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

No annotations are provided, so the description carries the full burden, and it discloses nothing beyond the operation itself: no return shape, no calendar/account scoping, no auth or permission requirements, no note on whether events from multiple calendars are merged. For a zero-annotation tool this is a notable gap.

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?

A single short sentence with the actionable scope front and center. The 'Run Google calendar action:' preamble is low-value boilerplate but costs little.

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 read-style listing with one optional param, no annotations and no output schema, the description is minimally viable but omits the return format and whether results are scoped to a single calendar, which an agent would need to interpret the result.

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% and there is a single optional 'detail' parameter documented as task-specific details. The description adds no meaning about how 'detail' is interpreted or what values are expected, so the baseline 3 applies.

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?

States a specific verb and resource with an explicit time scope ('check events today'), which lets an agent separate it from calendar__check_events_week by scope alone. The 'Run Google calendar action:' prefix is filler but does not obscure the purpose.

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 on when to use this versus calendar__check_events_week or the other calendar tools; the today-vs-week distinction is left entirely to inference from the name. No prerequisites or exclusions are stated.

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