Get Free Slots

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

Beyond the readOnlyHint and non-destructive annotations, the description adds useful context: the HTTP method, the exact endpoint, and the required OAuth scope 'calendars.readonly'. This helps an agent understand auth expectations and that the operation is a safe read.

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 short and mostly to the point, but it opens with the redundant phrase 'Get Free Slots' immediately followed by 'Get free slots...'. The optional-filter sentence is also wordier than necessary, though the endpoint and scope are useful additions.

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 full schema documentation for all parameters, read-only annotations, and the endpoint and scopes included in the description, an agent has enough information to select and invoke the tool successfully. The lack of an output schema is mitigated by the simple nature of the operation.

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 100%, so all parameters are already documented. The description adds little beyond restating that timezone and user filters are optional, and it does not clarify the relationship between userId and userIds.

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 the tool gets free slots for a calendar within a date range, which is a specific verb and resource. It includes the REST endpoint and optional filters, making the purpose apparent, though it does not explicitly differentiate from sibling tools like calendars_get_blocked_slots.

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?

No guidance is given about when to use this tool versus alternatives such as calendars_get_blocked_slots or calendars_get_calendar_events. The description mentions optional timezone and user filters, but that is parameter information, not usage direction.

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