately explains the success return value and error payloads. It includes endpoint and required parameters. However, the structure of the 'updates' array is still under-specified; an example or note about item identifiers would make it more 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% but the 'updates' parameter description is generic. The main description adds meaning by explaining that only changed fields should be sent and omitted fields persist, which clarifies what should go into the updates array. This compensates for the schema's generic 'items: {}'.

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 'Create or update a batch of Calendar Items,' which clearly specifies the verb, resource, and batch scope. This distinguishes it from sibling tools like create_calendar_item and update_calendar_item, which handle single items.

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 implies batch upsert usage and explicitly instructs to send only changed fields, which is valuable usage context. It does not explicitly name alternatives or exclusions, but the batch scope and partial-update guidance make the intended use clear.

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