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

With no annotations, the description bears the full behavioral burden. It usefully discloses the data source (connected Google calendars), the default date window, and key returned identifiers for downstream update/delete calls, but it does not clarify pagination, timezone handling, whether all connected calendars are included, or other read behavior details.

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 two tight sentences with no filler. Purpose, date format, default range, and returned identifier fields are all front-loaded and useful.

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 simple two-parameter read tool with no output schema or annotations, the description covers the essential invocation context and key return identifiers. It could be more complete about the full event payload and timezone behavior, but the core information needed to select and call the tool is present.

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 for both parameters. It does so by explaining that the two dates are YYYY-MM-DD formatted and that the default range is today through the next 7 days, though it omits explicit inclusivity and timezone semantics.

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 resource and scope: calendar events from the user's connected Google calendars between two dates. It also implicitly distinguishes this listing tool from mutation siblings by noting that returned ids/calendar_id/account_id are used for update_event and delete_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 gives clear usage context by defining the date range and its default window, so an agent knows when this tool applies. It does not explicitly name when to choose list_events over siblings like list_meetings or find_free_time, but the calendar-event scope is clear.

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